作者：谈杰, 王立忠, 梁晋, 杨洪期

作者单位：西安交通大学机械工程学院 机械制造系统工程国家重点实验室, 陕西 西安 710049

关键词：低合金高强钢;数字图像相关法;焊接过程;三维全场变形

摘要：

针对低合金高强钢薄板在焊接过程中变形的不确定性及复杂性，提出一种基于数字图像相关法的测量方法。该文以Q345和Q690薄板对比试验进行分析，得到两块薄板的三维全场焊接变形。试验结果表明：Q690和Q345薄板在焊接过程中总体变形趋势一致，都经历中间凸起，恢复，四周翘起，最终成马鞍形；但强度更高的Q690薄板在焊接过程中变形趋势更缓，变形曲线图中的拐点出现得更迟；冷却到最后，Q690薄板关键点变形比Q345薄板小。研究结果可为揭示低合金高强钢薄板焊接变形机理提供可靠依据。

Research of 3D full-field welding deformation on low-alloy high-strength thin plate
TAN Jie, WANG Lizhong, LIANG Jin, YANG Hongqi
State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
Abstract: As the uncertainty and complexity of deformation of low alloy high strength steel sheet during the welding process, a measurement method based on digital image correlation method was put forward to solve the problem. In this paper, Q345 and Q690 thin plates were comparatively tested and got the three-dimensional and full-field welding deformation of the two thin plates. The results show that the overall deformation trend of Q690 and Q345 plate in the welding process is the same, which experienced middle protruding and recovery, then the edges up, and eventually became saddle shape. However, with higher intensity, Q690 plate has slower deformation and the inflection point in the deformation curve is later. Until the end, the deformation of key points of Q690 is smaller than Q345. This conclusion provides a reliable basis for revealing the welding deformation mechanism of low alloy high strength steel sheet.
Keywords: low-alloy high-strength plate;digital image correlation method;welding process;3D full-field deformation
2019, 45(2):30-35  收稿日期: 2018-01-21;收到修改稿日期: 2018-02-26
基金项目: 国家自然科学基金项目（51675404，51421004）
作者简介: 谈杰(1994-),男,陕西安康市人,硕士研究生,专业方向为光学测量以及薄板焊接变形测量
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