2G Weld Test: What is It & How to do 2G Weld Test?

Making high-quality welds is not just being able to join two or more metals. Your weld product must be strong and protected from corrosion.

Therefore, welders use appropriate materials and equipment and apply different techniques to make their desired weld possible. Various welding methods are depending on the type of weld.

But, in this article, we will focus more on a welding technique that is not as common as the others. This is the 2G (groove) weld test that welders use to ensure that they are using the correct type of metals.

What is a 2G Weld Test?

A 2G weld test can recognize various types of metals that can be welded with steel. Welders use this in identifying what type of weld metal is being used in welding. This aims to know the type of weld metal to generate a seemingly sound weld. 

You need to use this test correctly because being able to determine whether you’re using the correct metal or not is important to make your welding plans successful.

It’s essential to use an appropriate type of metal in the welding process. When the choice of metal goes wrong, it will not be compatible with welding as it is very prone to corrosion. Therefore, it will be impossible to produce a high-quality weld.

How Does the 2G Weld Test Work?

How Does the 2G Weld Test Work

In conducting the 2G weld test, you will be able to determine what composes the weld metal you’re using. With this, you can easily tell if it is ideal to be used in welding.

You need to choose metals that are compatible with your welding plans so there will be no problems as you continue the welding process. 

This type of weld test consists of four stages. In each stage, different types of metals are determined to know if they should be excluded or not. 

Stage 1

The first stage includes the visual inspection of the metal.

This is where the inspector will assess by sight if the metals used are having even little signs of corrosion, and under these circumstances, a pass rating will be given.

Stage 2

In this stage, alloys that are likely to corrode will be tested and rated depending on the results. The testing of the metal will no longer be able to proceed to the next stage if the inspector proves that it’s corroded.

How to Pass the 2G Weld Test

Stage 3

The third stage is another visual inspection test that aims to identify which metals should not be included in the welding process.

It will be given a pass rating if the inspector doesn’t see any present signs of corrosion in the metal.

Stage 4

The fourth and last stage is important because some metals can not be recognized visually. To identify those, this stage makes use of an X-ray machine.

How to Pass the 2G Weld Test?

which Metal is Not Suitable for Welding

There will be no problems in passing the 2G weld test as long as the metals you’re using pass all the qualifications in all the stages.

If the test reveals that there are metals that are not suitable for welding, then the rest of the weld will fail and will be given a fail rating. 

How to Know if a Metal is Not Suitable for Welding?

Your metals for welding won’t pass the 2G weld test if it contains contaminants like dust, rust, dirt, or grease.

Even if it’s just on one side of the metal and is not determined visually, it will still fail the test.

Moreover, it must not possess any chemicals. Therefore, anything that signifies corrosion will automatically lead to getting a fail rating. 


The 2G weld test may not ensure that the whole welding process will be successful but this is a great help for welders to not start wrongly by using inappropriate types of metals.

Making this kind of mistake at the beginning will affect the next stages of the welding process, which will be time-consuming. 

Hence, failure to identify that you’re using an incorrect type of metal will result in a failed weld.

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