Following the deformation and wear of the electrode tip, the area of the spot welding head will increase, and the strength of the solder joint will be lost. In order to ensure the size of the nugget and the strength of the solder joint, the welding time and welding current can be mutually compensated within a certain range. In order to obtain a certain strength of the solder joints, high current and short time （strong premise, also called hard specification）can be used, or small current and long time（weak premise, also called soft specification）. The choice of hard specifications for spot welding heads or soft specification depends on the function, thickness of the metal and the power of the welding machine used. There is an upper limit for the current and time required to withstand the metal of incompatible function and thickness, and the duration shall prevail.

Method of spot welding When the spot welding head is not strong or the wire is brought up, the main point should be the spot welding head, not the higher parameters. When spot welding, be careful not to use too much force to grind, just use a grinding disc or W5 use fine sandpaper to lightly grind the bottom of the spot welding head for couple of times. Don’t throw the spot welding head often The center of the spot welding head is insulating glue. Tightening the spot welding head and then loosening it will affect the touch position of the two spot welding heads, resulting in poor welding performance. Therefore, it is strongly recommended that the spot welding head is installed and used until it cannot be used. Just take it out, do not often disassemble the spot welding head in the middle. The clamping part of the spot welding head clamp should be clean Due to the large current used in welding, the reason why large parameters are often required is because there are a lot of dirt where the spot welding head clamp clamps the spot welding head, which seriously affects the flow of current. Therefore, it is recommended to clean the area once a month. To line up correctly Defective products are generally caused by inaccurate alignment. One is that the line must pass through the two ends of the bottom end of the spot welding head, and the other is that there is an error when looking at it, and the line must be pressed at the bottom end of the spot welding head. The center position, but it appears to e where the wire is pressed behind the spot welding head.