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EXTERIORS & BODY REPAIRS Bring your beloved back to its former glory - or just polish the chrome some more!

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  #1  
Old 28th May 2008, 01:25 AM
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s class s class is offline
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Default MIG weldng sheet steel

Stupid question - when patching rust holes with new steel, what is the preferred thickness of sheet to buy? I presume it must be hot-rolled.
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  #2  
Old 28th May 2008, 04:42 PM
John S John S is offline
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Default Re: MIG weldng sheet steel

To avoid any concerns go to a wreckers and buy a similar panel off the same model yours is. It doesn’t matter if the panel is rusted or scraped, as you cut out only what you need from a good section - cheap and the thickness will match.
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Old 28th May 2008, 05:38 PM
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Default Re: MIG weldng sheet steel

Hi Sclass, I think the thickness I use is 16g for panels but structural places I use thicker, but as I say im not sure of the specs , I just look at the steel and know if ive got right one in my hand or not.....I also use steel that has a protective coating on it, I can leave it outside bare for months and it doesnt corrode
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Old 29th May 2008, 01:11 AM
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Default Re: MIG weldng sheet steel

Thanks to both of you. John, that is an excellent suggestion, but in this case I the piece i need is half the size of my hand on the rear of my W140, and I will need to buy the entire rear half of a bodyshell to get that. Too expensive.
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'80 W116 280SE euro - the ride
'76 W116 6.9 euro - trusty rusty
'78 W116 6.9 euro - the AMG
'74 W116 350SE euro - the stand-in ride
'82 W126 500SEL euro - full hydraulics - the limo
'83 FORD XR3 - the beast

0 benzes on stands, 5 RUNNING
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  #5  
Old 29th May 2008, 04:10 PM
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Default Re: MIG weldng sheet steel

Ryan,

Are you good with a MIG?

I would watch you on-board electronics carefully.

Bill
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Old 29th May 2008, 06:03 PM
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Default Re: MIG weldng sheet steel

You can use a 16g or 20g depends on where you are welding.
Any decent piece of steel you have lying around from a wrecked benz would do.
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Old 29th May 2008, 06:38 PM
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Default Re: MIG weldng sheet steel

THanks Bill. I have posted a query on Benzworld about what precautions I should take before MIG-ing on a W140. So far no real concerns have been raised.
__________________
'80 W116 280SE euro - the ride
'76 W116 6.9 euro - trusty rusty
'78 W116 6.9 euro - the AMG
'74 W116 350SE euro - the stand-in ride
'82 W126 500SEL euro - full hydraulics - the limo
'83 FORD XR3 - the beast

0 benzes on stands, 5 RUNNING
Reply With Quote
  #8  
Old 5th August 2008, 08:23 PM
JoeB
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Default Re: MIG weldng sheet steel

I've heard stories of welders killing ECU's but never seen it happen. I do know that the HF start on many TIG welders will fry any sensitive electrical gear, but since you are using a MIG, it more than likely doesnt have a HF start and you should be fine.

Never hurts to be careful though! 10 minutes of disconnection and removal of expensive bits might save you a small fortune, even if it only gives you piece of mind. (insulate the battery cable clamps- dont leave them touching the chassis)
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