65Mn弹簧钢焊接接头缺陷及焊接性能研究
Study on Welding Joint Defects and Properties of 65Mn Spring Steel

为了研究65Mn弹簧钢的焊接性能，采用焊接成分模拟、焊接过程模拟、焊接缺陷检测以及缺口敏感性等对65Mn弹簧钢焊接接头进行了研究。结果表明：65Mn弹簧钢焊接接头的主要相成分为马氏体/贝氏体复相组织；65Mn钢焊接每一焊道设置的焊后冷却时间为180 s；刀片3焊接接头的焊缝内缺陷分布较为集中；65Mn钢焊接焊缝区存在大量缺陷，缺陷主要有三类：呈圆形或椭圆形的白色斑点、宏观的夹渣等缺陷、线性分布的微观裂纹；65Mn钢和65Mn钢焊接接头的缺口敏感度均值大于1，均对缺口均不敏感。
In order to study the welding properties of 65Mn spring steel, the welding joints of 65Mn spring steel were studied with the simulation of welding composition, welding process, welding defects detection and notches sensitivity. The results show that the main phase compositions of the welded joint of 65Mn spring steel were Martensite/Bainite duplex structure; the post weld cooling time of 65Mn steel was 180s for each weld bead; the defects distribution in the weld zone of the No.3 Blade welding joint were relatively concentrated. There are a lot of defects in the weld zone of 65Mn steel. There were three main types of defects: round or oval white spots, macroscopic slag inclusion and linear distribution micro-cracks. The average notch sensitivity ratios of 65Mn steel and 65Mn steel welded joints are more than one, and they are not sensitive to the notch.