NDT For Welding

NDT For Welding

Non-destructive testing (NDT) is a wide group of analysis techniques used in science and technology industry to evaluate the properties of a material, component or system without causing damage. The terms nondestructive examination (NDE), nondestructive inspection (NDI), and nondestructive evaluation (NDE) are also commonly used to describe this technology. Because NDT does not permanently alter the article being inspected, it is a highly valuable technique that can save both money and time in product evaluation, troubleshooting, and research. The six most frequently used NDT methods are Radiographic Testing, Ultrasonic Testing, Magnetic Particle Testing, Penetrant Testing, Vacuum Testing & Visual Testing.

BOMES’s qualified and experienced field services team is dedicated to perform the highest level of quality service in the non-destructive testing industry.

  • Radiographic Testing (RT)
  • Ultrasonic Testing (UT)
  • Magnetic Particle Testing (MT)
  • Penetrant Testing (PT)
  • Vacuum Testing and Leak Testing
  • Hardness Testing

Radiographic Testing (RT)

RT uses Electromagnetic Radiation (X-Ray, Gamma) that creates an image of the inside of a surface. Common indications found are voids, inclusions, cracks, internal corrosion, stress corrosion cracking, and defective welds.


A radiograph is the permanent record of the internal condition of a weld or material used for quality inspection purposes. The same discontinuities can be radiographed again after a period of service life and the radiographs can be compared to measure the change in the size and shape of the discontinuity.
Radiographic Testing can be produced a direct image of flaws and applicable to metals, non-metals and composites.

Ultrasonic Testing (UT)

Ultrasonic Testing (UT) uses high-frequency sound waves that travel through the material to create a signal or image showing the internal structure of the material.
The sound wave can be reflected by cracks, Lack of fusions, lack of penetration, porosities, slags and other surface defects or shape of the surface. This portable equipment needs only one side access for the inspector.


The simplest form of UT is thickness measurement also known as UT thickness gauging where the thickness of material can be measured to evaluate the remaining life of a pipe or tank.

Magnetic Particle Testing (MT)

Magnetic Particle Testing (MT) is used to detect discontinuities in ferromagnetic material such as iron, nickel, cobalt and the alloys. Magnetic particles are applied to the test piece and a discontinuity that causes a disruption in the induced magnetic field attracts the applied particles, then producing an indication.


Important is a highly effective inspection tool that is sensitive to the presence of cracks, laps, seams and similar types of surface and near-surface discontinuities.
Depending on the type and orientation of discontinuities, test parts should be examined in two orthogonal (perpendicular) directions because discontinuities must have a major dimensions perpendicular to the magnetic field lines of force in order to be detected.

Penetrant Testing (PT)

Penetrant Testing (PT) is one of the oldest methods of finding indications in parts which are not visible by eye.
This method utilizes a visible or fluorescent dye solution which penetrates into open surface discontinuities via capillary action. The excess dye must be removed completely from the surface.


A developer which bleed out the trapped penetrant and the inspector might found the discontinuities easily.
With the correct application, it will detect discontinuities ranging in size from the large to the microscopic.

Vacuum Testing and Leak Testing

The vacuum box technique of bubble leak testing is to locate leaks in a pressure boundary that cannot be directly pressurized. This is accomplished by applying a solution to a local area of the pressure boundary surface and creating a differential pressure across that local area of the boundary causing the formation of bubbles as leakage gas passes through the solution.

A leak is a flow of gas (or liquid) through the wall of a vessel (via an imperfection such as a hole, crack or bad seal). Leaks require a pressure difference to generate the flow; they always flow from higher pressure to lower pressure.

Hardness Testing