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采用反极性等离子弧堆焊方法分别在不同堆焊电流下将铝青铜粉末堆焊到锅炉用钢20g母材上。通过硬度试验、金属间磨损试验和金相显微方法,研究堆焊电流对堆焊层组织和性能的影响。结果表明,随着堆焊电流加大,铝青铜堆焊层组织由层片结构逐渐过渡到多边形结构,在110 A时,堆焊层的组织最细。堆焊电流为120 A时,铝青铜堆焊层的硬度最高;堆焊电流为110~120 A时铝青铜堆焊层耐磨性能最高。
Using reverse polarity plasma arc welding method, respectively, under different welding current aluminum bronze powder surfacing to the boiler steel 20g base material. The effects of welding current on the microstructure and properties of overlay were studied by hardness test, intermetal wear test and metallographic microscopy. The results show that with the increase of welding current, the structure of aluminum bronze welding layer gradually transitions from the lamellar structure to the polygonal structure. At 110 A, the microstructure of the welding layer is the smallest. When the welding current is 120 A, the hardness of the aluminum bronze surfacing layer is the highest; the wear resistance of the aluminum bronze surfacing layer is the highest when the surfacing current is 110 ~ 120 A.