The role of current during projection welding with medium frequency spot welding machine

Medium frequency spot welding machines generally require less current than single point current for bump welding of workpieces of the same material and thickness. But you must ensure that the current setting can melt the bumps before the bumps are completely crushed. That is to say, excess metal spatter will not be squeezed out before the bump welding is completed. For bumps of a fixed size, the overflow metal increases as the current increases. Using an amplitude modulated spot welding machine control box can reduce the overflow metal as the current increases in Jiangsu and Zhejiang. Like time and pressure, material and metal properties are also the basis for selecting welding current.

The required welding current for multi-point projection welding is the single bump current multiplied by the number of bumps. However, the required welding current must be adjusted accordingly according to changes in the material of the metal being welded and the shape of the bumps. The thermal balance of the plate should also be considered during projection welding to prevent the bumps from being crushed before the plate reaches the welding temperature, making it impossible to weld. When welding metal materials of the same material, the bumps should be set on thicker workpieces.

When welding dissimilar metals, bumps are generally set on workpieces with higher electrical conductivity. This is similar to the spot welding function of a spot welding machine. However, if it is difficult to set bumps on the thick plate side, bumps can also be set on the thin plate side. In order to reduce the impact of thermal balance, electrode materials of different materials can also be used.

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