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Welding on header on car, advice?
I found a crack on header easily accessible. Friend can Tig it. Any advice on preventing damage to car systems? For example, remove battery connections, unplug MSD connector to distributor. Other concerns? Thank you for your help. Oh yes, fire prevention steps will be taken. :-).
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Put the welding ground cable directly on the header tube you will be welding.
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+1^
You will contain the electrical energy to the location of the repair and minimize the potential for damage to in car electronics. Ed |
Drill a small hole in the tube at both ends of the crack and then weld--------
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As the welding process proceeds, the air in the tube is being heated and absent the small air bleed holes the heated and expanding air in the tube would blow out a chunk of molten weld material from the weld joint. Ed |
You drill holes at the ends of the crack before welding the crack up, to remove the end of the crack, so the crack can't continue to crack in service, after the welding is done.
The crack is still evident under the weld if the ends of the crack aren't drilled. |
Holes...sage advice.
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You're right Gary. I was solving a problem that did not exist! It is definitely a way to prevent a continued spreading of the crack after welding. Ed |
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WOW!!!!!!!!! The method of drilling hole at end of crack came from aircraft repair---not race car chassis repair----and its not just for tubing repair---as I sit here with my morning coffee at 80 years old thinking about all the things I've welded over the years---the worst thing in my memory is cutting some barbeb wire off the top of a fence so I cut weld up the inside panel on a combine out in the field-------and yes-it did catch on fire but there was a creek nearby so the farmer could pour some water on my pants leg until I could get out-----
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A good weld is a thing of beauty, more of an art than a skill.
I took a couple classes at the Mesa Community College when I first retired but since I don't keep in practice, my welds don't look good until I'm about finished. The beginnings are reminiscent of pigeon poop. The grinder is my FRIEND! |
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On another note, a neighbour of mine was a welder by trade, mostly building tank trailers for highway usage. He had no love for welding overhead and said you basically had to let the spatter burn - if you tried to move it you just ended up with multiple burns. |
my dad welded at Studebakers back in the late forties early fifties. He said if a drop of molten metal dropped off it would burn through his coverall entering and exiting. You just stood there and waited but if it hit your belt and got stopped by it being too thick to burn through you had to pull your belt and such away from your body so it would pass on down. If it got stuck you got a nasty burn.
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Will disconnect the ignition box from distributor and ground lug from battery. Hope it doesn’t crap something out. Will keep the ground close to the weld zone. Also keep fire extinguisher handy.
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Shouldn't be any flying slag with tig welding also a much smaller heat area.
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As for the fire exinguisher----------also don't have anything parked outside the garage door---open door so IFFFFFFFFFFFFF you do start a FIREEEEEEEEEE you will be able to roll the car outside and down the drive away from building--------There have been previous occasions of house fires caused from cars being worked on------
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header weld.
Ground right on the pipe sounds like the way to go, and weld a bit at a time to keep the heat level down. Love them tigs.
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