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TopBud
Samba Member
Joined: February 28, 2004
Posts: 1111
Location: Flagstaff AZ
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 Posted: Tue Jun 02, 2009 10:38 am Post subject: galvanized? |
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Howdy guys. I am new to body work and am tackling a project. I have a 65 panel and it needs a patch welded in. From research and posts here, people recommend 20 gauge steel. I am able to only get 20 gauge galvanized steel here in FLagstaff, Az. Would that work? or should get another gauge "black steel". I did do a search and what I found was a bunch of yes you cans and no you can'ts.
Thanks a ton in advance.
Or does anyone know of a supplier that would ship a piece of 20 gauge steel to me. It needs to be about 24in. x 24 inches.
Tony
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86 bostig SYNCRO
66 convertible Karmann Ghia |
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gfw1985
Samba Member
Joined: December 24, 2003
Posts: 948
Location: Raphine, VA
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| Posted: Tue Jun 02, 2009 11:16 am Post subject: |
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| Galvanized steel gives off toxic fumes when welding. 20 gauge metal can be found at Lowes, Tractor Supply, you get the picture. Buy a cheap metal gauge and measure what you are repairing. Won't get into an argument about what most VW sheetmetal is. |
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busman78
Samba Member
Joined: August 17, 2004
Posts: 4520
Location: Oklahoma City, OK
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VeroDubs
Samba Member
Joined: January 23, 2006
Posts: 653
Location: Vero Beach, Florida
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| Posted: Tue Jun 02, 2009 2:34 pm Post subject: |
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| gfw1985 wrote: |
| Galvanized steel gives off toxic fumes when welding. 20 gauge metal can be found at Lowes, Tractor Supply, you get the picture. Buy a cheap metal gauge and measure what you are repairing. Won't get into an argument about what most VW sheetmetal is. |
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I found this out last night while learning to weld on a bunch of scrap metal a guy gave me.  There was a couple pieces of galvanized steel in there. Not only does it give of fumes, but there is a white stringy residue left when done welding. And you get some horribly ugly welds !!! |
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TopBud
Samba Member
Joined: February 28, 2004
Posts: 1111
Location: Flagstaff AZ
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| Posted: Tue Jun 02, 2009 2:34 pm Post subject: |
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Thanks guys. It looks like I will not be using galvanized steel and will be getting some from the local hardware shop.
Thanks
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86 bostig SYNCRO
66 convertible Karmann Ghia |
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Buttafuoco
Samba Member
Joined: June 23, 2008
Posts: 263
Location: Nor*Cal
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| Posted: Tue Jun 02, 2009 8:31 pm Post subject: |
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| gsusmaniac wrote: |
| gfw1985 wrote: |
| Galvanized steel gives off toxic fumes when welding. 20 gauge metal can be found at Lowes, Tractor Supply, you get the picture. Buy a cheap metal gauge and measure what you are repairing. Won't get into an argument about what most VW sheetmetal is. |
\\
I found this out last night while learning to weld on a bunch of scrap metal a guy gave me. There was a couple pieces of galvanized steel in there. Not only does it give of fumes, but there is a white stringy residue left when done welding. And you get some horribly ugly welds !!! |
The "ugly" welds you are talking about is due to your speed and voltage setting when you are welding Galvanized( assuming you're MIG welding it) .Due to the relatively low melting point of zinc a proportion of the coating is volatilised and given off as a white zinc oxide fume. The presence of any fume evolved is obvious and this permits simple observation of the efficiency of the ventilation or extraction system.
When welding is carried out in accordance with normal
industrial practice with provision for adequate ventilation and air circulation, the non-toxic zinc fumes will cause no inconvenience. If adequate ventilation is not available supplementary ventilation using air extraction equipment or forced air circulating equipment should be provided.
Although welding fumes from galvanized steel are not toxic,
operators welding in a confined space should always be
provided with suitable respirators to minimise possible
discomfort. Fume development and consequent coating
damage may often be minimized with certain joint designs in
flat sheet by the use of copper chill bars. The chill bars are used as a backing strip or clamped on the weld side of the joint to absorb some of the heat generated during welding. |
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