1) sometimes prefabricated one or more of the bump and need additional processes; 2) welding solder joints with an electrode at the same time, the workpiece alignment and bump dimensions (in particular is highly) must maintain close tolerances in order to ensure uniform power strongly and welding current, in order to make uniform solder joint quality; 3) Welding Electrode Manufacturer solder joints, need to use the high electrode force, high mechanical precision, high-power Welding Flux, pressurizing mechanism should be higher with mobility.