17
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
Wireφ(
in)
Short circuit transition
Granular transition
Current
（
A
）
Voltage (V)
Current
（
A
）
Voltage (V)
0.023
40~70
17~19
160~400
25~38
0.030
60~100
18~19
200~500
26~40
0.035
80~120
18~21
200~600
27~40