23
22
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
Welding
current/A
Arc
voltage/V
Argon flow
1
rate/L•min-
Welding
1
rate/cm•min-
38
42
60
76
108
133
159
219
273
325
2.0
2.0
2.0
2.5
2.5
2.5
2.5
2.5
2.5
2.5
8
8
8
8~10
8~10
8~10
8~10
8~10
8~10
8~10
2
2
2
2.5
2.5
2.5
2.5.
2.5
2.5
2.5
75~90
75~95
75~100
80~105
90~110
90~115
95~120
100~ 120
110~ 125
120~ 140
11~13
11~13
11~13
14~16
14~16
14~16
14~16
14~16
14~16
14~16
6~8
6~8
7~9
8~10
9~11
10~12
11~13
12~14
12~14
12~14
4~5
4~5
4~5
4~5
5~6
5~6
5~6
5~6
5~6
5~6
Notice: the above parameters originate from <<Welding Dictionary>> P167,
Volume 1 of Edition 2.
TIG of stainless steel(single run welding)
Workpiece
thickness
/mm
Joint form
tungsten
electrode
diameter
/mm
welding
wire
diameter
/mm
Argon gas
flow rate/
1
L•min-
welding
current
(DCEP)
Welding
speed/
cm•min-1
0.8
1.0
1.5
1.5
2.4
2.4
3.2
3.2
4.8
4.8
6.0
Butt joint
Butt joint
Butt joint
Corner joint
Butt joint
Corner joint
Butt joint
Corner joint
Butt joint
Corner joint
Butt joint
1.0
1.6
1.6
1.6
1.6
1.6
1.6
1.6
2.4
3.2
4.0
1.6
1.6
1.6
1.6
2.4
2.4
2.4
2.4
3.2
3.2
4.0
5
5
7
7
7
7
7
7
8
9
10-12
20~50
50~80
65~105
75~125
85~125
95~135
100~135
115~145
150~225
175~250
220~300
66
56
30
25
30
25
30
25
25
20
25
Notice: the above parameters originate from <<Welding Dictionary>> P150,Volume 1 of Edition 2.
4.4 TIG Parameters Matching
The corresponding relationship between gas nozzle
diameter and electrode diameter
Gas nozzle diameter/mm
6.4
8
9.5
11.1
Electrode diameter/mm
0.5
1.0
1.6 or 2.4
3.2
Notice: the above parameters originate from <<Welding Dictionary>> P142,Volume 1 of Edition 2.
04
Gas nozzle and the shield gas flow rate
Welding
current range/A
DC positive connection
AC
Gas nozzle
diameter/mm
Gas flow
1
rate/L•min-
Gas nozzle
diameter/mm
Gas flow
1
rate/L•min-
10~100
101~150
151~200
201~300
4~9.5
4~9.5
6~13
8~13
4~5
4~7
6~8
8~9
8~9.5
9.5~11
11~13
13~16
6~8
7~10
7~10
8~15
Notice: the above parameters originate from <<Welding Dictionary>> P149,Volume 1 of Edition 2.
Protect effect
best
better
good
bad
worst
Welding area color bright argent orange-yellow blue-purple caesious white powder
of titanium oxid
The relation of welding area color & protect effect of Ti-alloy
Tungsten
Electrode
Diameter/mm
Sharpened of
the Electrode
Diameter/mm
Angle of Cone(º)
Background
Current/a
1.0
1.0
1.6
1.6
2.4
2.4
3.2
4.0
0.125
0.25
0.5
0.8
0.8
1.1
1.1
1.5
12
20
25
30
35
45
60
90
2~15
5~30
8~50
10~70
12~90
15~150
20~200
20~300
Tungsten Electrode
DC PULSE
SERIES
EQUIPMENT
DC PULSE
SERIES
EQUIPMENT
Welding technique
Welding technique