OPERATION
20
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
Notice: the above parameters originate from
《
Welding Dictionary
》
P150, Volume 1 of Edition 2.
§4.4.4 Electrode selection
The welding current reference for different electrode diameter
Electrode
diameter /mm
1.6
2.0
2.5
3.2
Parameters of piping back sealing welding for mild steel
(
DCEP
)
Piping
diameter
Φ
/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
42
2.0
8
2
75
~
95
11
~
13
6
~
8
4
~
5
60
2.0
8
2
75
~
100
11
~
13
7
~
9
4
~
5
76
2.5
8
~
10
2.5
80
~
105
14
~
16
8
~
10
4
~
5
108
2.5
8
~
10
2.5
90
~
110
14
~
16
9
~
11
5
~
6
133
2.5
8
~
10
2.5
90
~
115
14
~
16
10
~
12
5
~
6
159
2.5
8
~
10
2.5
95
~
120
14
~
16
11
~
13
5
~
6
219
2.5
8
~
10
2.5
100
~
120
14
~
16
12
~
14
5
~
6
273
2.5
8
~
10
2.5
110
~
125
14
~
16
12
~
14
5
~
6
325
2.5
8
~
10
2.5
120
~
140
14
~
16
12
~
14
5
~
6
Notice: the above parameters originate from
《
Welding Dictionary
》
P167, Volume 1 of Edition 2.