[TheForge] Question about MIG welding, spray deposition?

[Peter Fels & Phoebe Palmer]

Andy and James:
I'm the wrong person to answer but that's never stopped me before.
So far as i can see at this point, the main advantages to spray 
deposition are that it's faster, low spatter and better  penetration..it 
also seems to be less sensitive to the odd bit of rust and crud.
The web site was talking .035 wire, 420 to 700 IPM wire feed speed, 180 
to 350 amps, and 25 to 34 volts..electrode positive.
They suggest getting spray with the volts a bit low and upping the 
voltage till the noisy crackling sound quiets some and the bead flattens 
some..too high and it gets quiet and the puddle gets runny.pf

Andy Gladish wrote:
> 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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