Effect of Scanning Path on Laser Spot Welding Forming Characteristics and Microstructure,Properties of DP780 Dual-phase Steel
In order to explore the process characteristics of laser welding DP780 duplex steel,the laser spot welding experiment of DP780 duplex steel under different scanning paths was carried out to compare the influence of different scanning path on the weld formation,microstructure and tensile shear property.The results show that the weld microstructure of laser spot welding in different scanning paths is similar:the weld area is lath martenite,bainite and a small amount of ferrite;the heat affected zone is uneven massive ferrite,ferrite and a small amount of martenite.However,after application of different scanning methods,the ferrite and bainite in the weld increases in some extent,and the size of martensite is reduced.The average hardness of the weld area of the scanning laser welding joint is reduced,and the minimum hardness of the softening area increases.Laser scanning welding increases the width of the weld,decreases the weld penetration,and can inhibit the formation of pores.The fracture of the scanning laser welding joints is mainly composed of smooth interface and dimples.
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