CO2 welding-Carbon dioxide gas shielded welding process 3/3
2021-12-30
Welding process parameters of CO2 gas shielded welding 2/3
2022-01-07Welding process parameters of CO2 gas shielded welding 1/3
In CO2 gas shielded welding, reasonable selection of welding process parameters is an important condition to ensure weld quality and improve production efficiency. The main parameters of CO2 gas shielded welding include welding wire diameter, welding current, arc voltage, welding speed, welding wire extension length, power supply polarity, gas flow, welding gun Angle, arc alignment position, nozzle height, etc.
Welding process parameters of wire diameter
The larger the diameter of the wire, the greater the welding current allowed, usually according to the thickness of the welding part, welding position and efficiency requirements to choose. When welding vertical, horizontal and inverted welds of thin plates or medium thick plates, welding wires with diameters less than 1.6mm are mostly used. In the specific welding process .The choice of wire diameter can be referred to right pic. Figure Choice of wire diameter shows the influence of the diameter of the welding wire on the penetration depth
| Wire diameter (mm) |
The thickness of the weldment (mm) | Welding position | Globular transfer |
| 0.8 | 1~3 | A variety of locations | short circuiting transfer |
| 1 | 1.5~6 | A variety of locations | short circuiting transfer |
| 1.2 | 2~12 Medium thickness | A variety of locations | short circuiting transfer |
| downward welding/flat fillet weld | Fine particle transition | ||
| 1.6 | 6~25 Medium thickness | A variety of locations | short circuiting transfer |
| downward welding/flat fillet weld | Fine particle transition | ||
| 2 | Medium thickness | downward welding/flat fillet weld | Fine particle transition |
When the welding current is the same, the welding depth increases with the decrease of wire diameter. The diameter of welding wire also has obvious influence on the melting rate of welding wire. When the current is the same, the thinner the wire, the higher the deposition speed. At present, the diameter of welding wire commonly used is 0.8mm, 1.0mm, 1.2mm and 1.6mm. Thick wires with diameters of 34.5mm are also currently in use at some weld locations.
Welding process parameters of welding current
| The relation between wire diameter and welding current | |
| Wire diameter(mm) | welding current(A) |
| 0.6 | 40~100 |
| 0.8 | 50~160 |
| 0.9 | 70~210 |
| 1 | 80~250 |
| 1.2 | 110~350 |
| 1.6 | >=300 |
As can be seen from the figure, with the increase of welding current, both the deposition speed and the fusion depth increase. However, it should be noted that when the welding current is too large, it is easy to cause burning through, welding leakage and cracks and other defects, and the deformation of the welding parts is large, and the splash is very big in the welding process; When the welding current is too small, it is easy to produce defects such as incomplete welding, incomplete fusion, slag inclusion and poor weld forming. In order to improve the production efficiency, a large welding current is usually used under the condition of guaranteeing the welding penetration and forming well. Welding process parameters is so important.