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Welding body sheet metal with an arc welder

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t_tuffnut Wolfsburg Wizard

425 posts · joined Jun 2009 ·

#775994
Just after some advice,

I've got a hole to patch under the tank of my bug, on the opposite side to the master cylinder (if that makes sense - passenger footwell but under the tank) and I have access to an arc stick welder (home handy man size).

I've been cautioned before about welding body sheet with a stick, but I was wondering if it was possible?

The hole is about the size of a matchbox car, and doesn't go through to the interior. It has been cleaned up, treated and painted in a rust proofing paint.

I was going to try and get my eye in on some old scrap panels I've got. Just wondering if it is possible, or if it will blow holes in the steel?
1966 Bug

1973 L Bug

bajachris88 The international telephone dialing code for Antarctica is 6

6,661 posts · joined Apr 2005 ·

#776004
Hmm.... good challenge. I can burn holes through exhaust tubing on my little 100amp arc/stick welder at home.

U would wanna be very quick in making an arc and welding it before it can get to much heat into it, not only for hole burnage but also distorsion and of course with the output cracked far down.

If it mucks up it will only be a couple little holes. no worse really. I'm sure if u put a thread up asking for any veedubber with a mig nearby you should be able to get help.
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4,674 posts · joined Aug 2002 ·

#776012
It is possible, but you would want to be very good at using the arc welder to do sheet metal repairs
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greedy53 Bishop of Volkswagenism

3,062 posts · joined Mar 2006 ·

#776019
long ago i welded 1mm-2mm sheets but they had a welding rod that was carbon ,coated with copper ,i haven't seen one sinrce it was an early tig i suppose
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LUFTMEISTER Veteran Volks Folk

2,041 posts · joined Jul 2005 ·

#776022
your sheet steel is about 1-1.2mm,your thinnest welding rod is I think 2mm. so by the time the rod melts,you have blown a hole in your sheet steel. Good Luck😉
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pod i`ve got to finish this thing one day

4,980 posts · joined Dec 2003 ·

#776025
you would need 1.6 rods and amps turned down low,it can be done as i used to do it before i got my mig,and greedy you were doing carbon arc welding👍
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grumble Son of Jim - Creator of Good

2,672 posts · joined Jun 2008 ·

#776030
Mate the hole is the size of a matchbox car,by the time you get enough oyster leases on it you will probably be able to put the spare wheel in there.Either use oxy a mig or pay someone else to do it.Good luck

jsheppard64 Officially Full-On Dubber

323 posts · joined Mar 2008 ·

#776034
we patched up our pillar with the hole size of a tennis ball
using sheet metal from old computer case but to the size of the hole and 1.6mm welding rod
we just sort of spot weld it about 5 mm apart.
and fibreglass over it

STIDUB Over it.

1,497 posts · joined Jun 2008 ·

#776039
get a 240v TIG welder, much easier for light gauge stuff, think of it kinda like an electric version of oxy (im a lil biased tho, i love TIG)
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71-BEETLE-SEDAN AKA Josh

1,058 posts · joined Mar 2009 ·

#776043
Tig is nice looking.

You could sell your stick and but a unitig welder which has both stick and tig options. They are medium size but dunno bout cost

t_tuffnut Wolfsburg Wizard

425 posts · joined Jun 2009 ·

#776055
Yeah, might just see about hiring a mig. I'm a bit handier with them at any rate.

The stick welder I was going to borrow was a pretty old one, and I don't think it would crank down that low.

Thanks for the advice.
1966 Bug

1973 L Bug

t_tuffnut Wolfsburg Wizard

425 posts · joined Jun 2009 ·

#776056
Just looked it up - it's only $44 for 4 hours to hire a 130amp mig from Kennards.

Too easy!
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1973 L Bug

silver Dangerous when poked

2,169 posts · joined Dec 2002 ·

#776057
buy a mig from bunnings use it and return it for a refund stating it is not of a quality you require
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1,418 posts · joined Mar 2005 ·

#776061
71-BEETLE-SEDAN wrote:Tig is nice looking.

You could sell your stick and but a unitig welder which has both stick and tig options. They are medium size but dunno bout cost
140 amp around $340 but that doesn't include the TIG torch or argon gas bottle/hire. A great little welder!

DH

polak Everything is alright with enough Vodka :P

913 posts · joined May 2009 ·

#776068
pretty hard to do and a pain in the ass, but i did once weld a rust hole up in a HR holden bootlid with one, not to mention the passenger quater on my bug, before i got a mig, so yes its possible, but be expecting to grind a fair bit... lol


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jacky_moo Seriously Crusin Dubber

115 posts · joined Feb 2010 ·

#776198
I work in sheetmetal and yeah deffo go for a mig... its a shame your not in melbourne ive got hmmm.. bout 30 to play with haha
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HappyDaze Superannuated

2,887 posts · joined Jun 2009 ·

#776209
I know that it's a bit "old school", but what about oxy-acetylene welding? Having worked on VWs (at a VW dealership) in the '50s & '60s, that's all we had - no MIG or TIG.
With a small tip, 20 gauge (0.9mm) steel can be welded neatly. The main downside is extra heat in the surrounding areas. I have both MIG & TIG in my shed, but still use the oxy for a lot of welding as well. I'd rather pick up a black snake than a stick welder.

Cheers, Greg
I'd rather wear a Beetle out by racing it than by polishing it!

grumble Son of Jim - Creator of Good

2,672 posts · joined Jun 2008 ·

#776221
I agree with Greg,oxy may be old school but we had nothing else (we were too poor)😂so everything was welded with oxy,my first boss could weld anything short of toilet paper and did so.Seriously though with a No 6 tip on a comet set up we welded 1/2 skins on doors or whatever because there was nothing else.The first bloke that came around selling migs was stunned when we did a better job on a panel repair in less time than he did with the mig,needless to say he didn't make a sale.Obviously this came with a lot of practice but these days the mig is the way to go.

greedy53 Bishop of Volkswagenism

3,062 posts · joined Mar 2006 ·

#776277
just an idea, what about using the 2 part sot metal, if the holes are only very tiny you pinch a bit of kinda like putty you knead 2 parts together and use it you can file it sand it drill it etc
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HappyDaze Superannuated

2,887 posts · joined Jun 2009 ·

#776280
Oh yeah, and leave a nice surprise - and more work - for the next bloke, who wants to do the job properly!
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helbus Administrator Mad fabricator, paint and body

7,386 posts · joined Sep 2002 ·

#776339
grumble wrote:I agree with Greg,oxy may be old school but we had nothing else (we were too poor)😂so everything was welded with oxy,my first boss could weld anything short of toilet paper and did so.Seriously though with a No 6 tip on a comet set up we welded 1/2 skins on doors or whatever because there was nothing else.The first bloke that came around selling migs was stunned when we did a better job on a panel repair in less time than he did with the mig,needless to say he didn't make a sale.Obviously this came with a lot of practice but these days the mig is the way to go.
I do all my panel fabrication and repair with oxy. You cant metal finish a MIG weld.
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amazeer Bishop of Volkswagenism

3,029 posts · joined Nov 2005 ·

#776391
I could once weld anything with a stick, I could do it flat, vertical, even overhead to a degree. So long as the anything is 2 bits of brand new 3/8 plate set up securely on a bench. At TAFE they only taught us BHP fitters how to weld 3/8 plate and the boiler makers back at work wouldnt let us go anywhere near their gear. These days I could probably cut 1/4 inch plate with a stick as neatly as I could cut it with oxy. Which doesnt say a lot for my skills at either.
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