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报道了一种新颖的热剂焊接方法,采用该种热剂焊接方法可以在无电条件下,不借助任何辅助设备,便可十分方便的进行手工焊接作业。通过分别添加不同含量的微硅粉和硅灰石作为稀释剂对热剂反应进行调控,获得了不同燃烧速率的热剂焊条;对在不同燃烧速率下焊接所得的焊接接头进行了显微组织分析。结果表明:在高的燃烧速率下焊接时,焊缝组织中易出现缩松和夹渣缺陷;随着燃烧速率的降低,焊缝显微组织中的缩松和夹渣缺陷逐渐消除;当燃烧速率进一步降低时,焊缝组织中开始出现大量气孔缺陷。分析表明:这种显微组织的演变与不同燃烧速率下焊接熔池所经历的升温过程有关。
A novel thermal agent welding method is reported. With this kind of thermal agent welding method, the manual welding operation can be conveniently carried out without any auxiliary equipment without electricity. By separately adding different content of micro-silica fume and wollastonite as a diluent to adjust the thermal agent reaction, obtained at different burn rate of hot agent electrode; at different burning rates welded welded joints were microstructure analysis . The results show that shrinkage and slag inclusion defects tend to occur in the weld seam during welding at high burning rate. As the burning rate decreases, the shrinkage and slag inclusion defects in the weld microstructure gradually disappear. When the burning When the rate is further reduced, a large number of stomatal defects begin to appear in the weld seam. The analysis shows that the evolution of this microstructure is related to the heating process experienced by the weld puddle at different burn rates.