Droplet transfer behavior of the stainless steel coated electrode with double-layer coating

In this paper, the droplet transfer behavior of the stainless steel coated electrode with double layer coating is researched by means of those experimental methods, such as high speed camera, collecting droplet in water, surfacing on the steel plate et al. The results show that the droplet transfer indexes of coated electrode are mainly controlled by the size of droplet, which affects the transfer behavior of droplet. The distribution characteristic of the droplet size of the electrode affects the numerical relationship among droplet transfer indexes. The metallurgical process of the coated electrode with double layer coating is carried out continuously in different zones. The main reason for the coated electrode with double layer coating gaining excellent usability quality is that the droplets realize the 'quasi flux wall guided transfer pattern'.

Study of porosity tendency in the Cr-Ni austenitic weld based on inclusion’s characteristic in the droplet

The effect of nonmetallic inclusions in the droplet of the stainless steel covered electrode on the porosity was researched.The result shows that the nonmetallic inclusions in the droplet are spherical,their composition is different from the one of slag and the inclusions have the character of “inner formation”.When the ratio of rutile to ilmenite in the coated material is increased, the droplet becomes coarse, the content of nonmetallic inclusion in the droplet decreases,and the porosity sensitivity in the weld metal also decreases.When the ratio of fledspar to ilmenite in the coated material is increased, the droplet becomes fine,the content of nonmetallic inclusion in the droplet increases, and the porosity sensitivity in the weld metal increases. When the ratio of Fe_2O_3 to ilmenite in the coated material is increased, the droplet becomes fine, the content of nonmetallic inclusion decreases, while the porosity sensitivity does not reduce.

不锈钢焊条熔滴过渡及其影响因素研究

采用水中收集熔滴、平板堆焊、高速摄影等试验方法 ,研究了典型不锈钢焊条熔滴过渡特性及其影响因素。结果表明 ,熔滴过渡指数为优化值时 ,焊条熔滴呈渣壁过渡形态 ,焊条的综合工艺性最佳 ;药皮中的SiO2 细化熔滴作用最强 ;增大药皮厚度和焊接电流均使熔滴细化 ,但受焊条工艺性制约 ;熔滴反应区的渗Si反应亦有利于细化熔滴 ,但受焊缝最高含Si量的限制 ;焊接熔渣的碱度、组成物及含量对熔滴过渡特性亦有一定的影响 ;提出了“焊条熔滴本质质量比”和“焊条允许增Si量”概念。

不锈钢焊条熔滴过渡形态的控制

采用水中收集熔滴、平板堆焊、高速摄影等试验方法，对不锈钢焊条熔滴过渡形态及其控制进行研究。结果表明，细熔滴渣壁过渡时，焊条的综合工艺性好，但气孔倾向大。提出抗气孔与优良工艺兼备的“准渣壁过渡”概念及其形成条件。采用及双层药皮既可以实现理想的渣壁过渡，又能发挥强烈的冶金去氢作用。

焊接电流对不锈钢焊条熔滴过渡及熔滴中夹杂物的影响

采用水中收集熔滴、光学显微分析、电子扫描能谱分析、计算机图象分析及平板堆焊等试验方法 ,研究了焊接电流对E30 8- 16不锈钢焊条熔滴中夹杂物的影响 .结果表明 ,焊接电流增大时 ,焊条的熔滴质量比和熔滴的平均质量减小 ,熔滴的过渡频率增高 ,熔滴中非金属夹杂物含量增大 ,焊缝中的气孔率与熔滴中夹杂物含量之间不存在严格的规律性对应关系 ;熔滴中非金属夹杂物是熔滴区化学反应的产物 ,属“内生”性质 .

不锈钢焊条熔滴过渡形态与交流稳弧性的关系

采用水中收集熔滴、平板堆焊、高速摄影等试验方法，研究了不锈钢焊条熔滴过渡形态与交流稳弧性的关系。结果表明：细熔滴过渡时交流稳弧性好，电极斑点面积增大是改善交流稳弧性的主要原因；促使熔滴细化的药皮组成物、适当的药皮厚度、合理的焊条烘干温度和合适的焊接电流，对改善交流稳弧性都具有重要作用。

钛型不锈钢焊条渣壁过渡形成条件的探讨

渣壁过渡是焊条金属熔滴理想的过渡形态。本文探讨了形成渣壁过渡的两个基本条件,并提出了钛型不锈钢焊条药皮成分,焊条外径影响熔滴过渡形态的关系图,以判断此类不锈钢焊条熔滴过渡形态,并指导其配方设计。