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Theses

Study of the forming of the cladded work-pieces by hot forging

Abstract : The thesis presented is dedicated to the forming of the weld cladded work pieces. The proposed idea is based on reversing the classical fabrication layout of simple cladded preforms by performing the hot forging process after the weld cladding. The expected benefits are structural refinement of fusion weld solidification by hot forging structure and the ease of automation of MIG cladding on simple preforms. Initially a methodology is setup for the MIG cladding process on simple shapes which is based on two approaches: the statistical experimental study of a single bead cladding and the determination of the optimum bead overlapping by using two overlapping models to setup the link between dilution rate, nominal energy of welding and metallurgical quality of the stainless steel cladding on mild steel substrate. In a second step, the focus is on the hot forging behavior of the cladded work piece. Keeping in view the following three aspects: the intrinsic forgeability of each material, the forgeability of the structure composed of the cladding and the substrate part near the interface and the ability to control the overall material distribution during the forming process. This work is the result of an initial feasibility study for reversing the classical manufacturing layout and clad a simple shape and get in shape by hot forging which are considered ideal for obtaining complex shapes. The analytical, numerical and experimental trials are carried out to evaluate the forgeability of bi-material. The aim is to assess the forgeability of the multi-material keeping in mind to what extent are we able to find conditions for implementation of the forming that allows us from a rough cladding to get a defect free part with the desired distribution of materials.
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Submitted on : Wednesday, February 15, 2012 - 10:03:20 AM
Last modification on : Friday, October 23, 2020 - 4:37:30 PM
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  • HAL Id : pastel-00670276, version 1

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Muhammad Rafiq. Study of the forming of the cladded work-pieces by hot forging. Materials. Arts et Métiers ParisTech, 2011. English. ⟨NNT : 2011ENAM0035⟩. ⟨pastel-00670276⟩

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