[TheForge] Question about MIG welding, spray deposition?

[Andy Gladish]

So could someone sum up please?
I've been trying to get my brain around this spray thing for a long time...
is it just a matter of turning up the volts and reversing polarity for any  
given weld, to go from frying bacon to hissing spray?

On Tue, 03 Mar 2009 00:05:31 -0800, Peter Fels & Phoebe Palmer  
<artgawk at thegrid.net> wrote:

> 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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-- 
Andy Gladish, Metal Work
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