Control Panels And Adjustments; Wire Feed Speed Potentiometer (R1); Burn Back Time; Kmw Timer Functions - Kemppi Kempoweld WIRE 400 Operating Manual

6.

COntrOl panels and adJustments

6.1

wire Feed speed pOtentiOmeter (r1)

The wire feed speed is adjusted steplessly with the potentiometer on the front panel, see the
paragraph PANELS. The potentiometer has the memory scale for max. speeds of 18 m/min and
25 m/min.
6.2

Burn BaCK time

Different filler materials and shielding gases behave in different ways in the welding end, so
that you should switch off the welding current with a delay, which is suitable for wire feed
stopping according to the welding case.
If you try to end welding with an unsuitable burn back time, the wire will burn in the contact
tip, there will be too big drop at the wire end, or the wire will stick at the ending point.
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Factors influencing on the delay:
1. Melting of aluminium is much quicker than by the other material, so that the burn back
time is clearly shorter.
2. Steel and especially filler wires require longer time than the stainless materials.
3. Thicker filler wires require longer time. Also by increase of wire feed speed the required
time should be longer. In the instructions label are given points for starting with different
materials. The fine-adjustment should be carried out according to each case in question.
4. Memory scale for potentiometer.
wire inch
5. The wire inch starts the wire feed motor and mechanism, but not the power source.
The filler wire can be driven to the feeder unit, gun and interconnection cable also with
the welding gun´s switch, but then also the power source will get started and the wire
becomes live (gets voltage), and this can cause a danger situation by accidental contact
to dangerous objects!
6.3

Kmw timer FunCtiOns

2 / 4-sequence procedure
the welding with the 2-sequence procedure.
1. Switch pressed: welding starts
2. Switch open: welding stops
the welding with the 4-sequence procedure.
1. Switch pressed: shielding gas is flowing
2. Switch open: welding starts
3. Switch pressed: welding stops
4. Switch open: gas flow stops after the burn back time
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EN
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