表面技术2017，Vol.46Issue(7)：208-212,5.DOI:10.16490/j.cnki.issn.1001-3660.2017.07.035
超声冲击处理工艺对Q345焊接热影响区残余应力的影响
Effect of Ultrasonic Impact Treatment Technology on Residual Stress of Q345 HAZ
马国 1张立平 2刘夕 1孟庆禹 1吴斌 1王勇 3张升霞 3杨超2
作者信息
- 1. 江苏徐州工程机械研究院,江苏 徐州 221004
- 2. 徐工集团工程机械有限公司 高端工程机械智能制造国家重点实验室,江苏 徐州 221004
- 3. 徐州徐工挖掘机械有限公司,江苏 徐州 221004
- 折叠
摘要
Abstract
The work aims to reduce residual stress of Q345 HAZ. The residual stresses of the HAZ symmetrical position on both weld sides were assumed to be consistent, then residual stresses were measured in blind-hole method for verification. HAZ on one side of weld was subject to shock treatment using ultrasonic impact machine with different technological parameters,then residual stresses on both sides were measured and compared. Removal rate was used to evaluate elimination effect. Difference between residual stresses on both sides of weld fell within 7.5% of maximum principal stress. Surface tensile stress of HAZ could be transformed into compressive stress by UIT, removal rate was 88%~130%. When impact time was unvarying, as removal rate of impact current increased, but the trend became slower. When impact current was unvarying, impact time had slight effects on removal rate. The stresses in HAZ symmetrical position on both sides of weld can be deemed to be equal. Impact cur-rent increase can bring about UIT impact increase, leading to further plastic deformation and dislocation motion on HAZ sur-face, and further improve removal rate of residual stress. Work hardening slowed down the increase trend of removal rate. UIT impact is unvarying when current is unvarying, increasing impact time don't affect removal rate significantly.关键词
焊接残余应力/超声冲击处理/盲孔法/消减率/热影响区表面Key words
welding residual stress/ultrasonic impact treatment (UIT)/blind-hole method/removal rate/HAZ surface分类
矿业与冶金引用本文复制引用
马国,张立平,刘夕,孟庆禹,吴斌,王勇,张升霞,杨超..超声冲击处理工艺对Q345焊接热影响区残余应力的影响[J].表面技术,2017,46(7):208-212,5.
