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| | | | Joined: Aug 2018 Posts: 760 'Bolter | | 'Bolter Joined: Aug 2018 Posts: 760 | I need to do some welding on some pretty rough sheet metal, and I would like to treat it with Ospho first. Are there any problems, issues, special precautions, etc. involved with plug welding some places on some sheet metal treated with ospho?
Mike Burns
1940 Chev 1/2 ton
1953 Chev 1/2 ton
1950 Studebaker Starlight Coupe
1947 Indian Chief
1943 Indian 741
| | | | | Joined: May 2015 Posts: 11,067 Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums | | Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums Joined: May 2015 Posts: 11,067 | I wouldn't bother with Ospho treating before welding. It doesn't make sense, and it would just burn the Ospho off anyway. Treat after welding.
Kevin 1951 Chevy 3100 work truckFollow this saga in Project JournalPhotos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together. | | | | | Joined: Mar 2014 Posts: 4,491 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,491 | Good question. You know what ospho is, yes? OrthophOSPHOric acid...I know the claim is that it goes inert in a while, but I don't know what they mean by a "while". I'll be curious to hear what others think. I believe you'd be safer with oxy-acetylene (fewer fumes) but I realize I'm one of a dying few still using that system regularly.
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
| | | | | Joined: Jan 2017 Posts: 124 Shop Shark | | Shop Shark Joined: Jan 2017 Posts: 124 | I suspect the ospho will not make a good, if any electrical connection. In a couple of places on my rusty 38 cab where I did a few plug welds with the mig I used some weld through primer which seemed to work ok, and in theory has sealed the surfaces in between. Just $.02 from a jack of all trades master of non type.
38 Chevy 1/2 ton being resto-moded
65 AC Cobra replica
USAF vet
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