How to control the welding pressure of energy storage welding machines?

How to control the welding pressure of energy storage welding machines?

Spot welding refers to the welding method of using cylindrical electrodes to form a welding point between the contact surfaces of two overlapping workpieces during welding. When spot welding, first apply pressure to make the workpiece in close contact, then connect the current, and under the action of resistance heat, the contact area of the workpiece melts. After cooling, it forms a welding point. Spot welding is mainly used for welding stamping parts of thin plate components with a thickness of less than 4mm, especially suitable for welding car bodies, carriages, and aircraft fuselage. But containers with sealing requirements cannot be welded.

Features:

(1) During spot welding, the heating time for the connection area is very short and the welding speed is fast.

(2) Spot welding only consumes electrical energy and does not require filling materials, flux, gas, etc.

(3) The quality of spot welding is mainly guaranteed by spot welding machines. Simple operation, high degree of mechanization and automation, and high productivity.

(4) Low labor intensity and good working conditions.

(5) Due to the fact that welding electrification is completed in a very short period of time, requiring high current and pressure, the program control of the process is more complex, the welding machine has a large capacitance, and the equipment price is higher.

(6) It is difficult to perform non-destructive testing on solder joints.

The energy released by the energy storage welding machine in an instant is very huge, so the discharge time cannot be adjusted. Among the three adjustable and controllable elements, only pressure and current are available. Therefore, in this situation, the control of welding pressure is particularly crucial.

The downward pressure speed of the cylinder of the energy storage welding machine should not be too fast. Due to inertia factors, if the downward pressure speed is too fast, it will cause significant impact on the solder joint, not only causing deformation, but even directly crushing the solder joint. Therefore, it is important to emphasize that slow pressure is the most reasonable way to first compress the components and then wait for discharge.

The discharge time of an energy storage welding machine is instantaneous. Therefore, if the lower part of the welding point does not have enough time to heat up and soften, coupled with insufficient pressure, it will directly affect the quality of welding, and the gap between the two workpieces will become larger. Therefore, in discharge welding, we should emphasize the welding pressure, and appropriately amplify it is a reasonable choice.

When the cylinder of the energy storage welding machine rebounds, in order to emphasize the efficiency of welding, we need to adjust a suitable pressure to quickly rebound.

Equipment application: spot welding and nut projection welding of high-strength steel and hot-formed steel in the automotive manufacturing industry, as well as spot welding and multi-point projection welding of ordinary low-carbon steel plates, stainless steel plates, galvanized plates, aluminum plates, and wire rods, as well as resistance brazing and spot welding of copper wires in the high and low voltage electrical industry, brazing of silver dots and copper plates, composite silver spot welding, etc

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