how do you tig weld 1 mm stainless steel?

by james wright
(england)

what is the best way to tig weld 1 mm 304 s/s and at what amp ?

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A rule of thumb for welding sheet metal steels and stainless steels is one amp per one thousands of thickness.

1mm is about .040" = 40 thousandths

so 40 amps is in the ball park.

2% thoriated tungsten or 2% lanthanated tungsten in the .063" or 1.5 mm diameter will be the best choices for electrodes.

sharpen it like a needle with a fine grinding stone or sanding disc

use a #7 tig cup with a gas lens

308 L ss filler metal 1mm or 1.5 mm

hope the videos below helps






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how do you tig weld 1 mm stainless steel?

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May 19, 2011
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starstarstarstarstar 		Confused about using other inert gases for back chill blocks
by: Tig Toddler

As usual another twp great videos for the novice here. We just discussed the use of chill blocks in class.

Is there any validity to using anhydrous ammonia as a supplemental shileding gas on the back side?
This is an inert gas that is heavier than air. I have seen this used once in the past. It appeared to work well. I did not see the back ID of the pipe that was welded.

I know that Anhydrous is caustic to brass and or cooper. I saw this used with a homemade SS tube style manifold. Is this an old school trick?

Thanks for the great tips and tricks. Keep up the great work.

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