I. causes and types of welding deformation causes of welding deformation: welding deformation refers to the deformation of weldments during and after welding. During welding, the molten metal and the base metal near the seam expand and produce plastic deformation. During solidification, the weld and the metal near the seam contract. This is the longitudinal stress and the transverse stress. Make the weld longitudinal and transverse shrinkage, so that the weldment deformation. Because the heat e

Difference: the workpiece processed by grinding machine is rough, and the surface finish of workpiece processed by polishing machine is better, but high finish can be achieved by installing precise grinding wheel on grinding machine. Grinding machine: electric grinder reciprocating electric polishing grinder (also known as file mill). It is widely used in the fine machining and surface polishing of the mold profession. It is a substitute for similar pneumatic products. The main outstanding featu