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You program the welding control in Current Regulation mode and
you think that your welding process is completely in control. Unfortunately,
it is possible to shunt current away from the work piece if the
current monitoring devices are not situated in the immediate vicinity
of the work piece. Typically, current monitoring devices are installed
on the primary side of the welding transformer and the control translate
the value into secondary current by a programmed turns ratio. Even
if the current monitoring device is placed on the secondary side
of the welding transformer, it is placed in a safe area that will
not interfere with the mechanical welding tools. Shunting paths
that can occur typically happen after the monitoring devices. For
example, as the welding gun is clamping the work piece, other parts
of the gun may make contact with other parts of the work piece causing
current to divide itself. In the example above, the weld schedule
calls out for 10,000 amperes however only 8,000 amperes goes to
the weld area and the other 2,000 finds another path through a shunting
condition. The result would be a failed weld. The user would then
need to know that this has occurred.
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