Performance study of high boron clad layer welded by PTA on hydraulic support piston rod surface

In this paper, plasma transferred arc welding (PTA)is used to prepare high boron clad layer on hydraulic support piston rod surface. The microstructural, component distribution, phase constitution, microhardness, wear resistance and corrosion resistance are analyzed. The results show that four high boron clad layers is formed well and no cracking, microstructure homogeneity are found. With the increase of the boron content, the microhardness of clad layer increases gradually with the maximum 440 HV₂₀, and wear resistance increases first, then decreases. In salt spray test, No.1 and No.2 clad layers don't have corrosion points after 480 hours, which shows the good corrosion resistance. Finally it is concluded that No.2 wire has high corrosion resistance which has well microhardness and wear resistance at the same time. It meets the demand of hydraulic support piston rod.