焊接现场
机械制造文摘一一焊接分册
钛质波纹管膨胀节焊接工艺秦建”，李世乾”，陈友恒”，张汇文”，吕晓春”，王庆江
（1.洛阳船舶材料研究所，河南洛阳471000；2.机械科学研究院哈尔滨焊接研究所，黑龙江哈尔滨150028）摘要：采用自动TIG焊对0.5mm厚TA2材质的波纹管管坏纵缝进行了焊接，并对焊接接头拉伸性能、弯曲性能、显微组织及断口形貌进行了试验。试验结果表明：焊接工艺参数选用合理，焊缝成形良好，无损检测结果满足要求；焊缝及热影响区均为锯齿状α组织；焊接接头力学性能优良，抗拉强度达到500MPa，与母材强度相当，断裂形式为典型的韧性断裂，断后伸长率达到80%，面弯及背弯性能满足标准要求，能够满足波纹管压制要求。
关键词：TA2板；钨极氨弧焊；波纹管膨胀节；显微组织；工艺中图分类号：TG457
Welding technology of TA2 bellows expansion joints
Qin Jian';Li Shiqian';Chen Youheng';Zhang Huiwen’;Lv Xiaochun’;Wang Qingjiang
(1. Luoyang Ship Material Research Institute,Luoyang 471000,China;
2. Harbin Welding Institute, Harbin 150028,China)
Abstract: The longitudinal seam of the bellows expansion joint made of TA2 material with 0. 5 mm thickness was welded by gas tungsten arc welding. The tensile and flexural properties, microstructure and fracture mor-phology of the welding joint were studied.The results show that both well appearance and nondestructive testing results meet the requirements by using reasonable welding parameters. Moreover, the microstructure of welding joint and HAZ were both jagged α organization. The excellent mechanical properties of the joints were obtained, the tensile strength reached 500 MPa which is equal to base metal, and the fracture morphology was typical duc-tile fracture of dimple, elongation rate reached 80%. The performance of surface and back bending can meet
the standard, which can meet the requirements of the bellows expansion joints pressing Key words: TA2 ; GTAW;bellows expansion joints ; microstructure;technolog)
0前言
波纹管膨胀节是由波纹管及结构件组成，用来吸收热胀冷缩等原因引起的设备或管道位移与变形，是对受热管道和设备进行热补偿的关键部件。波纹管膨胀节不同于设备或管道一般的受压元件或管道组成件，它不但承受设备或管系的压力，要满足强度要求，
202016年第6期万方数据
还需要满足设备或管系的震动和柔性要求。对于承受内压和温差变形的设备、管道，补偿内压引起的一次应力和温差变形引起的二次应力，满足交变载荷和疲劳寿命的要求；对于大型设备、管系和高层建筑，吸收地下沉积，补偿位移变形能力，满足结构和安全；吸收振源引起的管道震动，吸振隔振，结构密封，满足安全运行。正因为波纹管膨胀节有上述功能，波纹管现已广