气体保护焊烟尘形成机理分析

发布时间：2018-02-22 09:17

本文关键词： 气体保护焊一次烟尘粒子二次烟尘粒子粒径分布烟尘形貌　出处：《焊接学报》2015年05期 　论文类型：期刊论文

【摘要】：以H08Mn2Si实芯焊丝的熔化极气体保护焊和SJ501药芯焊丝的CO2保护焊为对象,探讨了气体保护焊烟尘粒子的粒径分布特征和形成机理.采用准光弹性散射法测量烟尘粒径,并利用透射电镜(TEM)、能谱(EDS)对烟尘粒子的形貌、结构和化学成分进行了观察和分析.结果表明,两种工艺形成的烟尘一次粒子都呈球形,表面圆滑,直径一般小于200 nm,大多数烟尘粒子都是铁的氧化物.研究还发现,烟尘的二次粒子为链状或网状结构,由大量一次粒子聚结而成,与实芯焊丝的熔化极气体保护焊形成的烟尘相比,药芯焊丝CO2焊形成的烟尘化学成分更复杂,烟尘二次粒子更细小.
[Abstract]:Taking the gas shielded welding of H08Mn2Si solid core wire and the CO2 shielded welding of SJ501 flux-cored wire as objects, the particle size distribution and formation mechanism of smoke particles in gas shielded welding are discussed. The particle size of smoke is measured by quasi-light elastic scattering method. The morphology, structure and chemical composition of soot particles were observed and analyzed by means of transmission electron microscope (TEM) and energy dispersive spectroscopy (EDS). The results show that the primary particles formed by the two processes are spherical and smooth. The diameters are generally less than 200 nm, and most of the dust particles are iron oxides. It has also been found that the secondary particles of soot are chain or reticular structures, formed by the aggregation of a large number of primary particles. Compared with the smoke produced by gas shielded welding of solid cored wire, the chemical composition and secondary particle size of flux-cored wire CO2 welding are more complex and finer than those of flux-cored wire.
【作者单位】：天津大学材料科学与工程学院;中国医学科学院放射医学研究所;北洋国家精馏技术工程发展有限公司;
【基金】：天津市应用基础及前沿技术研究计划项目(07JCYBJC-04400,11JCYBJC06100)
【分类号】：TG444.72

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