Abstract
The element transfer of Ti from molten flux to the weld metal is limited to less than 310 ppm Ti in the submerged arc welding of carbon steel. This limitation is due to the high oxygen partial pressure prevailing at the molten flux-weld pool interface. Our previous study illustrated that the use of Al powder in combination with Ti powder improves the transfer of Ti to the weld metal to 4% Ti, whilst maintaining 509 ppm O in the weld metal. The weld metal ppm O should be controlled at 200 to 500 ppm O to maintain weld metal toughness. In this study, the addition of Cu powder with Ti and Al powder is applied to illustrate the stabiliser effect of Cu in the weld pool. The role of Cu as weld pool stabiliser is due to its decrease of the temperature required to melt Ti into the weld pool, so increasing the quantity of metal powder melted into the weld pool. The weld metal composition improved to 5.1% Ti, 3.6% Cu, and 371 ppm O. Thus, the role of Al in controlling the partial oxygen pressure at the molten flux-weld pool interface is maintained in the presence of Cu powder.
Funder
National Research Foundation
Subject
Process Chemistry and Technology,Chemical Engineering (miscellaneous),Bioengineering
Reference35 articles.
1. Physical phenomena in the weld zone of submerged arc welding—A Review;Sengupta;Weld. J.,2019
2. Slag-metal equilibrium during submerged arc welding
3. Slag-metal reactions during welding: Part I. Evaluation and reassessment of existing theories
4. Sources of weld metal oxygen contamination during submerged arc welding;Eagar;Weld. J.,1978
5. Notch toughness of commercial submerged arc weld metal;Tuliani;Weld. Met. Fabr.,1969