Visual Testing (VT) — NDT Inspection
Visual Testing for Weld Profile, Surface Defects & Industrial Quality Control
Systematic, code-compliant visual inspection of welds, fabricated structures, pressure equipment and in-service plant — using the naked eye, optical aids and precision measuring tools. The essential first step in every NDT programme.
- Direct & Remote Visual Inspection
- Certified Level II Inspectors
- Photo-Documented Reports
- AWS · ASME · EN ISO 17637
- Same-Day Report Dispatch
Service Overview
What Visual Testing Identifies
Visual Testing (VT) is the oldest and most widely used NDT method. When conducted systematically by a trained inspector, VT detects a broad range of surface-level and dimensional deviations that affect component integrity, serviceability and code compliance.
Surface Discontinuities
Cracks, laps, seams, cold shuts and tears that break the surface — identified under direct observation or with illuminated magnifiers, mirrors and borescopes.
Weld Profile & Geometry
Undercut depth, excess reinforcement height, weld width, overlap and root condition — measured with calibrated weld gauges against AWS D1.1, ASME IX and IS 822 acceptance criteria.
Corrosion & Pitting
General, localised and pitting corrosion on plant, pipework and structural steel — visually classified and photographically documented for condition monitoring records.
Misalignment & Distortion
Joint mismatch (hi-lo), angular and linear misalignment of weld preparations, bow and twist in fabricated assemblies — verified against dimensional tolerances.
Defect Detection
Surface Defects & Discontinuities VT Can Find
A skilled VT inspector detects far more than is visible to an untrained eye. Here are the specific discontinuities our inspectors examine and classify per applicable code.
Weld Undercut
Groove melted into parent metal alongside the weld toe. Measured with a weld gauge; must not exceed 0.5–1.0 mm per most structural codes. A stress raiser that reduces fatigue life.
Excess Weld Reinforcement
Weld metal above the base plate surface that exceeds code limits. Creates stress concentration at the weld toe and may indicate incorrect welding parameters.
Porosity & Surface Pores
Gas pockets breaking the weld surface — indicate shielding gas problems, moisture contamination or incorrect welding consumables. Classified as individual or clustered.
Cracks (Surface-Breaking)
Longitudinal, transverse, crater, toe and root cracks visible at the surface — always rejectable under all structural and pressure codes. Immediately flagged for further investigation.
Arc Strikes & Spatter
Stray arc marks outside the weld zone create local hardening and potential crack initiation points. Spatter causes mechanical damage and corrosion initiation. Both are recorded and assessed.
Incomplete Fusion (Surface)
Lack of fusion between weld passes or between weld and parent metal that is visible at the weld surface. Indicates insufficient heat input or incorrect technique.
Tools & Techniques
Visual Inspection Equipment We Use
VT is not just naked-eye observation. Our inspectors use a range of calibrated optical and measuring tools to make VT a precise, repeatable and documented discipline.
| Tool / Technique | Used For | Typical Application | Type |
|---|---|---|---|
| Direct Visual Inspection | Open surface examination within 600 mm & 45° | Welds, plate surfaces, fabrications | Standard |
| Weld Profile Gauges | Measure undercut, reinforcement, weld toe angle, hi-lo | Butt & fillet weld acceptance per AWS / ASME | Standard |
| Illuminated Magnifier (×5–×10) | Fine surface crack detection, porosity sizing | Critical welds, precision machined parts | Optical aid |
| Borescope / Videoscope | Inaccessible internal surfaces — bores, pipes, vessels | Pipe internals, vessel nozzles, heat exchangers | Remote VT |
| Mirrors & Dental Probes | Blind access areas, back-side of welds | Tight-access structural connections | Optical aid |
| Digital Photography | Permanent photo record of findings | All inspections — referenced in report | Documentation |
| Tape / Depth Gauge | Dimensional checks, corrosion area sizing | In-service plant condition surveys | Standard |
Applications
Where Visual Testing Is Applied
VT is used at every stage — from incoming material checks to pre-weld fit-up, inter-pass, post-weld and in-service inspection. It is the mandatory first step before all other NDT methods.
Structural Steel Fabrication
Pre-weld fit-up inspection, inter-pass weld quality checks and final post-weld visual examination of beams, columns, trusses and connections per AWS D1.1 and IS 9595.
Pressure Vessels & Boilers
Mandatory VT of all welds per ASME Section VIII and IBR requirements — including pre-weld joint preparation, in-process and final inspection before hydro test.
Pipeline & Piping Systems
Visual inspection of pipe butt welds, socket welds, fillet welds and flange faces per ASME B31.1/B31.3 for power and process piping systems.
Machined Components & Castings
Incoming inspection of castings, forgings and machined parts for surface defects, tool marks, cold shuts and dimensional deviations before further processing.
In-Service Plant & Shutdown Inspection
Periodic visual condition survey of in-service vessels, columns, heat exchangers, structural steel and pipework — identifying corrosion, erosion, mechanical damage and repair needs.
Coating & Surface Condition Assessment
Visual assessment of painting, galvanising, thermal spray and other protective coatings for adhesion, blistering, cracking and holiday defects before and after application.
Our Process
How Our Visual Inspection Is Conducted
Every VT assignment follows a structured inspection procedure — ensuring nothing is missed, all findings are captured and the final report is clear and actionable.
Review & Planning
Inspection procedure is reviewed against the applicable code (AWS, ASME, EN ISO 17637). Scope, acceptance criteria, lighting requirements and access points are confirmed before mobilisation.
Surface & Access Preparation
Component surface is cleaned of loose scale, spatter, oil and contaminants in the inspection zone. Access, lighting (minimum 500 lux per ASME V) and viewing angle are set up.
Systematic Examination
Inspector performs a methodical visual scan with optical aids and weld gauges. Each weld joint, surface zone or component face is examined. All indications are photographed and marked.
Reporting & Acceptance
A photo-referenced inspection report is issued — listing location, indication type, dimensions, applicable acceptance criterion and pass/fail status. Available within 24 hours of inspection.
Codes & Standards
Visual Testing Standards We Work To
Our VT inspections are conducted per internationally recognised standards, accepted by clients, IBR, QCI, third-party inspection agencies and statutory authorities.
Visual testing of fusion-welded joints — the primary international VT standard for welded components
Visual examination requirements for pressure vessels and piping under ASME Boiler & Pressure Vessel Code
Structural Welding Code — Steel; visual inspection acceptance criteria for structural weld profiles
Indian Standard — Code of practice for inspection of welds; visual inspection requirements and acceptance
Process Piping — visual examination of piping welds and pipe components during fabrication and installation
Piping inspection code — in-service inspection, visual condition assessment of process piping systems
Pressure vessel inspection code — in-service inspection and visual condition monitoring
Inspector qualification and certification — our VT inspectors are Level II qualified per ASNT guidelines
Industries Served
Sectors That Rely on Visual Testing
VT is mandated by code across virtually every industry that welds, fabricates or operates pressurised equipment. Jagdamba Technology serves clients across Maharashtra and pan-India.
Why Jagdamba Technology
Why Clients Choose Us for VT Inspection
ASNT Level II Certified Inspectors
All our VT inspectors hold ASNT SNT-TC-1A Level II qualification. Certification records are available on request — accepted by all major third-party agencies.
Photo-Referenced Reports
Every indication is photographed with a reference scale and pin-pointed on a weld map or sketch. Reports are clear enough to stand alone without a verbal explanation.
Fast Turnaround
Inspection reports issued within 24 hours — or same-day for priority jobs. No waiting a week to know if your fabrication has passed. Your schedule stays on track.
Calibrated Weld Gauges
All weld profile gauges and measuring tools are calibrated and traceable. VT is made quantitative — not just subjective opinion — with documented measurement records.
Integrated NDT Support
VT is just the starting point. Where surface defects need confirmation, or subsurface inspection is required, we immediately deploy MPT, DPT or UT from the same team — no recoordination delay.
Code-Specific Expertise
Different codes have different acceptance criteria. Our inspectors know AWS D1.1, ASME Section VIII, B31.3 and IS 822 — and apply the correct criteria for your project without prompting.
FAQ
Frequently Asked Questions — Visual Testing
Common questions from fabricators, maintenance teams and project managers about VT inspection.
What is Visual Testing (VT) in NDT?
What is the difference between direct and remote visual testing?
What lighting level is required for visual inspection of welds?
Which standard is used for weld visual inspection acceptance criteria?
Is visual testing sufficient on its own, or do I need additional NDT?
How quickly can you mobilise for visual inspection in Pune?
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