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Article
Publication date: 17 May 2021

Xuewei Fang, Chuanqi Ren, Lijuan Zhang, Changxing Wang, Ke Huang and Bingheng Lu

This paper aims at fabricating large metallic components with high deposition rates, low equipment costs through wire and wire and arc additive manufacturing (WAAM) method, in…

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Abstract

Purpose

This paper aims at fabricating large metallic components with high deposition rates, low equipment costs through wire and wire and arc additive manufacturing (WAAM) method, in order to achieve the morphology and mechanical properties of manufacturing process, a bead morphology prediction model with high precision for ideal deposition of every pass was established.

Design/methodology/approach

The dynamic response of the process parameters on the bead width and bead height of cold metal transfer (CMT)-based AM was analyzed. A laser profile scanner was used to continuously capture the morphology variation. A prediction model of the deposition bead morphology was established using response surface optimization. Moreover, the validity of the model was examined using 15 groups of quadratic regression analyzes.

Findings

The relative errors of the predicted bead width and height were all less than 5% compared with the experimental measurements. The model was then preliminarily used with necessary modifications, such as further considering the interlayer process parameters, to guide the fabrication of complex three-dimensional components.

Originality/value

The morphology prediction of WAAMed bead is a critical issue. Most research has focused on the formability and defects in CMT-based WAAM and little research on the effect of process parameters on the morphology of the deposited layer in CMT-based WAAM has been conducted. To test the sensitivities of the processing parameters to bead size, the dynamic response of key parameters was investigated. A regression model was established to guide the process parameter optimization for subsequent multi-layer or component deposition.

Details

Rapid Prototyping Journal, vol. 27 no. 4
Type: Research Article
ISSN: 1355-2546

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Article
Publication date: 21 November 2008

Joseph Sarkis and Hanmin Zhu

The purpose of this paper is to focus on the developing circular economy (CE) policy within China and its relationship to China's information technology (IT) and IT products…

2451

Abstract

Purpose

The purpose of this paper is to focus on the developing circular economy (CE) policy within China and its relationship to China's information technology (IT) and IT products industry. It provides a framework to understand the role CE plays in sustainability at many levels within China.

Design/methodology/approach

This paper provides a review of the literature and practice in China various information sources including Chinese publications are used to further develop the framework and provide exemplary activities fitting within this framework.

Findings

If The CE program for IT, is to work, these needs to be co‐operation at multiple levels of analysis. A proposed governmental policy can greatly influence sustainability in the IT industry.

Research limitations/implications

This review is based on various sources which may become dated as the CE and regulatory policy that influence IT advance. Understanding the historical perspective and potential future directions can help researchers identify important areas of investigation for future development in this field.

Practical implications

Practically, the framework can help policy makers understand how to structure a previously unstructured and broad policy. Managers at various organizational levels can become more clear on their organizational's IT role in a CE‐like program.

Originality/value

This is the first comprehensive paper that seeks to integrate IT sustainability issues in China. It is one of the first to utilize the CE policy implications on any functional, industrial, and technological group.

Details

Journal of Systems and Information Technology, vol. 10 no. 3
Type: Research Article
ISSN: 1328-7265

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