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Tractor Talk Discussion Forum

Welding near a engine's electrical system?

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JD jim A.

01-05-2005 17:05:01




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I know that welding on a bigger machine with a generator or alternator is a bad idea, but what about small engines? I've got a self-propelled feedcart with a cracked motor mount I need to repair. I'll be using an arc welder. It has a 5.5 horsepower OHV Honda, a GX160 I think. The engine is about two years old. It dosen't have electic start or a charging system, but could the ignition system be damaged? I'm not sure if a small engine this new would have anything fancy in the ingition system that could get damaged?

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Bob

01-06-2005 07:20:31




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 Re: Welding near a engine's electrical system? in reply to JD jim A., 01-05-2005 17:05:01  
I do a lot of welding on tractors and vehicle with electronic systems, and had yet to have a problem. Not that it can't happen!

I believe a it's a good idea to completely disconnect the battery, and then clamp the (+) and (-) battery cables together. I was taught that by a welding instructor YEARS ago, and so far, I've had no problems with that advice.



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buickanddeere

01-06-2005 06:24:02




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 Re: Welding near a engine's electrical system? in reply to JD jim A., 01-05-2005 17:05:01  
Wiring or coils of wiring will have voltage induced. And current flow if the path is complete when a varying magnetic field is passed through the wiring. Welding cable or any wire amplifies the magnetic strength if coiled. The electric arc it's self, transmits emf. This is picked up on wiring as electrical voltage as well. The square root law applies here. Arcs or wires 2x closer is 4 times more energy. 3x closer is nine times more energy. Solid state components are susceptible to voltage spike that are harmless to breaker points/condensers.

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T_Bone

01-05-2005 23:21:22




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 Re: Welding near a engine's electrical system? in reply to JD jim A., 01-05-2005 17:05:01  
Hi Jim,

Where most people get into trouble welding around magnets or electronics is grounding too far away from the electrode.

Keep your ground close to your electrode and your welding leads straight, not coiled, then you won't have any problems.

T_Bone



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farmalljim10

01-05-2005 17:32:27




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 Re: Welding near a engine's electrical system? in reply to JD jim A., 01-05-2005 17:05:01  
Do not weld by it You might be alright but it has magnets in its flywheel and yes it has a coil also so you never know .. I would take it off..



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