[lazerbeam]

80% argon is required for spray.
Spray is limited to flat and horizontal fillets.
You can spray with 90/10 and also short circuit with 90/10.
If you need to weld in positions other than flat and horizontal and cannot use short circuit then you need to consider FCAW-gas shielded.
GMAW short circuit for thinner metals- all positions.
FCAW gas shielded for thicker metals- all positions.
One shielding gas 75/25.

[Brennan Clark]

Thanks for all of the replies. The reason I'm wondering, is I'm working on getting my aws level one certification, and I'd like to do some practicing at my house. It's been a while since I've seen the test spec sheets, so I can't comment on whether a specific gas mixture, or wire is mandated, however I do believe there is a 3f vertical fillet weld, but I could be mistaken.

[lazerbeam]

Are you referring to a SENSE Level One certification?

Regardless, spray transfer is limited to flat and horizontal fillets.

[Evanaitor]

Heyyyyyyy, what happens if you use or try using all co2 for spray transfer? And why is it limited to those positions?

[Tommy2069]

iwhen i spray arc i run the amps up to about 24.9 to 26 the wire speed is around 290 to 315 with .045. and thats with 75/25. mix gas. every machine runs a bit hotter or colder but those setting will get you really close to what you going after.