吴鸿燕,张鑫,陈炯,等.30CrMnSi钢CO2焊接冶金缺陷形成机制研究[J].精密成形工程,2023,15(12):189-195.
WU Hong-yan,ZHANG Xin,CHEN Jiong,et al.Formation Mechanism of Metallurgical Defects in 30CrMnSi Steel during CO2 Welding[J].Journal of Netshape Forming Engineering,2023,15(12):189-195. |
| 30CrMnSi钢CO2焊接冶金缺陷形成机制研究 |
| Formation Mechanism of Metallurgical Defects in 30CrMnSi Steel during CO2 Welding |
| 投稿时间：2023-08-12 |
| DOI：10.3969/j.issn.1674-6457.2023.12.022 |
| 中文关键词: 30CrMnSi钢 CO2焊接 焊接冷裂纹 气孔缺陷 刚性拘束 |
| 英文关键词: 30CrMnSi steel CO2 welding welding cold crack porosity defects rigid restraint |
| 基金项目:九江职业技术学院2023年度校级虚拟仿真专项课题(20010101705) |
|
| 摘要点击次数: 1080 |
| 全文下载次数: 538 |
| 中文摘要: |
| 目的 解决30CrMnSi钢焊接性差，用CO2气体保护焊接时易产生裂纹、气孔等缺陷的问题。方法 通过刚性拘束焊接裂纹试验模拟某型飞机后边条盒段在实际焊接过程中母材所受到的拘束，针对焊接裂纹类型及形态，确定焊接裂纹的形成机制。同时，对焊缝中的气孔进行了分析。结果 接头中容易产生冷裂纹，在高应力条件下，应力集中发生在微裂纹尖端，最终在氢的影响下开裂。结论 采用能量密度比较集中的TIG焊替代原来采用的CO2气体保护焊有利于减少或消除气孔缺陷。可以通过优化结构设计和焊接次序，降低应力集中，来减轻焊接热作用对裂纹敏感性的影响。同时，避免在拐角处或焊接可达性差的位置施焊，可以降低气孔率。 |
| 英文摘要: |
| The work aims to solve the problems of cracks, pores and other defects in 30CrMnSi during CO2 gas shielded welding due to poor weldability. A rigid restraint welding crack test was conducted to simulate the restraint of the base metal during the actual welding process of the rear box section of a certain aircraft, and the formation mechanism of the welding crack was determined according to the types and forms of welding cracks. At the same time, the porosity in the weld was analyzed. Cold cracks were easy to occur in the joint. Under high stress conditions, stress concentration occurred at the tip of the micro-crack, and finally a cold crack penetrating the weld was formed under the effect of hydrogen. TIG welding with relatively concentrated energy density is considered to replace the original CO2 gas shielded welding, which is also conducive to reducing or eliminating porosity defects. The structural design and welding sequence can be optimized to reduce stress concentration, thereby reducing the effect of welding heat on crack sensitivity. At the same time, welding should be avoided at corners or positions with poor welding accessibility, so as to effectively reduce porosity. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
渝公网安备 50010702501719号