The vertical core problem is caused by the thickness difference between the upper and lower workpieces or the material difference is too large, and the difference between the upper and lower resistance, thermal conductivity and deformation of the workpieces to be welded is too large. There are also welding core porosity accompanied by welding bias phenomenon.

After using different models and specifications of Agera spot welder test, we can improve from the following points:

1, the equipment itself: equipment body, electrode strength increase, reduce the external deformation of welding;

2, welding parameter allocation: parameters according to different workpieces, welding pressure, welding time, welding current to combine and adjust, reduce the generation of bias;

3, welding electrode material: the upper and lower electrodes can be used to use different materials, so that the heat generated between the upper and lower electrodes and the workpiece is biased, so as to achieve the balance of the welding fusion point to prevent the problem of bias.

With the application of high-power energy storage welding machines and the promotion of metal film capacitors, the projection welding of high-strength steel plates has been greatly developed, and it has also got rid of the original backward process of arc welding after projection welding.

Medium frequency inverter DC spot welding machine is the first choice for aluminum alloy welding because of its three-phase balance, DC output and welding time control.