Effect of ultrasonic rolling on the surface properties of welded joints of 5083 aluminum alloy
The surface ultrasonic rolling treatment of 5083 aluminum alloy MIG welded joints was carried out.The surface microstructure,surface morphology,surface roughness,hardness and residual stress of the joints before and after ultrasonic rolling treatment were compared and analyzed,and the corrosion resistance of the joints was tested.The results showed that after surface ultrasonic rolling treatment,the surface metal of the joint had obvious plastic flow,and the surface grains were refined to a certain extent.The surface roughness of the joint was obviously reduced,and the heat-affected zone was the most obvious.The Ra value was reduced from 2.93 µm to 0.155 μm,and the surface becomed smooth and flat.The surface hardness of the joint increased,and the weld zone increased most obviously,from 97.92HV to 124.67HV.After ultrasonic rolling treatment,the residual tensile stress near the weld of the joint was completely transformed into the residual compressive stress of about-300 MPa.The corrosion resistance test results showed that the surface corrosion resistance of the joint after ultrasonic rolling treatment was improved to a certain extent.
5083 aluminium alloysurface ultrasonic rolling treatmentsurface roughnessresidual stresscorrosion resistance
NETL
NSTL
万方数据
