Welding Process; Stick (Constant Current) Welding; Tig (Constant Current) Welding; Wire Feed Welding Processes (Constant Voltage - Lincoln Electric RANGER 250 GXT (AU) Operator's Manual

B-4

WELDING PROCESS

For any electrodes the procedures should be kept within
the rating of the machine. For electrode information see
the appropriate Lincoln publication.

STICK (CONSTANT CURRENT) WELDING

Connect welding cables to the "TO WORK" and "ELEC-
TRODE" studs. Start the engine. Set the "Polarity" switch
to the desired polarity. The "RANGE" switch markings
indicate the maximum current for that range as well as
the typical electrode size for that range. The "OUTPUT"
Control provides fine adjustment of the welding current
within the select range. For maximum output within a
selected range set the "OUTPUT" Control at 10. For min-
imum output within a selected range set the "OUTPUT"
Control at 5. ("OUTPUT" Control settings below 5 may
reduce arc stability) For best overall welding perfor-
mance set the "RANGE" Switch to the lowest setting and
the OUTPUT" Control near the maximum to achieve the
desired welding current.
RANGE SETTING TYPICAL
ELECTRODE SIZE
80 MAX. 3/32
130 MAX. 1/8
180 MAX. 5/32
250 MAX. 3/16
The Ranger® 250 GXT (AU) can be used with a broad
range of AC and DC stick electrodes. See "Welding Tips
1" included with the Ranger® 250 GXT (AU) for elec-
trodes within the rating of this unit and recommended
welding currents of each.

TIG (CONSTANT CURRENT) WELDING

The Ranger® 250 GXT (AU) can be used in a wide variety of
AC and DC Tungsten Inert Gas (TIG) welding applications for
AC TIG Welding up to 200 amps and DC TIG welding up to 250
amps.
The K930 [ ] TIG Module installed on a Ranger® 250 GXT
(AU) provides high frequency and shielding gas control for AC
and DC GTAW (TIG) welding processes. The TIG Module
allows full range output control.
When using the Ranger® 250 GXT (AU) for AC TIG welding of
aluminum the following settings and electrodes are recommend-
ed:
SETTINGS FOR PURE TUNGSTEN
TUNGSTEN RANGE SWITCH
DIAMETER (in.) SETTINGS
1/8 80 or 130
3/32 80
1/16 80
OPERATION
For AC TIG Welding, the maximum TIG Welding out-
put currents on each range setting will be approxi-
mately 50% higher than those marked on the name-
plate. This is due to the special nature of the AC TIG
welding arc. Do not AC TIG weld on the 250 Amp set-
ting. The output may exceed the rating of the
Ranger® 250 GXT (AU).
WIRE FEED WELDING PROCESSES
(CONSTANT VOLTAGE)
The Innershield
the Ranger® 250 GXT (AU) is NR
trode sizes and welding ranges that can be used with
the Ranger® 250 GXT (AU) are shown in the following
table:
CURRENT RANGE
50 TO 80 AMPS
70 TO 130 AMPS
110 TO 180 AMPS
The Ranger® 250 GXT (AU) is recommended for lim-
160 TO 250 AMPS
ited "MIG" welding (GMAW - gas metal arc welding).
The recommended electrodes are .030" and .035" L-
50 and L-56. They must be used with a blended
shielding gas such as C25 (75% Argon - 25% CO
The welding ranges that can be used with the
Ranger® 250 GXT (AU) are shown in the following
table:

ARC GOUGING

The Ranger® 250 GXT (AU) can be used for limited
arc gouging.
Set the Range switch to adjust output current to the
desired level for the gouging electrode being used
according to the ratings in the following table:
APPROXIMATE
CURRENT RANGE
100 - 300 Amps
45 - 140 Amps
45 - 100 Amps
RANGER® 250 GXT (AU)
SETTINGS FOR 1% THORIATED TUNGSTEN
TUNGSTEN RANGE SWITCH
DIAMETER (in.) SETTINGS
1/8 80, 130, or 180
3/32 80 or 130
1/16 80
®
electrode recommended for use with
Diameter Wire Speed
(in.) Range In./Min.
.035 80 - 110
.045 70 - 130
.068 40 - 90
5/64 50 - 75
Diameter Wire Speed
(in.) Range In./Min.
.030 75 - 300
.035 100 - 250
.045 125 - 200
ELECTRODE SETTING CURRENT RANGE (DC, electrode positive)
1/8
5/32
3/16
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APPROXIMATE
CURRENT RANGE
80 - 225 Amps
50 - 180 Amps
45 - 120 Amps
®
-211-MP. The elec-
Approximate
Current Range
75A to 120A
120A to 170A
125A to 210A
180A to 235A
).
2
Approximate
Current Range
50A to 130A
80A to 175A
145A to 200A
30 - 60 Amps
90 - 150 Amps
150 - 250 Amps