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Re: [PSUBS-MAILIST] welding sheet metal



Hi Dean. That's generally how it's done. Just make sure the metal's clean, has a good fit up, and expect a few pin holes. You might think of gas shielding the back side of the weld, but you still gotta pressure check it for leaks anyway.
When welding thin sheet, it tends to warp a bit, so lots of small tacks. When welding thin sheets into tanks, it's a good idea to use a wet sponge to control the heat to just at the weld area to prevent warping. I just wipe the areas next to the weld beads as I'm going along and it reduces warpage a lot on thin stuff.
Most of your holes will be at the start/stop area. Not much to do here but drill them out after you're done and fill em back in. Are you going to coat the tanks inside, or is it stainless.?
You could use TIG but it's slower.  Frank D.


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