Metabo Welding Machine MIG/MAG 140 User Manual download pdf (Page 6)

1.4

MIG/MAG 140/160

x When using adjustable pressure reducers set

flow rate according to litre scale in the clock with

the T-screw. Turning the T-screw in increases

the gas flow rate, turning it out reduces the gas

flow rate.

x While setting the gas flow rate, the unit must be

switched on and the torch's trigger switch held

down, so the solenoid gas valve is open. To pre-

vent wasting electrode wire swing the wire feed

unit's leaf spring to the side.

Modifications and repairs to pressure reducers are

strictly prohibited due to the hazards involved. Send

faulty pressure reducers to a service centre.

Earth lead connection

Connect earth clamp of the unit's earth cable as

close as possible to the welding point. Ensure good

metal to metal contact.

Preparation of the welds

The joint section of the workpieces to be welded

must be free of colour, metall covering, dirt, rust,

grease and humidity.

The preparation of the welds is to be done under

observation of all welding techniques regulations.

Hints for Setting and Welding

Techniques

Switching the unit on

The unit is switched on with the combination ON/

OFF – welding step switch. With the switch in the

"0"- position the unit is electrically separated from

the power supply.

The unit is fitted with an embedded temperature

detector, which shuts the unit down in case of an

thermal overload.

The tripping of the thermal overload protector is indi-

cated by the front panel control light. Welding power

source and wire feed are temporarily disabled.

After cooling down the welding power source is

automatically activated again, the control light extin-

guishes.

Setting the welding parameters

After preparation of the welding machine the weld-

ing can begin.

To do so, welding voltage and wire feed have to be

matched to suit the welding task. If the wire feed

speed is increased the welding current increases

accordingly.

For every electrode wire diameter and every weld-

ing task optimal parameters can be found. They are

recognisable at the typical humming sound of the

arc, amongst other.

If there is too much deviation from the optimal

parameters, a satisfactory welding is not possible.

The right joint

The list gives hints for the shaping of the joints.

Form of joint Execution

Platethick-

ness

s (mm)

Gapwidth

b (mm)

I-joint onesided < 1,5

> 1,5

< 2

I-joint on both

sides

2 – 4 < 2

V-joint

3 – 6 < 1

1 2 3 4 5 6 7 8 9 10 11 ... 32 33

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Metabo Welding Machine MIG/MAG 140 User Manual Page 6

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