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Post subject:t.i.g gas
 Posted: Jun 27, 2006 - 03:24 PM #4964
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Power User
Joined: Sep 03, 2003
Posts: 171
Location: edinburgh
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| Does anyone t.i.g weld mild steel ,if so what shielding gas do you use ?,i have tried it with argon and also argoshield universal but always get porosity .any help guys .thanks Marky |
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Post subject:RE: t.i.g gas
Posted: Jun 29, 2006 - 03:04 AM #4973
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Power User
Joined: Feb 19, 2006
Posts: 131
Location: Texas
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| I haven't done much TIG in the last 6 years, but I think I welded some mild steel once using argon just to see how it looks. When you say mild steel, you're not talking galvanized right. I know the galvanized stuff I tried ended up with holes. On black you might get different results with a plasma cut as opposed to a sheared cut(because of the slag). I'm not really a "welder" but these are my thoughts. |
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Post subject:RE: t.i.g gas
Posted: Jun 29, 2006 - 04:15 AM #4976
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Power User
Joined: Dec 14, 2004
Posts: 199
Location: Illinois
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Argon is for aluminum in the TIG process.
For mild steel or stainless, try 75/25 CO2/Argon mix. |
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Post subject:RE: t.i.g gas
Posted: Jun 29, 2006 - 04:28 PM #4980
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Power User
Joined: Sep 03, 2003
Posts: 171
Location: edinburgh
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| Thanks ive borrowed a bottle and will give it a try.Marky |
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Post subject:RE: t.i.g gas
Posted: Jul 02, 2006 - 11:47 AM #4988
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Power User
Joined: Dec 14, 2004
Posts: 199
Location: Illinois
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It should work much better for you. Don't be afraid to ask your welding supplier for advice on what to use for different processes, materials and positions. Odds are, they know.
I MIG welded plenty of black iron with argon at one company- which is wrong. The result is weld porosity using standard short circuit transfer welding plain old black iron (steel sheet). The boss would not get me the right stuff until he finally asked the welding supplier like I asked (repeatedly). I could see the holes in the weld as I made the bead (the top smoothed over).
They had been "doing it that way since they bought the machine" and would not listen to me. I was going through a certification course for MIG at the time (which I passed).
One day, a fresh bottle of C25 showed up and the black iron welds were much, much better 
Good thing I didn't have to warranty that other stuff....
The C25 is what you need (I got the gas percentages mixed up above). Works for both short circuit MIG (black iron- you can also use straight CO2) and TIG (black iron and stainless). |
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Post subject:RE: t.i.g gas
Posted: Jul 02, 2006 - 12:06 PM #4989
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Power User
Joined: Dec 14, 2004
Posts: 199
Location: Illinois
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Damn- missed the edit window.
Straight Argon will work just fine for TIG welding mild steel and stainless.
So confusing sometimes. |
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Post subject:RE: t.i.g gas
Posted: Jul 03, 2006 - 04:40 AM #4990
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Power User
Joined: Feb 19, 2006
Posts: 131
Location: Texas
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| So danski0224, did I probably TIG black iron using straight argon? It's been a while. We kept straight argon, straight co2, 75% argon/25% co2, and tri-mix which was argon co2 and helium. It's hard to keep it all straight. We were a general sheet metal shop and did all welding processes. Now I'm in an HVAC shop exclusively and MIG almost everything. |
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Post subject:RE: t.i.g gas
Posted: Jul 03, 2006 - 09:31 AM #4991
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Power User
Joined: Sep 03, 2003
Posts: 171
Location: edinburgh
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| Thanks for all the help i eventualy went for a gas called stainshield tig which is a boc gas ,different gasses have different names this side of the pond ,again thanks for the help .aw ra best Marky |
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Post subject:RE: t.i.g gas
Posted: Jul 15, 2006 - 03:33 AM #5013
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Joined: Mar 09, 2005
Posts: 15
Location: Canada
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100 % Argon is used for T.I.G welding (GTAW).
-Using a Helium mixture adds the extra heat.
One thing that was missed in the previous comments was the type of Tungsten being used on the particular base metal. Pure Tungsten or Thoriated Tungsten.
As well as check your polarity settings...Straight -Polarity (DCSP) or Reverse-Polarity (DCRP).
** Tip ** when welding galvinized to advoid mu8ch sparks and "splatterin" grind or sand off the zinc coating. Use a filler rod ( here we call Epiderm ) that is specificaly used for galvanised. This rod can also be purchased for Mild steel (which works GREAT !!) There is specific type for various metal alloys. |
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