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Here are a few samples I made in response to your question.
I had been wanting to try different alloys for a while so your question was timely.
Base plate is 1/4" 316 ss.
Carbon steel square tubing is 1" x 1" x 1/8" wall.
3/32" 2% thoriated tungsten - ground for each alloy
90 - 100 amps DC - HF start - no pulsing.
Argon: 15 cu ft/hr flow - .5 sec pre flow - 10 sec post flow.
Wanted to minimize variations for the test but some factors are:
1 - Wire diameter for alloys varied from .035" to 1/16" as this is what I had on hand.
2 - Most troublesome one - the bozo (me) behind the mask.
C22 = hastelloy C22
INC92 = Incoloy 92
RN67 = 30% ni - 70% cu
1 - The RN67 alloy puddle was dirty and sluggish so it may not have been a good choice.
2 - The 308L, 309L and 312 alloys seemed to "wet" the pieces the best compared to the others.
I realize that the alloys I used may not be suitable for this application and, as I have no way to test these samples for strength, please consider this as a simple weld bead appearance test.
Perhaps a more knowledgeable member can shed some light on these results.
Other samples will follow in next post.
too much time on my hands............................................. ......