• The present manuscript explores the scope of metal forming operations into a state of art joining procedure. • ECAP works on the principle of severe plastic deformation but still limited to laboratory tests. • Y-shape die channels overcome the limitation of punch load required in extrusion and ECAP methods. • Increase in coefficient of friction softens the polymer while higher punch load utilized for diffusion. In this study, a new technique for joining two PA-6 (polyamide) polymers is presented. The method employed to investigate the joining behaviour of plastically deformed polymers by the extrusion. The focus is on extrusion and equal channel angular pressing parameters such as punch load, joint structure, dynamic mechanical analysis, and X-ray diffraction of the joint polymer. The proposed Y-shape die channel is reliable to join two similar natures of polymers without using any additive materials, and hence product over-weighing can be avoided. Due to two similar PA-6 polymer rods, their welding compatibility is so high. Hence, polymer surface get fused when pressed at defined temperature and pressure through a constant die channel. From the results, it is found that the equal channel angular pressing results inhomogeneous plastic deformation as compared to the extrusion. The inhomogeneous flow of particles is only inside the extrusion channel. As the working temperature reaches 2/3rd of the polymer melting point, the required punch load is become lower than cold extrusion. The required punch load is well validated with analytical punch load. In the dynamic mechanical analysis, it is found that the storage modulus of the joint structure is comparatively higher than the base polymer. The crystallization of joint polymer is also observed by X-ray diffraction. At the end of the test, good quality of joint is formed and it is found that the Y-shape channel is an efficient die design to obtain deformation based joint structure.