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Article
Publication date: 6 November 2017

Ting Yuan, Min-da Zhang, Jia-hui Ni, Ya-xuan Chen and Fei Geng

The purpose of this paper is to compare corrosion behavior of a modified multilayer material with Cu before and after brazing process.

Abstract

Purpose

The purpose of this paper is to compare corrosion behavior of a modified multilayer material with Cu before and after brazing process.

Design/methodology/approach

Sea water acidified accelerated tests (SWAATs), potentiodynamic polarization tests and scanning electron microscopy were used to study the corrosion behavior and macro/micro structures. Results indicate that the corrosion mechanisms of the sheets before and after brazing process are completely different.

Findings

The un-brazed material is uniform corrosion, while the brazed material has a high sensitivity to localized corrosion and loses cathodic protection to the core. It is found that brazing process causes copper transition from the core alloy into eutectic phases in the cladding, leading to higher Ecorr and different potential distribution compared with those of un-brazed materials.

Originality/value

For the modified multilayer material after brazing, there are two stages of corrosion. First, corrosion attack takes place along eutectic phases in the cladding material, and then core alloy dissolves by forming a galvanic couple with the nobler residual cladding.

Details

Anti-Corrosion Methods and Materials, vol. 64 no. 6
Type: Research Article
ISSN: 0003-5599

Keywords

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Article
Publication date: 6 November 2017

Hyung Goun Joo, Kang Yong Lee, Guo Ming Luo and Da Quan Zhang

The purpose of this paper is to investigate the combined erosion and corrosion behavior of WC-Ni vacuum brazed coating.

Abstract

Purpose

The purpose of this paper is to investigate the combined erosion and corrosion behavior of WC-Ni vacuum brazed coating.

Design/methodology/approach

Al2O3 particles and 10 wt% NaCl solution are used to evaluate erosion and corrosion resistance of WC-Ni vacuum brazed coating. Combined test of erosion and corrosion is also conducted. The microstructure of each specimen is characterized by the scanning electron microscopy. The chemical composition was determined by energy-dispersive X-ray spectroscopy.

Findings

WC-Ni vacuum brazed coating layer is effective protective coating under combined erosion and corrosion environment. The weight loss of coating layer is more reduced as the cumulative test time.

Originality/value

WC-Ni vacuum brazed coatings are investigated to check characteristic of the combined erosion and corrosion environment. WC-Ni vacuum brazed coatings are kind of diffusion coating that attract attention because of the resistance of superb impact and corrosion in comparison with other coatings. Some previous researches reported the properties of vacuum brazed WC material. Erosion and corrosion behaviors of WC-Ni vacuum brazed coatings were studied in our previous research, respectively. Hence, in this research, the principal objective is to examine the combined erosion and corrosion behavior of WC-Ni vacuum brazed coating.

Details

Anti-Corrosion Methods and Materials, vol. 64 no. 6
Type: Research Article
ISSN: 0003-5599

Keywords

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Article
Publication date: 1 June 1999

B.G. Bryden and I.R. Pashby

This paper outlines a method of sequentially joining steel laminations together using a high strength brazed joint to produce laminated tools. Individual joints were…

Abstract

This paper outlines a method of sequentially joining steel laminations together using a high strength brazed joint to produce laminated tools. Individual joints were produced by using a heated platen rather than a furnace. Lap shear test samples were used to evaluate the tensile strengths of bonded laminates. Two laminate gauges were tested, 0.8mm and 1.6mm. Ranging trials were undertaken to determine optimum time to produce the joint. Constants for the trials were platen temperature, laminate material, braze material, joint area and joining pressure. At optimum conditions, that is the least time taken for highest tensile strength, the 0.8mm laminate averaged a strength of 4.7kN in 120 seconds’ heating time and the 1.6mm laminate averaged 9.3kN in 210 seconds.

Details

Rapid Prototyping Journal, vol. 5 no. 2
Type: Research Article
ISSN: 1355-2546

Keywords

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Article
Publication date: 1 March 1964

D.J. Duckworth

A METHOD of joining pipes which does not make use of heavy bulky fittings has always been required in the aircraft industry. In addition, as aircraft speeds increase well…

Abstract

A METHOD of joining pipes which does not make use of heavy bulky fittings has always been required in the aircraft industry. In addition, as aircraft speeds increase well into the supersonic range, the need for more reliable joints that will withstand even more rigorous working conditions becomes apparent.

Details

Aircraft Engineering and Aerospace Technology, vol. 36 no. 3
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 December 2003

Gregory John Gibbons, Robert G. Hansell, A.J. Norwood and P.M. Dickens

This paper details the development of a rapid tooling manufacturing route for the gravity and high‐pressure die‐casting industries, resulting from an EPSRC funded…

Abstract

This paper details the development of a rapid tooling manufacturing route for the gravity and high‐pressure die‐casting industries, resulting from an EPSRC funded collaborative research project between the Universities of Warwick, Loughborough and DeMontfort, with industrial support from, amongst others, MG Rover, TRW Automotive, Sulzer Metco UK Ltd and Kemlows Diecasting Products Ltd. The developed process offers the rapid generation of mould tools from laser‐cut laminated sheets of H13 steel, bolted or brazed together and finish machined. The paper discusses the down‐selection of materials, bonding methods and machining methods, the effect of conformal cooling channels on process efficiency, and the evaluation of a number of test tools developed for the industrial partners. The paper also demonstrates the cost and time advantages (up to 50 and 54 per cent, respectively) of the tooling route compared to traditional fabrication methods.

Details

Assembly Automation, vol. 23 no. 4
Type: Research Article
ISSN: 0144-5154

Keywords

Content available
Article
Publication date: 1 February 2002

Abstract

Details

Anti-Corrosion Methods and Materials, vol. 49 no. 1
Type: Research Article
ISSN: 0003-5599

Keywords

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Article
Publication date: 17 January 2020

David Pánek, Pavel Karban, Tamás Orosz and Ivo Doležel

The purpose of this paper is to compare different reduced-order models for models of control of induction brazing process. In the presented application, the problem is to…

Abstract

Purpose

The purpose of this paper is to compare different reduced-order models for models of control of induction brazing process. In the presented application, the problem is to reconstruct temperature at the points of interests (hot spots) from information measured at accessible places.

Design/methodology/approach

The paper describes the process of induction brazing. It presents the full field model and evaluates the possibilities for obtaining reduced models for temperature estimation. The primary attention is paid to the model based on proper orthogonal decomposition (POD).

Findings

The paper shows that for the given application, it is possible to find low-order estimator. In the examined linear case, the best estimator was created using POD reduced model together with the linear Kalman filter.

Research limitations/implications

The authors are aware of two main limitations of the presented study: material properties are considered linear, which is not a completely realistic assumption. However, if strong coupling and nonlinear material parameters are considered, the model becomes unsolvable. The process and measurement uncertainties are not considered.

Originality/value

The paper deals with POD of multi-physics 3 D application of induction brazing. The paper compares 11 different methods for temperature estimator design.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , vol. 39 no. 1
Type: Research Article
ISSN: 0332-1649

Keywords

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Article
Publication date: 1 August 1997

David Gosling and Keith Upton

Wolverhampton‐based IMI Marston, a wholly owned subsidiary of IMI plc, employs over 500 personnel in five product groups. Its highly successful Aerospace Heat Transfer…

Abstract

Wolverhampton‐based IMI Marston, a wholly owned subsidiary of IMI plc, employs over 500 personnel in five product groups. Its highly successful Aerospace Heat Transfer Group designs and manufactures heat exchangers for a wide marketplace and for a variety of applications. Looks at the increasing complexity of avionics equipment, and the need to dissipate heat in order to maintain a stable operating environment and examines the design, material and process selection in developing materials and products for this sector.

Details

Aircraft Engineering and Aerospace Technology, vol. 69 no. 4
Type: Research Article
ISSN: 0002-2667

Keywords

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Article
Publication date: 1 July 1962

A RECENT visit to the Cricklewood works of Delaney Callay Ltd. revealed what must surely be a unique combination of metal joining facilities including an aluminium salt…

Abstract

A RECENT visit to the Cricklewood works of Delaney Callay Ltd. revealed what must surely be a unique combination of metal joining facilities including an aluminium salt bath and a vacuum brazing furnace. It is intended to devote this article principally to a description of these latter facilities, but we begin with a few words about the Company's background and the philosophy which has led to their claim to a ‘metal joining service unequalled in Europe’.

Details

Aircraft Engineering and Aerospace Technology, vol. 34 no. 7
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 February 1995

D. Mukherjee, K. Balamurugan, V. Balamurugan, K. Balasubramanian, E. Kannan and M. Muruganantham

Introduction Welding and brazing fall into the broad category of engineering joints, where the former is a stronger joint than the latter. Nevertheless, both these joints…

Abstract

Introduction Welding and brazing fall into the broad category of engineering joints, where the former is a stronger joint than the latter. Nevertheless, both these joints are heterogeneous and are susceptible to environmental effects, in the form of enhanced corrosion, due to their retained residual stresses and matrix heterogeneity. Partial melting, micro structural transformation, diffusional alloy layer formation, etc. are some of the phenomena met within these joints. It is argued that relief of stresses, by heating these joints to appropriate temperatures, which are below the transformation temperature range, may deactivate the stress raiser sites, so that susceptibility to micro galvanic action is considerably reduced. Such treatment may also cause thermally‐activated reorganization of the micro structure, resulting in matrix uniformity. Such structural uniformity and stress matching may pay further for reducing the corrosion loss by reduction of micro‐galvanic action.

Details

Anti-Corrosion Methods and Materials, vol. 42 no. 2
Type: Research Article
ISSN: 0003-5599

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