OPERATION
Basic MIG Welding
Good weld quality and weld profile depends on gun angle, direction of travel, electrode extension
(stick out), travel speed, thickness of base metal, wire feed speed and arc voltage. To follow are some
basic guides to assist with your setup.
Gun Position - Travel Direction, Work Angle: Gun position or technique usually refers to how the
The wire approaches the
work piece and touches the
work creating a short circuit
between the wire and the
base metal, because there is
no space between the wire
and the base metal there is
no arc and current flows
through the wire.
The wire cannot support
all the current flow,
resistance builds up and
the wire becomes hot and
weak and begins to melt.
The current flow creates
a magnetic field that
begins to pinch the
melting wire forming it
into droplet.
The pinch causes the
forming droplet to separate
and fall towards the now
creating weld pool.
An arc is created at the
separation of the droplet
and the heat and force of
the arc flattens out the
droplet into the weld pool.
The heat of the arc melts
the end of the wire slightly
as it feeds towards the base
metal.
The wire feed speed
overcomes the heat of
the arc and the wire
again approaches the
work to short circuit and
repeat the cycle.
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