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采用反极性弱等离子弧堆焊方法分别在无磁场和外加横向交流磁场条件下将铝青铜粉末堆焊到锅炉用钢20g母材上。通过硬度试验及金相显微方法,分析了堆焊层的力学性能及组织形貌。结果表明,无磁场作用下,堆焊层的硬度随着堆焊电流的增加而呈“小→大→小→大”变化,当堆焊电流为100A时,硬度值最大,为214.7HV;当堆焊电流为110A时,硬度值最小,为163.7HV。外加磁场作用下,堆焊电流取100 A,堆焊层的硬度在磁场电流为0.5A时达到最大,为245.9HV。堆焊电流为100A时,堆焊层组织为致密的α-Cu和网状结构的(α+γ2),此时为较好的组织结构。
The reverse polarity weak plasma arc welding method was used to deposit aluminum bronze powder on 20g base metal of boiler steel without magnetic field and applied transverse AC magnetic field respectively. The mechanical properties and microstructure of surfacing layer were analyzed by hardness test and metallographic microscopy. The results show that under the action of no magnetic field, the hardness of surfacing layer changes from “small to large to small to large” with the increase of welding current. When the welding current is 100A, the hardness is the highest, which is 214.7 HV When the welding current is 110A, the hardness value is the smallest, 163.7HV. Under the action of external magnetic field, the welding current is taken as 100 A, and the hardness of the overlay reaches the maximum at a magnetic field current of 0.5 A, which is 245.9 HV. When the welding current is 100A, the overlay structure is dense α-Cu and (α + γ2) of the network structure, and the structure is better at this time.