back purging mandatory?

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02-16-2006, 10:35 PM

#11

Zeniceguycrx

3.0 BAR

Join Date: Feb 2006

Posts: 3,906

Re: back purging mandatory?

he only welds ss for hospitals and resturants (tables and ---- no heat)

02-16-2006, 10:41 PM

#12

omgcarsrock

0.0 BAR

Join Date: Feb 2006

Posts: 2

Re: back purging mandatory?

Nessecery for tubes

02-17-2006, 06:41 PM

#13

91efate

1.5 BAR

Thread Starter

Join Date: Oct 2004

Posts: 1,183

Re: back purging mandatory?

check this out. its show the difference between a weld with and without back purging, the one thats been purged look sexy

http://sms-products.com/Construction.html

02-17-2006, 08:36 PM

#14

88dx

3.0 BAR

Join Date: Nov 2003

Posts: 5,838

Re: back purging mandatory?

Quote:

Originally Posted by Engloid

I have begun to suspect that the SSAC manifolds are either welded with low quality metal or filler...or maybe filler that's not compatible with the base metal...cause not purging shouldn't cause as many problems as they seem to have.

They brag about having a lifetime warranty. Anybody ever sent one back for repair? I'd be afraid that if I sent my ---- to China for repair that I'd never get it back.

Local friend sent two back to SSauto for warranty that had cracks, I even welded one back up then it cracked again, sent it away back comes a new one.

02-17-2006, 09:04 PM

#15

LSD Motorsports

Banned

Join Date: Aug 2003

Posts: 2,898

Re: back purging mandatory?

Quote:

Originally Posted by 88dx

Local friend sent two back to SSauto for warranty that had cracks, I even welded one back up then it cracked again, sent it away back comes a new one.

Thats a pretty cool deal, send out ---- and back comes ----, im just dissapointed fed ex / ups / xxx carrier are willing to carry ---- in their truck. They should reroute it back to the 11 yr old who welded it.
Backpurging isnt 100% necessary for something to last. However as you see in the picture, it does create a smoother more uniform weld and theres nothing wrong with that if you have the tools to do it.

02-22-2006, 01:27 AM

#16

fastcivicboy

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Join Date: Mar 2003

Posts: 571

Re: back purging mandatory?

Quote:

Originally Posted by weiRtech

i'd say back purging isn't nescassary for a log mani or a short tubular manifold because you don't need full penetration on your welds. but i'd recommend it for something like a top mount or ramhorn style manifold as there are a lot more break points and a lot more weight. if i get a chance i'll post up my back purge setup later with a small writeup.

You can still get full penetration w/o backpurging.

02-22-2006, 11:32 PM

#17

Skuce

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Join Date: Mar 2005

Posts: 106

Re: back purging mandatory?

What kind of equipment is used to do a backpurge weld?

02-23-2006, 12:32 AM

#18

LSD Motorsports

Banned

Join Date: Aug 2003

Posts: 2,898

Re: back purging mandatory?

Quote:

Originally Posted by Skuce

What kind of equipment is used to do a backpurge weld?

You just need another argon tank and a line of some sort to run into the area your welding. They sell little fixtures for holding the line exactly where you want as well.

02-26-2006, 01:05 AM

#19

Engloid

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Join Date: Jan 2005

Posts: 278

Re: back purging mandatory?

Quote:

Originally Posted by fastcivicboy

You can still get full penetration w/o backpurging.

You could penetrate your girl's ----- with a razor knife, but penetration isn't just penetration.

02-27-2006, 05:18 PM

#20

Weldstyle

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Join Date: Feb 2006

Posts: 16

Re: back purging mandatory?

You don't need to backpurge if your using sch10 304 stainless piping. The material is so thick that it won't crack even if you get only 75% penetration. It will make it look nice on the inside and it is the right way to do it but its not needed. The SS auto manis are garbage because they use thin wall exhaust tubing and then mandrel bend it, making the bends even thinner. That with no support brackets on the turbo cause it to break or crack.