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Tool Talk Discussion Forum

Re: S S hot water wood boiler

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Author  [Modern View]

10-05-2013 05:50:17

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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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jon f mn

10-05-2013 08:46:04

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 Re: S S hot water wood boiler in reply to s.crum, 10-05-2013 05:50:17  
What percentage stainless do you suppose is welded using backing gas?

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10-05-2013 10:23:42

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 Re: S S hot water wood boiler in reply to jon f mn, 10-05-2013 08:46:04  
The percentage I would trust...

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jon f mn

10-05-2013 11:42:54

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 Re: S S hot water wood boiler in reply to s.crum, 10-05-2013 10:23:42  
The foreman at a factory I worked at early in my welding career used to like to tell the perfectionist welders that worked there that the best weld is one that meets the criteria for the job. More than that is just more, not better.

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10-05-2013 11:50:28

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 Re: S S hot water wood boiler in reply to jon f mn, 10-05-2013 11:42:54  
Que sera sera. How's that factory doing?

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jon f mn

10-05-2013 11:53:55

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 Re: S S hot water wood boiler in reply to s.crum, 10-05-2013 11:50:28  
Still going strong and it's been 25 years since then. Schlagel Inc. in Cambridge Mn. They did a fair amount of SS food handling equipment there, maybe 25% of the total for the place.

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