摘要
现代焊接结构对焊接质量的要求越来越高.焊缝金属的内部组织及其结构显著影响焊接接头的性能.为了通过控制焊接接头内部的晶粒形态和尺寸来提高焊接接头的性能,利用纵向磁场发生装置进行了低碳钢MIG焊接实验,对焊缝金属进行了金相及力学性能试验.结果表明,外加纵向磁场作用下与不加磁场进行比较,焊缝的抗拉强度提高了37.79%,焊缝的抗冲击韧性比不加磁场时增加了72.21%.可见外加纵向磁场焊接可以有效地细化焊缝的晶粒,提高焊接接头抗拉强度以及冲击韧性等力学性能.
The request for welding quality in modern welded structures is increasingly high. The microstructure of welding metal has a remarkable influence on the properties of welding joint. In order to control both morphology and size of the grains in the welding joint and to enhance the welding quality, the longitudinal magnetic field was used for the MIG welding of mild steel. In addition, the microstructural observations and the mechanical property tests were performed for the welding joint. The experimental results reveal that for the welding joint with the longitudinal magnetic field, the ultimate tensile strength increases by 37.79% and the impact ductility increases by 72.21%, compared with the welding joint without the magnetic field. The application of the longitudinal magnetic field during welding can effectively refine the grains, and improve the ultimate tensile strength and impact ductility of the welding joint.
出处
《沈阳工业大学学报》
EI
CAS
2007年第4期385-387,395,共4页
Journal of Shenyang University of Technology
基金
辽宁省自然科学基金资助项目(20052039)
辽宁省博士启动基金资助项目(2001102028)
关键词
低碳钢
MIG焊
纵向磁场
力学性能
焊缝组织
mild steel
MIG welding
longitudinal magnetic field
mechanical property
microstructure
作者简介
常云龙（1963-），男，山西新绛人，教授，博士，主要从事焊接设备及自动化等方面的研究．
