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采用福尼斯自动堆焊机及滚轮架设备、脉冲熔化极气体保护焊方法对规格为准219.1mm×(14.3+3)mm、材质为X65+316L的复合管管端内壁堆焊3mm厚、50mm长的Inconel625耐蚀合金层,堆焊后对堆焊层进行化学分析、金相组织观察和性能测试。结果表明,在堆焊层与基层界面处化学元素扩散不严重,未影响堆焊层的耐蚀性能;堆焊层的显微组织为树枝状奥氏体;堆焊层与基层形成致密的冶金结合,界面处没有出现气孔、裂纹及熔合不良等冶金缺陷;堆焊层的硬度高于基层;堆焊后界面结合强度平均为415MPa。
Using Forni automatic welding machine and roller frame equipment, pulse melting gas shielding welding method to the standard 219.1mm × (14.3 +3) mm, the material is X65 +316 L composite pipe end wall surfacing 3mm thick, 50mm Long Inconel625 corrosion-resistant alloy layer, surfacing after the weld layer chemical analysis, microstructure observation and performance testing. The results show that the diffusion of chemical elements is not serious at the interface between the surfacing layer and the base layer, and the corrosion resistance of the surfacing layer is not affected. The microstructure of the surfacing layer is dendritic austenite. The overlay layer forms a dense metallurgy with the base layer In combination, no metallurgical defects such as pores, cracks and poor fusion appear on the interface. The hardness of the overlay is higher than that of the base. The average bonding strength of the interface after overlay welding is 415MPa.