Electrode Lifetime in Spot Welding Galvanized Sheet with Insert Material
The effect of copper strips as an insert material on electrode failure has been studied during spot welding of galvanized sheets. The results showed that an extended electrode lifetime was obtained due to the use of copper strips between electrode and workpiece which prevented electrode from alloying with molten zinc and lowered the temperature of electrode tip. In addition, the presence of inserted copper strip increased the resistance of welding system, thus generated much more heat to form larger nugget The electrode degradation mechanism was basically caused by deformation at electrode tip and wear.
Yungang Li, Pengcheng Wang, Liqun Ai, Xiaoming Sang and Jinglong Bu
G. W. Shuai et al., "Electrode Lifetime in Spot Welding Galvanized Sheet with Insert Material", Advanced Materials Research, Vols. 291-294, pp. 915-918, 2011