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Welder type for DIY exhaust work? #4586359
11/27/17 08:33 AM
11/27/17 08:33 AM
Joined: Jan 2015
Posts: 132
Around the corner
koffy Offline OP
koffy  Offline OP
Joined: Jan 2015
Posts: 132
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.

Last edited by wwillson; 11/28/17 06:10 AM. Reason: subject clarification
Re: Welder type for DIY exhaust work? [Re: koffy] #4586362
11/27/17 08:36 AM
11/27/17 08:36 AM
Joined: Sep 2010
Posts: 7,594
Planet Earth
2015_PSD Offline
2015_PSD  Offline
Joined: Sep 2010
Posts: 7,594
Planet Earth
How about renting one? If it is only for a one-time use, it would not make a lot of sense to buy one.

Re: Welder type for DIY exhaust work? [Re: koffy] #4586375
11/27/17 08:47 AM
11/27/17 08:47 AM
Joined: Aug 2003
Posts: 13,138
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 13,138
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.


2019 Jeep Cherokee Trailhawk 2.0T
Re: Welder type for DIY exhaust work? [Re: koffy] #4586380
11/27/17 08:52 AM
11/27/17 08:52 AM
Joined: Mar 2004
Posts: 21,114
Upstate NY
Donald Online content
Donald  Online Content
Joined: Mar 2004
Posts: 21,114
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.


2015 Subaru Forester 2.5 engine/CVT
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Re: Welder type for DIY exhaust work? [Re: koffy] #4586381
11/27/17 08:53 AM
11/27/17 08:53 AM
Joined: Aug 2008
Posts: 21,276
ON, Canada eh?
StevieC Online content
StevieC  Online Content
Joined: Aug 2008
Posts: 21,276
ON, Canada eh?
Is it a hole in the pipe? Can you just put a pipe joiner clamp around it?



'18 Dodge Grand Caravan GT - AMSOIL SS 5w20
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF
Re: Welder type for DIY exhaust work? [Re: Donald] #4586402
11/27/17 09:15 AM
11/27/17 09:15 AM
Joined: Dec 2016
Posts: 7,143
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,143
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.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Welder type for DIY exhaust work? [Re: koffy] #4586450
11/27/17 10:02 AM
11/27/17 10:02 AM
Joined: Jun 2015
Posts: 537
New York
NoNameJoe Offline
NoNameJoe  Offline
Joined: Jun 2015
Posts: 537
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).


2015 Civic LX Coupe
Re: Welder type for DIY exhaust work? [Re: NoNameJoe] #4586475
11/27/17 10:39 AM
11/27/17 10:39 AM
Joined: Nov 2008
Posts: 3,283
Oshawa, Ontario Canada
JC1 Offline
JC1  Offline
Joined: Nov 2008
Posts: 3,283
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.


2015 Grand Caravan SXT Plus 5w-20 PPPP/Fram Ultra Filter
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Re: Welder type for DIY exhaust work? [Re: koffy] #4586549
11/27/17 12:23 PM
11/27/17 12:23 PM
Joined: Jan 2015
Posts: 132
Around the corner
koffy Offline OP
koffy  Offline OP
Joined: Jan 2015
Posts: 132
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

Re: Welder type for DIY exhaust work? [Re: koffy] #4586626
11/27/17 01:37 PM
11/27/17 01:37 PM
Joined: Apr 2010
Posts: 4,558
Storrs, Connecticut
jeepman3071 Online content
jeepman3071  Online Content
Joined: Apr 2010
Posts: 4,558
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.


2000 Jeep Cherokee 4.0L (181k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (36k) - Castrol Edge Euro 0w40, MANN HU816X
Re: Welder type for DIY exhaust work? [Re: koffy] #4586632
11/27/17 01:42 PM
11/27/17 01:42 PM
Joined: Sep 2015
Posts: 1,594
USA
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,594
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.

Re: Welder type for DIY exhaust work? [Re: koffy] #4586693
11/27/17 02:34 PM
11/27/17 02:34 PM
Joined: Apr 2008
Posts: 12,982
Onondaga County
Miller88 Offline
Miller88  Offline
Joined: Apr 2008
Posts: 12,982
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.


18 Forester 2.5I 6M
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Re: Welder type for DIY exhaust work? [Re: Miller88] #4586706
11/27/17 02:44 PM
11/27/17 02:44 PM
Joined: Jun 2015
Posts: 537
New York
NoNameJoe Offline
NoNameJoe  Offline
Joined: Jun 2015
Posts: 537
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.


2015 Civic LX Coupe
Re: Welder type for DIY exhaust work? [Re: koffy] #4586711
11/27/17 02:46 PM
11/27/17 02:46 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
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.

Re: Welder type for DIY exhaust work? [Re: koffy] #4586742
11/27/17 03:14 PM
11/27/17 03:14 PM
Joined: Mar 2004
Posts: 21,114
Upstate NY
Donald Online content
Donald  Online Content
Joined: Mar 2004
Posts: 21,114
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.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
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