摘要
从流体动力学及传热学角度出发,基于FLUENT软件建立了激光-电弧复合热源焊保护气体流场的数值分析模型,对不同条件下保护气体流态进行模拟计算,分析其流体动力学特征及不同保护模式对熔池保护效果的影响。结果表明,对于激光前置复合焊过程,无保护气室时,保护气体对熔池前部保护稍好,而对熔池后部则保护效果较差;当采用保护气室时,熔池前部保护有较大改善,但由于空气回流,熔池后部同样保护较差;而当改进保护气室后部结构后,较好地抑制了空气回流,实现了对整个熔池及其附近焊缝的有效保护,为增强复合焊熔池保护效果及保护气室的优化设计提供基础数据。
Based on the theories of hydrodynamics and heat transfer,a numerical analysis model for flow field of shielding gas in laser + TIG hybrid welding was developed using FLUENT commercial code. The flow patterns of shielding gas under different conditions were simulated and the characteristic of flow dynamic as well as the influence of protection mode on protection effect of weld pool were analyzed. The results shows that,under the condition that laser is leading,the front part of hybrid weld pool can be protected slightly well by shielding gas without protective box but the protective effect of its rear part is poor. When using the shielding gas chamber,the protection of weld pool front part is improved obviously and for rear part,the case changed quite limitedly due to backflow of air. While the rear structure of shielding gas chamber is modified,the backflow of air is suppressed effectively,achieving the excellent protection of whole weld pool as well as weld bead near it,which lays foundations for the enhancement of protective effect of weld pool and design of shielding gas chamber.
出处
《焊接》
北大核心
2016年第5期12-16,73,共5页
Welding & Joining
基金
国家自然科学基金(51575252)
江苏省本科创新项目
江苏科技大学本科创新项目
关键词
复合焊
保护气体
流体流动
数值模拟
hybrid welding
shielding gas
fluid flow
numerical simulation
