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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