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The Effects of Weld Geometry and Glass-Fiber Orientation on the Mechanical Performance of Joints – Part I: Weld Design Issues

The mechanical performance of injection molded glass-fiber reinforced [thermo]-plastic components is anisotropic and depends on the fiber orientation and distribution. The purpose of this comprehensive analysis is to show the relationship between short-fiber orientation at the prewelded bead and wall areas, and the mechanical performance of welded butt-joints that have various geometry and thickness, namely ‘‘straight’’ and ‘‘T-type’’ welds. Findings on the mechanical performance of these two different types of butt-joints by the design and geometry butt-joints will help designers and technologists with material selection, welding processing, and design optimization. In a subsequent paper (Part II)1, we related these findings to the kinetics of glass-fiber reorientation and micro-structural changes and how they influence part and weld design.