高级检索

钛合金激光立焊烧穿和气孔缺陷及其数值模拟

DorukYelkenci,陈俊宏,温鹏,常保华,单际国

DorukYelkenci,陈俊宏,温鹏,常保华,单际国. 钛合金激光立焊烧穿和气孔缺陷及其数值模拟[J]. 焊接学报, 2019, 40(1): 10-14. DOI: 10.12073/j.hjxb.2019400003
引用本文: DorukYelkenci,陈俊宏,温鹏,常保华,单际国. 钛合金激光立焊烧穿和气孔缺陷及其数值模拟[J]. 焊接学报, 2019, 40(1): 10-14. DOI: 10.12073/j.hjxb.2019400003
shu
DORUK Yelkenci, CHEN Junhong, WEN Peng, CHANG Baohua, SHAN Jiguo. Burn through holes and porosities during laser welding of titanium alloy in vertical position and their numerical model[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(1): 10-14. DOI: 10.12073/j.hjxb.2019400003
Citation: DORUK Yelkenci, CHEN Junhong, WEN Peng, CHANG Baohua, SHAN Jiguo. Burn through holes and porosities during laser welding of titanium alloy in vertical position and their numerical model[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(1): 10-14. DOI: 10.12073/j.hjxb.2019400003
shu

钛合金激光立焊烧穿和气孔缺陷及其数值模拟

Burn through holes and porosities during laser welding of titanium alloy in vertical position and their numerical model

摘要

    摘要
  • 摘要: 采用在平焊优化过的激光焊接参数对钛合金进行立焊，立向上焊时烧穿倾向较大，气孔倾向较小；立向下焊时烧穿倾向较小，气孔倾向较大. 基于体积分数法(VOF)建立了追踪小孔界面的数值计算模型模拟小孔和熔池流动行为，分析了焊接位置对激光立焊烧穿和气孔倾向的影响机制. 结果表明，立向上焊时焊接方向与重力相反，小孔所受静水压力较小，小孔易于长大，小孔空腔所需的液态金属得不到有效补充，烧穿倾向增加. 立向下焊时焊接方向与重力一致，小孔振荡导致崩塌卷气，所生成的气泡缺乏逸出通道，气孔倾向增加.
    Abstract: Titanium alloy plates were welded by laser under vertical positions with the optimized parameters obtained by flat welding positions. For vertical up (VU) welding, burn through holes occurred while the porosity was low. For vertical down (VD) welding, burn through holes didn’t occur while the porosity was high. With volume of fraction (VOF) method, a numerical model was established to track the interface of keyhole, which helped to understand the effect of welding positions on burn through holes and porosity. During VU welding, the welding direction was opposite to gravity, and the hydrostatic force on keyhole was small. The keyhole was easy to be expanded. When the liquid metal could not fill in the cavity of keyhole in time, burn through holes occurred. During VD welding, the welding direction was the same as gravity. The oscillation of keyhole size resulted to the collapse of keyhole and the entrapment of gas. Since there was lack of escape ways for entrapped gas, porosity increased during VD welding.
    • HTML全文
    • 参考文献(7)
  • [1] Guo W, Liu Q, Francis J A, et al. Comparison of laser welds in thick section S700 high-strength steel manufactured in flat (1G) and horizontal (2G) positions[J]. CIRP Annals - Manufacturing Technology, 2015, 64(1): 197 ? 200.
    [2] Sohail M, Han S W, Na S J, et al. Numerical investigation of energy input characteristics for high-power fiber laser welding at different positions[J]. The International Journal of Advanced Manufacturing Technology, 2015, 80: 931 ? 946.
    [3] Goussain J A, Becker A, Chehaibou A, et al. Heavy-section welding with very high power laser beams: the challenge[C]//The International Society for Optics and Photonics. Proceedings volumn 3097: Laser and Optics in Manufacturing Ⅲ. Munich: SPIE, 1997: 118 – 128.
    [4] Chang B H, Yuan Z, Pu H T, et al. Study of gravity effects on titanium laser welding in the vertical position[J]. Materials, 2017, 10(9): 1031.
    [5] 汪任凭, 雷永平, 史耀武. 激光深熔焊中匙孔形成过程的动态模拟[J]. 焊接学报, 2010, 31(11): 38 ? 40
    Wang Renping, Lei Yongping, Shi Yaowu. Numerical investigation of keyhole state for laser welding[J]. Transactions of the China Welding Institution, 2010, 31(11): 38 ? 40
    [6] Zhao H Y, Niu W C, Zhang B, et al. Modelling of keyhole dynamics and porosity formation considering the adaptive keyhole shape and three-phase coupling during deep-penetration laser welding[J]. Journal of Physics D-Applied Physics, 2011, 44(48): 485302.
    [7] Xu G X, Wu C S, Qin G L, et al. Adaptive volumetric heat source models for laser beam and laser + pulsed GMAW hybrid welding processes[J]. International Journal of Advanced Manufacturing Technology, 2011, 57: 245 ? 255.
    • 相关文章
    • 施引文献
    • 资源附件(0)
计量
  • 文章访问数:  784
  • HTML全文浏览量:  17
  • PDF下载量:  22
  • 被引次数: 0
出版历程
  • 收稿日期:  2018-06-02

目录

摘要
HTML全文
    参考文献(7)
    相关文章
    施引文献
    资源附件(0)

    /

    返回文章
    返回

    网站版权 © 焊接杂志社焊接学报编辑部电话：0451-86323218地址：哈尔滨市松北区创新路2077号

    本系统由 北京仁和汇智信息技术有限公司 开发  百度统计