| History:
The time of invention of mig welding is not clear, it
is roughly developed after 1920. A patent by Alexander,
filed in December 1924 (USA Patent Number 1,746,207)
appears to present a MIG welding system much as used
today.
DEFINITION: It is an arc welding process where in coalescence
is produced by heating the job with an electric arc
established between a continuously fed metal electrode
and the job. No flux is used but the arc and molten
metal are shielded by an inert gas, which may be argon,
helium, carbon dioxide or a gas mixture.
Principle: In addition to principle of arc welding,
a welding torch guides the bare steel wire, by pressing
trigger on welding gun arc is made between work and
electrode wire a feeder continuously feed steel wire
towards arc to fill the molten wire space, shielding
gas carbon-di-oxide or argon supplied to cover the arc
and molten metal. All the processes Wire feed, shielding
gas and current starts simultaneously. Download
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