Application Note: Cascade Welding
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ML-010041 Application Note: Cascade Firing
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To weld on gun #3: gun 3 must be closed and guns 1 and 2 must be
left open.
When multiple welding transformers are connected in parallel to one
welding control as shown in Figure 1, some additional rules should be
followed:
1.
No more than three weld transformers should be used.
2.
The delayed firing option should always be turned ON in the setup
parameters, regardless of what type transformers are used.
3.
The control should be operated in primary constant-current mode
ONLY! (Any other mode of operation is likely to cause
intermittent circuit breaker trips and/or poor weld quality.)
4.
Poly-pulse or pulsation welding should not be used.
Failure to follow these guidelines will result in diminished weld quality,
sticking electrodes, increased downtime caused by intermittent circuit
breaker trips and may void your warranty.
Multiple Output
Cascade Method
Another example of cascade welding is to use a single weld control
which has multiple outputs, one for each welding transformer (See
Figure 2).
Figure 2:
AC welding control with
three outputs, connected to three
welding transformers with three
welding guns
In this system, all three welding guns have the ability to be closed at the
same time. However, the welding control applies current to the welding
transformers in succession.
