How does the pressure change during projection welding with a medium frequency spot welder?

When the medium frequency spot welder performs projection welding, the welding pressure is very critical. It is required that the pneumatic part has good follow-up performance and the pneumatic can deliver pressure stably. The electrode force of projection welding should be enough to completely crush the projection welding point when it reaches the welding temperature and make the two workpieces closely fit.

Therefore, the size of the electrode force must be determined based on the properties of the metal to be welded, the size of the bumps and the number of bumps formed at one time. The size of the electrode force affects heat dissipation and heat dissipation. When other parameters remain unchanged, excessive electrode force will crush the bumps prematurely and cause loss of energy.

The inherent role of bumps. At the same time, the strength of the joint will be reduced due to the reduction of current density; if the pressure is too small, it will cause serious splashing. In addition to the appropriate size of the electrode force, the speed of the electrode pressure should also be appropriate, and it needs to be smooth and smooth to determine the size of the welding current. As the welding current increases, the nugget size and joint strength increase, as well as secondary circuit impedance and other factors.

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