Patent ID: 7538293
Filing Date: 2009-05-26
Classification: B23K

Abstract:
1. A spot-welding tool for resistance welding of workpieces made of aluminum and having a brittle oxide layer, comprising: at least one welding tong; an electrode disposed on said at least one welding tong; and a strip ( a pressure element movably arranged on the electrode in a region of an electrode cap, said pressure element being adapted to lift the strip off of the electrode during or after opening of the welding tongs and said pressure element being displaced relative to the electrode via a force application means when the welding tong is opened; wherein a carrier material ( wherein said coating ( wherein said tool is structured such that during welding, pressure from said at least one welding tong breaks the oxide layer of said workpiece, and said coating is pressed into gaps of the oxide layer of the workpiece.