I've patched up a few SS boilers but some I've looked at I refused to touch as previous repairs were attempted. What surprises me is the times a qualified welder has made a weld on stainless without back gassing the weld. Most previous repairs were not back gassed and as such the weld and weld zone were compromised. I quote my price based on doing a back gassed Tig repair. Most times I'm told "well so and so will do it for less", I just say well have at it. Stainless of any grade in a 450 degree or higher temp exposure for extended periods is dicey at best. Welds that are not back gassed typically are considered only 30% as strong as they could be due to carburization (boiling the carbon out of the stainless) on the backside of the weld due to the presence of oxygen. Stainless is a different animal than regular steel or cast in these respects.
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Today's Featured Article - Fire in the Field A hay fire is no laughing matter-well, maybe one was! And a good life-lesson, too. Following World War II many farm boys returned home both older and wiser. One such man was my employer the summer I was sixteen. He was a farmer by birth and a farmer by choice, and like many returning soldiers, he was our silent hero: without medals or decorations, but with a certain ability to survive. It was on his farm that I learned to use the combination hand clutch and brake on a John D
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