Galvanizing-friendly MIG wire. - Defender Source
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Old September 18th, 2014, 11:43 AM
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Galvanizing-friendly MIG wire.

I am going to be spending some quality time with a MIG in the next month. I recall someone (Matt Browne I think) posting about MIG wire that is less prone to reacting when galvanized, so that welding can be better hidden. Anyone recall what type it was? The local welding guys don't have a clue.

Thanks...

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  #2  
Old September 18th, 2014, 11:50 AM
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You need to clean down to clean/bear metal, no such animal as Galvie friendly wire. But I maybe wrong.
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Old September 18th, 2014, 11:55 AM
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ER70S-6 is a good choice.

Beware--the fumes are EXTREMELY toxic---wear a respirator. I have gotten very sick before breathing in a small amount of fumes.

Best choice is to grind entire area off--even so, the Zinc can be drawn into the pool--just not a good combination. Wear the damn respirator.
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Old September 18th, 2014, 12:04 PM
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er70s6 is standard for mild steel. no wire is going to be better for welding galved metal short of removing the galv from the weld area. not sure what you mean by hiding the weld. short of tig, that is fiction
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Old September 18th, 2014, 12:09 PM
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You should remove the zinc first as it contaminates the weld. If you must, then you need to have supplied air. Breathing the fumes is a bad thing....

https://www.osha.gov/doc/outreachtra.../weldhlth.html
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Old September 18th, 2014, 12:13 PM
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Edit: Sorry, I wasn't clear. I am talking about welding steel before galvanizing, so as to minimize "coating growth", where the zinc gets deposited thicker on top of welds than on the parent metal and makes welds appear even though they are ground flush.

I found Matt's advice in an old thread on here:

"It is still better to use high silicon wire if mig welding as the zinc will have a high build on regular wire....as in if you grind anything flush the weld will show through"

However, everything I found online says to use low silicon wire, or wire that has a similar silicon content to the base metal, since silicon actually attracts zinc and will cause a higher deposition rate on the metal.

http://www.galvanizeit.org/images/up...lded_Areas.pdf

I think Matt may have just gotten in backwards in his post.

I think ER70S-2 or S-3 is likely what I want.

Anyone else have experience with this? Not so much an issue unless you are making butt joints or lap joints that are ground flush.
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Old September 18th, 2014, 12:14 PM
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I believe he is talking about welding before galvanizing.
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Old September 18th, 2014, 12:18 PM
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Quote:
Originally Posted by roverman2010 View Post
You need to clean down to clean/bear metal, no such animal as Galvie friendly wire. But I maybe wrong.
I think he means PRIOR to galvanizing, but yes you are correct.
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