中空45~#钢棒材摩擦焊接工艺研究

发布时间：2019-04-19 19:40

【摘要】：为了改善大直径中空45~#钢棒材的连续驱动摩擦焊接性,采用二级加压方法进行了外径42 mm,内径26 mm的45~#钢连续驱动摩擦焊接.试验结果表明,焊接热输入随着摩擦时间、旋转速度的增大而增大,当摩擦时间较短、旋转速度较低时,采用较大的顶锻力、二级摩擦力不能显著增加焊接热输入,导致无法顶锻,产生严重的焊接缺陷.对于无缺陷接头,接头最大强度系数达到80.9%,接头中未发现熔化现象,焊缝发生动态再结晶,热机影响区和部分正火区出现魏氏体组织.接头冲击试验发现,力学性能优异的接头薄弱区位于部分正火区,而焊接热输入较高的接头薄弱区位于热机影响区.焊接热输入较低难于获得缺陷的焊接接头,焊接热输入过大显著降低接头力学性能.
[Abstract]:In order to improve the continuous driving friction weldability of large diameter hollow 45 # steel bar, the continuous driving friction welding of 45 # steel with the outer diameter of 42 mm, and the inner diameter of 26 mm was carried out by two-stage pressure method. The experimental results show that the welding heat input increases with the increase of friction time and rotation velocity. When the friction time is shorter and the rotation speed is lower, the welding heat input can not be significantly increased by the use of larger top forging force, and the second friction force can not significantly increase the welding heat input, when the friction time is shorter and the rotation speed is lower. It leads to no upforging, resulting in serious welding defects. For the defect-free joint, the maximum strength coefficient of the joint reached 80.9%, no melting phenomenon was found in the joint, dynamic recrystallization occurred in the weld, and Weissite structure appeared in the heat affected zone and part of the normalizing zone. The joint impact test shows that the weak zone of the joint with excellent mechanical properties is located in part of the normalizing zone, while the weak zone of the joint with higher welding heat input is located in the influence zone of the heat engine. When welding heat input is low, it is difficult to obtain defective welded joint, and welding heat input is too large to significantly reduce the mechanical properties of welded joint.
【作者单位】：陕西理工学院机械工程学院;陕西理工学院材料科学与工程学院;
【基金】：陕西省教育厅服务地方专项资助项目(15JF04);陕西省教育厅资助项目(2013JK1039)
【分类号】：TG453.9

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