The Study on the Ineffective Mechanism of Aluminum Alloy Spot Welding Electrode
This study explored the electrode excessive burning reason caused by aluminum resistance spot welding and proposed a new electrode failure mechanism. The test shows that the oxide film of aluminum alloy workpieces causes the contact of non-uniform points between electrode and workpieces and instantaneously leads to a local explosion when setting up an electric circuit, bringing about the plastic deformation of the electrode surface in the local area, which will in turn exacerbate the contact of non-uniform points between electrode and workpieces so as to result in the serious burnout of electrodes under the interaction between local explosions and Cu-Al alloying. Cu-Al alloying and brittle material on the electrode surface caused by the contact of non-uniform points will firstly detach from the surface of electrode under the tearing force of mechanical , so that the electrode surface becomes more uneven.
Chunliang Zhang and Liangchi Zhang
H. Y. Yu et al., "The Study on the Ineffective Mechanism of Aluminum Alloy Spot Welding Electrode", Key Engineering Materials, Vols. 531-532, pp. 84-87, 2013