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Posted by Jon Elson on March 15, 2008, 2:02 am
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rbce2003@hotmail.com wrote:
> I have a project,,, where I am welding a mild steel threaded tube to
> a .106 thick mild steel tab that is about 1" long. The tubing is 3/8
> OD, with .280 ID, threaded 5/16 x 24.
>
> The weld goes lengthwise on the tube, and is the full 1" long.
>
> I am having trouble not distorting the threads in the tube when
> welding. I am tig welding with a 1/16 or 3/32 electrode (sorry, will
> check in the morning for sure... it is the thinnest I have) and 1/16
> (also the thinnest I have)mild steel filler. I am not a weldor, but
> have had some tig and mig formal training.
I know you already have the parts made, but why not drill the
holes in the tube, but don't tap it until AFTER the weld?
Would that do it?
Otherwise, would it be possible to use a brazing alloy to make
the joint? You could still use the TIG machine, but you would
not have to get up to the temperature where the steel softens.
You could also do the brazing with a propane torch.
One last possibility is to pre-heat the parts, either with the
TIG or a gas torch, to the faintest redness, and then make the
weld very fast, with minimum current with the TIG.
Jon
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> a .106 thick mild steel tab that is about 1" long. The tubing is 3/8
> OD, with .280 ID, threaded 5/16 x 24.
>
> The weld goes lengthwise on the tube, and is the full 1" long.
>
> I am having trouble not distorting the threads in the tube when
> welding. I am tig welding with a 1/16 or 3/32 electrode (sorry, will
> check in the morning for sure... it is the thinnest I have) and 1/16
> (also the thinnest I have)mild steel filler. I am not a weldor, but
> have had some tig and mig formal training.