Tag Industrial Inspection

Discover how the Metal-Chek Supermagna Yoke HMM6, SBW 333/O and 104 Contrast combination ensures faster, more accurate and safer magnetic particle inspections, in compliance with technical standards.

Why reliable inspection is vital in industry

In industry, reliability means economy and safety . After all, an unidentified surface discontinuity can compromise the operation of critical equipment, generate rework, unscheduled downtime, and even accidents.
Therefore , the application of Non-Destructive Testing (END) techniques is indispensable. Among the available methods, magnetic particle inspection (MPI) stands out for its high sensitivity to ferromagnetic materials.

However, simply having good equipment is not enough: it is also essential to have the right magnetic particles and an efficient contrast agent to guarantee consistent results.
This is precisely where Metal-Chek’s proposal comes in: the combination of the Supermagna Yoke HMM6, the SBW 333/O and the Contrast Agent 104. Together, these products form a complete system that ensures fast, accurate and safe inspections.

Supermagna Yoke HMM6: Power and Robustness in the Field

The Supermagna Yoke HMM6 is a portable electromagnetic device designed to generate the magnetic field (AC – Alternating Current) necessary for magnetic particle inspection using the yoke technique.
Furthermore, its robust construction makes it ideal for both field and factory use.

Main features:

• Portable and robust – ideal for field and factory inspections.
• With no current conduction through the part – magnetization is achieved by an magnetic field, ensuring greater safety.
• Applications – welding, metal structures, castings and forgings.
• Regulatory – complies with the main national and international standards. 

SBW 333/O: Visible Magnetic Particles in Oily Suspension

Magnetic particles are responsible for making visible the discontinuities present in the magnetized part.

SBW 333/O is an oil-based suspension for visible wet manifolds, formulated to offer high sensitivity and stability.

This ensures clear and consistent indications during the inspection process.

Highlights:

• Ready to use.
• Excellent visualization of discontinuities in finished products.
• High definition of indications under visible light, with excellent sensitivity.

Contrast 104: Enhanced Visibility

Contrast 104 creates a white background that enhances the indications of visible magnetic particles, ensuring maximum definition and reliability in inspection.

In other words, it improves the readability of the information and contributes to a more accurate interpretation.

Main functions:

• It increases the contrast between the particles and the surface.
• Increased sensitivity of the assay.
• Compliance with technical standards.

How the Supermagna Yoke HMM6 + SBW 333/O + Contrast 104 Combination Works

In a simple and efficient way, the process occurs in four stages:

1. Application of Contrast 104 – uniform white background on the area to be inspected.
2. Magnetization with the Supermagna Yoke HMM6 – generation of a magnetic field on the workpiece.
3. Application of SBW 333/O – visible oily suspension deposited on the magnetized surface.
4. Interpretation of results – particles accumulate in field escape regions, immediately revealing surface discontinuities.

Advantages of the Metal-Chek Combination

• High sensitivity – greater accuracy in detecting surface discontinuities.
• Operational speed – visible indicators at the time of inspection.
• Versatile application – sectors such as oil & gas, energy, metallurgy, automotive, naval and nuclear.

Furthermore, this combination reduces rework and increases the efficiency of inspection teams.

Technical Reference Standards

The combination of Supermagna Yoke HMM6 + SBW 333/O + Contrast 104 meets the requirements of international and national standards, such as:

• ASTM E709
• ASTM E3024
• ISO 9934 (1 and 2)
• NM 342
• ASME BPVC Section V, Article 7
• PETROBRAS N-1598

Why choose Metal-Chek?

Metal-Chek is a national leader in Non-Destructive Testing solutions , with products developed according to rigorous quality standards and tested in real industrial applications.

Therefore, by adopting the Supermagna Yoke HMM6 + SBW 333/O + Contrast 104 combination, your company gains in:

• Reliability of results.
• Speed ​​in execution and interpretation.
• Safety and operational efficiency.

Magnetic particle inspection is a well-established method among Non-Destructive Testing and remains essential for ensuring the integrity of metallic components and structures. Its effectiveness, however, depends directly on the quality of the equipment and products.

With the combination of the Supermagna Yoke HMM6, the SBW 333/O and the 104 Contrast, Metal-Chek delivers a complete solution for performing Non-Destructive Testing.

In this way, the inspection gains in reliability, speed, and operational safety.
This integration ensures:
• Reliability and accuracy in the results.
• Speed ​​in the execution and interpretation of the indications.
• Safety and efficiency in industrial operations.

If your company’s goal is to raise inspection standards and strengthen process reliability, count on Metal-Chek.

Metal-Chek – a leader in solutions for Non-Destructive Testing.

Speak with our experts and get your questions answered.

Follow our news at: @metalchek

THE POWER OF COMBINATION

Discover how the combination of Supermagna Yoke HMM6, magnetic powder particles, BC 502 SN Conditioner and 104C Contrast ensures fast, compliant and safe magnetic particle inspections.

In industrial maintenance, the reliability of inspections is crucial to avoid rework, equipment failures, and costs associated with unscheduled downtime.

Among Non-Destructive Testing (END) methods, magnetic particle inspection (MPI) is one of the most widespread techniques for detecting surface and subsurface discontinuities in ferromagnetic materials .

For reliable results, good magnetization equipment alone is not enough. High-quality magnetic particles, a suitable conditioner, and an effective contrast agent are also necessary.

This is where Metal-Chek stands out, offering a robust combination for the industry: the Supermagna Yoke HMM6, magnetic powder particles associated with the BC 502SN Conditioner and the 104C Contrast.

Supermagna Yoke HMM6: Robustness and Compliance

The Supermagna Yoke HMM6 is an electromagnetic yoke designed to generate the necessary magnetic field during inspection.

Main features:

• Portable and robust – ideal for field and factory inspections.
• Safe – it does not conduct current through the part, but induces a longitudinal magnetic field.
• Versatile – suitable for inspecting welds, castings, forgings, metal structures, etc.

Regulatory – complies with the main national and international standards.

Magnetic Particles + BC 502 SN Conditioner

The use of magnetic powder particles, combined with BC 502 SN Conditioner, is the most widely adopted method for forming stable and efficient suspensions.

Function of magnetic particles:

• They make surface and subsurface discontinuities visible by accumulating in regions where the applied magnetic field escapes.
• The concentration can be adjusted according to the procedure.
• Available in different options for visible or fluorescent inspections.

Function of BC 502 SN Conditioner:

• It guarantees corrosion protection .
• Allows for uniform dispersion of particles .
• It promotes proper moisturization and mobility  on the surface.
• Compliant with technical standards requirements.

104C Contrast: Enhanced Visibility and Precision

Contrast 104C is applied before magnetization and magnetic particle bathing, creating a uniform white background.

Main functions:

• It increases the contrast between the particles and the surface.
• Increased sensitivity of the assay.
• Compliance with technical standards.

How the Combination Works

1. Applying Contrast 104C – creates a contrasting and uniform white background.
2. Magnetization with the Supermagna Yoke HMM6 – generates the necessary magnetic field.
3. Application of the prepared suspension (particles + BC 502 SN) – the particles agglomerate in the leakage field regions, forming indications.
4. Interpretation – with a white background and highlighted particles, the inspector can quickly and reliably identify discontinuities.

Advantages of the Combination

• High sensitivity in detecting discontinuities.
• Operational speed , with results visible immediately.
• Regulatory reliability , in accordance with ASTM, ISO, AMS, ASME and PETROBRAS standards.
• Flexibility , allowing adjustments to particle concentration.
• Safety is ensured through the use of a robust and secure yoke in various environments.

Technical Standards Supporting the Set

The combination meets the requirements of international and national standards, such as:

• ASTM E709
• ASTM E3024
• ISO 9934 (1 and 2)
• NM 342
• ASME BPVC Section V, Article 7
• PETROBRAS N-1598

Magnetic particle inspection is an essential technique for industrial maintenance and quality assurance. However, its efficiency depends on choosing the right equipment and supplies.

The combination of the Supermagna Yoke HMM6, magnetic particles with BC 502 SN Conditioner, and 104C Contrast ensures a fast, reliable, and safe inspection process.

With this complete solution, Metal-Chek reinforces its commitment to providing cutting-edge technology for Non-Destructive Testing, meeting the needs of the industry with excellence.

Speak with our  technical team  and discover how we can help transform your inspection routines into competitive advantages. 

Follow us on Instagram: @metalchek

In modern industry, the reliability of equipment and metal structures is a decisive factor for operational safety and cost reduction. A failure in a critical component can generate not only financial losses, but also put lives at risk. It is in this scenario that Non-Destructive Testing (END) plays a strategic role, as it allows the integrity of parts to be evaluated without causing damage.

Among the most widely used END methods, magnetic particle testing (MPT) stands out for its efficiency in detecting surface discontinuities in ferromagnetic materials . Within this method, one piece of equipment proves indispensable: the Supermagna Yoke HMM6 .

The Supermagna Yoke HMM6 is a portable device that has become an essential tool for industrial inspectors and maintenance technicians. Throughout this article, we will explore in detail what the Supermagna Yoke HMM6 is, how it works, its applications, regulatory requirements, and, most importantly, why it is fundamental to ensuring quality and safety in industrial inspections.

What is the Supermagna Yoke HMM6?

The Supermagna Yoke HMM6 is an inverted “U”-shaped electromagnet with two legs (fixed or articulated) that, when placed on a ferromagnetic surface, generates a longitudinal magnetic field between its poles. This field allows for the detection of surface flaws by applying magnetic particles to the inspected area.

Unlike other techniques, the Supermagna Yoke HMM6 does not conduct electrical current through the workpiece, but rather through the coil of the equipment itself. This characteristic offers two major advantages:

1. Safety: It can be used in potentially explosive or flammable atmospheres, as there is no risk of electrical sparks.
2. Preservation of the part: there is no risk of overheating or surface damage during the test.

Furthermore, the Supermagna Yoke HMM6 is designed to be both portable and rugged, making it ideal for field inspections, hard-to-reach locations, and situations where inspector mobility is critical.

Magnetic Fundamentals Applied to the Supermagnetic Yoke HMM6

To understand the importance of the Supermagna Yoke HMM6, it is necessary to revisit some basic concepts of magnetism:

• Magnetic field: the region around a magnet or conductor carrying an electric current where magnetic forces act.
• Leakage field: interruption in magnetic flux lines caused by a discontinuity, such as a crack or inclusion.
• Magnetic particles : dry powder or liquid suspension that, when applied to a magnetized surface, accumulates in the leakage field, visually revealing the fault.

The Supermagna Yoke HMM6, by magnetizing the part, highlights these discontinuities immediately.

Applications of the Supermagna Yoke HMM6 in Industry

The Supermagna Yoke HMM6 is widely used in sectors where structural safety and operational reliability are essential.

• Welding and boilermaking: inspection of weld beads, detection of cracks and lack of fusion.
• Petrochemical and oil & gas: pressure vessels, piping, flanges and critical connections.
• Automotive and rail sectors: axles, wheels, gears, rails, and braking systems.
• Aeronautical and aerospace: inspection of landing gear and structural components.
• Energy: hydraulic turbines, components for thermal and nuclear power plants.

In all these sectors, the Supermagna Yoke HMM6 stands out for its speed of application and immediate results, allowing for quick decisions regarding repairs or replacements.

Reference Standards

• ASTM E1444  – Standard practice for magnetic particle testing.
• ASTM E709  – Standard guide for magnetic particle testing.
• ASTM E3024 –  Guidelines covering equipment calibration, magnetization techniques, acceptance criteria, and personnel training.
• PETROBRAS N-1598 –  Establishes mandatory technical requirements and instructions on how to handle non-conformities for Non-Destructive Testing: Magnetic Particles.
• ASME Section V – Article 7 – Requirements for magnetic particle testing of ferromagnetic materials, applicable to pressure vessels, boilers, and other components covered by the ASME code.

Why is the Supermagna Yoke HMM6 Essential in Industrial Maintenance?

Because it goes far beyond just an inspection tool — it’s a strategic investment in safety, productivity, and compliance.

• Minimizes unscheduled downtime → detects faults before they escalate into breakdowns.
• Reduces costs → avoids rework and unnecessary replacements.
• Increased security → protects people and property.
• Mobility and practicality → ideal for teams that need agility in the field.
• Robustness and durability → ideal for intensive use in industrial environments.

The impact on your company

The Supermagna Yoke HMM6 for magnetic particle testing is a key component in industrial maintenance, combining simplicity, efficiency, and regulatory compliance. Its application in different sectors reinforces its relevance as an indispensable piece of equipment in inspection programs.

By choosing the Metal-Chek Supermagna Yoke HMM6, your company is guaranteed reliable results, expert technical support, and advantageous commercial terms.

Speak with our technical team and discover how the Supermagna Yoke HMM6 can increase the safety and efficiency of your inspections.

Follow us on Instagram: @metalchek

In industrial maintenance, the efficiency of a solvent goes far beyond cleaning. E-59 is a clear example: developed as an aliphatic solvent, it plays a strategic role in both non-destructive testing (END) and heavy-duty cleaning of industrial components, especially in environments where lubricating oil is a constant challenge.

E-59 in Non-Destructive Testing

In inspection and quality control processes, choosing the correct solvent directly impacts the effectiveness of the tests. E-59 is widely used as part of the surface preparation steps in liquid penetrant testing, ensuring that parts and components are properly cleaned and free of contaminants before the method is applied. This results in greater accuracy in detecting discontinuities.

Applications in Oil Cleaning and Lubrication

Beyond its use in inspection applications, the E-59 is recognized for its high efficiency in removing lubricating oil from engine blocks, mechanical parts, and impregnated surfaces. This versatility makes the product an ally in sectors that deal with high levels of oil contamination, such as engine rebuilding shops, heavy maintenance, and railway industries.

Use in Grinding Shops and the Railway Sector

Engine rebuilding companies use E-59 for the precise cleaning of engines and components, ensuring that the reassembly process occurs under ideal conditions. In the railway sector, especially in locomotive manufacturing companies, the product stands out for its ability to remove oil residue from large and complex parts, where cleanliness is critical for the reliability and durability of the equipment.

Advantages of the E-59

• High performance aliphatic solvent.
• Ideal for surface preparation in non-destructive testing.
• Excellent removal of lubricating oil and grease.
• Widely used in engine rebuilding shops and locomotive companies.
• Versatility: suitable for industrial maintenance, inspection, and heavy-duty cleaning.

E-59 is not just a solvent. It represents a practical and reliable solution for sectors that demand deep cleaning and precision in non-destructive testing. Whether in engines, industrial parts, or large railway systems, its application guarantees efficiency, safety, and reliability in day-to-day maintenance.

Want to learn more about the E-59 and its applications? Talk to our team !

Read also: High-Quality Industrial Inspections Begin with a Clean Surface

Follow us on Instagram: @metalchek

A practical guide for purchasers and supply engineers.

In industry, Non-Destructive Testing (END) is fundamental to ensuring the quality, safety, and conformity of parts and equipment. However, many Requests for Quotations (RFQs) fail because they do not correctly specify what is being requested—whether it is the  contracting of END services  or the  acquisition of supplies and equipment  to perform it.

Below, we present a practical guide to preparing clear and complete RFQs, with real-world examples from Metal-Chek and Supermagna products.

1. Define what you are buying: a service or a supply.

First of all, determine if your RFQ will be for:

• END service  – the supplier performs the test and delivers the technical report.
• Materials/supplies/equipment for END  – your team or service provider will use the purchased products to perform the test.

This distinction avoids confusion and ensures that the specifications are suitable for what you want to buy.

2. Specifying the contracting of the END service

When hiring a service, describe how the test should be conducted and what acceptance criteria will be adopted.

a) Method and technique

Specify the method and technique:

• Example: Liquid penetrant testing, Type I, Method A, Level 2, using  Metal-Chek FP 91
• Example: Dry magnetic particle extraction, white powder, using  Supermagna WD 55

b) Reference standard

Define the applicable standard (ASTM E165, ASTM E709, ASME Section V, AWS D1.1 or internal standards such as Petrobras N-1596/N-1598).

c) Acceptance criteria

Determine codes and levels (e.g., ASME VIII Div.1, EN 1369, Level 2 or 3).

d) Inspector qualifications

Require SNQC/ABENDI or ASNT SNT-TC-1A certification, Level II or III, depending on the method.

e) Implementation conditions

Include requirements such as cleanliness, adequate lighting (lux or µW/cm²), temperature, humidity, and application times.

f) Documentation and traceability

Request reports with photos, sketches, and part identification, ensuring traceability by batch or serial number.

3. Specifying the purchase of materials and equipment for END

When purchasing supplies or equipment, the RFQ (Request for Quotation) should contain technical details of the product.

a) Penetrant Liquids

• Fluorescent: Metal-Chek FP 91 , Type I, Method A, Level 2
• Visible: Metal-Chek VP 30 , Type II, Method A
• Visible: Metal-Chek VP 31 , Type II, Method C

b) Developers

• Dry:  Metal-Chek D72 , form a
• Non-aqueous:  Metal-Chek D70 , form d, e
• Aqueous:  Metal-Chek D76 , form b

c) Removers / Cleaners

• Solvent: Metal-Chek E 59 , Class 2
• Solvent: Metal-Chek R 501 , Class 1

d) Magnetic Particles

• White dry track: Supermagna WD 55
• Yellow dry track: Supermagna YD 404
• Fluorescent wet process: Supermagna LY 2000
• Visible red wet path: Supermagna RW 222
• Visible black wet sample: Supermagna BW 333

e) Equipment

• Yokes:  Supermagna Yoke HMM6

4. Best practices for any END RFQ

• Be specific: avoid generic terms like “LP test” without specifying the method, type, and standard.
• Standardize the descriptions across all requests.
• Approve the technical proposal before the price.
• Include safety and environmental requirements (PPE, proper disposal of products).

Conclusion

A clear specification — whether for contracting END services or acquiring Metal-Chek and Supermagna supplies — ensures that the process is executed with quality, reduces risks, and avoids rework.

Want to learn more?  Read also: How to choose the ideal penetrant type for each application.

Speak to our technical team.

Follow us on Instagram: @metalchek

In penetrant testing, choosing the correct product is crucial for the  sensitivity, reliability, and compatibility of the test. Specifying an inappropriate penetrant can lead to incomplete detection of discontinuities, material damage, or even unnecessary rejections.

This guide will help you understand which factors to consider  and how to select the most suitable penetrant for your application, with real-world examples from the Metal-Chek line.

1. Begin by understanding the classification of penetrants.

Penetrant liquids are classified primarily by  type, removal method, and sensitivity level.

a) Type

• Type I – Fluorescent.
  High sensitivity, inspection under UV light. Ideal for detecting very fine discontinuities.
  Ex.:  Metal-Chek FP 91 , Type I, Method A, Level 2.
• Type II – Visible.
  Indications visible to the naked eye under white light. Simpler and faster, ideal for field inspections.
  Ex.:  Metal-Chek VP 30 , Type II, Method A;  Metal-Chek VP 31 , Type II, Method C.

b) Removal method

• A – Washable with water  (easy removal with water)
• B – Lipophilic post-emulsifiable  (emulsifier applied after the penetrant)
• C – Solvent removable  (removal with cloth and solvent, such as  Metal-Chek E 59  or  Metal-Chek R 501 )
• D – Hydrophilic post-emulsifiable  (water-based emulsifier)

c) Sensitivity level (Type I)

It ranges from Level 1 (low sensitivity) to Level 4 (ultra-high). The more critical the component, the higher the recommended level.

2. Consider the material to be inspected.

• Stainless steels, titanium, and special alloys : require penetrants with low halogen and sulfur content, and compatible developers.
  Ex.:  Metal-Chek FP 91  with contaminant certification according to ASTM E165.
• Carbon steel and ferrous materials : greater flexibility of choice, depending on the acceptance criteria.
• Porous materials : require care to avoid excessive penetration and false readings.

3. Inspection environment and conditions

• Environments with low, controlled lighting : fluorescent (Type I) is preferable.
• Field inspection or areas with restricted UV lighting : opt for visible (Type II).
• Locations without running water : consider method C (removable solvent) for cleaning up excess water.

4. Compliance with standards and criteria

Always align the penetrant and developer with the required standard:

• ASTM E165, ISO 3452, ASME Section V, Petrobras N-1596.
  And include in the RFQ the requirement for a batch certificate and SDS (Safety Data Sheet).

5. Combining penetrant, developer, and remover

For an effective test, choose a compatible set:

• Metal-Chek FP 91  (fluorescent) +  Metal-Chek D70  (non-aqueous developer) +  Metal-Chek E 59  (solvent remover).
• Metal-Chek VP 30  (visible) +  Metal-Chek D72  (dry developer) +  Metal-Chek R 501  (solvent remover).

Conclusion

Choosing the right penetrant is not just a matter of preference — it’s a guarantee of reliable results and compliance with technical standards.
Metal-Chek offers solutions for different sensitivity levels, methods, and types, always accompanied by technical certification and specialized support.

Contact the Metal-Chek technical team.

Follow us on Instagram: @metalchek

Read also:

The Main Methods of Industrial Inspection and How to Choose the Ideal One

How to Choose the Ideal Penetrant Testing Process for Your Application?

Do you know what makes a penetrating liquid effective?

Industrial leaks are not just an operational headache. They can compromise a plant’s safety, productivity, and environmental compliance. Therefore, early leak detection is an essential practice for any modern industry, especially in contexts like Industry 4.0, where continuous monitoring and predictive maintenance are key to efficiency.

In this article, we will explore one of the main methods for detecting industrial leaks, focusing on non-destructive techniques based on the use of fluorescent additives and UV flashlights. The goal is to provide a comprehensive, technical, and accessible overview for professionals working in industrial maintenance, inspection, and sectors where operational reliability is non-negotiable.

Why is accurate leak detection vital?

Before we delve into the method, it’s worth reiterating: leaks can cause significant damage. We’re talking about:

• Loss of industrial fluids (oil, gas, water, compressed air, refrigerant, among others);
• Increased operating costs;
• Risks of fire or contamination;
• Damage to equipment and structures;
• Production interruptions;
• Legal and environmental non-conformities.

In a scenario where predictive maintenance is increasingly integrated into industrial strategies, the use of non-destructive testing (END) to identify and correct leaks has become a competitive differentiator.

The technology of fluorescent additives

Detection with fluorescent dyes is one of the safest, simplest, and most effective techniques for identifying leaks. The fluorescent additive works effectively in any closed circulatory system where liquids are used for lubrication, hydraulics, cooling control, and fuel systems.

The method involves adding a fluorescent additive — usually a colored liquid miscible with the system fluid (such as oil, water, fuel, or coolant) — which concentrates at the leak points. When exposed to ultraviolet (UV) light, this additive emits intense fluorescence, making even the smallest leaks visible.

How the method works:

1. Fluorescent dye is added to the system to be inspected (pipes, tanks, heat exchangers, radiators, hydraulic systems, etc.).
2. After a period of operation, the system is inspected with a UV flashlight .
3. Leaks are visually identified as bright spots, usually in shades of green or yellow.

Advantages:

• Non-destructive method;
• Affordable cost;
• Quick and visual detection;
• Excellent for small leaks;
• Compatible with various types of fluids.

Typical applications:

• Industrial and automotive refrigeration systems;
• Oil pipelines;
• Plumbing installations;
• Reservoirs;
• Air conditioning equipment (HVAC/R).
• Fuel lines;

The role of UV flashlights

UV flashlights are indispensable tools in this process. Their main function is to emit ultraviolet radiation, in the 365nm range, to excite the fluorescent molecules of the additive, making the leak visible to the naked eye.

Characteristics of UV flashlights:

• Laptops;
• Battery powered;
• IP certification;
• Specific power and wavelength for greater visual contrast;
• Long range;

Good practices in leak inspection

• Use certified additives that are compatible with the system fluid;
• Follow the manufacturer’s instructions regarding concentration and circulation time;
• Use UV flashlights with the appropriate wavelength;
• Document the identified leak points with photos and technical reports.

Safety and environment

The choice of method should always consider environmental and health impacts. High-quality fluorescent additives have NSF and OEM Grade certification, but their disposal must comply with local environmental regulations. The use of UV flashlights must also follow safety standards, avoiding prolonged direct exposure to radiation.

Conclusion: technology combined with intelligent maintenance

Leak detection using fluorescent additives and UV flashlights represents an efficient, affordable, and visually powerful solution for maintaining the integrity of industrial systems.

If your company operates in the industrial and commercial sectors, industrial maintenance, inspection, and welding, incorporating these practices can represent significant cost savings, in addition to ensuring compliance, safety, and performance.

Want to know which fluorescent additives and UV luminaires are ideal for your type of application? Talk to the Metal -Chek technical team — a national specialist in solutions for Non-Destructive Testing .

Contact us: (11) 3515-5287

Follow us on Instagram: @metalchek

Every effective inspection begins with observation — not just what the eyes see, but what a technical and experienced eye is able to interpret. Visual Inspection (VI) is the initial step in identifying discontinuities , defects, wear, and anomalies that can compromise the integrity and performance of equipment.

More than just a superficial check, VT acts as an initial filter in quality control, directly contributing to cost reduction, risk prevention, and increased operational efficiency.

Furthermore, visual inspection serves as the gateway to more advanced non-destructive testing techniques, such as penetrant testing, magnetic particle testing, and ultrasound. In other words, when a visual indicator is detected, it’s the right time to deepen the analysis with complementary and more sensitive methods.

Although it seems simple, visual inspection requires much more than just “looking”:

• Technical training
• Knowledge of acceptance criteria
• Adequate lighting
• Support tools and instrumentation
• Evidence documentation

Visual Inspection in the Industry 4.0 Era

Those who think that Visual Inspection (VI) has lost importance with the advancement of automation are mistaken. On the contrary — it has evolved and integrated with new technological resources, expanding its reach, precision, and speed.

Today, VT is an active part of Industry 4.0 and can be combined with state-of-the-art digital solutions:

• Artificial intelligence for image recognition.
• Drones for inspections at heights or in hazardous areas.
• 4K cameras with thermal sensors
• Predictive analytics connected to digital dashboards

Most common applications of visual inspection.

Visual Inspection (VI) is widely used in various industrial sectors as a quick and effective assessment tool. Its main objective is to identify visible irregularities that may compromise the structural integrity, functionality, or safety of components and equipment.

The following table summarizes the main applications and what is sought to be identified in each case:

Equipment and Resources Used in Visual Inspection

Although many visual inspections are done with the naked eye, the use of auxiliary equipment significantly enhances the accuracy and reliability of the test. Some resources used include:

 Adequate natural or artificial light: Ensures adequate visibility. Poor lighting can compromise the detection of discontinuities.

Magnifying glasses and magnifying lenses: They amplify small details, allowing the identification of surface cracks, porosity, inclusions, or lack of fusion in welds.

Borescopes and industrial endoscopes: Optical instruments used for inspecting hard-to-reach areas, such as pipes, internal welds of pressure vessels, and aeronautical components.

Rulers, gauges and jigs: Tools for measuring dimensions, weld angles, weld bead profiles and alignments.

High-resolution cameras: They facilitate photographic documentation and historical comparison during periodic inspections.

Digital inspection and recording software: With the advancement of Industry 4.0, integrating visual inspections with digital systems allows for recording occurrences, generating reports, and maintaining traceability in accordance with regulatory requirements.

Tip:
In low-light environments, the use of adequate artificial light is not optional — it’s mandatory.

Best practices in performing visual inspections.

To ensure the effectiveness of visual inspection and the reliability of results, it is essential to adopt well-defined operational practices. Standardizing execution through written procedures and operational checklists helps minimize human error and ensure consistency in assessments. A simplified model is presented below that can be adapted to the needs of each sector:

BEFORE INSPECTION:

• Check that the surface is clean (free of contaminants such as paint, oil, grease, rust, dust, or debris).
• Check the ambient lighting (it should be sufficiently intense and evenly distributed, allowing for an accurate assessment of the surface. It is important to avoid reflections, shadows, or glare, especially on polished materials or those with irregular geometry. In locations with little natural light, the use of adjustable and directional artificial light sources is recommended to ensure good visibility).
• Assess the inspector’s physical and visual condition (e.g., fatigue, use of glasses).
• Assess the need for additional equipment and resources.

DURING THE INSPECTION:

• Observe surface continuity: deformations, cracks, oxidation.
• Check weld beads: profile, spatter, lack of fusion.
• Use magnifying glasses on areas with suspicion or small details.
• Photographing and documenting irregularities
• Assess the need for additional tests (liquid penetrant, magnetic particles, etc.).

AFTER INSPECTION:

• Record keeping and traceability (maintaining a history of inspections, photos, reports, inspection maps, and checklists with acceptance criteria. These records ensure traceability, effective audits, and support decision-making).
• Storing records digitally ensures traceability and facilitates audits.

Integration of Visual Inspection with Other END Methods

Visual Inspection (VI) is the starting point for most Non-Destructive Testing (END). While it can identify various surface flaws, it does not always provide sufficient information for a complete assessment of the component’s integrity. Therefore, it is essential to integrate it with complementary methods, especially when there are visual suspicions that require technical confirmation.

The table below shows how VT connects to the main END methods and the benefits of this combination:

Normative References

Visual inspection is governed by several technical standards that ensure standardized procedures, reliable results, and compliance with legal and industrial requirements. Below, we highlight some applicable technical standards:

• ISO 17637 – Visual Inspection of Welds in Metallic Materials: establishes requirements for performing visual inspection of welds, including acceptance criteria and recommended techniques.
• NBR 14842 – Visual Inspection of Welds: national procedures and requirements that guide the practice of visual inspection of welds.
• ASME Section V, Article 9 – Requirements for Visual Inspection: a standard widely used in the pressure equipment and boiler making industry.
• Petrobras Technical Standards (Examples: N-1596, N-1598, N-2370) – Specific guidelines for visual inspections in the oil and gas sector.

The First Line of Defense for Quality

Visual inspection is much more than just a keen eye—it’s an essential technical barrier against failures that compromise safety, productivity, and regulatory compliance.

Implementing a well-structured visual inspection program is the first step towards operational excellence. Furthermore, when combined with Metal-Chek methods such as Liquid Penetrant, Magnetic Particle, and Leak Detection, visual inspection transforms into an ecosystem of industrial reliability.

Next Steps for Your Company

To strengthen your visual inspection program and increase the reliability of your processes, consider:

✅ Assess the maturity of your visual inspection program.

✅ Empower your team with training based on recognized standards.

✅ Standardize checklists and procedures with specialized technical support.

✅ Invest in quality accessories and equipment to complement the visual stage.

If your company wants to increase process reliability and ensure technical compliance, Metal-Chek is your ideal partner.

Speak with our technical team and discover how we can help transform your inspection routines into competitive advantages. 

Follow us on Instagram: @metalchek

Contact us at: (11) 3515-5287

Industrial inspection plays a fundamental role in ensuring product quality, operational safety, and the efficiency of production processes. Choosing the ideal inspection method for your process can significantly impact the reduction of defects and cost optimization. Among the available methods, Non-Destructive Testing (END) stands out for allowing precise evaluations without compromising the integrity of materials and structures.

Non-Destructive Testing: Characteristics and Applications

Non-destructive testing offers a comprehensive analysis of materials, components, and industrial systems, using physical and chemical principles to detect discontinuities and defects. Among the main methods, we can highlight:

Penetrant Liquids

Liquid penetrant testing is widely used for detecting cracks and surface discontinuities in metallic and ceramic materials. The process involves applying a highly capillary liquid to the material’s surface, followed by the removal of excess liquid and the application of a developer, which makes existing flaws visible. It is an easy and low-cost method, particularly suitable for inspecting cast, welded, and machined parts.

Ultrasound

Ultrasonic inspection  uses high-frequency sound waves to assess the structural integrity of materials. The waves are emitted by a transducer and propagate through the material, being reflected by possible internal discontinuities. Analysis of the generated echoes allows the identification of flaws such as cracks, inclusions, and delaminations. This method is widely used in the petrochemical, aeronautical, and infrastructure industries, ensuring accurate and reliable diagnoses.

Magnetic Particles

This method is suitable for ferromagnetic materials and consists of applying a magnetic field to the part, along with fine particles of iron oxide. If discontinuities exist, the magnetic flux will be interrupted, concentrating the particles at the site of the defect and allowing its visualization. This type of inspection is common in the automotive and metallurgical industries, being efficient in identifying surface and subsurface cracks and discontinuities.

Industrial Radiography

Industrial radiography is based on the differential absorption of X-rays or gamma rays as they pass through the inspected material. Areas with defects, such as cracks or inclusions, show variations in absorption, which are captured on a film or digital detector, allowing for detailed analysis of the component’s internal structure. This method is widely used in the inspection of welds, piping, and pressure equipment, where structural integrity and safety are crucial.

Acoustic Emission

Acoustic emission inspection detects structural flaws based on sound waves generated by the material under mechanical stress. Small internal displacements cause acoustic emissions captured by sensors, allowing the identification of degradation processes before they become critical. This method is used in the energy, infrastructure, and oil industries, enabling continuous and predictive monitoring.

Applications in Different Industrial Sectors

The choice of the appropriate inspection method varies according to the specific needs of the industrial sector; we will mention the sectors below.

• Aerospace –  Verification of surface cracks in fuselages and wings. Inspection of composites and critical parts. Monitoring of structural fatigue in ground tests.
• Automotive –  Quality control of cast and forged parts. Verification of cracks in structural components and engines. Inspection of welds on car bodies and chassis.
• Oil and Gas –  Inspection of welds on pipelines and pressure vessels. Verification of cracks and corrosion in transport lines. Continuous monitoring of offshore structures.
• Civil Construction –  Verification of weld integrity in metal structures. Evaluation of internal corrosion in concrete reinforcement. Thickness and wear control in metal components.
• Shipbuilding Industry –  Inspection of welds on hulls and tanks. Detection of cracks in metal structures. Evaluation of plate thickness and corrosion.

Benefits of Inspection in Reducing Failures and Costs

Implementing an efficient inspection system brings numerous benefits to companies, including:

• Failure prevention : Early identification of defects prevents accidents, reduces costs associated with emergency repairs, and increases operational reliability.
• Cost optimization : Periodic inspection enables strategic planning of preventive maintenance, reducing expenses related to unexpected downtime.
• Quality improvement : Ensures compliance with technical standards, reinforcing the company’s safety and competitiveness.

Industrial inspection plays a strategic role in maintaining the quality and safety of production processes. Choosing the right method depends on the material characteristics, the application, and the specific needs of the company. Investing in technology and professional training in non-destructive testing is essential to ensure efficiency, reduce costs, and optimize industrial operations. Count on Metal-Chek to achieve maximum safety and effectiveness in your inspection processes.