Tig Collet

i need one tig rod for welding ss material without need to purging gas .i need information about that?

sometimes on site for ss material welding we have,nt access for use purging gas in piping welding ,and i want to know about one tig rod without using purging gas

There are rods with the right diameter to chuck into a TIG collet.

You might consider flux-cored stainless MIG wire, some of which will operate without gas shielding.

MIG Wires can be used with gas shielding (AWS Classes EXXXTX-1 or EXXXTX-4) or without gas shielding (AWS Classes EXXXTO-3). The “-1” indicates CO2 shielding gas, while the “-4” indicates 75% Argon - 25% CO2 shielding gas. Use of EXXXTO-3 with gas will result in high ferrite. Use of EXXXTX-1 or EXXXTX-4 without gas will result in little or no ferrite and possibly porosity.

The alternative is to use stick electrode (rods) coated with a flux to shield the weld puddle - either case will require complete removal of the flux before the next weld pass. Your customer may require removal of the flux on the inside of the pipeline in certain cases - just depends on the job.

I remember using stick electrode in a specific case to weld cast iron parts back together with a flux-coated nickel rod, but the nickel rod would also work on stainless, and retain some corrosion resistance. So, if your weld supplier doesn't have flux-coated stainless rods in-stock, you can use flux-coated nickel rods, unless the weld strength is important to you, but you didn't mention how critical the weld was.

If you don't require full weld penetration, the flux coated rod would chuck up just fine in the TIG torch, and you could prepare the weld joint with a 'V' notch or 'J' notch without attempting to break through. This is OK if you don't anticipate corrosion problems from the unwelded crevice, and the joint is not load-bearing (the notch would be a stress concentrator if a load was applied).

Stainless welding without an inert shield is subject to oxidation, so significant amounts of chromium in the stainless is lost to chrome oxide (the whitish residue), and your stainless corrosion properties will be compromised, so you at least need flux-coated rods, and elevated chrome levels, like 308.

Stainless is so expensive that it would seem that you'd want to go to the trouble to get the best possible weld, even if the inert gas is a pain to plumb to the joint. And, of course, if you decide to use flux-coated or flux-core rods, you need to qualify the weld procedure on samples before doing on the pipeline.

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