AMI M8 Series, Руководство по эксплуатации

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Doc No. 740123 9
MODEL 8 SERIES WELD HEAD
OPERATION MANUAL
7.0 ELECTRODE GEOMETRY & INSTALLATION
CAUTION
To prevent the possibility of electrical shock, the power supply must be in the
“TEST” mode before proceeding with electrode installation or removal. Take
extreme care that fingers or foreign objects are clear of the rotor when jogging.
The recommended electrode type is 2% Ceriated. (AWS Spec. A5.12/A5.12M,
Orange tip). This type of electrode provides superior arc starting and longer life
than 2% Thoriated electrodes. Other types can also be used. Consult factory for
recommendations.
The Model 8 series heads accommodate both 1/16” (1.6mm) or 3/32” (2.3mm)
diameter electrodes. The mounting holes in the rotor are approximately 180
degrees apart.
CAUTION
Do not install a 1/16” electrode into the 3/32” electrode mounting hole, and never
install more than one electrode
.
7.1 The ceramic heat shield installed in the rotor is to be used in either the
1/16” or 3/32” electrode position. If it is mounted in the wrong location,
remove the two button head screws that hold the heat shield strap
and reattach it at the other electrode location. Be careful not to drop
the screws into the weld head.
7.2 The electrode length ultimately determines the arc gap, and the arc
gap determines the arc voltage which affects the heat input into the
weld. Thus a consistent arc gap from weld to weld is essential for weld
repeatability. In order to determine the electrode diameter, length and
tip diameter for a specific application, see figures 7 – 11.