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Butt joint

About: Butt joint is a(n) research topic. Over the lifetime, 6840 publication(s) have been published within this topic receiving 36822 citation(s). more

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Journal ArticleDOI
Patrick Ulysse1Institutions (1)
Abstract: This paper presents an attempt to model the stir-welding process using three-dimensional visco-plastic modeling. The scope of the project is focused on butt joints for aluminum thick plates. Parametric studies have been conducted to determine the effect of tool speeds on plate temperatures and to validate the model predictions with available measurements. In addition, forces acting on the tool have been computed for various welding and rotational speeds. It is found that pin forces increase with increasing welding speeds, but the opposite effect is observed for increasing rotational speeds. Numerical models such as the one presented here will be useful in designing welding tools which will yield desired thermal gradients and avoid tool breakage. more

391 citations

Journal Article
TL;DR: Three-dimensional, non-linear finite element models were created to compare the 2 connection principles under equal conditions and give insight into the mechanics involved in each type of connection and are compared to actual findings with the testing machine. more

Abstract: This paper presents aa comparison between the 8-degree Morse Taper and the butt joint aa connections between an implant and an abutment. Three-dimensional, non-linear finite element models were created to compare the 2 connection principles under equal conditions. The loading configuration was thereby modeled according to a test setup actually used for the dynamic long-term testing of dental implants as required for regulatory purposes. The results give insight into the mechanics involved in each type of connection and are compared to actual findings with the testing machine. The comparison indicates the superior mechanics of conical abutment connections and helps to explain their significantly better long-term stability in the clinical application. more

346 citations

Journal ArticleDOI
01 Feb 2006-Acta Materialia
Abstract: The properties of a workpiece joined by friction stir welding (FSW) are directly related to the material flow around the tool. In the present work, the material flow is investigated by traditional metallography as well as X-ray and computer tomography (CT). By introducing a thin copper strip in the workpiece and welding through it, thus, acting as a marker material, detailed information about the flow field is gathered. The two- and three-dimensional CT images are used in parallel with micrographs for visualization of the flow field. Two procedures for estimating the average velocities for material flowing through the shear layer are presented. The procedures depend on the configuration of marker material relative to the welding direction, i.e. longitudinal and transverse. As such, the present work constitutes the first attempt in the literature to estimate flow velocities in FSW based on thorough experimental investigations. more

290 citations

Journal ArticleDOI
Abstract: A three-dimensional finite element model has been developed to simulate the laser welding process and predict laser welded panel distortions. The finite element calculations were performed using the SYSWELD FE code, which takes into account thermal, metallurgical and mechanical aspects. The simulation of the laser welding process was performed using a nonlinear heat transfer analysis, based on a keyhole formation model, and a coupled transient thermo-mechanical analysis. The analysis takes into account metallurgical transformations using the temperature dependent material properties and the continuous cooling transformation (CCT) diagram. The geometry examined was a butt-joint specimen that consisted of thick AH36 shipbuilding steel plates, using different welding parameters. Experimental testing was carried out to measure the distortions of the welded specimens and verify the FE approach. The FE results are in good agreement with experimental measurements. more

279 citations

Journal ArticleDOI
P. Xue1, Ni Dingrui1, Duoming Wang1, B.L. Xiao1  +1 moreInstitutions (1)
Abstract: Butt joints of 1060 aluminum alloy and commercially pure copper were produced by friction stir welding (FSW) and the effect of welding parameters on surface morphology, interface microstructure and mechanical properties was investigated. The experimental results revealed that sound defect-free joints could be obtained under larger pin offsets when the hard Cu plate was fixed at the advancing side. Good tensile properties were achieved at higher rotation rates and proper pin offsets of 2 and 2.5 mm; further, the joint produced at 600 rpm with a pin offset of 2 mm could be bended to 180 degrees without fracture. The mechanical properties of the FSW Al-Cu joints were related closely to the interface microstructure between the Al matrix and Cu bulk. A thin, uniform and continuous intermetallic compound (IMC) layer at the Al-Cu butted interface was necessary for achieving sound FSW Al-Cu joints. Stacking layered structure developed at the Al-Cu interface under higher rotation rates, and crack initiated easily in this case, resulting in the poor mechanical properties. (C) 2011 Elsevier B.V. All rights reserved. more

267 citations

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Topic's top 5 most impactful authors

Livan Fratini

21 papers, 715 citations

Toshiyuki Sawa

21 papers, 222 citations

Gianluca Buffa

13 papers, 610 citations

Azman Ismail

12 papers, 17 citations

Pierpaolo Carlone

7 papers, 124 citations