V4.0
200A Multi-Process Welder with LCD Display
8785115
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SHORT-CIRCUIT TRANSFER
Short-circuit transfer is the most common used method to initiate an arc. The
wire electrode is fed continuously down the welding torch until it exits from the
contact tip. The wire touches the workpiece and causes a short-circuit. The wire
heats up and begins to form a molten bead. The bead separates from the end of
the wire and forms a droplet that is transferred into the weld pool. This process
is repeated about 100 times per second, making the arc appear constant to the
human eye.
BASIC MIG WELDING GUIDE
Good weld quality and weld profile depends on the torch angle, direction of
travel, electrode extension (stick out), travel speed, thickness of base metal,
wire feed speed (amperage) and arc voltage. To follow are some basic guides to
assist with your set-up.
TORCH POSITION - TRAVEL DIRECTION, WORK ANGLE
Torch position or technique usually refers to how the wire is directed at the base
metal, the angle and travel direction chosen. Travel speed and work angle will
determine the characteristic of the weld bead profile and degree of weld penetration.
PUSH TECHNIQUE
The wire is located at the leading edge of the weld pool and pushed towards the
un-melted work surface. This technique offers a better view of the weld joint
and direction of the wire into the weld joint. Push technique directs the heat
away from the weld puddle allowing faster travel speeds providing a flatter weld
profile with light penetration - useful for welding thin materials. The welds are
wider and flatter allowing for minimal clean up / grinding time.
PERPENDICULAR TECHNIQUE
The wire is fed directly into the weld, this technique is used primarily for
automated situations or when conditions make it necessary. The weld profile is
generally higher and a deeper penetration is achieved.
DRAG TECHNIQUE
The torch and wire are dragged away from the weld bead. The arc and heat is
concentrated on the weld pool, the base metal receives more heat, deeper melting,
more penetration and the weld profile is higher with more build up.
