埋弧焊电弧空腔行为及其影响

Arc cavern behavior and its influence of submerged arc welding

综述了埋弧焊电弧空腔行为及其影响。表明电弧空腔是由半熔化焊剂壁组成的、内部充满金属蒸气和焊剂分解物混合烟气的、顶部圆球形底部熔池的一个三维电弧空间。空腔内电弧形态属于连续、非活动型;在单丝埋弧焊中,渣壁过渡是熔滴的主导过渡形态。在空腔内熔滴和焊缝中有增氧现象发生,其中熔滴的增氧最大,电源极性和电流变化对增氧量有影响。熔滴反应区的渗硅增氧反应佐证了空腔内的增氧事实。电源极性和焊剂熔渣碱度可能使熔滴增氧、细化熔滴,但不至于改变熔滴的渣壁过渡形态。

The arc cavern behavior and its influence of submerged arc welding were reviewed. The results show that the arc cavern isa three-dimensional arc space with a top round and the bottom molten pool, consisting of a semi molten flux wall, and Internally filledwith metal vapor and flux decomposition mixture. The arc shape in the cavern should belong to the continuous and inactive type, andthe flux-wall guided transfer is the dominant transfer form in single wire submerged arc welding. The phenomenon of oxygen gainingoccurs in the droplet and weld metal inside the arc cavern, and the content of oxygen gaining in the droplet is maximum, the polarityof the power supply and current changes affect the oxygen gaining content. The reaction of silicon reduction and oxygen gaining in thedroplet reaction zone proves the fact of oxygen gaining in the cavern. The polarity of the power supply and the flux slag basicity maymake the droplet oxygenation and fining droplet but does not change the flux-wall guided transfer form of the droplet.