17
§4.5.4 Electrode selection
The welding current reference for different electrode diameter
Electrode
diameter /mm
1.6
2.0
2.5
3.2
welding current
/A
25
～
40
40
～
60
50
～
80
100
～
130
The relation between the welding current(I)’ factor(K) & electrode diameter(d) (I
＝
K
×
d: Carbon electrode)
Electrode diameter
/mm
1.6
2
～
2.5
3.2
Factor/K
20
～
25
25
～
30
30
～
40
Notice: the above parameters originate from
《
Welding Dictionary
》
P66
～
P67
, Volume 1 of Edition2.
§4.6 Operation Environment
●
Height above sea level is below 1000m.
●
Operation temperature range:-10
0
C
～
+40
0
C.
●
Relative humidity is below 90 % (20
0
C).
●
Preferably site the machine some angles above the floor level, the maximum angle does not
exceed 15
0
.
●
Protect the machine against heavy rain or in hot circumstance against direct sunshine.
●
The content of dust, acid, corrosive gas in the surrounding air or substance can not exceed
normal standard.
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.
