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Tool Talk Discussion Forum

Lincoln SAE 300 Magnetism

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G6 at Snook, TX

07-16-2020 17:48:41




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We had an interesting thing happen today. The SAE 300 I have was welding progressively worse throughout the day and it was acting like the pipe was severely magnetized. (We're rebuilding a stock pen with old oil field tubing.) Anyhow, it got to the point we switched to a Lincoln Ranger and there was no issue with magnetism at all.
The local welder mechanic we talked to suggested that the SAE had developed magnetism in the stinger (+) lead. The leads are wrapped around a standard homemade lead tree. Unwrapped the positive lead, stretched them out on the ground, and viola the SAE was back to normal.
For those who know, is that an occasional but common problem? Or if it recurs a symptom of a greater problem in the machine itself. The leads are 200' in total with them being 2/0 cable except a 25' whip end that is #1 cable. I'm in central Texas, it has been hot, and we've welded pretty hard the last three days. The machine is mounted on a trailer and properly grounded.

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G6 at Snook, TX

07-17-2020 19:42:19




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 Re: Lincoln SAE 300 Magnetism in reply to G6 at Snook, TX, 07-16-2020 17:48:41  
Update: We unrolled the leads yesterday and had good success. Welded all day today and had nary a problem. Laid good beads and was smooth as a professional machine like an SAE should be.

What we experienced yesterday was the arc blow that s typical with magnetism. The fellow who was welding for me referred to it as some of the worst magnetism he'd experienced and it progressed from bad to worse as yesterday unwound.
We have come across plenty of pipe magnetized and we have done the wrap trick which works fairly well.
Thanks for the replies.

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MarkB_MI

07-18-2020 03:03:30




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 Re: Lincoln SAE 300 Magnetism in reply to G6 at Snook, TX, 07-17-2020 19:42:19  
> What we experienced yesterday was the arc blow that s typical with magnetism.

Well, if you coil the leads, they will generate a magnetic field while you're welding. And that COULD magnetize any nearby steel, including whatever they're wrapped around. I can see if there's pipe laying in the vicinity of the coiled leads, some of the magnetic flux COULD pass through the pipe and affect your welding, even though the coiled leads are a long distance from where you're welding. Maybe.

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Retired Farmer

07-17-2020 11:23:47




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 Re: Lincoln SAE 300 Magnetism in reply to G6 at Snook, TX, 07-16-2020 17:48:41  
You are not supposed to have your leads coiled up while welding. Messes with the arc if they are coiled.



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Mike(NEOhio)

07-17-2020 07:02:38




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 Re: Lincoln SAE 300 Magnetism in reply to G6 at Snook, TX, 07-16-2020 17:48:41  
I'm not a welder but I worked at Lincoln in R&D for a number of years and did some robotic welding on linepipe. Sometimes moving the ground from one side of the joint to the other had an effect. I think in your case it was just having the lead coiled. I worked in the robotics division for a while. The robotic cells came with a standard 25 foot controller-to-robot cables. In a small cell that was too much. Some customers didn't like the messy pile of cables so they hung them in nice neat coils which screwed up the signals. I also notice that arc blow affects aluminum much more than steel. I designed a fixture for a customer to weld an aluminum drip pan. They built the fixture from a large block of steel. Wasn't necessary for a light part but that's how it's often done. After 50 or 60 parts the welds went to h**l. Turned out the block was magnetized. After degaussing the welds were good for a while.

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MarkB_MI

07-17-2020 05:43:38




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 Re: Lincoln SAE 300 Magnetism in reply to G6 at Snook, TX, 07-16-2020 17:48:41  
Just to be clear, are you saying you experienced arc blow or something else?



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Repairman60

07-17-2020 05:05:05




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 Re: Lincoln SAE 300 Magnetism in reply to G6 at Snook, TX, 07-16-2020 17:48:41  
Welding is totally out of my realm of knowledge but the tree you have your lead wrapped on could it become magnetized and create the issue? Just asking.



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Ralph, Ohio

07-17-2020 05:34:46




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 Re: Lincoln SAE 300 Magnetism in reply to Repairman60, 07-17-2020 05:05:05  
From another non-welder: My guess is the issue is not actually magnetism but rather the inductive effect the coil of wire has on the welding current. Therefore unwrapping the coil fixed the problem.



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MarkB_MI

07-17-2020 02:52:27




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 Re: Lincoln SAE 300 Magnetism in reply to G6 at Snook, TX, 07-16-2020 17:48:41  
I don't see how copper leads could become magnetized.



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Ultradog MN

07-17-2020 00:10:10




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 Re: Lincoln SAE 300 Magnetism in reply to G6 at Snook, TX, 07-16-2020 17:48:41  
I worked for a pile driving outfit in Anchorage for a few months one summer. They drove used 6" well pipe through the permafrost for foundations for a bunch of duplex townhomes. We set I beam on top of the pipe and welded it on. Then they built the buildings on that.
The well pipe was highly magnetized. What we did was wrap your stinger lead several wraps around the pipe. Sometimes clockwise, sometimes counter clockwise. You had to experiment - number of wraps, CW/CCW, etc. Sometimes you could wrap the ground lead one way or the other around the pipe and that would help. It was kinda freaky how that magnetism would blow your arc in odd ways. Never heard of your leads getting magnetized though.

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