Q235钢表面CMT堆焊310不锈钢的组织与性能
Microstructures and properties of 310 stainless steel layer deposited on Q235 steel by CMT surfacing
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摘要: 采用自动CMT (Cold metal transfer) 焊工艺，在Q235钢板堆焊了H12Cr26Ni21Si不锈钢，焊接电流为108 A，焊接电压为15.8 V，摆动宽度为12 mm，摆动速度为23 mm/s，焊接速度为2 mm/s，堆焊搭接量为7 mm，获得了成型美观、致密无缺陷的不锈钢堆焊层。对堆焊层的显微组织、化学成分进行了分析，测试了堆焊层的显微硬度及与基体结合强度。结果表明，堆焊层组织为奥氏体树枝晶和等轴晶；Ni,Cr,Fe是组成堆焊层的主要元素；堆焊层硬度高于基体；堆焊层与基体的结合界面的抗剪切强度大于405 MPa。Abstract: H12Cr26Ni21Si stainless steel surfacing layer was prepared on Q235 steel plate with automatic cold metal transfer (CMT) welding. The parameters were welding current of 108 A, arc voltage of 15.8 V, swing wide of 12 mm，swing speed of 23 mm/s，welding speed of 2 mm/s and overlap quantity of 7 mm. A sound and defect-free surfacing layer was obtained. The microstructures and chemical composition of the surfacing layer were analyzed. The hardness and bonding strength of the interface were tested. The results show that the microstructures of the surfacing layer consist of dendritic and equiaxed austenite and the essential elements in the surfacing layer are Ni, Cr and Fe. The hardness of the surfacing layer is higher than that of the matrix and the bonding strength of the interface is greater than 405 MPa.
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Keywords:
- surfacing /
- stainless steel /
- microstructure /
- properties
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