26
101
～
150
4
～
9.5
4
～
7
151
～
200
6
～
13
6
～
8
201
～
300
8
～
13
8
～
9
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
3.2
Corner joint
1.6
2.4
7
115
～
145
25
4.8
Butt joint
2.4
3.2
8
150
～
225
25
4.8
Corner joint
3.2
3.2
9
175
～
250
20
Notice: the above parameters originate from
《
Welding Dictionary
》
P150, Volume 1 of Edition 2.
Parameters of piping back sealing welding for mild steel
（
DCEP
）
Piping
diameterΦ/mm
Tungsten
electrode
diameter/mm
Gas nozzle
diameter/mm
Welding wire
diameter/mm
Welding
current/A
Arc
voltage/V
Argon
flow
rate
/
L·min
-1
Welding
rate
/
cm·min
-1
38
2.0
8
2
75
～
90
11
～
13
6
～
8
4
～
5
