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Old 11-15-2018, 08:00 AM
Metal1 Metal1 is offline
Join Date: Apr 2014
Location: Oregon
Posts: 65
Default Tig question

What size tungsten and cup is everyone using to weld 18 to 20 guage steel? How is the proper cup size figured? Non gas lens.
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Old 11-15-2018, 09:11 AM
billfunk29 billfunk29 is offline
Join Date: Oct 2013
Location: Minnesota
Posts: 258
Default TIG size

I use .o4" or 1/16" tungsten. More likely use the .o4" for tacking. I don't see much variation on gas cup unless I am outside, or by a draft inside. Typically a 3/8" opening. I use bigger pyrex ones(1/2") just because I don't have small ones. I always use a remote pedal.
Bill Funk
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Old 11-15-2018, 08:41 PM
pfreeman pfreeman is offline
Join Date: Apr 2013
Location: Rockford, MI
Posts: 35

This might help:

Good luck
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Old 11-16-2018, 11:50 PM
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Gojeep Gojeep is offline
MetalShaper of the Month March 2015, March 2020
Join Date: Nov 2013
Location: Eastern Melbourne, Australia
Posts: 2,102

For sheet metal I was used the same sized tungsten as the metal thickness. So much easier and less burn through, better heat control and less distortion that way. Cup size I used small to save of gas and you only have a small weld pool to protect.
aka. Gojeep
Victoria, Australia

Invention is a combination of brains and materials.
The more brains you use, the less materials you need.
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Old 11-17-2018, 06:47 AM
sandmanred sandmanred is offline
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Join Date: Nov 2015
Location: Saint Paul, MN
Posts: 175

1/16 tungsten sharp to a point, #5 or #6 cup. About 12 scfm argon. Keep your arc length as short as you possibly can without dipping. If you don't dip occasionally you're probably too far away. And if you have pulse it helps a lot for 16 g and thinner. If you don't have pulse built into you machine I think you'd be able to mimic a low frequency pulse with your foot pedal. I've run as low as 2 hertz on the pulse setting, you could get into that range with some practice using the foot pedal.

And I know you didn't ask but fit up is everything. Best to have edge to edge contact, any gap in a butt weld will promote the edges pulling back instead of fusing. Backers will help if you have spots that just won't fit quite right. I've used aluminum and I've heard people use copper too I think.
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Old 11-17-2018, 08:30 AM
RB86 RB86 is offline
Join Date: Nov 2018
Location: Charlotte NC
Posts: 116

I use 1/16 tungsten, sharp tip and #7 cup at around 18 cfh. 1/16 filler rod works well, but .030 mig wire makes an even smaller joint if you prefer.
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