Indirect spot welding apparatus
AssigneeJfe Steel Corporation
InventorsMuneo Matsushita, Rinsei Ikeda
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Abstract
In the indirect spot welding apparatus, a lower limit in a stable pressing force region where the pressing force of the spot welding electrode against the metal sheets can be controlled within a tolerance of ±10% ranges from 70 N to 200 N and an upper limit in the stable pressing force region ranges from 800 N to 2000 N, and an overshoot OS(%)=(PL−AL)/AL×100 of the pressing force occurring when the spot welding electrode is pressed against the metal sheets is controlled to be 10% or less.
Claims2
An indirect spot welding apparatus configured to weld a member composed of at least two overlapping metal sheets by pressing a spot welding electrode against the metal sheets while applying pressure to the spot welding electrode from one side of the member, attaching a feeding point to the metal sheet on the other side of the member at a location separate from the spot welding electrode, and passing a current between the spot welding electrode and the feeding point, wherein a lower limit in a stable pressing force region where the pressing force of the spot welding electrode against the metal sheets can be controlled within a tolerance of ±10% ranges from 70 N to 200 N and an upper limit in the stable pressing force region ranges from 800 N to 2000 N, an overshoot of the pressing force occurring when the spot welding electrode is pressed against the metal sheets is represented by OS in Equation (1), and OS is controlled to be 10% or less:
- OS(%)=(PL−AL)/AL×100 (1)
- where PL represents a peak pressing force (N) in an overshoot range and AL represents an average pressing force (N) applied by the electrode.
Dependencies are inferred from the claim text.