ESAB MultiPower 460 Pulse Bedienerhandbuch PDF herunterladen (Seite 30)

B. PULSE PROCESS CONTROL

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 work-

piece 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.

C. 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.

D. SHIELDING GASES

Table 4-2 lists the types of shielding gas mixtures that can be used with the

Multipower 460PULSE. 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.

E. NON-SYNERGIC PULSE OPERATION

The Multipower 460PULSE has the unique ability to Pulse MIG weld in the NON-

SYNERGIC mode. Non-synergic operation means the pulse parameters can

be selected by choosing the WIRE TYPE, WIRE DIAMETER, and presetting a

WIRE FEED SPEED on the Multipower 460PULSE panel. The pulse frequency

or arc length (TRIM) is controlled by the TRIM knob. The TRIM knob is

adjustable from the minimum to maximum pulse frequency. By using a

combination of adjusting the wire feed speed on the wire feeder and TRIM setting

on the Multipower 460PULSE, the pulse Mig welding arc can be tuned in and

stabilized.

SECTION 4 OPERATION

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 59 60

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