07/06/2025
How We Perform NDT on Welded Joints – Step-by-Step Guide
By Henob’s Engineering Services Limited.
When it comes to structural integrity, welded joints are one of the most critical areas to inspect.
At Henob’s Engineering Services Limited, we understand the risks associated with undetected weld defects, especially in the oil & gas, construction, and energy sectors.
That’s why we deploy Non-Destructive Testing (NDT) techniques to ensure safety, compliance, and longevity, without damaging the components we are inspecting.
Here’s a step-by-step look at how we perform NDT on welded joints:
1. Calibration of Equipment:
Before testing, we make sure our instruments are certified by accredited third-party organizations. This step ensures the accuracy and reliability of the test data.
2. Understanding the Job Scope:
Before diving into testing, we first assess the welded structure. This includes:
•.Reviewing engineering drawings and specifications
• Identifying applicable codes and standards (e.g., ASME, AWS, ISO)
• Understanding the material type and thickness
• Knowing the service condition (pressure, temperature, etc.
This helps us choose the most appropriate NDT method(s).
3. Surface Preparation:
Cleanliness is key. We remove slag, rust, paint, oil, and dirt from the weld area to ensure accurate testing. This may involve:
• Wire brushing
• Grinding
• Solvent cleaning
A clean surface ensures better visibility and reliable results.
4. Selecting NDT Method:
• Visual Testing (VT): The first line of defense. We examine the weld for visible cracks, undercuts, overlaps, etc
• Magnetic Particle Testing (MT): For detecting surface and near-surface defects in ferromagnetic materials.
👉 Depending on the material and defect type, we may also utilize other advanced NDT methods such as Ultrasonic Testing, Radiographic Testing, Liquid Penetrant Testing, etc.
5. Performing the Test:
With the right method and calibrated tools, our certified NDT technicians proceed with testing.
We magnetize the weld and apply magnetic particles to detect leakage fields.
↪️ Our technicians meticulously follow industry-specific procedures to ensure the integrity of the test.
6. Interpretation & Reporting:
After the test, we:
• Interpret the results using standards
• Document defect types, sizes, and locations
• Prepare a detailed inspection report with visual evidence
NOTE: If defects are found beyond the acceptable limits, we recommend corrective action before retesting.
7. Client Communication:
We don't just deliver a report; we partner with our clients, providing comprehensive walkthroughs of the findings, explaining any critical issues, and offering clear, actionable recommendations for repair or monitoring.
This collaborative approach empowers our clients to make informed decisions and maintain operational continuity.
Why Trust Henob’s?
✅ Certified and experienced inspectors
✅ State-of-the-art equipment
✅ Compliance with local and international standards
✅ Commitment to safety, quality, and integrity
At Henob’s Engineering Services Limited, we don’t just inspect, we help you build confidence in your operations.
Whether it’s for a pipeline, pressure vessel, structural steel, or storage tank, we ensure your welded joints are built to last.
Need NDT oil and gas services you can trust?
📞Contact us today or send us a message, we're ready to support your next project.
