Miller Auto-Axcess E Digital, Руководство пользователя

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General
OM-257 675 Page 39
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Welding on a single workpiece using multiple welding power sources can cause arc blow and arc impedance to develop or intensify.
250 504-B
1. Welding Power Source
2. Electrode Cable
3. Feeder Cable
4. Work Cable
5. Voltage Sensing Lead
6. Robot
7. Workpiece
Each welding power source should have a
separate work cable connection to the
workpiece. Do not stack or join work
cables together at the workpiece. This is
very important for pulse welding applica-
tions.
It is important to connect the voltage
sensing lead as near to the weld as
possible, but not in the return current path.
Connect voltage sensing lead at the end of
the weld joint.
The direction of the welding path should be
away from the work cable connections.
Connect work clamp at the beginning of the
weld joint.
Each welding gun should have its own
source of shielding gas. Use a separate
shielding gas regulator and shielding gas
connection for each welding gun.
Arc blow is the deflection of a welding arc
from its normal path due to magnetic
forces. It will adversely affect the
appearance of a weld, cause excessive
spatter, and impair the quality of a weld.
Arc blow occurs primarily during the
welding of steel or ferromagnetic metals.
Weld current will take the path of least
resistance, but not always the most direct
path through the workpiece to the work
lead connection. The most intense magnet
force will be around the arc due to a
difference in resistance for the magnetic
path in the base metal. The work clamp
connection is important and should be
placed at the starting point of a weld. It is
recommended to have as short of an arc as
possible so that there is less of an arc for
the magnetic forces to control. Conditions
affecting the magnetic force acting on the
arc vary so widely that the reference here
is only about cabling connections and arc
preferences.
9-7. Using Multiple Welding Power Sources
Gun
Travel
Current Flow Path
1
3
4
6
1
2
2
3
4
5
5
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