Development of Adaptive Fill Control for Multitorch Multipass Submerged Arc Welding
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A significant portion of the total manufacturing time for a pipe fabrication process is spent on the welding following the primary machining and fit-up processes. To achieve a reliable weld bead appearance, automatic seam tracking and adaptive control to fill the groove are urgently required. For seam tracking in the welding processes, vision sensors have been successfully applied. However, the adaptive filling control for a multitorch system for the appropriate welded area has not yet been implemented in the area of submerged arc welding (SAW).
This paper describes several advances in sensor and process control techniques for applications in SAW which combine to give a fully automatic system capable of controlling and adapting the overall welding process. This technology has been used in longitudinal and spiral pipe mills and in pressure vessel production.
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