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8. Welding Operation
8-1 Selection – Welding Cable
Select the cable with proper gauge, based on the allowable amperage and the
length, per the table shown below.
The welding capacity is to reduce if the small gauge cable is used.
<Caution>
z Welding cables should be used unstrained. When the welding cables are used
in swirl, the welding capacity is to reduce.
Size of Cable (Unit: mm
2
)
Return Length
Welding Current
20m 30m 40m 60m 80m 100m
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 Polarity
There are two welding output terminals, + and - .
Select the polarity according to the operation, referring to the table below.
<Caution>
z Follow the instruction of the welding rods, the polarity of which is specified.
Application Connection
Normal Polarity
Generals Welding, such
as construction
Plus to the Earth (Material)
Minus to holder (Rod)
Reverse Polarity
Thin Plate, Build-Up
Welding, Stainless Steel
Plus to holder (Rod)
Minus to the Earth (Material)
8-3 Connection – Welding Cable
Danger : Electric Shock
z Before connecting or disconnecting a welding cable from welding output
terminals, stop the engine, and remove the engine key. A person performing
should always keep the key.
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