20
7.Range of welding current and voltage in CO
2
welding
‐
The option of the welding speed
The welding quality and productivity should be taken into consideration for the option of welding speed. In case that the
welding speed increases, it weakens the protection efficiency and speeds up the cooling process. As a consequence, it is
not optimal for the seaming. In the event that the speed is too slow, the work piece will be easily damaged, and the
seaming is not ideal. In practical operation, the welding speed should not exceed 1m/min.
‐
The length of wire stretching out
The length of wire stretching out the nozzle should be appropriate. The increase of the length of wire stretching out of the
nozzle can improve the productivity, but if it is too long, excessive spatter will occur in the welding process. Generally, the
length of wire stretching out the nozzle should be 10 times as the welding wire diameter.
‐
The setting of the C0
2
flow volume
The protection efficiency is the primary consideration. Besides, inner
‐
angle welding has better protection efficiency than
external
‐
angel welding. For the main parameter, refer to the following figure.
Option of C0
2
flow volume
Welding mode
Thin wire C0
2
welding
Thick wire C0
2
welding
Thick wire, big current
C0
2
welding
C0
2
（
L/min
）
5
～
15
15
～
25
25
～
50
8.WELDING PARAMETERS TABLE
The option of the welding current and welding voltage directly influences the welding stability, welding quality and
productivity. In order to obtain the good welding quality, the welding current and welding voltage should be set optimally.
Generally, the setting of weld condition should be according to the welding diameter and the melting form as well as the
production requirement.
The following parameter is available for reference.
Parameter for butt
‐
welding (Please refer to the following figure.)
Plate
thickness
T (in)
Gap
g(in)
Wire
φ
(in)
Welding
current
（
A
）
Welding
voltage
（
V
）
Welding
speed
（
cm/min
）
Gas
volume
（
L/min
）
0.032
0
0.032~0.035
60~70
16~16.5
19.69~23.62
10
0.040
0
0.032~0.035
75~85
17~17.5
19.69~23.62
10~15
0.047
0
0.040
70~80
17~18
17.72~21.65
10
Wire
φ
(in)
Wire
φ
(mm)
Short circuit transition
Granular transition
Current
（
A
）
Voltage (V)
Current
（
A
）
Voltage (V)
0.024
0.6
40~70
17~19
160~400
25~38
0.030
0.8
60~100
18~19
200~500
26~40
0.040
1.0
80~120
18~21
200~600
27~40
