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can you weld galv pipe?


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The trick to welding Galv metals is to use a SST welding rod. The SST rods weld beautifully with a very low current and thus far less heat and thus far less destruction of the Galv. The Galv remains intacked right to the edge of the weld and then the exposed metal is SST, so will not rust. But still prime with Cold galv. You still need to grind the Galv where you are going to weld, but keep that to as wide as the weld is going to be and allow the SST to lap into the Galv not ground away.
If you want a great Galv coating, take the finished project to a metal sprayer and have then spray real galv over the welds. The spray can cold Galv are nowhere near as good as the real stuff.

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Used to stick weld 400 gallon galv water tanks when apprentice and we used to just coat the welded corners with cold galv out of the tin.  2 years ago I happend to have a look at one of the tanks up at the Bealey, on the way to the West Coast SI, and the tank is still as good as new, and the cold galv paint shows no sign of rust etc.  50 odd years so far!!!!  Oh and for the toxic affects of the galv fumes boss used to make us drink milk..

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Inhalation of fumes from welding zinc coated steel is called "zinc fume fever"

Symptoms are like a heart attack or crushing bands of pain around the chest, Having experienced it i would suggest avoidance!

Antidote is riboflavin found in milk and beer, Our engineers "award" (remeber those?)

conditions specified a pint of milk per day to be provided when welding zinc coated steel. Oh how the company cafe ladies(remember those?) loved us for claiming the free milk. I think it meant there were no left overs for them to take home.

Beer is also high in Riboflavin though we never did succeed in gettin that into the award!
 

You can grind off the zinc in the haet affected area and you can then apply a zinc metal  rod to the weld while it is still hot enough to melt the zinc and then spread it with a wire brush.

Good luck.

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