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Old 11-01-2023, 06:17 AM
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Gadgeteer Gadgeteer is offline
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Default Adding pre-flow to spool gun

I discovered a short time ago that the problem with aluminum wire burn-back at startup when using my spool gun was due to not having sufficient Argon gas coverage upon initiation of the arc. I solved the problem by holding the trigger for a few seconds before starting to weld, so the gas could get through the hose to the gun’s tip. But, then I had to grab my side cutter, and snip the excess wire before I could start the weld. So, I added a normally closed momentary switch to disable the drive motor. My modification allows me to trigger the gas solenoid without powering the wire drive motor. Thusly, I can, now, just grab the gun, cut the motor, charge the hose with gas, and proceed.

Momentary N/C switch for refrigerator light... local Radio Shack no longer stocks small electrical parts, so had to go to Ace for the switch.

Photos: 1 Before, 2 After, 3 Done
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Last edited by Gadgeteer; 11-01-2023 at 06:24 AM.
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  #2  
Old 11-01-2023, 12:21 PM
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Shade Tree Welder Shade Tree Welder is offline
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Nice fix. My 30A spoolmatic gun, the trigger if you depress it partially, the gas
flow, mechanical valve. Then with full depression it engages the feed motor
and welding power contactor.
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  #3  
Old 11-02-2023, 06:21 PM
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Quote:
Originally Posted by Shade Tree Welder View Post
Nice fix. My 30A spoolmatic gun, the trigger if you depress it partially, the gas
flow, mechanical valve. Then with full depression it engages the feed motor
and welding power contactor.
Interesting... did not know that.
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  #4  
Old 11-02-2023, 11:02 PM
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CaddmannQ CaddmannQ is offline
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Wait a minute . . . You still have a RadioShack?
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