Würth MM 350 Originalbetriebsanleitung Seite 15

Converting the appliance for alumini-
um wire welding (fig. IV)
1. Replace the wirefeed roll [22] 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 replacement 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 MM350 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]. Select level 1 for a low current welding
range or level 2 for a high current welding
range.
3 The green power supply indicator [36] lights up.
The step switch [41] is used for fine adjustment
of the welding power on the electrode and the
material.
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].
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Operating mode switch
Select the required welding function using the oper-
ating 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
■
time for the light arc.
Overload indicator
If the temperature control indicator [35] lights up on
pressing the welding torch button, this is a signal for
an appliance overload. Allow the appliance to cool
down in no-load mode.
15