[TheForge] Question about MIG welding, spray deposition?

[Peter Fels & Phoebe Palmer]

John & Woolley:
Thank you both. Tried reverse polarity today and was surprised at the 
good results. Might not have been the first time i was wrong~
Glad the 25/75 is OK cause that's all i can easily get, and i have to 
drive 35 miles to Morro Bay to get that, if they have it.
Will check out http://www.welding-advisers.com/Mig-welding-tips.html

Much better...thanks!

John Allen wrote:
> 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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>