galvanized metal patching - The 1947 - Present Chevrolet & GMC Truck Message Board Network

JointTech · 06-02-2014, 08:28 PM

i went to the metal store to get some stock to patch some holes here and there. I got 20gauge galvanized sheet. I couldnt find any non galvanized other than stainless or aluminum.

is it ok to use this? I thought I remembered something about it being dangerous to weld on galvanized?

Livrat · 06-02-2014, 08:42 PM

Here is some reading on the subject.
http://www.sperkoengineering.com/htm...Galvanized.pdf

http://www.aws.org/technical/facts/FACT-25.pdf

JointTech · 06-02-2014, 08:51 PM

hmm good links. so I wonder what you arent supposed to do with galvanized steel?
hmm maybe i was thinking stainless and electrolosis.

**68bowtie** · 06-03-2014, 08:30 AM

i'm not an expert on body work, but i would be hesitant to weld galvanized to bare steel. the properties are different and it could create poor welds or cracking. that and those fumes are no joke, don't mess with them.

*Fitz* · 06-03-2014, 03:11 PM

Quote:

Originally Posted by JointTech

i went to the metal store to get some stock to patch some holes here and there. I got 20gauge galvanized sheet. I couldnt find any non galvanized other than stainless or aluminum.

is it ok to use this? I thought I remembered something about it being dangerous to weld on galvanized?

The Galvanizing coating contains Lead and Zinc. The heat from a welder releases Zinc as Zinc Oxide but the lead is released as Lead Oxide and it as a very toxic gas. Just a little dab will do ya so, no. Welding galvanized metal is not only dangerous, it will shorten your life. Considerably.

Find a steel yard and get some 18 Ga cold rolled sheet.

68Gold/white · 06-03-2014, 03:15 PM

You can weld it. You need to grind the galvanized plating off where it is going to be welded.

I would still look for something else. Try a hardware store. They usually have a rack w/ different sizes and gauges.

72bowtiestepper · 06-03-2014, 03:54 PM

If you have some old sheet metal laying around, such as fenders or hoods from 60's or 70's vehicles, cut your patches from those. I just patched the bottom of my stepside rear fenders with the top parts of old 72 front fenders that had good metal on the top (the bottoms were too far gone to repair). the curves matched the rear fenders perfectly.
Stay away from late model sheet metal though...too thin to work with.

*Fitz* · 06-03-2014, 04:43 PM

Quote:

Originally Posted by 68Gold/white

You can weld it.

Nope. Not me. You weld it if you want to but I won't. I won't even grind on it.

06-02-2014, 08:28 PM	#1
JointTech Registered User Join Date: Feb 2012 Location: Mission Viejo, CA Posts: 1,856	galvanized metal patching i went to the metal store to get some stock to patch some holes here and there. I got 20gauge galvanized sheet. I couldnt find any non galvanized other than stainless or aluminum. is it ok to use this? I thought I remembered something about it being dangerous to weld on galvanized? __________________ 72 C20 Long Bed SB350 TH400 14 bolt rear end Extremely boring build thread

06-02-2014, 08:42 PM	#2
Livrat Member #1049 Join Date: Jun 2000 Location: Troy Montana Posts: 3,940	Re: galvanized metal patching Here is some reading on the subject. http://www.sperkoengineering.com/htm...Galvanized.pdf http://www.aws.org/technical/facts/FACT-25.pdf

06-02-2014, 08:51 PM	#3
JointTech Registered User Join Date: Feb 2012 Location: Mission Viejo, CA Posts: 1,856	Re: galvanized metal patching hmm good links. so I wonder what you arent supposed to do with galvanized steel? hmm maybe i was thinking stainless and electrolosis. __________________ 72 C20 Long Bed SB350 TH400 14 bolt rear end Extremely boring build thread

06-03-2014, 08:30 AM	#4
68bowtie Senior Member Join Date: Jan 2007 Location: Turlock, CA Posts: 8,524	Re: galvanized metal patching i'm not an expert on body work, but i would be hesitant to weld galvanized to bare steel. the properties are different and it could create poor welds or cracking. that and those fumes are no joke, don't mess with them. __________________ I live in California, but identify as a Texan "If a job's worth doing, it's worth doing well" Survivor "Lil’ Mint" (67 c10 40k mile light green original paint) Project "C10 Fever" (68 factory black 396 swb) Project "Little Sister" (70 c10 blue original paint refresh) Project "Blue Bomb" (70 c30 blue original paint refresh) SOLD Project "Vitamin C" (71 c10 orange original paint refresh) SOLD

06-03-2014, 03:15 PM	#6
68Gold/white Registered User Join Date: Sep 2011 Location: Ark City, Kansas Posts: 3,314	Re: galvanized metal patching You can weld it. You need to grind the galvanized plating off where it is going to be welded. I would still look for something else. Try a hardware store. They usually have a rack w/ different sizes and gauges.

06-03-2014, 03:54 PM	#7
72bowtiestepper Registered User Join Date: Feb 2013 Location: Northwest NJ Posts: 684	Re: galvanized metal patching If you have some old sheet metal laying around, such as fenders or hoods from 60's or 70's vehicles, cut your patches from those. I just patched the bottom of my stepside rear fenders with the top parts of old 72 front fenders that had good metal on the top (the bottoms were too far gone to repair). the curves matched the rear fenders perfectly. Stay away from late model sheet metal though...too thin to work with.



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