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peppiB
Joined: 30 Jun 2008 Posts: 686 Location: Newcastle upon Tyne
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Posted: Mon Sep 21, 2009 3:54 pm Post subject: Gas welding |
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Just curious. At the last MOT on my Minor, the tester commented that he would have preferred to have seen a chassis leg gas welded in one particular place instead of mig welded (just aesthetically more in keeping with the age of the car). Whilst I can mig weld I cannot gas weld so asked a local garage. They informed me that gas welding is now illegal Anyone know if this is correct? I do know there are stringent regulations on storage of the cylinders but was not aware of any restrictions being placed on its use in relation to motor vehicle repair - and obviously the MOT tester wasn't aware of them as he wouldn't have made his comment. |
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Uncle Alec
Joined: 14 Jan 2008 Posts: 734 Location: Manchester
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Posted: Mon Sep 21, 2009 4:14 pm Post subject: |
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As I understand it the problem arises with the use of the more modern steel alloys that are not at all responsive to gas welding; they are only suitable for resistance or spot welding. But it wouldn't affect any cars of our members would it? Any metallurgists out there? |
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Jim.Walker
Joined: 27 Dec 2008 Posts: 1229 Location: Chesterfield
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Posted: Mon Sep 21, 2009 5:17 pm Post subject: |
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I'm not an expert, but I do know that the filler rods commony used for gas welding (eutectic) are intended for repairing mild steel.
The rods chosen for any job should reflect the material they are used on and if the job is an alloy steel then eutectic rods are not suitable.
A firm called Barrymar (are they still around?) used to weld anything and guarantee their work, but I think they removed surplus metal from some part of the job to make filler rods.
I still have nightmares about a school friend who was injured severely when his bike collapsed on a level crossing because some well meaning person had repaired his bike frame with unsuitable rods.
As to gas welding being banned on cars - I have no idea. Nor do I have any idea of the limitations of filler wire used with MIG welders. I don't do MIG. _________________ Quote from my late Dad:- You only need a woman and a car and you have all the problems you
are ever likely to want". Computers had not been invented then! |
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ukdave2002
Joined: 23 Nov 2007 Posts: 4127 Location: South Cheshire
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Posted: Mon Sep 21, 2009 7:12 pm Post subject: |
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I seem to remember being told not gas weld modern car panels, reason being that they are thinner (to keep weight down ) but steel used has a higher tensile strength than older panels, the extra heat from gas welding could temper the steel which could affect the body strength. |
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rustyreks
Joined: 12 Mar 2008 Posts: 44
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Posted: Thu Dec 17, 2009 11:10 am Post subject: WELDING MIG OR GAS |
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Mig wire is high tensile so it is strong but not malleable whereas gas
welding on car panels is mild steel and panel beats well both have there
place i use mig, gas is good but produces alot more heat so more
distortion to panels compared with mig. |
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weldingclassics
Joined: 11 Jan 2010 Posts: 7
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Posted: Tue Jan 12, 2010 9:41 pm Post subject: |
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I reckon the mot tester was having a jobs worth moment!! If the welding was carried out nicely with a mig he wouldnt have mentioned it! any way gas is only used these days to harden and temper your chisels!lol |
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buzzy bee
Joined: 23 Nov 2007 Posts: 3382 Location: South Cheshire
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Posted: Tue Jan 12, 2010 9:56 pm Post subject: |
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Hi
If he saw my mig welding, he would want everything migged! hehe I got compared to robotic welds the other day! haha
Cheers
Dave |
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Penman
Joined: 23 Nov 2007 Posts: 4766 Location: Swindon, Wilts.
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Posted: Tue Jan 12, 2010 10:36 pm Post subject: |
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Hi
buzzy bee wrote: |
I got compared to robotic welds the other day! haha
Dave |
Well you wouldn't be compared with Tuesday Weld would you.
http://www.imdb.com/media/rm2191497216/nm0001839 _________________ Bristols should always come in pairs.
Any 2 from:-
Straight 6
V8 V10 |
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Jim.Walker
Joined: 27 Dec 2008 Posts: 1229 Location: Chesterfield
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Posted: Tue Jan 12, 2010 11:13 pm Post subject: |
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Well. Now I know who Tuesday Weld is, but I do not know who Robotic Welds is! _________________ Quote from my late Dad:- You only need a woman and a car and you have all the problems you
are ever likely to want". Computers had not been invented then! |
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buzzy bee
Joined: 23 Nov 2007 Posts: 3382 Location: South Cheshire
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Posted: Tue Jan 12, 2010 11:37 pm Post subject: |
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