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Heat-to-heat Variation in Inconal 82 Electrode

Heat-to-heat Variation in Inconal 82 Electrode

(OP)
I know these filler metals are doped with arc stabilizers such as Al, but are there other factors that will cause erratic arc in one heat of 82 but not another? Could it be somehow related to the power source?
The process is machine GMAW overlay cladding with approx. 1" oscillation. Spray transfer @ ~300A. Wires are from reputable suppliers (SMC, Sandvik).
The problem is a bit crazy-making!

RE: Heat-to-heat Variation in Inconal 82 Electrode

I would look at how the filler was stored (is it still very clean?), the power source, and gases before I went after chemistry.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: Heat-to-heat Variation in Inconal 82 Electrode

If this is really a heat to heat problem, in other words, you can re-produce arc instability with only this one heat of filler wire and not with other filler wire from different heats, it is a problem with the one heat of filler wire.

RE: Heat-to-heat Variation in Inconal 82 Electrode

(OP)
I am reading an extremely interesting paper by Bill Newell about the influence of high-frequency switching inverter power sources.
Any experiences with arc instability suspected of being linked to these power sources?

RE: Heat-to-heat Variation in Inconal 82 Electrode

ironic metallurgist;
I would send Bill an email for a response. I know Bill personally and he is the type to provide help when asked. If you need his email let me know.

RE: Heat-to-heat Variation in Inconal 82 Electrode

(OP)
metengr,
I met Bill once at a conference a couple years back and my experience has been the same; he is eager to share knowledge. I have his contact info.
The thing about this welding system is that while some aspects are primitive, it uses an inverter power source that I consider totally unnecessary for the task (spray GMAW). My general approach to welding automation is to use the minimum technology for the task and to keep things as simple as possible.
"hi-tech when necessary, but not necessarily hi-tech."

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