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所属单位：材料科学与技术学院
发表刊物：MATERIALS RESEARCH EXPRESS
关键字：pores laser-MIG hybrid welding mild steel microstructure energy dispersive spectroscopy (EDS)
摘要：The purpose of the present study is to investigate pores formation mechanism in the laser-MIG hybrid welded joint of 20 mm thick mild steel. The microstructure and energy dispersive spectroscopy (EDS) of the welding joint are analyzed to verify the pores mechanism. Experimental results show that a well-formed weld bead can be obtained in the backing welding using a wide range of the process parameters. Besides, pores in the laser-MIG hybrid welded joints can be divided into two types, metallurgical pores, and process pores. The small, regular circle shaped metallurgical pores are generally concentrated in the upper part of the weld bead, which is mainly caused by insufficient pre-weld cleaning. In contrast, large, irregular shaped process pores are generally concentrated in the bottom of the weld bead, which is caused by the instability of the keyhole because of unreasonable welding parameters.
ISSN号：2053-1591
是否译文：否
发表时间：2019-09-01
合写作者：周曙君,凌万里,马婉萍,高奇玉,Lu, Weihua
通讯作者：占小红