Tig code 141????

[backpurge]

You would add around 2% nitrogen to argon when welding duplex, as Brad says it promotes austenite formation, you will also find it increases the heat of the weld pool without increasing your welding current so you can travel faster which brings the heat input down, another good thing when you’re welding duplex but I can’t see any benefit to using it on inconnel type materials

As said above we sometimes add oxygen to argon or argon/helium mixes for MIG and TiG welding ally (between 2 and 5 ppm) as it helps focus the arc but I wouldn’t have thought the amount was enough to reclassify the mix as active

 

[backpurge]

Question.
Is 147 TAG, Tig Active Gas, a completely different process or would this be a technical way to describe an Argon &Helium mix tig that produces a hotter arc?

This is where it gets a bit “anoraky” I suppose the only time when it would really be truly TAG welding as opposed to TIG is when you are using an argon/hydrogen mixture (which is great on austenitic stainless), you could argue the point that nitrogen is active in certain circumstances but it is also inert in other circumstances

 

[Wonderweaver]

Ok anorak time --we have taken the red pill ,no going back. This is my understanding of the gas matrix:
Argon is used primarily because of its inactive low ionization it takes less energy to become conductive--18 electrons. So at 100amps you'll be running less voltage to produce an arc than a gas with might contain an Argon/ Helium mix. Helium has two electrons so requires a higher voltage still at the same 100amp to become thermally conductive . Therefore a arc of higher voltage and a hotter arc is produced. Same thing as co2 with mig.
So as you know the puddle will have less surface tension and you 'll be able to weld quicker. With mig this has an effect on bead height to a greater extent and the reason for increased spatter with CO2 . That's about are far as I've gone with gas ,I know as you say other gases promotes different chemical composition and preferable forming of a particular alloy. The Argon / nitrogen mix well done for spotting that was a mistake made from producing an in house welding procedure. Probable made from either an over zealous welding engineer--that couldn't weld or improper tecniques ,bad gas ,poor skill etc . It was thought that the nitrogen mix gas produced less porosity but in actual fact it had negligible effect and was generally a nightmare. They developed a new wps with a more weldable gas and the original porosity issues were not evident. Did you know that the 147 Tag is also called Tarka welding?

 

[davidjohnperry]

Ok staying on topics of codes which I have now re learnt thanks to everyone. I know you need a wps to have a code which you need to use to keep (in basic) soooooo what counts as a get foot In door code that does not cost me 500 pounds a day for training and one test or is that the going rate these days

 

[Wonderweaver]

Ok staying on topics of codes which I have now re learnt thanks to everyone. I know you need a wps to have a code which you need to use to keep (in basic) soooooo what counts as a get foot In door code that does not cost me 500 pounds a day for training and one test or is that the going rate these days

David lots of people have said about the codes. They do not last and why spend money on them. If you go for a job and they test you then it might be a 3g or a 6g . Is their anyone on the forum willing to train him .I think @richard does training?? This will be best for your confidence and getting your skills up.

 

[davidjohnperry]

I think that may be the case @bR39Da it's probably worth me clearing my jobs at the work shop buying some material and get on with practicing and testing out till I can get a good years worth of my own work

 

[davidjohnperry]

David lots of people have said about the codes. They do not last and why spend money on them. If you go for a job and they test you then it might be a 3g or a 6g . Is their anyone on the forum willing to train him .I think @richard does training?? This will be best for your confidence and getting your skills up.

I miss read one of the posts @Richard. Ment gain skills or quals from other firms to slap on the c.v do apologize

 

[davidjohnperry]

2f multi pass spray day job do 12fws to 18fws with min effort
3f v up don't do a lot of but with some practice should be good
2f MMA should be no issues
I'll clear my work in the next few weekends and get some practice coupons
Cheers for that information @bR39Da that is a solid platform to work off

 

[TechnicAl]

They class that as active in the states. Here I’m not so sure.

Like you say another is hydrogen. That is an active gas.
Really anything not using a noble gas could be classed as active.

Yeah Inconel and nitrogen gas I don’t really understand. Most Inconel alloys are ~60% nickel so austenite formation is not usually an issue. Maybe it was an overlay onto a low alloy steel?

Nitrogen and Nickel are strong austenite formers, Molybdenum and Chromium are ferrite formers.

Never heard of adding Nitrogen to shielding gas for Nickel Alloys......you are usually trying to exclude Nitrogen

https://www.twi-global.com/technical-knowledge/job-knowledge/welding-of-nickel-alloys-part-1-107

 

[Richard.]

David lots of people have said about the codes. They do not last and why spend money on them. If you go for a job and they test you then it might be a 3g or a 6g . Is their anyone on the forum willing to train him .I think @richard does training?? This will be best for your confidence and getting your skills up.

I do half day tuition sessions mainly aimed at people starting out or struggling with certain things. I’m certainly more than happy to have Dave round but I’m not his road to qualifications.

 

[Wonderweaver]

Never heard of adding Nitrogen to shielding gas for Nickel Alloys......you are usually trying to exclude Nitrogen
6% Moly -specshield 2.5%N2 to preserve to chemical resilience.

 

[TechnicAl]

Never heard of adding Nitrogen to shielding gas for Nickel Alloys......you are usually trying to exclude Nitrogen
6% Moly -specshield 2.5%N2 to preserve to chemical resilience.

254SMo?

 

[Wonderweaver]

Yes Trade name AKA 6moly 6mo AS ME ?? ASTM??

 

[TechnicAl]

Thats not a Nickel Alloy so the earlier comments wouldnt apply....its sometimes called super stainless or stable austenitic stainless.....so yes I can see Nirtogen being used in the gas.....maybe only for rooting though....usually to maintain N2 level not increase it.