Print Email Facebook Twitter Analysis of the bonding strength and microstructure of AA6082 extrusion weld seams formed during physical simulation Title Analysis of the bonding strength and microstructure of AA6082 extrusion weld seams formed during physical simulation Author Bai, Sheng Wen (Tsinghua University; State Key Lab of Tribology) Fang, Gang (Tsinghua University; State Key Lab of Tribology) Zhou, J. (TU Delft Biomaterials & Tissue Biomechanics) Date 2017 Abstract The research was aimed to determine the effects of extrusion process condition on the weld seam quality of the aluminum alloy AA6082 by using a novel physical simulation method. A weld seam between two bars was formed under hydrostatic pressure in a specially designed die setup to simulate the longitudinal weld seam formation during extrusion through porthole die. With this die setup, extrusion process variables, i.e., temperature, extrusion speed and strain, could be varied so that their individual effects on weld seam quality could be discriminated. With the help of finite element (FE) simulation, the distributions of strains, strain rates and hydrostatic pressures inside the welding chamber were quantified. Tension tests were performed to evaluate the bonding strengths of solid-state welded samples. It was found that the amount of deformation imposed inside the welding chamber had a dominant effect on the bonding strength. A high deformation temperature and a high extrusion speed enhanced the bonding strength. The microstructures across the weld zone were examined by using a polarized light microscope and electron back-scatter diffraction (EBSD). The microstructure evolutions inside and around the welding zone were found to be influenced by the deformation condition. High temperature, high extrusion speed and large deformation promoted the occurrence of local dynamic recrystallization, leading to reduced mean grain sizes inside the welding zone, corresponding to an enhanced strength at the weld seam. Subject Aluminum alloyExtrusionMicrostructureRecrystallizationSolid-state weldingWeld seam To reference this document use: http://resolver.tudelft.nl/uuid:436a9d60-2cb1-4d2e-a6d1-6b592fcb5faf DOI https://doi.org/10.1016/j.jmatprotec.2017.07.012 Embargo date 2019-07-18 ISSN 0924-0136 Source Journal of Materials Processing Technology, 250, 109-120 Part of collection Institutional Repository Document type journal article Rights © 2017 Sheng Wen Bai, Gang Fang, J. Zhou Files PDF Article_on_6082_extrusion ... rsion_.pdf 3.33 MB Close viewer /islandora/object/uuid:436a9d60-2cb1-4d2e-a6d1-6b592fcb5faf/datastream/OBJ/view