焊后热处理对塔机K型焊接节点疲劳寿命的影响

doi:10.13251/j.issn.0254-6051.2025.06.037

金属热处理 ›› 2025, Vol. 50 ›› Issue (6): 242-248.DOI: 10.13251/j.issn.0254-6051.2025.06.037

焊后热处理对塔机K型焊接节点疲劳寿命的影响

吴慧娟¹, 孙菁笛¹, 吕世宁¹, 吴靖凯², 高有山¹, 王爱红¹

1.太原科技大学机械工程学院, 山西太原 030024;
2.山西科技学院智能制造工程学院, 山西晋城 048011

收稿日期:2024-12-04 修回日期:2025-03-23 出版日期:2025-06-25 发布日期:2025-07-08
通讯作者: 高有山,教授,博士,E-mail:2003011@tyust.edu.cn
作者简介:吴慧娟(2000—),女,硕士研究生,主要研究方向为重型机械疲劳寿命评估与焊接残余应力的预测,E-mail:1505574903@qq.com。
基金资助:
山西省自然科学基金(20210302123217);山西省研究生科研创新项目(2023SJ257)

Effect of post weld heat treatment on fatigue life of K-welded joint in tower crane

Wu Huijuan¹, Sun Jingdi¹, Lü Shining¹, Wu Jingkai², Gao Youshan¹, Wang Aihong¹

1. School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan Shanxi 030024, China;
2. School of Intelligent Manufacturing Engineering, Shanxi Institute of Science and Technology, Jincheng Shanxi 048011, China

Received:2024-12-04 Revised:2025-03-23 Online:2025-06-25 Published:2025-07-08

摘要/Abstract

摘要： 为了评估残余应力及焊后热处理对塔式起重机疲劳寿命的影响程度,以塔机疲劳危险位置焊接节点为研究对象,建立了带有焊缝结构的K型焊接管节点模型,对其进行了基于生死单元法的焊接温度场、应力场模拟计算。研究了焊后热处理对焊接节点残余应力的影响。通过名义应力法对不同热处理工况下结构的疲劳寿命进行评估。结果表明,焊后热处理可以有效降低残余应力,残余应力下降速率随着热处理温度升高而降低。在考虑残余应力的情况下,结构疲劳寿命大幅下降,焊后热处理可在一定程度上提高结构的疲劳寿命。

关键词: K型焊接管节点, 残余应力, 热处理, 疲劳寿命预测

Abstract: In order to evaluate the effects of residual stress and post-welding heat treatment on the fatigue life of tower crane, a K-shaped welded pipe joint model with welded joint structure was established based on the welded joints at the fatigue-prone location of tower crane fatigue. The temperature field and stress field of the welded parts were simulated by the life-death element method. The effect of post-welding heat treatment on the residual stress of welded joints was studied. The fatigue life of structures under different heat treatment conditions was evaluated by nominal stress method. The results show that post-welding heat treatment can effectively reduce the residual stress, and the reduction rate of residual stress decreases with the increase of heat treatment temperature. Considering the residual stress, the fatigue life of the structure is obviously reduced, and the post-welding heat treatment can improve the fatigue life of the structure to a certain extent.

Key words: K-shaped welded pipe nodes, residual stress, heat treatment, fatigue life prediction

中图分类号:

TG404

吴慧娟, 孙菁笛, 吕世宁, 吴靖凯, 高有山, 王爱红. 焊后热处理对塔机K型焊接节点疲劳寿命的影响[J]. 金属热处理, 2025, 50(6): 242-248.

Wu Huijuan, Sun Jingdi, Lü Shining, Wu Jingkai, Gao Youshan, Wang Aihong. Effect of post weld heat treatment on fatigue life of K-welded joint in tower crane[J]. Heat Treatment of Metals, 2025, 50(6): 242-248.

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焊后热处理对塔机K型焊接节点疲劳寿命的影响

Effect of post weld heat treatment on fatigue life of K-welded joint in tower crane

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