东北大学学报:自然科学版 ›› 2020, Vol. 41 ›› Issue (2): 208-212.DOI: 10.12068/j.issn.1005-3026.2020.02.010

• 材料与冶金 • 上一篇    下一篇

起重机车架用Q345B/HG785D钢板焊接实验研究

齐鹏远1,2, 刘家奇3, 王刚2, 刘相华1   

  1. (1. 东北大学 材料科学与工程学院, 辽宁 沈阳110819; 2. 营口理工学院 材料科学与工程系, 辽宁 营口115014;3. 北汽越野车研究院 试制部, 北京101300)
  • 收稿日期:2019-07-15 修回日期:2019-07-15 出版日期:2020-02-15 发布日期:2020-03-06
  • 通讯作者: 齐鹏远
  • 作者简介:齐鹏远(1981-),男,辽宁营口人,东北大学博士研究生,营口理工学院副教授; 刘相华(1953-),男,黑龙江双鸭山人,东北大学教授,博士生导师.冯明杰(1971-), 男, 河南禹州人, 东北大学副教授; 王恩刚(1962-), 男, 辽宁沈阳人, 东北大学教授,博士生导师.
  • 基金资助:
    辽宁省自然科学基金资助项目(20180550516); 辽宁省教育厅科学研究基金资助项目(L2019005).

Experimental Study on Welding of Q345B/HG785D Steel Plates in Crane Frame

QI Peng-yuan1,2, LIU Jia-qi3, WANG Gang2, LIU Xiang-hua1   

  1. 1. School of Materials Science & Engineering, Northeastern University, Shenyang 110819, China; 2. Department of Materials Science and Engineering, Yingkou Institute of Technology, Yingkou 115014, China; 3. Prototyping Department, Beijing Automotive Off-Road Vehicle Institute, Beijing 101300, China.
  • Received:2019-07-15 Revised:2019-07-15 Online:2020-02-15 Published:2020-03-06
  • Contact: LIU Xiang-hua
  • About author:-
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摘要: 以异种钢板Q345B与HG785D端头对焊为研究对象,通过在不同焊接热输入工艺条件下的MAG焊(熔化极活性气体保护电弧焊),对其端头焊接缺陷、力学性能及组织进行实验研究.实验发现:异种钢板端头对焊中,减小焊接电流可有效提高焊接接头强度;焊前预热、焊后缓冷可减少焊接接头的淬硬组织,提高焊接热影响区韧性.在焊接电流为140~200A、电压为22~24V、焊接速度为28cm/min的热输入条件下,采用预热+后热焊接工艺,焊接接头力学性能和弯曲特性可得到最佳效果.合理的焊接工艺可有效抑制汽车起重机车架焊缝开裂.

关键词: Q345B钢, HG785D钢, 异种钢板对焊, MAG焊, 焊接工艺, 焊接质量

Abstract: Taking butt welding of dissimilar steel plates of Q345B and HG785D as the object, we studied the welding defects, mechanical properties and microstructures of the welded joint by metal active gas(MAG)arc welding under different heat input conditions. It is found that the strength of the welded joint can be improved effectively by reducing welding current in butt welding of dissimilar steel ends. When the joint is preheated before welding and slowly cool down after welding, the quenched hard area in the microstructure is reduced and the toughness of heat affected zone(HAZ)is increased. Under the heat input conditions of 140-200A welding current, 22-24V welding voltage and 28cm/min welding speed, the mechanical and bending properties of the welded joint can be optimized by the process of preheating and post-heat welding. The optimized welding process can inhibit the weld cracking effectively in crane frame.

Key words: Q345B steel, HG785D steel, butt welding of dissimilar steel, MAG welding, welding process, welding quality

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