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B-34 OPERATION
EXAMPLE 1 - 2 STEP TRIGGER: Simple operation The simplest trigger operation occurs with a 2 Step trigger and the Start, Crater and Burnback functions all set to OFF. (See Figure B.19)
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
WELD:
The power source output and the wire feed speed con- tinue at the weld settings for as long as the trigger is pulled.
POSTFLOW: As soon as the trigger is released, the power source output and the wire feed speed are turned OFF. Shielding gas continues until the post flow timer expires.
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Idle
Shielding On
Trigger Pulled | Arc Established |
Preflow | Strike |
FIGURE B.19
2 Step Trigger
Start = OFF
Crater = OFF
Burnback = OFF
Weld
Trigger Released
Pos tflow | Idle |
Return
Return
Gas
Off
Power | Weld | |
1.5 sec max. | ||
Source | ||
Output | Off | |
|
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WFS
Weld
Off
