MAINTENANCE AND TROUBLESHOOTING
24
Gas nozzle and the shield gas flow rate
Welding current
range/A
DC positive connection
AC
Gas nozzle
diameter/mm
Gas flow
rate/L
·
min
-1
Gas nozzle
diameter/mm
Gas flow
rate/L
·
min
-1
10
～
100
4
～
9.5
4
～
5
8
～
9.5
6
～
8
101
～
150
4
～
9.5
4
～
7
9.5
～
11
7
～
10
151
～
200
6
～
13
6
～
8
11
～
13
7
～
10
201
～
300
8
～
13
8
～
9
13
～
16
8
～
15
Notice: the above parameters originate from
《
Welding Dictionary
》
P149, Volume 1 of Edition 2.
tungsten electrode
diameter /mm
sharpened of the
electrode diameter/mm
angle of cone
（°）
background current/A
1.0
0.125
12
2
～
15
1.0
0.25
20
5
～
30
1.6
0.5
25
8
～
50
1.6
0.8
30
10
～
70
2.4
0.8
35
12
～
90
2.4
1.1
45
15
～
150
3.2
1.1
60
20
～
200
TIG of stainless steel (single run welding)
Workpiece
thickness
/mm
Joint form
tungsten
electrode
diameter/mm
welding wire
diameter/mm
Argon gas
flow rate/
L
·
min
-1
welding
current
(DCEP)
Welding
speed/
cm
·
min
-1
0.8
Butt joint
1.0
1.6
5
20
～
50
66
1.0
Butt joint
1.6
1.6
5
50
～
80
56
1.5
Butt joint
1.6
1.6
7
65
～
105
30
1.5
Corner
joint
1.6
1.6
7
75
～
125
25
2.4
Butt joint
1.6
2.4
7
85
～
125
30
2.4
Corner
joint
1.6
2.4
7
95
～
135
25
3.2
Butt joint
1.6
2.4
7
100
～
135
30
