Würth MM 230 Originalbetriebsanleitung Seite 18

10. Press the wirefeed button [21] until the wire pro-
trudes 20 mm out of the torch neck.
11. Screw the power nozzle suitable for the wire thick-
ness into the torch [1] and cut off the protruding
piece of wire.
Connecting the shielding gas cylinder
1. Place the shielding gas cylinder [3] on the stand
and secure it using the safety chain [2].
2. Open the valve of the gas cylinder [4] several times
in rapid succession so that dirt particles, if any, are
blown out.
3. Connect the pressure reducer [7] to the shielding
gas cylinder [3].
4. Connect the shielding gas hose [8] to the pressure
reducer [7] using the screw connection.
5. Open the valve of the gas cylinder [4].
3 Set the gas flow while pressing the welding torch
button at the setting screw [9] of the pressure
reducer [7]. The amount of gas is indicated at the
flow meter [6].
Amount of gas = Wire diameter x 10 l/min.
3 The amount of gas left in the cylinder is indicated
at the pressure gauge [5].
Converting the appliance for aluminium
wire welding (fig. IV)
1. Replace the wirefeed roll [24] by a suitable alu-
minium wirefeed roll.
2. Replace the steel torch by an aluminium torch and
replace the steel feeding core by a plastic feeding
core [33].
3. Remove the supporting pipe [34] in the central
socket [13].
4. Cut off the protruding plastic feeding core [33]
just in front of the wirefeed roll; then push the brass
tubing (after cutting it to the correct size) over the
protruding plastic feeding core [33] in order to
stabilise it.
5. Tighten the welding torch and thread the wire
electrode into it. The order numbers for replace-
ment parts depend on the type of the torch used
and the diameter of the wire; they can be found in
the spare parts list for the welding torches.
Taking into service (fig. VI / VII)
Operating the MM230 is very easy:
The wirefeed is determined by the set welding level and
is adjusted automatically.
The wire feed speed can be corrected manually.
Switch on the appliance with the main switch [40].
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3 The green power supply indicator [36] lights up.
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The step switch [41] is used for fine adjustment of the
welding power on the electrode and the material.
Never change the setting while welding!
If undercuts are visible, reduce the welding
voltage using the step switch [41]. If the welding seam
is too thick, increase the welding voltage using the step
switch [41].
Operating mode switch
Select the required welding function using the operat-
ing mode switch [39]:
2-cycle welding
1. Keep the welding torch button pressed.
3 The gas valve is opened. The wirefeed speed is
controlled automatically, the light arc is ignited.
2. Release the welding torch button.
3 The wirefeed is stopped, the automatically
controlled back burn time starts to elapse. The
wire burns back so that it does not adhere to the
workpiece. The light arc goes out.
4-cycle welding
1. Press the welding torch button briefly.
3 The gas valve is opened. The wirefeed speed is
controlled automatically, the light arc is ignited.
2. Press the welding torch button briefly once again.
3 The wirefeed is stopped, the automatically
controlled back burn time starts to elapse. The
wire burns back so that it does not adhere to the
workpiece. The light arc goes out.
Spot welding
1. Press the welding torch button.
3 The light arc is ignited; it goes out again after the
set spot welding time has elapsed.
2. Release the welding torch button after the light arc
has gone out.
Rotary controller for wirefeed
The rotary controller [38] is used for the fine adjust-
ment of the wirefeed. The wirefeed is determined by the
set welding level and is adjusted automatically.
1. To ensure a sufficient wirefeed, set the rotary con-
troller [38] to central position when working with
the welding levels 1-5.
2. Reduce the wirefeed if the wire is supplied with too
much pressure.
3. Increase the wirefeed if the light arc is too hot.
Rotary controller for spot welding time
Use the rotary controller [37] to set the burning
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time for the light arc.