摘要
利用由等离子电弧(PAW)与钨极电弧(TIG)构成的单电源双面电弧焊接(DSAW)工艺可以获得深宽比较大的焊缝,该工艺具有高效、低成本的特点,是一种先进焊接技术。本文综合考虑影响等离子弧小孔形成的等离子流力、重力、表面张力等力学因素,建立了小孔形成过程的数学模型,并以此为基础建立了DSAW电流密度分布和焊接传热的控制方程。采用数值模拟技术对上述方程进行耦合求解,定量分析了双面电弧焊接条件下的传热规律及热影响区性能,同时作为对比也模拟了PAW焊接的传热现象,揭示了DSAW大幅度增加熔深、改善热影响区性能的机理,为工艺参数优化设计提供了依据。
Comparatively deep and wide welds can be attained in double-sided arc welding (DSAW) with single power supply consisting of PAW (plasma-arc) and TIG (tungsten-arc). PAW+TIG double-sided arc welding is an advanced manufacturing technology with the performance of high efficiency and low cost. The mathematic models of keyhole formation are established after synthetically considering the dynamic factors, such as plasma arc pressure, gravity and surface tension etc., which affect the keyhole formation in plasma-arc welding. On the basis of those models, the cybernetic equations describing the current density distribution and heat transfer of DSAW are relatively established. Coupling consequences of those equations can be attained with the numeric simulation technology. Furthermore, rules of heat transfer and performance of HAZ in double-sided arc welding are quantitatively analyzed. Meanwhile, as a comparison, the phenomenon of heat transfer in PAW is also simulated. Consequently, the principles of greatly deepening weldpool and improving HAZ performance are disclosed and the bases for designing and optimizing the welding process parameters are provided.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第5期499-504,共6页
Acta Metallurgica Sinica
基金
美国国家自然科学基金 DMI 9812981
关键词
双面电弧焊接
温度场
热影响区
数值模拟
double-sided arc welding (DSAW), temperature field, heat affect zone numeric simulation
