This indicated that the fracture had initiated at the unfused butt weld in the longitudinal stiffener . 研究表明裂纹是从纵向加劲助未熔透的对接焊缝中起始的。
Some crack extension probably developed from the unfused section of the butt weld across the thickness of the stiffener during transport and erection . 有些裂纹可能在运输和安装过程中就从加劲肋对接焊未熔透处开始发展。
Industrial valves - butt welding ends for steel valves 工业阀门.钢阀门的对接焊接端