Lincoln Electric MAGNUM LA-9 - Manual (Page 9)

CHART 4 — Select tungsten diameter and alumina nozzle based on current and application.
TYPICAL CURRENT RANGES FOR TUNGSTEN ELECTRODES (1)
AC
DCEN (-) DCEP (+)
Balanced Wave Unbalanced Wave
Tungsten Pure and Pure and 1%, 2% 1%, 2%
Electrode 1%, 2% 1%, 2% Thoriated Thoriated Alumina
Diameter Thoriated Thoriated Pure Tungsten Pure Tungsten Nozzle
in. (mm) Tungsten Tungsten Tungsten Zirconiated Tungsten Zirconiated Size
0.020 (0.5) 5- 20 (2) 10- 20 5- 20 5- 15 5- 20 4, 5, 6
0.040 (1.0) 15- 80 (2) 20- 30 20- 60 10- 60 15- 80 4, 5, 6
1/16 (1.6) 70- 150 10-20 30- 80 60- 120 50- 100 70- 150 5, 6
3/32 (2.4) 150- 250 15-30 60- 130 100- 180 100- 160 140- 235 6, 7, 8
1/8 (3.2) 250- 400 25-40 100- 180 160- 250 150- 210 225- 325 6, 7, 8
5/32 (4.0) 400- 500 40-55 160- 240 200- 320 200- 275 300- 400 8, 10
Tungsten Gas Lens
Electrode Collet Collet Body Collet Body
Diameter Part No. Part No. Part No.
in. (mm) (Industry Ref.) (Industry Ref.) (Industry Ref.)
0.020 (0.5) S19498-1 (10N21) S19500-1 (10N29) S19502-1 (45V29)
0.040 (1.0) S19498-2 (10N22) S19500-2 (10N30) S19502-2 (45V24)
1/16 (1.6) S19498-3 (10N23) S19500-3 (10N31) S19502-3 (45V25)
3/32 (2.4) S19498-4 (10N24) S19500-4 (10N32) S19502-4 (45V26)
1/8 (3.2) S19498-5 (10N25) S19500-5 (10N28) S19502-5 (45V27)
5/32 (4.0) S19498-6 (54N20) S19500-6 (406488) S19502-6 (45V28)
Nozzle Orifice Size Standard Nozzle Gas Lens
Diameter (16th of Part No. Part No.
in. (mm) an inch) (Industry Ref.) (Industry Ref.)
1/4 (6) 4 S19367-6 S19369-5
(10N50) (54N18)
5/16 (8) 5 S19367-5 S19369-4
(10N49) (54N17)
3/8 (10) 6 S19367-4 S19369-3
(10N48) (54N16)
7/16 (11) 7 S19367-3 S19369-2
(10N47) (54N15)
1/2 (12.5) 8 S19367-2 S19369-1
(10N46) (54N14)
5/8 (16) 10 S19367-1 —
(10N45)
11/16 (17) Short — S19369-6 (2))
(54N19) (2)
CHART 6 (Alumina Gas Nozzle) — Select alumina gas nozzle orifice size based on application.
Standard gas nozzle, 1-27/32” (46.8mm) long, or gas lens, 1-5/8” (41.2mm) long. (1)
(1) With argon gas.
(2) DCEP (+) is not commonly used in these sizes.
CHART 5 — Select Collet/Collet Body or Gas Lens Collet Body (requires insulator) based on tungsten diameter and
application.
(1) Size “short” is 1-1/8” (28.5mm) long.
(2) Not recommended for use with high frequency current.