|
A welder friend of mine was telling me how he would mix up some diatomaceous earth with water, into a thick paste, and then apply it to the back side of some weldment areas in place of back gassing. The paste was allowed to dry before welding was started. We used to use the diatomaceous earth in are aquarium filters to polish the water. Szybowski From: ShellyDalg@aol.com Date: Thu, 26 Feb 2009 13:59:10 -0500 Subject: Re: [PSUBS-MAILIST] welding sheet metal To: personal_submersibles@psubs.org 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. A Good Credit Score is 700 or Above. See yours in just 2 easy steps! |