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#4586359 - 11/27/17 08:33 AM Welder type for DIY exhaust work?
koffy Offline


Registered: 01/24/15
Posts: 129
Loc: Around the corner
My xterra as well as my sisters sienna developed a large exhaust leak,,, something common here in LI NY, so I was thinking about buying a cheap flux welder to do it myself. However, reading on the web people say that those welders are not good for this kind of stuff, that I should get a good mig welder, but those are not cheap, keeping in mind that I wonít use it often, I donít know if it really make sense.


Edited by wwillson (11/28/17 06:10 AM)
Edit Reason: subject clarification

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#4586362 - 11/27/17 08:36 AM Re: Welder type for DIY exhaust work? [Re: koffy]
2015_PSD Offline


Registered: 09/26/10
Posts: 7347
Loc: SE Texas
How about renting one? If it is only for a one-time use, it would not make a lot of sense to buy one.
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#4586375 - 11/27/17 08:47 AM Re: Welder type for DIY exhaust work? [Re: koffy]
Rand Offline


Registered: 08/20/03
Posts: 12728
Loc: NE,Ohio
around here at least the right place would fix all that for cheap.. do you have a lift?

You will probably need one to weld it properly.
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#4586380 - 11/27/17 08:52 AM Re: Welder type for DIY exhaust work? [Re: koffy]
Donald Offline


Registered: 03/21/04
Posts: 20565
Loc: Upstate NY
You can probably replace the exhaust with new system without a welder.

People use gas to cut rusted-out sections.

I have had a place use a welder to make up an exhaust for my Jeep from SS pipe. That was TIG welding.

If parts are rusted they should be replaced not patched.

Do you know how to MIG weld. If not you will be burning through a lot.
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#4586381 - 11/27/17 08:53 AM Re: Welder type for DIY exhaust work? [Re: koffy]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
Is it a hole in the pipe? Can you just put a pipe joiner clamp around it?

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#4586402 - 11/27/17 09:15 AM Re: Welder type for DIY exhaust work? [Re: Donald]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
Originally Posted By: Donald

Do you know how to MIG weld. If not you will be burning through a lot.


A LOT... a lot a lot a lot

Rusty exhaust pipe isn't the type or place to "learn" to weld.
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#4586450 - 11/27/17 10:02 AM Re: Welder type for DIY exhaust work? [Re: koffy]
NoNameJoe Offline


Registered: 06/03/15
Posts: 434
Loc: New York
Originally Posted By: koffy
My xterra as well as my sisters sienna developed a large exhaust leak,,, something common here in LI NY, so I was thinking about buying a cheap flux welder to do it myself. However, reading on the web people say that those welders are not good for this kind of stuff, that I should get a good mig welder, but those are not cheap, keeping in mind that I wonít use it often, I donít know if it really make sense.
This seems like one of those things that you come in with high expectations and end up destroyed, don't even bother.

If you're not already good with a welder your options are realistically:
1. Replace the rusted part of the exhaust.
2. Cut the rusted part out and join the pipes by making a lap joint with a band clamp, connector, reducer or flex joint connector and some U-clamps (obviously not going to work if the opening is on a catalytic converter).
3. If the hole is small just wrap a band clamp around it.

Options 2 and 3 are extremely cheap, less than twenty dollars in material cost and have a higher chance of working (if you measured and removed any rusted fasteners or clamps, nearly 100% chance of working).

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#4586475 - 11/27/17 10:39 AM Re: Welder type for DIY exhaust work? [Re: NoNameJoe]
JC1 Offline


Registered: 11/29/08
Posts: 3062
Loc: Oshawa, Ontario Canada
I bought a cheap $99 welder to do those types of repairs. It's a pain in the neck to do. Next time i just bought the whole section of pipes and replaced it.


Unless you want to invest the time to learn proper welding techniques and have ample time to burn, it's probably better to find alternatives to fixing stuff.
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#4586549 - 11/27/17 12:23 PM Re: Welder type for DIY exhaust work? [Re: koffy]
koffy Offline


Registered: 01/24/15
Posts: 129
Loc: Around the corner
Ok,,, I guess It was not a good idea,, to many cons,, itís usually the flanges and flex joints,,, Iíll ask my friends for a good shop to take care of it,,, we canít always win (DIY everything )
Tanks guys your help is appreciated

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#4586626 - 11/27/17 01:37 PM Re: Welder type for DIY exhaust work? [Re: koffy]
jeepman3071 Offline


Registered: 04/15/10
Posts: 4316
Loc: Storrs, Connecticut
A lot of newer cars have exhaust sections that bolt together. Cut off the old rusty bolts from the damaged section, bolt-in a new one with new flange gaskets.
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#4586632 - 11/27/17 01:42 PM Re: Welder type for DIY exhaust work? [Re: koffy]
mk378 Offline


Registered: 09/27/15
Posts: 1449
Loc: USA
When a pipe gets rusty enough that one hole opens up, there will be more soon afterward. You're ahead to bite the bullet and replace the whole section, usually that means do everything from the converter to the tailpipe as a group. And any sort of DIY exhaust work is not fun.

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#4586693 - 11/27/17 02:34 PM Re: Welder type for DIY exhaust work? [Re: koffy]
Miller88 Offline


Registered: 04/09/08
Posts: 12753
Loc: Onondaga County
I used the good ol' harbor freight boogermaster to weld my exhaust together. It's not pretty as it's a pretty thin gauge to get a good weld with the HF model. Held up great for a few years with no leaks. Ultimately a poorly placed boulder ripped the entire exhaust system off ... but not at my welds! So I took a different route.
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#4586706 - 11/27/17 02:44 PM Re: Welder type for DIY exhaust work? [Re: Miller88]
NoNameJoe Offline


Registered: 06/03/15
Posts: 434
Loc: New York
Originally Posted By: Miller88
boogermaster
LOL!!! That's exactly what it is. crackmeup

Quote:
itís usually the flanges and flex joints,,,

They sell pieces of flex joints. For the flanges, you can just cut the flange out and replace with a section of pipe connector or a reducer.

It just means that where you had to take the nuts and bolts off to undo the flange coupling, you now have to take off some U clamps and slip the pipes out of the connector or reducer.

If the flange used spring bolts, those slip and move under tension as the engine vibrates and is usually used as an alternative to a flex joint in the exhaust system. Replacing that with a straight rigid section may not be so good, they sell flex joint sections for this purpose.

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#4586711 - 11/27/17 02:46 PM Re: Welder type for DIY exhaust work? [Re: koffy]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Originally Posted By: koffy
I was thinking about buying a cheap flux welder to do it myself.


That will never work for exhaust tubing. Flux core wire burns way too hot for thin material like that. You need steel that's at least a 1/4 inch thick. I just saved you a lot of frustration.

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#4586742 - 11/27/17 03:14 PM Re: Welder type for DIY exhaust work? [Re: koffy]
Donald Offline


Registered: 03/21/04
Posts: 20565
Loc: Upstate NY
A good Lincoln MIG welder is $800. It should be 220v. You want to use gas for shielding unless your welding outside in the wind, then maybe flux core.
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