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B-6
The Ranger® 305D (AU) can be used with a broad range
of DC stick electrodes. The MODE switch provides two
stick welding settings as follows:
Constant Current (CC-STICK) Welding
The CC-STICK position of the MODE switch is designed
for horizontal and vertical-up welding with all types of
electrodes, especially low hydrogen. The output CON-
TROL dial adjusts the full output range for stick welding.
The ARC CONTROL dial sets the short circuit current
(arc-force) during stick welding to adjust for a soft or
crisp arc. Increasing the number from -10(soft) to
+10(crisp) increases the short circuit current and pre-
vents sticking of the electrode to the plate while welding.
This can also increase spatter. It is recommended that
the ARC CONTROL be set to the minimum number with-
out electrode sticking. Start with the dial set at 0.
DOWNHILL PIPE Welding
This slope controlled setting is intended for "out-of-posi-
tion" and "down hill" pipe welding where the operator
would like to control the current level by changing the arc
length. The output CONTROL dial adjusts the full output
range for pipe welding. The ARC CONTROL dial sets the
short circuit current (arc-force) during stick welding to
adjust for a soft or more forceful digging arc (crisp).
Increasing the number from -10(soft) to +10(crisp)
increases the short circuit current which results in a more
forceful digging arc.Typically a forceful digging arc is pre-
ferred for root and hot passes. A softer arc is preferred
for fill and cap passes where weld puddle control and
deposition ("stacking" of iron) are key to fast travel
speeds. This can also increase spatter.
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
TABLE B.2
FOR TUNGSTEN ELECTRODES
(1)
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
It is recommended that the ARC CONTROL be set to the
minimum number without electrode sticking. Start with
the dial set at 0.
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 tungsten is touched to the work. During the time
the tungsten is touching the work there is very little volt-
age or current and, in general, no tungsten contamina-
tion. Then, the tungsten is gently lifted off the work in a
rocking motion, which establishes the arc.
When in the TOUCH START TIG mode and when a
Amptrol is connected to the 6-Pin connector the OUT-
PUT dial is used to set the maximum current range of the
current control of the Amptrol.
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® 305D (AU) can be used in a wide variety of
DC TIG welding applications. In general the 'Touch Start'
feature allows contamination free starting without the use
of a Hi-frequency unit. If desired, the K930-2 TIG Module
can be used with the Ranger® 305D (AU). The settings
are for reference.
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-6
(2)
TIG TORCH
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