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赵明, 杜丹丹, 罗德通. 多参数对GTAW焊接温度场影响分析[J]. 焊接学报, 2013, (3): 20-24.
引用本文: 赵明, 杜丹丹, 罗德通. 多参数对GTAW焊接温度场影响分析[J]. 焊接学报, 2013, (3): 20-24.
ZHAO Ming, DU Dandan, LUO Detong. Effects of welding parameters on temperature field in GTAW[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2013, (3): 20-24.
Citation: ZHAO Ming, DU Dandan, LUO Detong. Effects of welding parameters on temperature field in GTAW[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2013, (3): 20-24.

多参数对GTAW焊接温度场影响分析

Effects of welding parameters on temperature field in GTAW

  • 摘要: 运用ANSYS软件对钨极惰性气体保护焊接(GTAW)热过程进行数值分析.连续施焊20 s和自然冷却20 s的等温面瞬态演变结果表明,施焊开始后经过5 s工件全部熔透,但冷却开始后液态熔池区域在不到1 s内就全部消失;施焊阶段高温区域随热源同步移动,冷却开始后高温区域会逐渐后移并终冷至室温.工件上一系列等距离点的焊接热循环曲线表明,稳态时焊接热循环曲线升温阶段变化趋势相同,但由于熔融金属从液态转变为固态释放出相变潜热,使得冷却阶段变化趋势存在明显差别:越远离收弧位置的点,温度衰减越缓慢;越靠近收弧位置的点,衰减越快.并通过分析焊接电流、焊接速度、热流集中参数对焊接热过程的影响规律,获得了优化的焊接工艺参数.

     

    Abstract: Numerical analysis of heat transfer in gas tungsten arc welding (GTAW) process was conducted with ANSYS software. The calculated results of transient evolution of isotherms during continuous welding for 20 s and cooling for 20 s show that the workpiece was completely penetrated at 5 s after the arc was struck,however,the molten pool totally disappeared within 1 s after the arc moved away. During the welding process, the high-temperature region moved simultaneously with the arc. When the arc moved away,the cooling stage began,the zone with high temperature gradually moved backward (relative to the welding direction) and cooled to ambient temperature. The predicted thermal cycles at different points with the same intervals on top surface along the welding direction displayed that the temperature rising curves have the same trend in quasi-steady state, while clear differences existed between the temperature decreasing curves because the latent heat was released when the molten metal solidified. The temperature decreased faster at points closer to the weld crater. The influences of welding current,welding speed and concentration parameter on the heat transfer were analyzed, and then these parameters were optimized.

     

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