Miller Axcess 675 Manuale d'uso - Pagina 23

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5-2. Welding Circuit

.
Minimizing the welding circuit loop can prevent extreme voltage drops that produce poor welding characteristics.
Standard Welding Circuit
ECL
7
Large Weld Structure
ECL
6
2
7
WL
1
3
2
6
5
Gun
Travel
WL
Current Flow Path
1
3
2
5
Current Flow Path
4
WCL
4
WCL
1
Welding Power Source
2
Electrode Cable
3
Feeder Cable
4
Work Cable
5
Voltage Sensing Lead
6
Wire Feeder
7
Workpiece
In pulse welding applications using
inverter
power
sources,
resistance can result in less than
satisfactory performance. In most
cases, a welding circuit length of 50 ft
(15 m) or less will provide satisfactory
performance with a standard welding
circuit connection.
The length of a welding circuit is
determined as follows:
Welding Circuit = Electrode Cable
Length (ECL) + Work Cable Length
(WCL) + Workpiece Length (WL)
See Section 5-1 for weld cable size.
Variations in welding processes and
welding circuit resistance can affect
apparent voltage at the welding arc.
Voltage sensing can improve welding
performance by providing accurate
feedback to the welding power source.
It is important to connect the voltage
sensing lead as near to the weld as
possible, but not in the return current
path.
Ref. 804 636-A
OM-217 751 Page 19
cable