Non-Destructive Testing (NDT) Inspection & Consulting

As a CWB certified company, we offer state of the art
welding inspection services all across Ontario and Quebec since 2007

Inspection Services

Inspection services are the backbone of our company. Our inspection services include:
Other related codes and standards offered but not limited to:
Our services extend to auditing, consulting and NDT training. Training welders to pass their CWB exams is also possible.

How can we help you?

We serve clients throughout various industries as listed below




Railway Transportation

Road Vehicles


Building Structures

Industrial Structures

Ships & Marine Structures

Offshore Structures


Storage Tanks

An approach to testing involves evaluating a structure without damaging the welding and its surroundings. It may involve different techniques of inspection and testing for a given Welding Procedure Qualification. Welding procedures are usually submitted to the CWB by every welding company that wishes to do CWB certified welding.
Welding Procedures are the guidelines of performing a weld and are usually categorized into two:
Procedure Qualification Records are the documented results of all inspections and tests obtained from the actual test samples.
Welding Procedure Specifications are the documented work instructions used by the welder for the conduction of the weld.
Non Destructive Testing (NDT) is the most widely used method for the analysis and evaluation of the welding. The weld is tested by analyzing the cracks, pores, discontinuities in the structure and surface roughness to ensure the quality and strength of the weld. All of this is done without damaging the structure and its components.
At APAP Inspection Inc., we offer NDT services and solutions.

Non-Destructive Testing (NDT) Methods:

1. Visual Inspection – VT:

It is the most popular, simplest, cheapest, and most widely used NDT technique. It is done using the naked eye and by the use of 10x magnifying glass to detect surface flaws such as cracks, porosity, and unfilled craters leading to repairs or rejection of the work.

Procedures adopted by Inspector:

It is divided into three categories:

1. Details to check Before welding:

2. Details to check During welding:

3. Details to check After welding:

2. Liquid Penetrant Testing – LT:

This method is used to check nonporous materials for defects open to the surface.

Liquids used:


It is divided into five steps:
The procedure conforms to ASTM E 165.

3. Magnetic Particle Testing – MT:

It is the process in which the part to be inspected is magnetized by passing through a low-voltage or passing a magnetic field. Electrical poles at the end of the crack are charged. Fine magnetic particles are applied to the surface, their concentration on the respective pole will indicate flaw.
The procedure conforms to ASTM E 138, ASTM E 709, MIL-I-6868.

4. Radiographic Testing – RT:

In this testing procedure, a radioisotope, e.g., Cobalt-60, is put in an X-ray tube, emits radiations, which are thrown on the film under the surface to be inspected. The beams pass through the cracks of the surface on the film. The film, when developed, locates the internal flaws of the surface.
The procedure conforms to ASTM E 94, ASTM E 142, and AWS D1.1.

5. Ultrasonic Testing – UT:

This technique locates both internal and surface flaws. It uses an ultrasonic transducer of 0.1 – 15.0 MHz range frequency and angle of the beam of 60 degrees.
The ultrasonic transducer sends a beam that enters the specimen and is reflected the transducer; when an interface is encountered, it locates a flaw.
The procedure conforms to ASTM E 164 and AWS D1.1.

6. Eddy Current Testing – ET:

It uses Electromagnetic induction to detect flaws in conductive materials. A circular coil is placed near the specimen, and an eddy current is produced, which produces a magnetic field. Variations in magnetic field Detect flaws.
The procedure conforms to ASTM E 94, ASTM E 142, and AWS D1.1.

7. Coating Inspection – CIP:

This method involves the testing of liquid and dry coatings on ferrous and non-ferrous substrates.


The procedure for coating inspection can vary depending on the industry but the most common factors when inspecting are the following;

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Let us take care of all your inspection needs. We employ some of the industry’s finest NDT inspectors. 

Throughout the years of my career, the best inspectors I met were amazing welders” -Amarpal

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