Shindaiwa DGW500DM, Owner'S And Operator'S Manual

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Proper Cable Cross-Sectional Area (Unit: mm
2
)
Return Length
Weld Current
20m 30m 40m 60m 80m 100m
500A 38 60 80 125 200 200
450A 38 60 80 100 150 200
400A 38 50 60 100 125 200
350A 30 50 60 80 125 150
300A 30 38 50 80 100 125
250A 22 30 38 60 80 100
200A 22 30 30 50 60 80
150A 22 22 22 38 50 60
100A 22 22 22 30 30 38
8-2. Welding Polarity
There are "+" (positive) and "
-
" (negative) weld output terminals.
Refer to the table below to select a polarity corresponding to the work you are
performing.
<Note>
•
Use the polarity indicated for the welding rods being used if so indicated.
•
When welding with 2 persons using different polarities for the same base material,
a single worker must not hold 2 holders because the voltage between the 2
holders could become high and there may be a danger.
(1) Shielded Metal Arc Welding, Gouging, Scratch Start TIG
(2) Semi-automatic Arc Welding (MIG, MAG, Self-shielded)
Polarity
Rod
Indication
Applications Connecting Method
Straight
Polarity
DC-
Shielded metal arc welding of
structures and similar items
Scratch Start TIG Welding
+ (positive) terminal
: Earth (Base material)
- (negative) terminal
: Holder (welding rod)
Reverse
Polarity
DC+
Shielded metal arc welding of
laminates, weld overlays, stainless
steel and similar materials
Gouging
+ (positive) terminal
: Holder (welding rod)
- (negative) terminal
: Earth (Base material)
Polarity
Wire
Indication
Applications Connecting Method
Straight
Polarity
DC- Self-shielded Arc Welding
+ (positive) terminal
: Earth (Base material)
- (negative) terminal
: Torch (wire)
Reverse
Polarity
DC+
MIG Welding
，
MAG Welding
Self-shielded Arc Welding
+ (positive) terminal
: Torch (wire)
- (negative) terminal
: Earth (Base material)