There are many other factors to take into consideration, such as the materials being used, the desired outcome when creating the weld, and much more! Let’s explore some of these different kinds of tests in-depth.

Magnetic Particle Testing (MPT)

The most commonly known type of weld test is the Magnetic Particle Test. This method uses a substance that is easily affected by the presence of magnetism to detect any defects in the material, such as cracks or lack of fusion. The areas where defects are present will look black under magnification when this substance is applied to the surface. When properly done, it should appear clean and clear of any defects.

One way this weld test can be completed is by using ferromagnetic powder or magnetite (which contains iron) particles in a liquid suspension, typically oil or kerosene. This mixture is generally applied over the weld with an artist brush. The particles can be attracted to the defect and stick, making it easier to see through a microscope after the test is complete. Another method is using a permanent magnet with adhesive tape or film in place on its surface. In this case, the test would be done by placing the magnetic surface over the weld, then flipping it over and examining both sides of the surface of the workpiece.

To start your welding career, you will need three things:

1) A certification from a nationally recognized program,

2) Proficiency with the equipment you will be using and

3) A position in a company that needs welders. Unfortunately, there is no set path for becoming a certified welder so the best thing to do is research!

For a better idea of what each certification entails, look here.

You have your certification but you don’t know how to use the equipment so all you can do is wait for a company to call you. Not a bad plan but it tends to be a haphazard approach to landing that first job as a welder. Fortunately, there are several good options for getting the experience you need to become a certified welder.

Work as an intern or apprentice with a reputable company to get on-the-job training, complete certificate programs at local community colleges, take online welding courses through educational non-profits like Lynda.com and edX.org, volunteer your time at a local welding training center, or attend a school that specializes in teaching welding techniques.

Learn more from https://en.wikipedia.org/wiki/Welder_certification