What are the bumps on the workpiece welded by the medium frequency spot welder?

There are two types of bump shapes on the workpiece welded by the medium frequency spot welding machine: spherical and conical. The latter can improve the stiffness of the bumps and prevent premature collapse when the electrode pressure is high; it can also reduce splashing caused by excessive current density.

But usually spherical bumps are used. In order to prevent extruded metal from remaining around the bumps and forming gaps between the plates, bumps with annular overflow grooves are sometimes used. During multi-point projection welding, inconsistent bump heights will cause an imbalance in the current at each point, making the joint strength unstable. Therefore, the bump height error should not exceed ±0.12mm. If preheating current is used, the error can increase.

The bumps can also be made into long shapes (approximately elliptical) to increase the size of the nugget and improve the strength of the solder joint. At this time, the bumps and the flat plate will be in line contact. During projection welding, in addition to using the above-mentioned forms of bumps to form joints, there are also a variety of joint forms depending on the type of projection welding workpiece.

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