薄い軟鋼板の突合せ溶接時の過渡応力と開先の変位挙動に関する研究 : 第2報

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This paper describes a further study on the problem of transient phenomena such as transverse forces acting on tack welds and deformation behavior of groove resulting from butt weld of thin mild steel plates. A series of tests on the transient behavior of butt welded joints is performed and experimentally obtained results are compared with those of theoretical calculations in which unsteady heat conduction analysis and uncoupled thermal elastic-plastic analysis are carried out by use of the finite element method as described in the previous report. The calculated results are fairly in good agreements with the experimental results. In the initial stage of butt welds, transverse forces acting on tack welds and deformation behavior of groove differ with presence of root gap significantly. However, as the weld progresses, the difference decreases gradually because influence of trailing stress field at the rear of the moving weld heat source becomes more predominant. Special attention is made to clear effect of welding speed closely relating with weld heat input on the transient behavior of butt welded joints. It is shown that, as a weld heat source approaches to end of weld, in case of slow speed welding transverse compressive force is generated on the end tack weld and the groove of the welded joint closes, while in case of high speed welding tensile force is generated on the end tack weld and the groove of the welded joint opens, and that closing or opening behavior of groove of butt welded joints may be specified by a parameter representing shapes of isothermal lines around a moving weld heat source.
社団法人日本船舶海洋工学会の論文

薄い軟鋼板の突合せ溶接時の過渡応力と開先の変位挙動に関する研究 : 第2報

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