药芯焊丝TIG焊电弧特性的光谱分析

发布时间：2018-06-07 20:50

本文选题：药芯焊丝 + TIG焊　；参考：《光谱学与光谱分析》2017年07期

【摘要】：利用光谱诊断方法结合高速摄像研究所提出的药芯焊丝的填丝TIG焊接新工艺的电弧特性,借助高速摄像研究药芯焊丝TIG焊的熔滴过渡方式;通过对焊接电弧进行光谱采集点扫描,对采集的谱线进行元素标定,以药粉中活性元素K和Na作为追踪目标,统计得到电弧中药粉成分的分布范围;并利用Boltzmann图法计算TIG焊电弧的温度场分布,分析了熔滴过渡方式对电弧温度场分布的影响。研究结果表明,通过调整丝极间距,得到药芯焊丝TIG焊的三种典型的熔滴过渡方式:滴状过渡(2mm)、渣柱过渡(5mm)和搭桥过渡(7mm)。药粉中的活性元素K和Na等集中分布在熔池上方的电弧空间,且其分布受丝极间距的影响,丝极间距越小其分布越靠近钨极,容易造成对钨极的污染。不填丝TIG焊的电弧温度分布呈钟罩形,等温线关于钨极轴线近似对称分布;与不填丝TIG焊相比,药芯焊丝TIG焊的电弧温度场受熔滴过渡的影响发生了不同程度的扭曲,滴状过渡的电弧温度场扭曲严重,焊接过程中飞溅较大;相比于滴状过渡,渣柱过渡和搭桥过渡的电弧温度场扭曲程度较小且焊接过程稳定,适合该TIG焊方法的使用。
[Abstract]:The method of spectrum diagnosis is used to study the droplet transfer mode of flux-cored wire TIG welding with the help of high speed photography combined with the arc characteristics of the new welding process of flux-cored wire TIG welding proposed by the Institute of High-Speed Photography. By scanning the spectrum of welding arc, calibrating the spectrum line, taking the active elements K and Na in the powder as the tracking target, the distribution range of the composition of the traditional Chinese medicine powder of the arc is statistically obtained. The temperature field distribution of TIG welding arc is calculated by Boltzmann diagram method, and the effect of droplet transfer mode on arc temperature field distribution is analyzed. The results show that by adjusting the electrode spacing, three typical droplet transfer modes of flux-cored wire TIG welding are obtained: droplet transfer (2mm), slag column transition (5mm) and bypass transfer (7mm). The active elements K and Na in the powder are concentrated in the arc space above the molten pool, and their distribution is affected by the distance of wire electrode. The smaller the distance of wire electrode is, the closer the distribution is to tungsten electrode, which will easily cause the pollution of tungsten electrode. The arc temperature distribution of TIG welding without filler wire is bell-shaped, and the isotherm is approximately symmetrical about the axis of tungsten electrode. Compared with TIG welding without filler wire, the arc temperature field of flux-cored TIG welding is distorted to some extent by the droplet transfer. Compared with the droplet transition, the arc temperature field of droplet transition and brace transition is smaller and the welding process is stable, which is suitable for the TIG welding method.
【作者单位】：天津大学材料科学与工程学院;天津大学天津市现代连接技术重点实验室;
【基金】：国家自然科学基金项目(51175374) 天津市自然科学基金项目(16JCZDJC38700) 先进焊接与连接国家重点实验室项目(AWJZ15-03)资助
【分类号】：TG444.74

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