ESAB Multimaster 260 Manual De Instrucciones página 12

SECTION 3
NOTE
When using a spool gun option, wire feed
speeds can vary depending on the wire
diameter and alloy being used as well as
the spool braking adjustment being too
high. Only use enough spool braking as
necessary to eliminate spool overrun. DO
NOT OVERTIGHTEN THE SPOOL
BRAKE.
3.3 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.
3.4 Shielding Gases
Table 3-1 lists the types of shielding gas mixtures recommended for the
MultiMaster 260 Pulse. The wire burn-off rate and synergic operation will
vary with changes in shielding gas. The TRIM knob is used to compensate
for small changes in shield gas composition.
3.5 Pulse Parameters
Tables 3-2 through 3-5 list the approximate pulse weld parameters for each
material and diameter available. These are provided for general reference
only. Actual pulse parameters can vary with the equipment set-up, welding
application and shielding gas being used. The wire feed speed ranges
shown in the tables are the same as programmed into the Multimaster 260
Pulse program. Attempting to weld outside of the suggested speed ranges
will result in a "blinking" indicator light on the UltraPulse front panel. A
"steady" light lite on the panel indicates the wire material and diameter
combination selected does not have any pulse data programmed.
12
OPERATION