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Username Post: What kind of brazing rod for exhaust work??        (Topic#234604)
first_stater 
Forum Newbie
Posts: 80

Loc: Wilmington,DE
Reg: 12-25-09
01-30-10 05:15 AM - Post#1852689    

I'm a refrigeration mechanic and have alot of 45% silver brazing rod. It flows at around 1200 degrees I think. Could I use this for my exhaust project??
"I refuse to tiptoe through life
only to arrive safely at death..."


 
leon phelps 
Valued Contributor
Posts: 3438
leon phelps
Loc: Croydon Manor, PA
Reg: 06-04-05
01-30-10 09:05 AM - Post#1852786    
    In response to first_stater

may want to try asking the question at aws.com
Metallica Fuel


 
first_stater 
Forum Newbie
Posts: 80

Loc: Wilmington,DE
Reg: 12-25-09
01-30-10 01:48 PM - Post#1852940    
    In response to leon phelps

Will do.....
"I refuse to tiptoe through life
only to arrive safely at death..."


 
aghaga 
"4th Year" Silver Supporting Member
Posts: 1772

Age: 60
Loc: Altavista, Va.
Reg: 07-05-08
01-30-10 02:22 PM - Post#1852970    
    In response to first_stater

www.aws.org

 
100 CHEVY 
Dedicated Enthusiast
Posts: 5626
100 CHEVY
Loc: Helena,Missippi,U.S.A.
Reg: 12-09-04
01-30-10 02:46 PM - Post#1852992    
    In response to first_stater

You can on the steel or aluminized steel.I don't know about stainless.
On stainless,I use the pink welding rod(308/309?).It works on mild steel also.
Mike.
"You gonna leave it like that?
http://www.picturetrail.com/100chevy


 
Stinky 
Senior Member
Posts: 1223

Loc: Whitewater, CO
Reg: 05-25-01
01-30-10 07:33 PM - Post#1853166    
    In response to 100 CHEVY

I'm pretty sure that the answer is not at all. It has been awhile, but I think that I was taught not on exhaust as it has a wide span of temperature change.

Also, try http://www.hobartwelders.com/weldtalk/

 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 16197
grumpyvette
Age: 66
Loc: FLORIDA USA
Reg: 03-16-01
01-30-10 08:48 PM - Post#1853195    
    In response to first_stater

  • first_stater Said:
I'm a refrigeration mechanic and have alot of 45% silver brazing rod. It flows at around 1200 degrees I think. Could I use this for my exhaust project??




that silver solder is 4-5 times more expensive to use and weaker than welding rods designed to do the job correctly, with your torch

http://www.amazon.com/Hobart-770514-Copper- Coated-...
" " IF YOU CAN'T SMOKE THE TIRES FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK !"


Edited by grumpyvette on 02-01-10 05:26 PM. Reason for edit: No reason given.

 
bobb 
Super Senior Member
Posts: 4928
bobb
Loc: paradise
Reg: 09-05-03
01-30-10 11:33 PM - Post#1853238    
    In response to first_stater

i never braze exhaust pipes. you can use stick rods if you knock the flux off first.
70 L camino 350 all forged,174 baby blower, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
first_stater 
Forum Newbie
Posts: 80

Loc: Wilmington,DE
Reg: 12-25-09
01-31-10 04:13 AM - Post#1853269    
    In response to bobb

Ok guys. I really want to do the work myself instead of taking the truck to a muffler shop but don't want to do it twice. I think I'll buy some fittings and see how the torch joints look. I might change my mind about getting someone else to do it.
"I refuse to tiptoe through life
only to arrive safely at death..."


 
bobb 
Super Senior Member
Posts: 4928
bobb
Loc: paradise
Reg: 09-05-03
01-31-10 11:09 AM - Post#1853502    
    In response to first_stater

it shouldnt be too hard for you if you can braze. get some straight tubing, cut some pieces and weld them back together. you can use a wire clothes hanger to practice a bit to see if yoou can do it but dont use the hanger for welding. also you need an oxy accetelene torch if you dont have one. or a mig welder.
70 L camino 350 all forged,174 baby blower, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
first_stater 
Forum Newbie
Posts: 80

Loc: Wilmington,DE
Reg: 12-25-09
01-31-10 02:39 PM - Post#1853610    
    In response to bobb

I was watching them on the boob tube today. Looks like they were doing just a bunch of spot welds one after another on butt joints while making headers. Looked pretty straight forward to me. I have a porta-band to make the cuts and access to a welder at work. I'm pretty good with a torch but have never arc welded before. I think I'll do some asking around at work before I try the torch route. I'll really don't want to pay someone to do something that I can do myself.
"I refuse to tiptoe through life
only to arrive safely at death..."


 
bobb 
Super Senior Member
Posts: 4928
bobb
Loc: paradise
Reg: 09-05-03
01-31-10 10:40 PM - Post#1853954    
    In response to first_stater

you can build the pipes in slipjoint sections if needed. muffler placement is the referance point. place your mufflers as far back and high as you can so they will live longer. lay them both on a board so they are even. napa parts can supply many types of mandrel bends in the larger sizes. with and without swaged ends. if you put some effort and time into this i know you can come up with something that will save you hundreds.
70 L camino 350 all forged,174 baby blower, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
Vaughn 
"13th Year" Gold Supporting Member
Posts: 15602

Loc: Colorado Springs, CO
Reg: 08-08-04
02-01-10 06:23 AM - Post#1854036    
    In response to bobb

Brazing shouldn't be used on anything near the exhaust ports, because the exhaust gases run in the 1200-1500 degree F range right out of the exhaust ports. If you use brazing rod on headers, the headers will fall apart.

You need to be at least several feet from the headers to use brazing rod - and it still isn't a good idea to use it anywhere in the exhaust system.

Aluminized steel exhaust systems aren't built using arc welding (arc welding implies that you are using traditional stick welder, and MOST stick welders cannot dial down enough to keep from blowing through the exhaust pipe metal), they are typically welded up using a MIG wire feed welder which will do a much better job. IF you don't have a lot of experience welding, then you should let someone else do it - even if you have a lot of experience brazing. IT is a lot to ask a friend to weld it up for you, because it will take a while to do.

You shouldn't attempt to braze together a system, then pull it out of the vehicle and weld it up with a MIG welder, because the silver brazing will contaminate the steel weld.

Yes, you can do it yourself if you need to - but it is one of those times when it is a lot smarter to let a muffler shop do it.

 
first_stater 
Forum Newbie
Posts: 80

Loc: Wilmington,DE
Reg: 12-25-09
02-01-10 04:51 PM - Post#1854381    
    In response to Vaughn

Thanks guys.
Always great advice here. I know if I take it to a shop and tell them I'm trying to save money, I'll get the truck back (84 C20 BB Sub) and say to myself "crap, I coulda done that!!"
"I refuse to tiptoe through life
only to arrive safely at death..."


 
52chevybob 
Dedicated Enthusiast
Posts: 5628

Reg: 05-27-08
02-01-10 07:25 PM - Post#1854514    
    In response to first_stater

No brazing! The manifold will come apart! Welding is the only way to go. Best is with MIG/TIG welding but you can do torch welding if desired.

 
first_stater 
Forum Newbie
Posts: 80

Loc: Wilmington,DE
Reg: 12-25-09
02-02-10 04:46 AM - Post#1854682    
    In response to Vaughn

Anyone ever use those lap joint band clamps?
I think I could get done what I want to do with clamps but have not had good results with the old style u-bolt clamps in the past.

I've also drawn up on paper what I want to do to take to the muffler shop to get a quote. My biggest problem is the shop with the best reputation is across town and not open on the weekend so I'm not sure how to workout the details. If the numbers work to my advantage I'm sure I'll figure something out.
"I refuse to tiptoe through life
only to arrive safely at death..."


 
bobb 
Super Senior Member
Posts: 4928
bobb
Loc: paradise
Reg: 09-05-03
02-02-10 04:15 PM - Post#1855060    
    In response to first_stater

you mean ss type band clamps that form to the pipe when you install them? they are not for but joints, only for slip joints. the upside of them is if you shlop alot of never sieze in there when assembling you should be able to remove the sections later on. a u bolt clamp will crimp the pipe making it hard to separate. also those band clamps may leak some. probly a good shmutz of silicon in there will cure that.
70 L camino 350 all forged,174 baby blower, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
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