On Welding Conditions of CO₂-O₂ Arc Welding (Report 2)

Relations between Welding Condition and Deposition Efficiency

Abstract

Using a constant potential type rectifier, many beads were deposited on plates by CO₂-O₂ arc welding, varying polarity, open voltage and feeding rate. And the deposition efficiency were measured. For the purpose of comparison, the same experiments were carried out with argon arc and manual arc welding with a coated electrode.
The experimental results are as follows :
1. At a constant feeding rate, the deoposition efficiency increased with the increment of open voltage.
2. At a constant open voltage, the deposition efficiency increased with the decrease of arc voltage and the increment of welding current.
3. In the case of CO₂-O₂ arc welding the deposition efficiency reaches 99% under an optimum condition.
4. The deposition efficiency with the straight polarity is not so good as with the reverse polarity. With straight polarity, the maximum efficiency did not over 90%.
5. Argon arc welding showed the same tendency as the CO₂-O₂ arc welding.
6. In the case of the manual arc welding with a coated electrode, the maximum deposition efficiency was 88%.