The capacitor discharge spot welder is a new type of welding equipment. When the capacitor discharge spot welder welds, if there is no quality problem in the welded joint, there will be no defect in the appearance and core. However, if the welds are not cleaned properly during the welding process and the standards are not selected properly, it will cause defects. The main defects of the capacitor discharge spot welder are:The welded joints are not melted through and spatter during welding. These two defects are more common and should be paid special attention in actual use.
No lentil-like casting spot weld organization is formed during spot welding. This defect is the most dangerous. It will greatly reduce the strength of the welded joint. And this defect is usually not detectable from the appearance. The main reason for not melting is insufficient heating of the weld area due to low welding current density or short welding time. There are many reasons for reduced current in the weld area.
Spatter occurs in spot welding. A little spatter is unavoidable, and if the spatter is too large, it can lead to too deep indentations. Too deep indentations on the working surface can lead to a significant reduction in the strength of the weld core. There are two types of spatter, the initial spatter and the final spatter. The initial spatter is produced at the moment when the current is turned off. The main cause is too short pressure time or unclean weld surface with little pressure. The final spatter is generated at the end of the power source and is mainly caused by too much welding current or too long welding time where the nucleus molten metal is too large for the plastic ring around it to wrap under the electrode pressure, resulting in liquid metal spillage.