Method and apparatus for resistive spot welding
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United States of America Patent
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May 7, 2019
Grant Date -
Jan 21, 2016
app pub date -
Jul 16, 2014
filing date -
Jul 16, 2014
priority date (Note) -
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Abstract
An apparatus and corresponding methods are disclosed to resistively spot weld a stack of sheet metal having a plurality of sheets of sheet metal. In one embodiment, a method includes contacting a first welding tip to a first side of the stack and contacting a second welding tip to a second side of the stack, the second side comprising a thinnest exterior sheet of the stack, the second welding tip including a contacting surface area less than the first welding tip; applying a squeeze pressure to the stack; and applying a current to the stack by applying a first current pulse for a first duration followed by applying a second current pulse for a second duration longer than the first duration and with a lower current than a current of the first current pulse.
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