Arc Gouging - Lincoln Electric BIG RED 500 Service Manual

BB-6
WELDER OPERATION
DUTY CYCLE
Duty Cycle is the percentage of time the load is
being applied in a 10 minute period. For example a
60% duty cycle, represents 6 minutes of load and 4
minutes of no load in a 10 minute period.
ELECTRODE INFORMATION
The BIG RED ® 600 is designed for horizontal, verti-
cal up, and overhead welding with all types of DC
stick electrodes.
For any electrode the procedures should be kept
within the rating of the machine. For information on
electrodes and their proper application see
(www.lincolnelectric.com) or the appropriate
Lincoln publication.
WELDING MODE
Set the Welding mode switch for the desired
process, either Stick / Gouging or TIG.
CONSTANT CURRENT STICK WELDING
CAUTION
DO NOT TURN THE "OUTPUT RANGE SELECTOR"
WHILE WELDING because the current may arc
between the contacts and damage the switch.
------------------------------------------------------------------------
The "Output Range Selector" provides five overlap-
ping current ranges.
Adjustment" adjusts the current from minimum to
maximum within each range. Open circuit voltage is
also controlled by the "Output Current Adjustment"
permitting control of the arc characteristics.
A high open circuit voltage setting provides the soft
"buttering" arc with best resistance to pop-outs pre-
ferred for most welding. To get this characteristic,
set the "Output Range Selector" to the lowest set-
ting that still provides the current you need and set
the "Output Current Adjustment" near maximum.
For example: to obtain 175 amps and a soft arc, set
the "Output Range Selector" to the 105-220 position
and then adjust the "Output Current Adjustment" to
get 175 amps.
When a forceful "digging" arc is required, usually for
vertical and overhead welding, use a higher "Output
Range Selector" setting and lower open circuit volt-
age.
OPERATION
The "Output Current
BIG RED
For example: to obtain 175 amps and a forceful arc,
set the "Output Range Selector" to the 150-330
position and the "Output Current Adjustment" setting
to get 175 amps.
Some arc instability may be experienced with
EXX10 electrodes when trying to operate with long
arc techniques at settings at the lower end of the
open circuit voltage range.
CAUTION
DO NOT attempt to set the "Current Range
Selector" between the five points designated on
the nameplate.
------------------------------------------------------------------------

ARC GOUGING

Using the "Output Range Selector" and "Output
Control Adjustment" set the output to the desired
level for the gouging electrode being used see table
BB.2.
TABLE BB.2
Carbon Diameter
1/8"(3.2mm)
5/32"(4.0mm)
3/16"9(4.8mm)
1/4"(6.4mm)
5/16"(8.0mm)
3/8"(9.5mm)
® 500/600
BB-6
Current Range (DC, elec-
trode positive)
60-90 Amps
90-150 Amps
200-250 Amps
300-400 Amps
350-450 Amps
450-600 Amps