[TheForge] Question about MIG welding, spray deposition?

[robert hensarling]

I can't believe the wire speeds you guys use!  58 feet a minute is unreal to 
me.  Of course I just have a $600 MIG from Lowes, so I'm sure I have a basic 
"barely a mig" machine, although it serves me well.   700 IPS is not even 
something I can fathom.
Wow!!

----- Original Message ----- 
From: "Peter Fels & Phoebe Palmer" <artgawk at thegrid.net>
To: "Blacksmithing List Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Tuesday, March 03, 2009 11:54 AM
Subject: Re: [TheForge] Question about MIG welding, spray deposition?


> 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
>>>>>> ______________________________________________________________
>>>>>> TheForge mailing list
>>>>>> Home: http://mailman.qth.net/mailman/listinfo/theforge
>>>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>>>> Post: mailto:TheForge at mailman.qth.net
>>>>>>
>>>>>> This list hosted by: http://www.qsl.net
>>>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>>>>
>>>>>>
>>>>> ______________________________________________________________
>>>>> TheForge mailing list
>>>>> Home: http://mailman.qth.net/mailman/listinfo/theforge
>>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>>> Post: mailto:TheForge at mailman.qth.net
>>>>>
>>>>> This list hosted by: http://www.qsl.net
>>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>>>
>>> ______________________________________________________________
>>> TheForge mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/theforge
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:TheForge at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
>>
> ______________________________________________________________
> TheForge mailing list
> Home: http://mailman.qth.net/mailman/listinfo/theforge
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:TheForge at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>