Development of Non-Scallop Block Joint Welding Method

Abstract A weld scallop is a small quadrant or half circle type hole installed in the weld line cross area for easy welding operation. Many types of T-bars with a scallop can be welded in a block assembly stage in shipbuilding. The difficulties arise from the fact that scallops are to be filled by build-up welding after welding of the cross line is complete. In this study, a non-scallop block joint welding method was developed using special type CBM (ceramicbacking material). The wedge shaped CBM was devised to insert a CBM into just the V groove of weld line crossarea without weld scallop. A saw-toothed shape was adopted for easy cutting of the unnecessary part in the CBMfitting process. The applicability of the developed method was verified through welding experiments based on the yardwelding conditions. Key Words : Weld scallop, Build-up welding, Block assembly stage, CBM(ceramic backing material) 이 논문은 2014학년도 동의대학교 교내연구비에 의해 연구되었음(2014AA007). * Corresponding Author : Dae-Eun Ko(Dong-Eui Univ.)Tel: +82-51-890-2594 email: deko@deu.ac.krReceived May 8, 2014 Revised June 17, 2014 Accepted September 11, 2014