welder issues - Vintage Mustang Forums
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post #1 of 8 (permalink) Old 10-19-2017, 02:53 PM Thread Starter
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welder issues

New one on me- Lincoln Welder 175, 220V; never had any issues but last night it started to 'pulse' all of a sudden while welding. I tried changing the wire speed faster and slower, also tried more and less gas- still does it. I cleaned the feed wheels and made sure the tension wasn't too much, checked the wire spool and it looks nice and clean, and had a new liner installed in the gun a month ago or so. If it hold still in 1 spot long enough it will weld smooth, but as soon as I move it it starts to pulse again? I cleaned the metal (cab mounts on new floors) but it still does it. Anyone else ever run across this? I can still get the floors and cab corners done, but would sure like it to run smooth again when I start sectioning the dash for a/c vents!

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post #2 of 8 (permalink) Old 10-19-2017, 03:11 PM
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I'll ask the obvious, was it the same size liner ? There are at least 2 sizes for different filler wire diameters.

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post #3 of 8 (permalink) Old 10-19-2017, 03:28 PM Thread Starter
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Quote:
Originally Posted by stephen_wilson View Post
I'll ask the obvious, was it the same size liner ? There are at least 2 sizes for different filler wire diameters.
Good question- I assume so. I took the whole gun into the dealer and he replaced it for me at the counter- $20 no charge labor. That was about 2 months ago and it's been working fine up until last night, so I assume it's correct, yes
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post #4 of 8 (permalink) Old 10-19-2017, 03:43 PM
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Look to each end of the new liner. May have shifted/developed a slight hang up since it was installed either going in or coming out. Carefully trimming a suspect end can solve that. You've probably already tried running it sans tip to see if the hesitation/pulse goes away but I'll mention it anyway just because.
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post #5 of 8 (permalink) Old 10-19-2017, 07:11 PM
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how clean is the wire ? it didn't get tangled on the spool right?
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post #6 of 8 (permalink) Old 10-19-2017, 07:42 PM
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I can offer Zero help as Iím still trying to master tacking, but once you get it figured out Iíd like to follow the progress.

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post #7 of 8 (permalink) Old 10-20-2017, 08:48 AM Thread Starter
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As far as the tip- that's what's got me puzzled. It feeds smooth as glass out of the tip- which I replaced 1st and found no difference. It only pulses while actually welding. I cleaned the ground spot, snugged up the cable to the clamp, and made sure it's tight in the box. When I get back to it this weekend I'm going to try a clean piece of steel on the bench and see what happens. Thanks for the tips guys!

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post #8 of 8 (permalink) Old 11-21-2017, 08:34 AM Thread Starter
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Sherlock!

Finally figured it out!! I've had it all apart several times and found nothing. Last night I pulled it apart again, only this time I pulled the trigger while the gun tip was apart. I found a small piece of debris- almost looked like a torn feather- inside the gun between the liner and the sleeve! Apparently when I pulled the trigger, the gas was pushing it into the tip and plugging up 2 of the 3 gas ports. When I'd taken it apart prior, it must have slipped back into the gun where I missed it. Reassembled and it welds like a champ again! Happy it works- feel like a DA that I missed it so many times
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