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Old 05-24-2005, 06:32 PM
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Welding On Exhaust

I know there are different types of welding, but I don't know any of the differences. I want to learn to weld, mainly so I can do my exhaust on my own. But I first need to know what type of welding and what type of welder I should buy. If anyone could suggest the type of welder I would appreciate it. Thanks!

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Old 05-24-2005, 06:50 PM
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Get a MIG welder.
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Old 05-24-2005, 08:05 PM
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or failing that a flux core wire welder. THey aren't the top of the line units, but they can be gotten cheap and do the job as long as you don't mind knocking off the slag. I got some pretty nice beads going with mine, and I paid less than 200 bucks for the thing. The one thing I would say is just get something with enough amps to get some penetration. 70 amps and up is probably ok for wire work. Stick welder I wouldn't get anything that wasn't fully adjustable and nothing less than a max heat of 150 amps, 200 if you're going to do some really heavy stuff (more than likely the home hobbyist doesn't get into that type of metal).

K
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Old 05-24-2005, 08:31 PM
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pardon my ignorance, but I though you need a TIG to weld exhaust?





Mike
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Old 05-24-2005, 09:03 PM
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Quote:
Originally Posted by Nightfire
pardon my ignorance, but I though you need a TIG to weld exhaust?
Mike
Not necessarily, but if you want nice professional looking welds, show quality welds, then a TIG is what you need. A MIG is perfect for exhaust work.
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Old 05-24-2005, 09:41 PM
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mig welding is easier to do in tight spots and goes pretty quickly too. I would hat to have to TIG everything.

K
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Old 05-24-2005, 11:20 PM
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Is welding something I can learn with some time and attention on my own or am I way out of my league with this?
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Old 05-24-2005, 11:43 PM
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Tig is great but very expensive for a beginner. MIG and flux wire-feed is not a very good system for welding thin exhaust tubing, even for an expert welder. The absolute best for exhaust is oxy/acetylene gas welding. It is all position, gives very precise control and with very little practice you are laying down beautiful beads. Also perfect for laying down a braze fillet at the tube/flange joint for strength and good looks.

Best way to learn ,and the way I did it, is take a couple of semesters of welding at your local JC. In two semesters you will learn stick arc, oxy/acetylene, and MIG well enough to do great things on anything you want to weld, and it is relatively dirt cheap!
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Old 05-25-2005, 03:53 AM
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Although it has been a while, I have always welded exhaust with a torch. That is the same way as most muffler shops did it too. If the exhaust parts are off the vehicle and on the floor or bench, mig welding will work with some practice on the same material, as the mig has to be set up for that material anyway. It's alot easier using a torch than trying to get the Mig torch in the right angle in many places on the vehicle.
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Old 05-25-2005, 04:23 AM
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I built the exhaust for my V8 S-10 using a mig welder. The pipe came from a local parts store, 90 and 45 degree bends with some straight sections. Keep plenty of fresh Sharpies handy! LOL. I test fitted, tacked, tested again, and then welded each section. I left enough slip fittings (clamped) so it could be removed if necessary. My plan was to build it good enough to later use as a template for mandrel pipe. The job came out so good that I'm going to leave it as it is. No leaks, no rattles...yet. LOL

The pictures are from my cell phone but you get the idea.
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Old 05-25-2005, 04:40 AM
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Willys is right about the Oxy/Acy welding, that is how I learned, but since I have been using my Miller 175 I can't imagine doing it any other way.

Vince
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Old 05-25-2005, 09:51 AM
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Alright, so I need either a Mig Welder or a Torch is what I have gathered. I have access to a torch, but I also found a 90 amp Chicago Electric Mig Welder for around $160.00. Not knowing too much about this, is Chicago Electric pretty good? And I think I may play with the torch a bit this weekend, I have some experience
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Old 05-25-2005, 10:08 AM
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I agree the MIG is the best all-round welder to get and can very successfully weld exhaust. But the original question was 'what was the best way to weld exhaust' and nothing beats O/A gas welding. The CP (Harbor Freight house brand) is a fine machine but I recommend you go to your local Harbor Freight store and price the comparable Lincoln welder. Not that much more than the CP and will have a better likelihood of being supported for your whole career. Get the gas kit and a large cylinder for CO2/argon and the 0.023" liner. Run solid wire and gas for everything. The flux core wire is only good for building wrought iron fence.
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Old 05-25-2005, 10:28 AM
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Torches and such

If I had to give up my welding equipment I would want to hang on to the O/A set..I can weld about anything I ever need to deal with on a car with that..

The MIG is real nice to have and Tigging stuff is only real necessary if one is dealing with some pretty exotic alloy like 4130 and that can be O/A welded if it is done right..

Practice the skills with O/A and get that right and you will be weel served in the future..

Just me 2 centavos

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Old 05-25-2005, 11:34 AM
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I suppose OA welding would be a very nice, tight seal with great heat control, but I would hate to do that upside down! That's why I like to wire my stuff.

K
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