ASSEMBL
Y INSTR
UCTIONS
28
MIG 140 INVERTER WELDER 058-9305-6
5. Open the cylinder valve (1) by turning it
counterclockwise until the cylinder
pressure gauge (2) matches the gas
flow gauge (3). Slowly turn the gas
regulator (4) clockwise to increase the
gas flow rate to 20 cubic feet/hour. To
reduce the gas flow, turn the adjustment
knob counterclockwise
(fig T)
.
Note: Gas flow can be heard at the end of the
gun when the trigger is activated.
Note: If there is no gas flow, harsh arc with
excessive spatter will be found and a smooth
weld bead will not be obtained. Avoid
unnecessary gas loss by closing the cylinder
valve when finished welding.
Preparing the work piece
1. Make sure the surface of work piece is
free from dirt, rust, scale, oil or paint.
Or it will create brittle and porous
weld
.
2. Use a metal grinder to bevel the edges
of metal pieces (1) if the metal pieces
to be joined are thick or heavy. The
correct bevel should be around
60 degrees
(fig U)
.
Checking the ground clamp connection
1. Clear any dirt, rust, scale, oil or paint
on the ground clamp
.
2. Make sure the ground connection at
the clamp is proper. A poor connection
at the clamp will reduce welding
power and heat.
3. Make sure the ground clamp touches
the metal.
MC-589305-23
fig T
1
2
3
4
MC-589305-24
fig U
1
