ESAB MultiPower 460 Pulse Betriebsanleitung PDF herunterladen (Seite 17)

SECTION 3 OPERATION

Step 8 Set the voltage knob on the wire feeder to the "5" or center 12 o'clock

position.

Step 9. Connect the work cable to the workpiece and pull the gun trigger to

start welding.

Step 10 The voltage knob on the wire feeder becomes the ARC TRIM and is

used to fine tune the arc length for best arc performance. Turn the

knob clockwise to increase the arc length or counterclockwise to

decrease the arc. Trim the wire speed and volts as needed for the

desired arc characteristics and weld quality.

G. PULSE PROCESS CONTROL and OPERATION

1. Use a tip-to-work distance (TTW) of 3/8" to 5/8". This refers to the distance

between the end of the Mig gun contact tip and the workpiece or weld

puddle. The tip-to-work distance can also be used to adjust the stability

of the arc. Changes in distance will cause the arc to shorten or lengthen

as desired for best results. Excessive tip to work movement can cause arc

instability. Maintaining a constant TTW will insure the best arc stability and

consistency.

2. For the best arc stability, keep the arc on the front edge of the molten

puddle and use a 5 to 10 degree gun angle from the vertical.

3. If the arc is "crackling" or if spatter is excessive lengthen the arc. If the arc

is "fluttering" or difficult to control then shorten the arc length.

H. PULSE MIG ARC STABILITY

Many variables can affect the arc stability of pulse MIG

welding. Some examples are:

Differences in shielding gas compositions

Differences in weld wire chemistry

Water vs. air cooled guns

Base metal surface condition

Tip-to work distance

Variations on wire feed speed

Wire feedability

Long welding cables

High resistance cables and connections

When adverse conditions are present, the pulse arc stability is sometimes less

than desirable. The arc will "crackle" and produce higher than normal spatter

levels. This occurs when high resistances in the welding circuit cause changes

pulse waveform and average current levels or the wire feed rate is varying

excessively. The TRIM knob adjusts the pulse frequency to accommodate

small changes in the welding equipment set-up and base material variations

to achieve a stable pulse welding condition.

I. SHIELDING GASES

Table 4-3 lists the types of shielding gas mixtures that can be used with the

MultiPower 460 Pulse. The wire burn-off rate and synergic operation can vary

with changes in shielding gas. The TRIM knob is used to compensate for small

changes in shield gas composition.

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