Parweld XTM303C, Руководство оператора

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5.9 Sheilding gas connection
1. Using the gas hose supplied connect the hose to the gas inlet
connection on the rear of the machine and tighten it with a
spanner.
2. Connect the opposite end of the gas hose to the output
connection of a gas regulator capable of supplying the correct
gas flow for the welding operation.
note if the gas cylinder is to be stored on the back of the
machine ensure it is secured using the retention chain provided
6.0 Operation
1. Switch on the machine using the switch no the front panel, this
lights the Green LED on the front panel.
2. Turn the “VOLTAGE SELECTOR” switches Set voltage midway
between high/low voltages.
NOTE: Check that drive rolls, and torch parts are correct
for the wire size and type being used.
3. The optimum idle roll pressure varies with type of wire, wire
diameter, surface conditions, lubrication, and hardness. As a
general rule, hard wires may require greater pressure, and soft,
or aluminium wire, may require less pressure than the factory
setting. The optimum idle roll setting can be determined as
follows:
4. Press end of gun against a solid object that is electrically
isolated from the welder output and press the gun trigger for
several seconds.
5. If the wire “bird nests”, jams or breaks at the drive roll, the idle
roll pressure is too great. Back the adjustment knob out 1/2
turn, run new wire. If the only result was drive roll slippage,
loosen the Hand nut on the central connector and pull the gun
forward about 6” (15cm) away from the power source. There
should be a slight waviness in the exposed wire. If there is no
waviness, the pressure is too low. Tighten the adjustment knob
1/4 turn, reinstall the gun cable and repeat the above steps.
6.1 Feeding wire electrode
Note when triggering, the electrode and drive mechanism are
electrically “lIVe” relative to work and ground and remain
“lIVe” several seconds after the gun trigger is released.
WarnInG
When using an open arc process, it is necessary to use correct
eye, head, and body protection.
1. Position wire over joint. The end of the wire may be lightly
touching the work.
2. Lower welding helmet, operate gun trigger, and begin welding.
Hold the gun so the contact tip to work distance is about 3/8”
(10 mm).
3. To stop welding, release the gun trigger and then pull the gun
away from the work after the arc goes out.
4. When no more welding is to be done, close valve on gas
cylinder (if used), momentarily operate gun trigger to release
gas pressure and turn off the machine.
6.2 Optimising weld parameters
nOte these settings are guidelines only. Material and wire
type, joint design, fit up, position, shielding gas, etc. affect
settings. produce test welds to be sure they comply to
specifications.
Material thickness determines weld parameters.
1. Convert Material Thickness to Amperage (A) (0.25mm= 1 Amp)
3.2mm = 125 A
2. Select Wire Size
Amperage Range Wire Size
40 - 145 A
0.8 mm
50 - 180 A 1.0 mm
75 - 250 A 1.2 mm
3. Select Wire Speed (Amperage)
Wire Size
Feed speed
0.8 mm 0.05m/min per Amp
1.0 mm 0.04m/min per Amp
1.2 mm 0.025m/min per Amp
So based on 3.2 mm material thickness amperage should be 125A if
using 1.0mm wire then the wire feed speed should be
0.04 X 125= 5m/min
Wire speed (amperage) controls weld penetration
4. Select Voltage. Voltage controls height and width of weld
bead.
low Voltage: wire stubs into work
High Voltage: arc is unstable (spatter)
Set voltage midway between high/low voltages.
And then fine tune accordingly
nOte these settings are guidelines only. Material and wire
type, joint design, fit up, position, shielding gas, etc. affect
settings. produce test welds to be sure they comply to
specifications.
Material thickness determines weld parameters.
6.3 Additional welding controls
Burn back adjustment. when welding at high amperages the wire
can often burn back onto or close to the contact tip to prevent this
happening you can increase the burn back control (18) located
inside the wire spool cover.
Soft Start. The soft start control slows the acceleration of the wire
feed motor as the act starts and so reduces wire snubing and spatter
at the weld start. This control should be adjusted to give a smoother
start to the weld. (17).
7.0 Fault Finding