摘要
为提高母材对激光的吸收率、改善焊缝成形,选取氧化物(SiO_(2)、TiO_(2))和氯化物(NaCl、KCl)作为活性剂对5 mm厚的TC4钛合金进行活性激光焊接。以活性剂对焊缝成形的影响为基础,进而分析了活性剂的作用机制和活性剂对接头组织性能的影响。结果表明,所选活性剂对焊缝的宏观成形无显著影响,4种活性剂均可通过提高母材对激光的吸收率影响焊缝的形状尺寸,影响程度与焊接热输入有关。SiO_(2)主要是通过降低光致等离子体对激光的吸收和散射作用,TiO_(2)主要是通过激光束在细小颗粒间多次反射传播作用,NaCl和KCl则是通过以上两种作用提高母材对激光的吸收率。涂敷SiO_(2)和TiO_(2)接头由于焊缝组织变化造成接头抗拉强度下降分别为14%和10%,涂敷NaCl和KCl接头抗拉性能不低于未涂敷接头,可以作为有效的活性剂用于TC4钛合金激光焊。
SiO_(2),TiO_(2),NaCl,and KCl are chosen as activating fluxes for laser welding of 5 mm thick TC4 titanium alloy to increase the laser absorptivity of base material and improve weld formation.Based on the influence of activating fluxes on weld formation,the mechanism of action of activating fluxes and their impact on the microstructure and properties of welded joints are analyzed.The experimental results show that the activating fluxes have no significant effect on the macro formation of the weld,and the four activating fluxes can affect the shape size of the weld by increasing the laser absorptivity related to welding heat input.Besides,SiO_(2)mainly reduces the absorption and scattering of laser beam by reducing photoinduced plasma,and TiO_(2)primarily reflects and propagates laser beam among the fine particles,NaCl and KCl have both.The tensile strength of the joint coated with SiO_(2)and TiO_(2)has descended by 14%and 10%respectively.It is related to the change of weld microstructure by activating fluxes.The tensile properties of the welded joints coated with NaCl and KCl are not lower than that of uncoated welded joints.They can be used as an effective activating flux for TC4 titanium alloy laser welding.
作者
侯继军
董俊慧
武晓芳
HOU Jijun;DONG Junhui;WU Xiaofang(School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Advanced Light Metals Development and Processing Protection Engineering Research Center of Ministry of Education,Inner Mongolia University of Technology,Hohhot 010051,China)
出处
《材料工程》
北大核心
2025年第6期136-144,共9页
Journal of Materials Engineering
基金
内蒙古自治区高校基本科研业务费项目(JY20230027)
内蒙古工业大学博士基金(BS2021001)。
关键词
活性激光焊
TC4钛合金
焊缝成形
组织性能
active laser welding
TC4 titanium alloy
weld formation
microstructure property
