Backburn Time; Gas-Shielded Arc Welding; Shutting Down; Maintenance - Metabo MIG MAG 150/20 XT Manual De Uso

ENGLISH
Welding current (voltage)
The welding current (voltage) is set with
the welding step selector switch:
MIG/MAG 150/20 XT
− 6 steps
MIG/MAG 170/30 XTC (Combi)
12 steps
− 6 steps at 230 V
− 6 steps at 400 V
MIG/MAG 200/40 XT, MIG/MAG 250/60
XT, MIG/MAG 300/45 XT
12 steps
− 2 coarse steps
− 6 fine steps
6.3

Backburn Time

When correctly set the backburn time
prevents the electrode wire from sticking
to the weld pool. Setting is adjusted by
the backburn time potentiometer (48).
− Backburn time potentiometer knob
(48) turned fully
left = minimum backburn time.
− Backburn time potentiometer knob
(48) turned fully
right = maximum backburn time.
48
6.4 Gas-shielded Arc Weld-
ing
A
Caution!
Always check before starting work:
− Correct electrode wire installed?
− Correct shielding gas connected?
− Gun correctly equipped (liner,
spiral, tip/shroud
tube)?
1. Attach earth cable at a suitable loca-
tion to the workpiece.
2. Open cylinder valve and set desired
gas flow rate.
Change gas shroud, if necessary.
16
Rule of thumb for calculating the
required amount of shielding gas
Amount of shielding gas [l/min] =
10 x wire diameter [mm]
Example:
Electrode wire diameter 1 mm
required amount of shielding gas 10 l/
min
Diagram for the exact determination
of the shielding gas amount required
Amount of shielding gas in l/min
Gas shroud diameter
in mm
3. Set the welding current (voltage).
to the
A
Caution!
Never actuate the welding current
to the
(voltage) step switch during the run-
ning welding process.
Switching under load causes an over-
load and damages the switches.
4. Select desired operating mode.
5. Set the wire feed speed.
6. Turn machine on at the main switch.
The welding machine is now opera-
tional.
2-step mode (manual welding)
1. Press and hold trigger switch;
the welding process starts.
2. Release trigger switch;
the welding process ends.
4-step mode (continuous welding)
1. Press and release trigger switch;
the welding process starts.
2. Press and release trigger switch
again;
the welding process ends.
Spot weld mode
1. Set the weld time.
2. Press trigger switch;
the spot welding starts.
The welding process ends automati-
cally after the set weld time.
3
Note:
and guide
Releasing
before the set weld time is over also
ends the welding process.
6.5
1.
2.
3.
4.
This welding machine contains no user-
Aluminium Steel
serviceable parts.
Depending on dust build-up it should be
blown out every 4 to 6 months with dry
compressed air.
Periodically check the machine for visi-
ble defects.
Contact a qualified electrician if any of
the cables are damaged.
Current in A
For these MIG/MAG welding machines
we recommend the following accesso-
ries. They have been tested with the
machines and ensure unproblematic
operation.
A
B
C
D
E
F
G
H
I
the trigger switch
J

Shutting Down

Close gas cylinder valve.
Turn machine OFF at the main
switch.
Disconnect earth cable from work-
piece.
Unplug power cable.

7. Maintenance

8. Available Accessories

Welding gun for 150/20 XT,
SB 14 (not detachable)
1) 3 m torch leads
Welding gun for 170/30 XTC,
SB 15 KZ-2
1) 3 m torch leads
2) 4 m torch leads
3) 5 m torch leads
Welding gun for 200/40 XT and
250/60 XT, SB 25 KZ-2
1) 3 m torch leads
2) 4 m torch leads
3) 5 m torch leads
Welding gun for 300/45 XT,
SB 36 KZ-2
1) 3 m torch leads
2) 4 m torch leads
3) 5 m torch leads
Earth cable for 150/20 XT
2
1) 3 m, 16 mm (not detachable)
Earth cable for 170/30 XTC,
200/40 XT and 250/60 XT
2
1) 3 m, 25 mm
Earth cable for 300/45 XT
2
1) 5 m, 35 mm
Dual clock pressure regulator
1) without stop valve
2) with stop valve
Adaptor for electrode wire spools
1) 5 kg spools steel/stainless steel
and 2 kg aluminium spools
2) 15 kg basket coils steel/stain-
less steel and 7 kg aluminium
basket coils
Welding visor
1) Automatic visor,
shade DIN 11