17

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speed and back off slightly to avoid the possibility of the wire welding

itself to the tip. This is the reason position 6 is recommended for start

up.

NOTE: The Wire Feed control is for fine tuning the wire speed. The speed of

wire delivery will increase automatically as the current is increased.

Therefore, once the ideal speed is achieved by fine tuning, it should not

be necessary to adjust this control when the welding current changes.

NOTE: Listen to the sound made. An irregular crackling sound denotes too

high a wire speed. Decrease the speed until a regular, strong buzzing

sound is heard.

THERMAL OVERLOAD

The ‘Thermal Overload’ shuts off the

welder when it becomes too hot, due to

the duty cycle being exceeded. This is to

prevent any damage to the welder.

When this occurs, the warning lamp

shown will light up. Allow the welder to

cool until the amber light extinguishes

before resuming work.

DUTY CYCLE

The duty cycle determines the machine ‘down time’. i.e 10% means 1 minutes

operation followed by 9 minutes of rest. The duty cycle must be adhered to

prevent the thermal cutout protection from activating.

Do not exceed the stated duty cycle for this machine. Failure to heed this

warning may invalidate your warranty.

These welders are covered by regulations EN 60974-1 and EN 50199, where the duty

cycle is expressed as a percentage of time the machine may be used in a given period

for a specified welding current.

Using the example shown, which is an illustration of the data plate;-

e.g. when welding at 40 amps the machine may be used for 6 minutes (60%) in any

10 minute period.

IMIG100NG

Duty Cycle (%)

20

60

100

Rated Welding Current (A)

100

68

52

Conventional Load Voltage (V)

19

17.4

16.6