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Old 12-12-2015, 08:20 AM
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Intermittent Mig issue

I have a 120V Lincoln SP135+ Mig.

I weld a lot of sheet metal with it. So I do short burst stitches much of the time.

Sometimes the trigger doesn't react at all. No click or anything. It's annoying when it happens. The problem then will disappear for a while but then comes back.

It's been doing this for a quite a while now and I'd like to know where to look to solve the issue.

Do I need to just replace a part somewhere? Ideas?

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Old 12-12-2015, 08:38 AM
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most likely the contacts on the trigger or your ground. Check your visible areas around the ground first.
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Old 12-12-2015, 11:47 AM
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Quote:
Originally Posted by roger1 View Post
I have a 120V Lincoln SP135+ Mig.

I weld a lot of sheet metal with it. So I do short burst stitches much of the time.

Sometimes the trigger doesn't react at all. No click or anything. It's annoying when it happens. The problem then will disappear for a while but then comes back.

It's been doing this for a quite a while now and I'd like to know where to look to solve the issue.

Do I need to just replace a part somewhere? Ideas?

trouble shooting starts on digital page 39 printed page section E1.... here is the pdf file for your computer or phone..

http://www.lincolnelectric.com/asset...OLN3/im725.pdf

digital page 39 tells how to get the rings off the handle to access the gun trigger switch in the handle..

digital page 11 printed A4 gun installation paragraph 4 tells how to hook up the gun trigger connections inside the side cover.. so you should be able to ohm the trigger switch and wiring with the machine unplugged. hint.. use the continuity beep mode of your digital volt meter while you are holding the trigger on.. again.. the machine is unplugged and the trigger wiring.. at least one end is disconnected.. listen to the continuity beeper as you wiggle and flex the cable and repeatedly operate the trigger. are my instructions on how to test the trigger.. it seems there is a diode in there also that will open up the circuit if something gets too hot.. prevents melting things.. edit.. you may end up needing to reverse your volt meter leads to get the continuity beeper to work thru the diode ..

i did not look but i bet that these little machines are NOT CONSTANT DUTY like a really large machine .. so digital page 8.. printed page A1.. this machine is a 20% duty cycle machine at 90 Amps.

and somebody will correct me.. but that is probably ONE minute of welding.. FOUR minutes NOT WELDING, but COOLING with the fan on.

how far can you push the duty cycle??? probably until something cycles off or the welder fails..

i hope this helps..

Last edited by 69612; 12-12-2015 at 11:56 AM.
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Old 12-12-2015, 01:13 PM
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I just went through this very issue with my Hobart Handler. I took the handle apart and cleaned the contacts for the trigger. Problem fixed for free in 10 minutes.

That may not be your problem but I'll bet a dollar to a doenut it is.

John
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Old 12-12-2015, 03:42 PM
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Welder issues

I too had a problem with a Hobart after doing a BUNCH of stitching. Turns out it was the clamp on the ground cable inside the door. It had arced so much the aluminum block was melted, black and no longer provided ground to the ground cable.
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Old 12-12-2015, 04:13 PM
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I guess the good news is either one should be a simple repair.

John
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Old 12-12-2015, 05:03 PM
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connections.

My old Airco Tig was giving me problems and I couldn' t see anything wrong. I cleaned all the contacts cable connections with a stainless steel brush, put it back together and it now works fine.
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Old 12-12-2015, 05:15 PM
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Quote:
Originally Posted by tech69 View Post
most likely the contacts on the trigger or your ground. Check your visible areas around the ground first.
I'm guessing you are correct and will be the first thing I check.
I just took a quick look and it looks like the wires inside the case are OK.

If it's not the contacts at the trigger switch, then it would have to be the relay inside the unit that the trigger activates.

If it were a ground problem to the metal being welded, the motor would still run. It does nothing when it acts up. Not a peep from anything.
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