发明名称 |
Method and apparatus for evaluating quality of resistance welds |
摘要 |
A method for evaluating quality of a resistance weld is provided, in which a nugget generation state during a welding process is evaluated by observable numerical values based on physical phenomena, and which can afford a wide application range in welding material as well as a capability of accurate knowledge as to the nugget generation state of the weld. Based on that a specific resistance value of a metal material to be welded has a temperature dependency in a conduction state of AC or current-pulsated welding current, a rate of change of inter-chip dynamic resistance instantaneous value during a current changing period is determined, a changing state of the dynamic resistance instantaneous value is further calculated, and a heat-generating state of a weld zone, i.e., a nugget formation state is estimated. Thus, a quality evaluation of a weld is performed accurately.
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申请公布号 |
US6140825(A) |
申请公布日期 |
2000.10.31 |
申请号 |
US19980075953 |
申请日期 |
1998.05.12 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
FUJII, KOJI;GOTO, YASUHIRO;RYUDO, MAKOTO;MATSUYAMA, KIN-ICHI |
分类号 |
G07C3/14;B23K11/24;B23K11/25;(IPC1-7):B23K11/24 |
主分类号 |
G07C3/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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