Abstract
Al assisted alloying of carbon steel in Submerged Arc Welding (SAW) by Al-Cr-Ti-Cu unconstrained metal powders is applied. A base case without metal powder additions is compared to two metal powder addition schedules, Al-Cu-Ti and Al-Cu-Ti-Cr. Al powder is used as a deoxidiser element to control the oxygen partial pressure at the weld pool–molten flux interface to ensure that most of the Ti and Cr metal powder is transferred into the weld pool and that the weld metal ppm O is controlled within acceptable limits of 200 to 500 ppm O. The likely sequence of alloy melt formation is deduced from the relevant alloy phase diagrams. The effect of Fe addition into the initial Al-Cu-Ti and Al-Cu-Ti-Cr alloy melt is illustrated in thermochemical calculations. Increased metal deposition productivity with metal powder addition in SAW is confirmed. The metal deposition rates increased by 19% and 40% when Al-Cu-Ti and Al-Cu-Ti-Cr powders were applied at the same weld heat input used in the absence of metal powder additions.
Highlights
We demonstrated the alloying of carbon steel weld metal in Submerged Arc Welding (SAW) via unconstrained metal powders of Ti and Al, Cr and Al, and Ti-Cu-Al, respectively [18,19,29]
Namely the Base Case (BC), zero metal powder was added in the welding process
Equal mass quantities of Al, Ti, and Cu metal powders were added in the welding process to form MP3 weld metal
Summary
Submerged Arc Welding (SAW) is a high productivity welding method used in heavy engineering industries to join thick steel plates together to build large structures, for example, container ships [1]. Heat input in the SAW process is made via an arc formed between the weld wire tip and the steel base plate. The arc is covered by a layer of molten flux (slag) formed from melting the unmelted flux cover positioned at the edge of the arc cavity. The weld wire and flux are continuously fed through the welding head arrangement. The welding head is attached to a moving carriage which travels along the weld length
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
