Table of Contents
Advertisement
B-5
TIG WELDING
The TOUCH START TIG setting of the MODE switch is for
DC TIG (Tungsten Inert Gas) welding. To initiate a weld, the
CONTROL dial is first set to the desired current and the tung-
sten is touched to the work. During the time the tungsten is
touching the work there is very little voltage or current and, in
general, no tungsten contamination. Then, the tungsten is
gently lifted off the work in a rocking motion, which establish-
es the arc.
The ARC CONTROL is not active in the TIG mode. To STOP
a weld, simply pull the TIG torch away from the work. When
the arc voltage reaches approximately 30 Volts the arc will go
out and the machine will reset the current to the Touch Start
level. To reinitiate the arc, retouch the tungsten to the work
and lift. Alternatively, the weld can be stopped by releasing
the Amptrol or arc start switch.
The Ranger® 250 can be used in a wide variety of DC TIG
welding applications. In general the ʻTouch Startʼ feature
allows contamination free starting without the use of a Hi-fre-
quency unit. If desired, the K930-2 TIG Module can be used
with the Ranger® 250. The settings are for reference.
Ranger® 250 settings when using the K930-2 TIG Module
with an Amptrol or Arc Start Switch:
• Set the MODE Switch to the TOUCH START TIG setting.
• Set the "IDLER" Switch to the "AUTO" position.
• Set the "WELDING TERMINALS" switch to the "REMOTE-
LY CONTROLLED" position. This will keep the "Solid
State" contactor open and provide a "cold" electrode until
the Amptrol or Arc Start Switch is pressed.
TYPICAL CURRENT RANGES
Tungsten Electrode
DCEN (-)
Diameter in. (mm)
1%, 2% Thoriated
Tungsten
.010
(.25)
2-15
0.020
(.50)
5-20
0.040
(1.0)
15-80
1/16
(1.6)
70-150
3/32
(2.4)
150-250
1/8
(3.2)
250-400
5/32
(4.0)
400-500
3/16
(4.8)
500-750
1/4
(6.4)
750-1000
(1) When used with argon gas. The current ranges shown must be reduced when using argon/helium or pure helium shielding gases.
(2) Tungsten electrodes are classified as follows by the American Welding Society (AWS):
Pure
1% Thoriated
2% Thoriated
Though not yet recognized by the AWS, Ceriated Tungsten is now widely accepted as a substitute for 2% Thoriated Tungsten in AC and DC applications.
(3) DCEP is not commonly used in these sizes.
(4) TIG torch nozzle "sizes" are in multiples of 1/16ths of an inch:
# 4 = 1/4 in.
(6 mm)
# 5 = 5/16 in.
(8 mm)
# 6 = 3/8 in.
(10 mm)
# 7 = 7/16 in.
(11 mm)
# 8 = _ in.
(12.5 mm)
#10 = 5/8 in.
(16 mm)
(5) TIG torch nozzles are typically made from alumina ceramic. Special applications may require lava nozzles, which are less prone to breakage, but cannot withstand high temperatures
and high duty cycles.
OPERATION
(1)
FOR TUNGSTEN ELECTRODES
DCEP (+)
Approximate Argon Gas Flow
Flow Rate C.F.H. ( l /min.)
1%, 2% Thoriated
Aluminum
Tungsten
(3)
3-8
(2-4)
(3)
5-10
(3-5)
(3)
5-10
(3-5)
10-20
5-10
(3-5)
15-30
13-17
(6-8)
25-40
15-23
(7-11)
40-55
21-25
(10-12)
55-80
23-27
(11-13)
80-125
28-32
(13-15)
EWP
EWTh-1
EWTh-2
RANGER® 250
When using the TIG Module, the OUTPUT control on the
Ranger® 250 is used to set the maximum range of the
CURRENT CONTROL on the TIG Module or an Amptrol if
connected to the TIG Module.
WIRE WELDING-CV
Connect a wire feeder to the Ranger® 250 according to the
instructions in INSTALLATION INSTRUCTIONS Section.
The Ranger® 250 in the CV-WIRE mode, permits it to be
used with a broad range of flux cored wire (Innershield and
Outershield) electrodes and solid wires for MIG welding (gas
metal arc welding). Welding can be finely tuned using the
ARC CONTROL. Turning the ARC CONTROL clockwise
from –10 (soft) to +10 (crisp) changes the arc from soft and
washed-in to crisp and narrow. It acts as an inductance con-
trol. The proper setting depends on the procedure and oper-
ator preference. Start with the dial set at 0.
Listed below are some wires suitable for use on this
machine:
• Innershield - NR-311, NS-3M, NR-207, NR-203 Ni 1%.
• Outershield - 0S-70, 0S-71M.
• Solid wires for MIG welding - .035 (0.9 mm), and .045 (1.1
mm), Super Arc L-50 and L-56, .035 (0.9 mm) and .045
(1.1 mm) Blue Max MIG 308 LS.
Contact your local authorized Lincoln Electric Distributor or
the Lincoln Electric Company for specific wires used on cer-
tain applications with this machine.
Nozzle Size (4), (5)
Stainless Steel
3-8
(2-4)
#4, #5, #6
5-10
(3-5)
5-10
(3-5)
9-13
(4-6)
#5, #6
11-15
(5-7)
#6, #7, #8
11-15
(5-7)
13-17
(6-8)
#8, #10
18-22
(8-10)
23-27
(11-13)
B-5
(2)
TIG TORCH
Advertisement
Table of Contents
