Relieving method of welding stress in medium frequency spot welder

At present, the failure methods of stress elimination used in the intermediate frequency spot welding machine are vibration aging (eliminating 30% to 50% of stress), thermal aging (eliminating 40% to 70% of stress) Hawker energy PT aging (eliminating 80% to 100% of stress).

Vibration aging treatment is a commonly used method to eliminate the internal residual stress of engineering materials. Through vibration, the residual internal stress of the workpiece and the vector of additional vibration stress exceed the yield strength of the material, so that the material has a small amount of plastic deformation, so that the internal stress of the material can be relaxed and reduced.

Thermal aging is to heat the workpiece to the elastoplastic transition temperature, and maintain for a certain time, so that the residual stress of the workpiece is relaxed, and then very slowly reduce the temperature, so that the workpiece is in a low stress state after cooling.

The production time shows that if the process parameters are improperly selected in the process of heating, insulation and cooling, or the operation is not strictly followed by reasonable process specifications, the result of stress relief is often not obtained, and even the stress of the workpiece is increased. At present, the failure methods used to eliminate stress are vibration aging (eliminate 30%~50% of stress), thermal aging (eliminate 40%~70% of stress) Hawker energy PT aging (eliminate 80%~100% of stress).

Vibration aging treatment is a commonly used method to eliminate the internal residual stress of engineering materials. Through vibration, the residual internal stress of the workpiece and the vector of additional vibration stress exceed the yield strength of the material, so that the material has a small amount of plastic deformation, so that the internal stress of the material can be relaxed and reduced.

Thermal aging is to heat the workpiece to the elastoplastic transition temperature, and maintain for a certain time, so that the residual stress of the workpiece is relaxed, and then very slowly reduce the temperature, so that the workpiece is in a low stress state after cooling.

The production time shows that if the process parameters are improperly selected in the process of heating, insulation and cooling, or the operation is not strictly followed by reasonable process specifications, the result of stress relief is often not obtained, and even the stress of the workpiece is increased.