Production weld tests were usually conducted in steel fabrication industries to ascertain the process reliability and product quality. Plate groove butt joint test specimens, prepared from production weld test coupon, were failed during the mechanical test. To analyse the root cause for joint failure, a series of tests were conducted on prepared samples from production weld test. The macro-examination was conducted at the failed region, and microstructure analysis was carried out by optical microscopy and scanning electron microscopy on the banded structure of the base metal and at heat-affected zone. The purpose of this investigation is to identify the effect of the non-metallic inclusions in the segregated banded zone during welding of plate butt joint and to identify the impurity elements responsible for the weld failure. From this investigation, it was found that the presence of manganese sulphide, lead sulphide and aluminium oxides in the segregated zone decreased the mechanical properties of the plate groove butt joint weld in terms of failure.

生产焊接测试通常在钢铁制造行业中进行，以确定过程的可靠性和产品质量。由生产焊接测试试样制备的板坡口对接测试样品在机械测试过程中失败。为了分析导致接头失效的根本原因，对生产焊接测试中准备好的样品进行了一系列测试。在失效区域进行宏观检查，并通过光学显微镜和扫描电子显微镜对母材的带状结构和热影响区进行微观结构分析。这项研究的目的是确定板对接焊接过程中偏析带状区中非金属夹杂物的影响，并确定造成焊接失效的杂质元素。