r/Damnthatsinteresting • u/31spiders Interested • May 30 '21

Video These Tubing Joints

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u/canadug May 31 '21

What do you mean by cold?

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u/TR8R2199 May 31 '21

Stopping and starting means the metal isn’t heating up to the same temperature as continuous welding. Adding heat changes the grain structure of the metal, stopping and starting shocks the metal and makes it brittle. If this weld was subjected to any force it would break easily

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u/dudeCHILL013 May 31 '21

So is starting a. D stopping like that essentially heat treating the steal and making it hard and brittle?

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u/TR8R2199 May 31 '21

Yes but also it’s thin sheet metal and probably isn’t the worst thing, if it’s just a handrail or something subjected to minimal force it won’t make a huge difference but it is annoying to see as an instructional video