Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1998-05-12
2000-10-31
Metjahic, Safet
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324703, 219110, B23K 1124
Patent
active
061408255
ABSTRACT:
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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Fujii Koji
Goto Yasuhiro
Matsuyama Kin-ichi
Ryudo Makoto
Matsushita Electric - Industrial Co., Ltd.
Metjahic Safet
Solis Jose M.
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