[TheForge] MIG Welding question

Tue Jul 23 04:00:00 2002

on 7/22/02 4:08 PM, John Chobrda at [email protected] wrote:

> I don't know if I can explain it properly but I will give it a try. A MIG
> machine is a
> constant voltage machine (arc voltage does not vary while welding) the
> adjustments on the machine
> are voltage and wire speed. A stick machine (constant current) has amperage
> adjustment (arc
> voltage varies during welding depending on arc gap), more amperage more heat.
> When you strike an
> arc with the mig the voltage across the arc stays constant and the welding
> current automatically
> adjusts itself to maintain the constant physical arc length and arc voltage.
> The faster the wire
> is feed the higher the flow of current to melt the wire, more current more
> heat. If some one can
> explain this better, please help.
> John C.
> 
> [email protected] wrote:
> 
>>> Just a thought, with mig welding heat is a product of wire speed.
>>> John C.
>>> 
>> 
>> john,
>> 
>> how does turning up the wire speed (at the same heat
>> setting/amperage?voltage) raise the heat?
>> 
>> bob schade
>> 
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> 
I have difficulty seeing the arc when I'm mig welding. I can't follow the
arc because the shield always seems to be in the way. Any trick I'm missing?

Anvilsam