| 摘要 |
PURPOSE:To provide a titled electrode which has high durability and can perform spot welding at a long dressing interval by providing a thin coating layer of silver or a sliver alloy at the top end of the electrode. CONSTITUTION:An electrode for resistance welding for Al or an Al alloy is formed by using copper or a copper alloy such as Cu-Cr, Cu-Zr, Cu-Zr-Cr, Cu-Cd or the like as a base material, and providing a coating layer of silver or a silver alloy at the top end thereof. Said electrode has high durability particularly as a resistance spot welding electrode, has a long dressing interval and is free from defects such as a decrease in various kinds of strength or the like in the weld zone of base materials. Said coating layer is easily formed by a method of fixing the electrode on a lathe, pressing silver or a silver alloy to the top end thereof while rotating the electrode and sticking the silver or silver alloy to about the thickness at which the copper-colored base of the electrode is made invisible. |
