Appendix
OMCTT5621E18
55
14.2 Tungsten welding rod
1) The following table shows tungsten electrode types commonly used for TIG welding.
2) Refer to the following table for the selection of tungsten electrode diameters.
14.3 TIG welding shield gas
As for the TIG welding shield gas, use the welding
argon gas.
The incorporation of impurities, such as oxygen, mois
-
ture, nitrogen, etc. into the argon gas, can be a cause to
blowholes, and reduces the quality of welding. (In AC
TIG and MIX TIG, the cleaning activities also become
less efficient, and the welding quality in bead appear
-
ance, penetration, etc. is considerably affected.)
14.4 Filler wire
For the filler wire, material, which is same as base mate
-
rial, is used in general. In special cases including the
welding of different metal, etc., select material depend
-
ing on your purposes.
As for the diameter of filler wire, an appropriate thick
-
ness is decided depending on the welding current in
general.
Guideline for selecting filler wire diameter
Tungsten electrode type
Symbol
Applicable TIG welding method
Pure tungsten
YWP
AC TIG
Tungsten with 2 % Cerium trioxide
YWCe-2
DC TIG, AC TIG
Tungsten with 2 % Lanthanum trioxide
YWLa-2
DC TIG
<About “Symbol”>
• YWP: Pure tungsten.
• YWCe-2: Tungsten with 2%Cerium trioxide
• YWLa-2: Tungsten with 2% Lanthanum trioxide
Electrode size (Dia.)
(mm
)
Welding current (A)
Electrode minus (-)
(DCEN)
Electrode plus
(+)
(DCEP)
0.5
5 - 20
1.0
15 - 80
1.6
70 - 150
10 - 20
2.4
150 - 250
15 - 30
3.2
250 - 400
25 - 40
4.0
400 - 500
40 - 55
4.8
500 - 800
55 - 80
Welding current (A)
Filler wire size (Dia.) (mm
)
10 - 20
Up to 1.0
20 - 50
Up to 1.6
50 - 100
1.0 - 2.4
100 - 200
1.6 - 3.0
200 - 300
2.4 - 4.5
