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2 Preparation for using
2.1 Connection with Power Source
● Connect properly the welding torch according to the operation manual of the power source.
2.2 Selection of Electrode
● The table below shows the general used electrode.
Welding method
D.C. TIG welding
A.C. TIG welding
Ceri-Tun is used popularly, Ceri-Tun is characteristic in good ability of arc starting during lower
welding current and long life, Lan-Tun is characteristic in lower consumption of electrode and long
maintaining of arc stability when D.C. TIG welding. Pure-Tun is used when A.C. TIG welding.
Electrode
2.3 Selection of electrode diameter
Electrode diameter
Φmm
0.5
1.0
1.6
2.4
3.2
4.0
The above table shows the general welding current which correspond to each electrode diameter.
* When A.C. TIG welding, application electrode diameter bring minuteness difference because the
different cleaning action of apply welding machine. When electrode melt fastest, should be choice bigger
diameter electrode.
2.4 Selection of nozzle
● The following table shows recommended nozzle diameter based on the gas shield. Select an
appropriate nozzle, according to this table, taking the workability and shape of work pieces into
consideration.
Argon gas flow（L/min）
Tighten the connection at the joint sections of cables. If the cable are
improperly connected, electricity can generate excessive heat and
can cause a fire.
Material of electrode
Tungsten with 2% Thorium oxide(2% Thori-Tun)
Tungsten with 2% Cerium oxide(2% Ceri-Tun)
Tungsten with 2% Lanthanum oxide(2% Lan-Tun)
Tungsten with 2% Thorium oxide(2% Thori-Tun)
Tungsten with 2% Cerium oxide(2% Ceri-Tun)
Pure tungsten(Pure-Tun)
D.C. TIG welding(EN)
Thori-TunCeri-Tun Lan-Tun Pure-Tun
5~20
15~80
70~150
150~250
150~400
400~500
3~6
4~8
5~10
6~12
Marking color
Welding current(A)
Thori-TunCeri-Tun
Nozzle bore (Nozzle No.)
Φ6.5mm(No.4)
Φ8.0mm(No.5)
Φ9.5mm(No.6)
Φ11.0mm(No.7)
2
Marking color
Red
Gray
Yellow green
Red
Gray
Green
A.C. TIG welding *
Pure-Tun
5~20
5~15
15~80
10~60
70~150
50~100
140~235
100~160
225~325
150~210
300~425
200~275
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