The AWS has a publication that may be of interest to you called "The Everyday Pocket Handbook for GMAW and FCAW" for $12.00, or $9.00 for members. This is only one in a series of these "everyday" handbooks. This one has a lot of good information such as shielding gases for spray transfer, globular to spray transition currents, and typical arc voltages. In our shop in the stair/handrail department, we weld carbon steel using .035 wire with 98% Argon, 2% oxygen, @ a minimum of 165 amps. I became aware of these handbooks after an outside inspector was in our shop and used them to check the parameters on my welding procedures for SMAW, GMAW, and FCAW. I don't know what your application is, but if you don't have access to one of these handbooks, I'd be happy to send you the parameters for a particular application. Also, I need to point out that in my last posting, I should have said that a minimum of 80% argon is needed for spray transfer, rather than say 80% is needed.