Welding experts

Blink · 17th March 2020, 18:44

A quick question for any welding experts. Is it possible to 'undo' the weld on an exhaust hanger (on a silencer) and re-weld it in a different position?

Typhoon190 · 17th March 2020, 18:58

I'd say you'd need to cut through the weld with and angle grinder carefully so as to not damage the silencer or the hanger, clean back both and re-weld in the new position.

COLVERT · 17th March 2020, 19:02

Blink · 18th March 2020, 13:36

Thanks chaps.

Here's a pic of the box. The vertical rod A needs to be where the red dotted line is.

The weld is fairly chunky - cutting through it without damaging the rim of the silencer (or the rod itself) could be a bit tricky.

Unfortunately, the bottom bend in the rod (point A) needs to be half way along the existing weld (point B) - so the existing weld will need to be ground off completely, without messing up the crimped rim that holds the two halves of the silencer together. Hmm.

Assuming I can get the rod off successfully, what's the best type of welder for putting it back on again?

kaiser · 18th March 2020, 15:33

No, not tricky at all.
Get a 1mm cutting blade on an angle grinder, cut and the thing is off.
Move to desired position, hold, weld.
job done.
5 minutes max for a guy with skills and equipment.

Nothing tricky at all.

You would do this with MIG welding, also known as CO2 welding.
You can also do it with MMA, or arc welding, but that is almost out of fashion.
TIG could be used, but would be a waste of time.
Take it to a local exhaust shop.

Blink · 18th March 2020, 16:37

Quote:

Originally Posted by kaiser

...You would do this with MIG welding, also known as CO2 welding. ...

I'll have to find a local MIG man - the nearest exhaust centre is miles away and I don't have a road legal car (funnily enough

).

On the other hand, maybe I'll take this route instead.

17th March 2020, 18:44	#1
Blink Posted a thing or two Rover 75 Saloon Join Date: Apr 2019 Location: Under the car Posts: 1,840 Thanks: 210 Thanked 244 Times in 221 Posts	Welding experts A quick question for any welding experts. Is it possible to 'undo' the weld on an exhaust hanger (on a silencer) and re-weld it in a different position?

18th March 2020, 13:36	#4
Blink Posted a thing or two Rover 75 Saloon Join Date: Apr 2019 Location: Under the car Posts: 1,840 Thanks: 210 Thanked 244 Times in 221 Posts	Thanks chaps. Here's a pic of the box. The vertical rod A needs to be where the red dotted line is. The weld is fairly chunky - cutting through it without damaging the rim of the silencer (or the rod itself) could be a bit tricky. Unfortunately, the bottom bend in the rod (point A) needs to be half way along the existing weld (point B) - so the existing weld will need to be ground off completely, without messing up the crimped rim that holds the two halves of the silencer together. Hmm. Assuming I can get the rod off successfully, what's the best type of welder for putting it back on again? Last edited by Blink; 18th March 2020 at 13:38..

18th March 2020, 15:33	#5
kaiser This is my second home 75 Tourer 2.5 Auto, 1.8T, 75V8ZT Join Date: Jun 2007 Location: Johannesburg ZA Posts: 6,200 Thanks: 1 Thanked 859 Times in 613 Posts	No, not tricky at all. Get a 1mm cutting blade on an angle grinder, cut and the thing is off. Move to desired position, hold, weld. job done. 5 minutes max for a guy with skills and equipment. Nothing tricky at all. You would do this with MIG welding, also known as CO2 welding. You can also do it with MMA, or arc welding, but that is almost out of fashion. TIG could be used, but would be a waste of time. Take it to a local exhaust shop. __________________ Worth his V8 in gold Last edited by kaiser; 18th March 2020 at 15:36..

17th March 2020, 18:58	#2
Typhoon190 This is my second home MG ZT-T 190 Monogram Typhoon Join Date: Jan 2009 Location: Oxfordshire Posts: 4,707 Thanks: 328 Thanked 557 Times in 443 Posts	I'd say you'd need to cut through the weld with and angle grinder carefully so as to not damage the silencer or the hanger, clean back both and re-weld in the new position.

17th March 2020, 19:02	#3
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts