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20 © Weldclass 2019 | E.&O.E. | Edition 2.2
4.5 Inductance Control
Inductance setting is adjustable on scale of -5 to +5.
This setting changes the MIG waveform to simulate changing the inductance of the welding circuit.
Inductance controls the rate of the current rise and fall as the welding wire contacts the workpiece (known
as a short circuit).
More inductance increases the short circuit time and decreases the short circuit frequency rate. This causes
a wider and more penetrating arc, often with better edge wetting, useful for thicker weld joints.
Less inductance will create a narrow more focused arc. This effect can also be used to fine tune the arc to
produce less spatter. This is often effective on thin materials.
Wire speed, wire size and type, shielding gas will all change the effect that the inductance setting has on
the welding arc. Inductance change will have no practical effect on MIG spray transfer process (as opposed
to short circuit process).
To adjust inductance (only applied in MIG modes):
1. Press ‘Left Selection Knob’ (31) down. Inductance Setting Indicator Light (45) should illuminate.
2. Rotate ‘Left Selection Knob’ (31) to increase or decrease inductance setting. (Normal setting is
‘0’)
Figure 11
4.6 Test Gas
The ‘Test Gas’ button (30) works in both MIG and TIG process modes.
This simply opens gas flow (without feeding wire or giving arc voltage) to allow user to check that there is
sufficient gas flow coming out of the torch nozzle.
Figure 12
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