摘要
焊接过程是一个迅速而又极不均匀的物理化学冶金过程,焊接熔池一直是焊接模拟的一个重要领域。根据能量守恒的基本原理和钨极氩弧焊(TIG)工艺的特点,建立了运动电弧作用下紫铜非稳态TIG焊接熔池形态的数值分析模型,分析中引入了热焓的概念和表面双椭圆分布的热源模型,较好地满足了TIG焊接数值模拟的要求。在不预热的情况下采用Ar+N2对厚壁紫铜进行了TIG焊接的研究,并在不同工艺参数下将试验值与计算值进行了比较。结果表明,计算的结果与实际测量的结果较为吻合,证明了模型的可靠性和正确性。
Welding process is a rapid and quite non-uniform physicochemical metallurgy process, and molten pool is always one of the important areas for welding simulation. According to the principle of conservation of energy and characteristics of tungsten inert gas (TIG) welding, the numerical model of non-steady TIG welding pool shape under moving arc was established. The heat enthalpy conception and the heat model of surfaced bielliptic distribution were introduced and the demands of welding numerical simulation was primely satisfied. The TIG welding of thick-wall pure copper adopting Ar + N2 without preheating was studied. The comparison between the experiment value and the calculation with different process parameters showed that the model and practical course match well, and the reliability and correctness of the model are proved.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2006年第5期1-4,共4页
Transactions of The China Welding Institution
基金
国家863高技术研究发展计划项目(2003AA305970)
关键词
不预热
紫铜
钨极氩弧焊
温度场
数值模拟
Computer simulation
Copper
Mathematical models
Preheating
Temperature distribution
