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Marcos
Top macro is ER70S-6
No inclusions, or faults visible. Good fusion. A little reinforcement at the root. The weld pool was more fluid which can be seen as slight sag on the bottom of the cap which could be seen as a stress concentrator by a picky inspector. I liked the way the it was more fluid and was very nice and easy to use for the first time.
Middle macro is ER70S-4
No inclusions or faults visible. Good fusion. Plenty of reinforcement at the root. No sharp corners on the cap to pipe fusion. Also very nice to use but not quite as fluid as the -6 wire.
Bottom macro is ER70S-2
No inclusions or faults visible. Good fusion. Root is flat but still passing, no suck back. Most even cap. Using this wire for the first time in quite a while I found it cumbersome due to the more "viscose" weld pool which did not flow as easily as the other wires. Technique I suppose would improve root reinforcement.
My conclusion is that all three wires are usable and have their places. I found the ER70S-2 the most difficult to use and would prefer not to use it. I would most prefer to use the ER70S-4 because I know that I will get good root reinforcement with my preferred method. I would also be pleased to use ER70S-6 wire because it is easy to use and I would be confident that there would be no suck back.
I think all three of the above welds would pass DT and NDT.
Final comment: I spoke with a large filler manufacturer's tech support. They stated that I should not be able to tell the difference between the three fillers. Clearly this guy is not a qualified tig welder himself because I could tell all three were distinctly different.
