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Polycarbonate (PC)-poly (methyl methacrylate) (PMMA) joints were prepared by injection welding of inserting their blends.The shear strength of the interface was measured in relation to the blend ratio of inserted PC/PMMA.The highest strength of about 23.7 MPa was shown in the joint specimen inserting PC/PMMA with the blend ratio of 75:25 (PC:PMMA).