摘要
By measuring and analyzing infrared thermal image of the specimen in static load tensile test process, it was studied that the influence of the undercut defects and double-sided dressing method on the deformation behavior of the laser welded joint specimens of TC4 titanium alloy. The results showed that for the unmodified specimens, the yield phenomenon occurs first in the region of the joint, but the undercut value has an effect on the stress and strain of starting to yield phenomenon, and a great effect on the plastic deformation behavior.When the undercut is less than a certain value, the large plastic deformation occurs in the base metal region and the plasticity of the specimen is comparable to that of the base metal, but the larger undercut defect results in a concentrated plastic deformation in the joint region and rapidly failed in this region. But the double-sided dressing specimen is significantly different. The physical yield is no longer concentrated in the joint region, but at the same time occurs in the several regions including joint and the base metal. And the plastic deformation mainly occurs in the base material area, similar to that of the base material.
作者
Duan Aiqin
Wang Zhenshu
Peng Huan
Ma Xuyi
段爱琴;王振书;彭欢;马旭颐(Science and Technology on Power Beam Process Laboratory,Beijing Aeronautical Manufacturing Technelogy Research Institute,Beijing 100024,China)
基金
Project was supported by National Defense Basic Scientific Research Program of China (JCKY2016205A001)。
