摘要
通过熔化极气体保护焊的方法,采用准1.2 mm的T Union GM 120实芯气保焊丝对FGS90WV钢管进行对接焊,对焊接接头显微组织进行了观察,并对接头拉伸、弯曲、冲击、硬度等力学性能进行了检测。结果表明,焊缝区组织为少量先共析铁素体+针状铁素体,淬火区组织为马氏体;随着热输入增加,焊缝组织中先共析铁素体含量增多,热影响区组织逐渐粗化;接头抗拉强度和屈服强度先小幅增加后迅速降低,伸长率和冲击韧性逐渐降低,当热输入小于11.5k J/cm时,接头具有良好的强韧性匹配;热影响区硬度逐渐降低,焊缝区硬度几乎不受影响,当热输入达到23.5 k J/cm时,热影响区硬度大幅下降。
Through gas metal arc welding method, 4）1.2 mm solid core welding wire T Union GM 120 was used for butt welding of FGS90WV steel, the microstructure of the welded joint were observed by optical microscopy, and the tensile, bending, impact and hardness mechanical properties were tested. The results show that, the microstructure of the weld zone is acicular ferrite and a small amount of pro-eutectoid ferrite. The microstructure of quenching zone is martensite. With the increase of heat input, the ferrite microstructure content in the weld increases, and the microstructure in heat affected zone gradually coarsens. The tensile strength and yield strength of the welded joints increases first and then decreases rapidly, the elongation and impact toughness decreases gradually, when the heat input wis less than 11.5 KJ/cm, the welded joint with good strength and toughness matches. The hardness of heat affected zone gradually decreases, while the hardness of the weld zone is not affected.When the heat input is up to 23.5KJ/cm, the hardness of heat affected zone decreases obviously.
出处
《热加工工艺》
CSCD
北大核心
2015年第21期216-218,共3页
Hot Working Technology
