Friction welding of FC250 common grade cast iron was carried out to examine the weldability and temperature distribution near the weld interface during welding. The joint strength of both solid and pipe joints was evaluated by tensile tests. The highest tensile strengths in the solid joints and pipe joints were 317 MPa (79% joint efficiency) and 381 MPa (95% joint efficiency), respectively. A fine-grained interfacial layer of FC250 formed near the axial center at the weld interface in the solid joints, whereas there was no fine-grained interfacial layer in the pipe joints. The welding material temperature at the axial center was higher than that at the periphery in the solid joint. There was little difference in the temperature distribution between the solid joints and pipe joints.
In order to investigate the key parameter governing the fatigue strength of adhesively bonded CFRP pipe/steel rod joint, a series of rotating bending fatigue tests were carried out on the joints with different lap length and with different pipe thickness. And, the fatigue strength data were discussed on the basis of stress distributions in the adhesive layer determined by FEM analysis. The results indicated that the fatigue strength of this type of joint was mainly governed by the maximum tensile stress normal to the bond interface at the lap end.
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