Friction welding of similar and dissimilar materials: PMMA and PVC

The effects of spin friction pressure and time on the friction welding betw een parts of the same material and different materials are discussed. The h eat-affected zone is divided into three regions: the plasticized region (Zp l), the partly plasticized region (Zpd), and the undeformed region (Zud). T he tensile fracture morphology has three sections: the non-plasticized cent ral section (Fud), the plasticized peripheral section (Fpl), and the partly plasticized section between Fud and Fpl (Fpd). Friction pressure (spinning timing): 0.784 Mpa (6 seconds), 0.981 MPa (8 seconds and 10 seconds) in PM MA-PMMA welding, 0.588 Mpa (10 seconds) in PVC-PVC welding, and 15.7 MPa (1 5 seconds) in PMMA-PVC welding attains better bonding strength, because the se parts have larger Fpd and Fpl regions, which have no Fud in the central part.