发明名称 |
RESISTANCE SPOT WELDING METHOD |
摘要 |
Proposed is a method of resistance spot welding to join a plurality of overlapping metal sheets, including: dividing a current pattern into two or more steps for welding; before actual welding, performing test welding to store, for each step as a target value, a time variation of an instantaneous amount of heat generated per unit volume and a cumulative amount of heat generated per unit volume; and subsequently, as actual welding, starting welding using, as a standard, a time variation curve of the instantaneous amount of heat generated per unit volume obtained by the test welding, and when a time variation amount of an instantaneous amount of heat generated deviates during any step from the time variation curve by a difference, performing adaptive control welding to control a current passage amount in order to compensate for the difference during a remaining welding time in the step. |
申请公布号 |
US2016008913(A1) |
申请公布日期 |
2016.01.14 |
申请号 |
US201414770592 |
申请日期 |
2014.01.24 |
申请人 |
JFE STEEL CORPORATION |
发明人 |
OKITA Yasuaki;SAWANISHI Chikaumi;IKEDA Rinsei;OI Kenji |
分类号 |
B23K11/11;B23K11/24 |
主分类号 |
B23K11/11 |
代理机构 |
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代理人 |
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主权项 |
1. A method of resistance spot welding to join materials to be welded by squeezing the materials between a pair of electrodes and passing current while applying pressure, the materials being a plurality of overlapping metal sheets, the method comprising:
dividing a current pattern into two or more steps for welding; before actual welding, performing test welding to store, for each step as a target value, a time variation of an instantaneous amount of heat generated per unit volume and a cumulative amount of heat generated per unit volume that are calculated from an electrical property between electrodes when forming an appropriate nugget by passing current with constant current control; and subsequently, as actual welding, starting welding using, as a standard, a time variation curve of the instantaneous amount of heat generated per unit volume obtained by the test welding, and when a time variation amount of an instantaneous amount of heat generated per unit volume deviates during any step from the time variation curve by a difference, performing adaptive control welding to control a current passage amount in order to compensate for the difference during a remaining welding time in the step so as to match a cumulative amount of heat generated in the actual welding to the cumulative amount of heat generated that is determined in advance in the test welding. |
地址 |
Tokyo JP |