We divided the spot welding machine spot welding process often shunt phenomenon into four categories: poor insulation of the secondary circuit and the body of the welding, the distance between the center of adjacent welding joints, the thickness of the welded parts and the number of welded parts.
1. Welding secondary circuit and the body insulation is not good to produce shunt.
The secondary line of the spot welding transformer is insulated from the body. If the disassembly and maintenance is not timely, poor insulation or broken, it will produce shunts, and in serious cases can not be welded.
2. Adjacent welding point center distance spot welding shunt impact.
The smaller the distance between two adjacent solder joints, the smaller the resistance of the shunt path through the part, the greater the shunt. Therefore, spot welding should be based on the process requirements and a reasonable choice of point distance to reduce the impact of shunting.
3. The influence of the thickness of the solder on the shunt.
As the thickness of the solder increases, the more serious shunt. This is because the increase in the thickness of the solder increases the shunt path through the metal conductive cross-sectional area, reducing the resistance of the shunt path, so the shunt is very large.
4. The influence of the number of welders on the shunt.
Spot welding process, spot welding two-layer plate, adjacent to the shunt of the weld point is less than spot welding three-layer plate, because the increase in the number of pieces of solder is equivalent to the increase in the thickness of the solder.
In addition, the welding sequence of the solder joint, the surface condition of the solder part, and the electrode pressure all affect the shunt of spot welding. In short, there are many shunting factors, and the impact on spot welding is different. Among them, the shunt caused by the secondary circuit joint has a greater impact on the quality of spot welding, and should be checked frequently to avoid shunting.