AMI M8 Series, Руководство по эксплуатации

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Doc No. 740123 13
MODEL 8 SERIES WELD HEAD
OPERATION MANUAL
7.0 ELECTRODE GEOMETRY & INSTALLATION (cont’d.)
7.4 Spare electrode set screws are located in the weld head housing near
the cable attachment. See fig. 14.
Fig. 14
Spare electrode set screws.
8.0 SHIELDING GAS
The type of shielding gas used has a profound effect on the character of the arc
and the depth of weld penetration. The most commonly used shielding gas and
backup (I.D. purge) gas used is Argon. Gas mixtures of 95% Argon/5% Hydrogen
or 75% Helium/25% Argon are sometimes used to achieve deeper penetration.
Consult the factory for recommendations.
8.1 The Model 8 series weld heads work best when the arc gas is
set to the proper flow rate. Excessive flow rates can blow the arc, and
flow rates set too low can cause excessive weld oxidation
(discoloration) and electrode contamination. Use the manual purge
button on the power supply to open the arc gas solenoid, and set the
flow rate on your flow meter at your gas source.