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B-37 OPERATIONB-37
EXAMPLE 4 – 4 STEP TRIGGER: Trigger Interlock The 4 step trigger can be configured as a trigger inter- lock. Trigger interlock adds to the welder’s comfort when making long welds by allowing the trigger to be released after an initial trigger pull. Welding stops when the trigger is pulled a second time and then released, or if the arc is interrupted. (See Figure B.22)
For this sequence,
PREFLOW:
Shielding gas begins to flow immediately when the gun trigger is pulled.
STRIKE:
After preflow time expires, the power source regulates to the welding output and wire is advanced towards the work piece at the Strike WFS. If an arc is not estab- lished within 1.5 seconds, the wire feed speed will jump to the welding wire feed speed.
WELD:
The power source output and the wire feed speed con- tinue at the weld settings. Welding continues when the trigger is pulled a second time.
POSTFLOW:
As soon as the trigger is released for the second time, the power source output and the wire feed speed are turned OFF. Shielding gas flows until the post flow timer expires.
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Trigger Pulled | Arc Established | |||
Id le | Preflo w | Stri ke |
|
|
| ||||
Shielding On
Gas Off 
Trigger Released
FIGURE B.22 |
| |
4 Step Trigger |
| |
Start = OFF |
| |
Crater = OFF |
| |
Burnback = OFF | Trigger Pulled | |
Weld | ||
|
Trigger Released
Burnb ack Postflow Idl e
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Power | We ld |
1. 5sec max. | |
Source | Start |
Output | Crater |
| Off |
We ld
WFS Cra te r
Off 
