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TOPIC: inerting gases
#214
inerting gases 1 Year, 6 Months ago  
what are the typical inerting gases for the GTAW process? is nitrogen applicable for this?
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#215
Re:inerting gases 1 Year, 6 Months ago  
typically your garden variety gas is argon for cs,ss,alum.,etc.helium burns a little hotter than argon but it is more expensive we have used nitrogen as backing gas only for chrome moly pipe joints with alot of success
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#218
Re:inerting gases 1 Year, 6 Months ago  
Hi , on the subject of shielding gas I was looking on ebay for mild steel welding wire and came across this:-

ER70S-6 Mild Steel Tig Filler Rods

1.6mm x 2kg Packet



AWS Classification: ER70S-6

You are bidding on 1.6mm x 2kg packet of quality Mild Steel ER70S-6 Tig filler rods. ER70S6 is a mild steel welding wire which contains higher levels of silicon and manganese than other grades of mild steel welding consumables. This rods produces quality weld results even when used on dirty and rusted steel. The high silicon content increases fluid in the weld pool which in turn, yields smooth bead appearance and minimal post weld grinding. This wire is designed to provide quality porosity-free welds at the highest tensile strength of all standard carbon steel wires.

This wire requires a shielding gas such as CO2 or a CO2 mix.


I thought ARGON was the prefered Shielding gas not Co2 and checking out on the internet didnt help??
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#237
Re:inerting gases 1 Year, 3 Months ago  
I think you mean inert gases, not inerting. For Tig, I use Argon for everything...it's truely an inert gas, as opposed to CO2 which is a reactive gas and can pass carbon into a weld.

Argon is a good, all 'round gas. Not cheap, but it can be used for many processes. I keep a bottle hooked up to my tig, and one for the spoolgun on my mig unit. I also use a CO2/argon mix for all my other mig welding, as I get better wet-out. CO2 will give you better penetration, but more spatter. I always use Argon as a backing gas for Al, stainless, titanium, etc. It will help assure a sound weld. If you weld to make money, stick with argon, write it off later.

I'll use an argon/helium mix for Tig welding aluminum using 250amps or over, because the helium will carry a bit more current than argon, thus more heat to the joint. But for most situations, I find 100% Argon is fine. There is a guy on youtube, thought I have no affiliation with him, who has a boatload of great videos with some great information. Welding tips and tricks. Good stuff. But pick up some AWS pubs, and look into the learning resources both Miller and Lincoln have online...you will find a wealth of information that will help you make the right choices for your situation.
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#275
Re:inerting gases 10 Months, 2 Weeks ago  
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#318
Re:inerting gases 10 Months ago  
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