ESAB MultiPower 460 Pulse Bedienerhandbuch PDF herunterladen (Seite 38)

SECTION 4 OPERATION

1. 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 can occur when high resistances in the welding circuit cause changes in

pulse waveform aﬀecting average current levels. The MP-460 TRIM knob and wire feeder speed control knob should be used

to adjust the pulse parameters to accommodate small changes in the welding equipment set-up, base material variations

and maintain a stable pulse welding condition. Mechanical wire feeding inconsistencies will signiﬁcantly aﬀect pulse arc

stability that require correction before ﬁne tuning trim setting .

2. Shielding Gases

Table 4-1 lists the types of shielding gas mixtures that can be used with the MultiPower 460 Pulse. The wire burn-oﬀ rate

and pulse operation can vary with changes in shielding gas. Use the wire feed speed to compensate for small changes in

shield gas composition.

3. Mig Pulsing with Wire Alloys Not Preprogrammed

The MultiPower 460 Pulse permits pulse welding when the Mig wire type or diameter installed on the wire feeder does not

have speciﬁc pulse parameters available through panel selection. By using a combination of wire feed speed and MP-460

Pulse front panel TRIM setting, the pulse Mig welding arc can be ﬁne tuned and stabilized for many diﬀerent wire types and

diameters. The selectable pulse parameters can be any combination of WIRE TYPE or WIRE DIAMETER selected using the

PULSE SELECTION switches. Not all combinations will produce acceptable pulse characteristics but, in many cases, reason-

able pulse arc welding stability can be achieved. This process will take some trial and error but the added ﬂexibility and

expanded pulse range might be beneﬁcial for specialty or rare welding applications.

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ESAB MultiPower 460 Pulse Bedienerhandbuch Seite 38