AMI M8 Series, Руководство по эксплуатации

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Doc No. 740123 14
MODEL 8 SERIES WELD HEAD
OPERATION MANUAL
8.0 SHIELDING GAS (cont’d.)
8.2 Prepurge time and post purge time are also a factor in minimizing weld
oxidation and electrode life. Refer to chart below for recommended arc
gas flow rates and minimum recommended pre & post purge times.
Note: The chart below (fig. 15) indicates the minimum recommended
purge times.
Using longer purge times will extend the life of the
electrode and produce cleaner welds.
Model
Recommended
Arc Gas
Flow Rate (CFH)
Recommended
Minimum Pre/post
purge time (seconds)
8-2000 15 - 30 (7.0-14.1LPM) 30
8-4000 15 - 30 (7.0-14.1LPM) 30
8-6625 20 - 35 (9.4-16.5 LPM) 30
Fig. 15
Note: If the system is being hooked up for the first time, or if it has been a
number of hours since it was last used, it’s a good idea to initiate the
manual purge button on the power supply to clear the lines of
oxygen for a few minutes before initiating a weld sequence.
9.0 RETURN-TO-HOME (ROTOR) POSITION ADJUSTMENT
The Model 8 series weld heads will return the rotor to the “home” (open)
position at the end of the weld program, after the post purge time has timed-
out. A properly adjusted rotor will stop with both ends of the rotor flush or
slightly recessed in the housing. See fig. 16. A rotor that needs adjustment
will either stop with one side of the rotor protruding out from the housing, or
in a worst case, the rotor does not stop at all after it returns to home, in
which case, the power supply would have to be shut down before
attempting any adjustment.