Due to the processing history and mold design in injection molding hot interfaces, known as weld lines, or cold interfaces are formed. A possible reason for the development of weld lines is the division of the melt due to the presence of flow obstacles or more than one gate to create complex parts. Cold interfaces are formed by over molding of precooled surfaces. The characteristic structure orientation and morphology development that depends on the thermodynamic behavior at the interfaces leads to optical and/or mechanical weaknesses. The poster gives an overview of the process-induced morphology of injection molded PA 6.6 with hot and cold interfaces. It is shown how the thermal processing history affects the morphology, especially in the skin-core region of the samples. The relation between crystalline structure and mechanical properties is shown. A better understanding of these relationships is used to reduce the process induced weaknesses through process optimization and to make new application fields possible.