开发参数窗口和优化工艺参数,以预测磁控气体钨极氩弧焊的焊缝轮廓

Paramjeet Shakya, Kulwant Singh, H. Arya
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摘要

我们提出了一种新方法,通过采用外部磁场来控制电弧形状,从而产生所需的焊接轮廓。由专门设计的电磁铁产生的同轴磁场叠加在焊接电弧上。研究发现,与传统的气体钨极氩弧焊相比,0-0-S-N 配置能提供更强的穿透力。针对所选配置开发了一个参数窗口,以获得所需的焊珠几何形状。实验采用了响应曲面法技术开发的设计矩阵所建议的工艺参数。根据穿透力和焊缝宽度的实验数据建立了数学模型。所建立的模型对穿透力的置信度高达 99.72%,对珠宽的置信度高达 99.98%。过程参数的影响以图表的方式呈现,以便更好地理解。磁控 GTAW 工艺的穿透力为 3.92 毫米,比传统 GTAW 工艺高出 30%。焊珠宽度最初会增加到一定限度,然后随着激励电流的增加而减小。此外,还对优化参数进行了实验,以验证模型。由于对熔池进行了磁力搅拌,因此获得了细化晶粒,这对于改善焊缝的机械性能是非常理想的。平均晶粒大小从 42.55 微米减小到 31.03 微米。磁控电弧改善了微观结构,含有更多的针状铁素体。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Development of parametric window and optimization of process parameters to predict bead profile in magnetically controlled gas tungsten arc welding
A novel methodology has been proposed to tame the arc shape by adopting an external magnetic field, resulting weld profile as required. The co-axial magnetic field developed by specially designed electromagnets is superimposed on the welding arc. It was found that 0-0-S-N configuration provided more penetration than conventional gas tungsten arc welding. A parametric window has been developed for the selected configuration to obtain the desired bead geometry. The experiments were performed using process parameters as suggested by the design matrix, developed using response surface method technique. Mathematical models were evolved from experimental data for penetration and bead width. The evolved model for penetration is adequate up to 99.72% confidence level and for bead width is 99.98% confidence level. The effects of process parameters have been presented in a graphical manner for better understanding. The penetration achieved with the magnetically controlled GTAW process is 3.92 mm, which is 30% more than that achieved with conventional GTAW. The bead width increases initially, up to a certain limit, and then reduces with an increase in excitation current. Further, the experiments have been conducted on the optimized parameters for the validation of models. The refined grains were obtained due to magnetic stirring of the molten pool, which is desirable for improvement in mechanical properties of welds. The average grain size was reduced from 42.55 to 31.03 µm. The improved microstructure containing more amount of acicular ferrite was obtained with magnetically controlled arc.
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