[TheForge] Question about MIG welding, spray deposition?

[Woolley]

Peter,

Bare wire Mig is DC reverse polarity (positive electrode), flux core is 
strait polarity. 75/25 mix is ideal, all positions.  Some good info here:

http://www.welding-advisers.com/Mig-welding-tips.html

Good luck






Peter Fels & Phoebe Palmer wrote:
> Been trying to figure out MIG spray deposition now that i have the power 
> to do it.
> Using .035 wire and argon75% CO2 25% mix gas. Electrode negative.
> If i crank it up to about 400 ipm and about 25 volts i get spray 
> deposition as i imagine it to be, but the nozzle and contact tip seem to 
> foul pretty quickly.
> Part of the problem was the awkward position  of the welds and a sore 
> back...which contributed to the fouling i'm sure.
> Looking on the web, they were talking about a different gas mix ( i was 
> using what i have and can easily get) and electrode positive setting.
> Is that right? I keep imagining the wire fusing to the contact tip as 
> soon as the trigger is pulled with electrode pos.
> Can the gas  i have be made to do spray deposition decently?
> Sure appreciate having you folks around to straighten my path every now 
> and then...pete f
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