How to check whether the joint is good after welding with the multifunctional copper wire butt welding machine?

Copper wire, aluminum wire, iron wire and steel wire are used in multi-functionCopper wire butt welding machineAfter welding, there are many ways to check whether the joint is good or not. Joints of different grades and materials have different quality inspection standards. These quality standards include joint strength standards, workpiece size requirements, the size and number of internal and external defects in the joint, the number of allowed repairs, and other special performance requirements.