| 摘要 |
PURPOSE:To enable uniform tempering over the entire part of a spot-weld zone by expanding the conducting region of the temper current in spot welding up to the outside circumferential part of the nugget obtd. by spot welding. CONSTITUTION:A nugget 3 is formed by spot-welding overlapped steel plates 1 to be welded by electrode chips for welding. Electrode chips 4 to be used exclusively for tempering inserted onto the electrode chips for welding freely slidably so as to maintain the inside circumferential distance of the contact current conducting surfaces at <=10mm. from the outside circumference of the contact current conducting surfaces of the electrode chips for welding and to maintain the outside circumferential distance of the contact current conducting surface at >=5mm. and <=15mm. from the outside circumference of the contact current conducting surface of the electrode chips for welding are lowered. The electrode chips for welding are risen in contact with the surface of the steel plates 1 in the outside circumferential part in the region where the current is conducted by the electrode chips for welding to conduct the temper current from the chips 4. |
