[TheForge] Question about MIG welding, spray deposition?

[John Allen]

I primarily spray everything since there is very minimal spatter. I
use a 92 argon 8 CO2 mixture. Electrode positive for mig welding and
negative for flux core. 75 25 is ok for spray, its best advantage is
lower spatter in short circuit.



On 3/2/09, Woolley <wjec1 at verizon.net> wrote:
> 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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