Abstract

Plastic has been used in the automobile and aircraft industries to achieve effective weight reduction. Direct joining technique of plastics to steel is focused so as to use plastics in a wide range of applications. In this study, plastics were joined to steel via friction lap joining (FLJ). Experimental materials were 6nylon and polyethylene (150mm×75mm×3mm each), which were selected as plastics, and plain carbon steel (SPCC, 150mm×75mm×2mm). SPCC was fixed on a plastic plate and frictionized using a WC-Co tool (15mm diameter). Different joining speeds, in the range 200–1000mm·min-1 at constant tool rotation speed, were selected. The FLJ technique enabled the direct joining of 6nylon to SPCC. However, effective joining of polyethylene to SPCC could not be accomplished. In the case of 6nylon/SPCC joints, the maximum tensile shear strength was obtained with a joining speed of 600mm·min-1, and fracture in the tensile shear test occurred in the 6nylon matrix. Favorable adhesion at the 6nylon/SPCC interface was observed by cross-sectional microstructure analysis of the joint with a joining speed of 600mm·min-1.

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