Why do I have cracks in the parent material?

Cracks appearing in the parent material around the weld nugget can be caused by several issues. They are:

High Weld Force – can fracture the parent material with excessive forging action.
Insufficient Cooling – Over heating can cause excessive stresses from expansion and contraction along with the forging action.
Metallurgy of Material Welded – Some materials become brittle at the temperatures experienced in resistance welding.

Other factors that could cause fractures are small electrode face areas and short hold times.

A sketch of surface cracks is illistrated in AWS D8.1 Figure 2 shown here:


 Surface Cracks AWS 8.1

Have a Question?

Do you have a question that is not covered in our knowledgebase? Do you have questions regarding the above article? Click here to ask the professor.

Did you find this answer helpful?