Journal ArticleDOI
Wire arc additive manufacturing of Al-6Mg alloy using variable polarity cold metal transfer arc as power source
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TLDR
In this article, a variable polarity cold metal transfer (VP-CMT) arc power source with different arc modes was employed in additive manufacturing Al-6Mg alloy parts.Abstract:
A variable polarity cold metal transfer (VP-CMT) arc power source with different arc modes was employed in additive manufacturing Al-6Mg alloy parts. The microstructures were characterized using scanning electron microscopy with electron back-scattered diffraction. Even equiaxed grains in size of 20.6–28.5 µm with random orientation were obtained under VP-CMT mode, while a large number of columnar grains in bigger size exist in samples under other arc modes. Tensile strength of the VP-CMT sample with a maximum of 333 MPa is higher than that of the Al-6Mg wrought alloys due to fine-grain strengthening. However, the tensile strength of the VP-CMT sample in different tensile direction was anisotropic, with a percentage of 8–27%. The comprehensive analysis of defects and grain orientation showed that the micro pores in interlayer pore region lead to the anisotropy.read more
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Invited review article: Strategies and processes for high quality wire arc additive manufacturing
TL;DR: In this article, the authors identified the materials processing challenges in wire-arc additive manufacturing (WAAM), including high residual stresses, undesirable microstructures, and solute segregation and phase transformations at solidification.
Journal ArticleDOI
Current Status and Perspectives on Wire and Arc Additive Manufacturing (WAAM)
Tiago A. Rodrigues,Valdemar R. Duarte,Rosa Maria Mendes Miranda,Telmo G. Santos,João Pedro Oliveira +4 more
TL;DR: This review paper aims to provide an overview of the most significant achievements in WAAM, highlighting process developments and variants to control the microstructure, mechanical properties, and defect generation in the as-built parts; the most relevant engineering materials used; the main deposition strategies adopted to minimize residual stresses and the effect of post-processing heat treatments to improve the mechanical properties of the parts.
Journal ArticleDOI
A review of wire arc additive manufacturing and advances in wire arc additive manufacturing of aluminium
TL;DR: Although wire arc additive manufacturing (WAAM) has proven its capability of fulfilling demands of production of medium-to-large-scale components for automotive and allied sectors made up of alumin...
Journal ArticleDOI
Effect of heat input on microstructure and mechanical properties of Al-Mg alloys fabricated by WAAM
TL;DR: In this paper, a wire and arc additive manufacture (WAAM) system, based on cold metal transfer (CMT) technology, was used to manufacture Al Mg alloys, where an aluminum-magnesium ER5356 wire was employed as the filler metal to build alloys with different heat input by adjusting wire feed speed and travel speed.
Journal ArticleDOI
Microstructural evolution and mechanical properties of a low-carbon low-alloy steel produced by wire arc additive manufacturing
TL;DR: In this article, a wire arc additive manufacturing (WAAM) method was used to fabricate a low carbon low-alloy steel wall using a gas metal arc welding (GMAW) torch translated by six-axis robotic arm.
References
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Journal ArticleDOI
Metal Additive Manufacturing: A Review
TL;DR: The state-of-the-art of additive manufacturing (AM) can be classified into three categories: direct digital manufacturing, free-form fabrication, or 3D printing as discussed by the authors.
Journal ArticleDOI
Laser additive manufacturing of metallic components: materials, processes and mechanisms
TL;DR: Additive manufacturing implies layer by layer shaping and consolidation of powder feedstock to arbitrary configurations, normally using a computer controlled laser as discussed by the authors, which is based on a novel materials incremental manufacturing philosophy.
Journal ArticleDOI
Metal Fabrication by Additive Manufacturing Using Laser and Electron Beam Melting Technologies
Lawrence E Murr,Sara M. Gaytan,D. A. Ramirez,E. Martinez,Jennifer Hernandez,Krista Amato,P. W. Shindo,Francisco Medina,Ryan B. Wicker +8 more
TL;DR: In this paper, a comparative study of selective laser melting (SLM) and electron beam melting (EBM) is presented for the fabrication of complex, multi-functional metal or alloy monoliths by CAD-directed, selective melting of precursor powder beds.
Journal ArticleDOI
Wire + Arc Additive Manufacturing
Stewart W. Williams,Filomeno Martina,Adrian C. Addison,Jialuo Ding,Goncalo Pardal,Paul A. Colegrove +5 more
TL;DR: In this article, the benefits of non-destructive testing, online monitoring and in situ machining are discussed, and strategies on how to manage residual stress, improve mechanical properties and eliminate defects such as porosity are suggested.
Journal ArticleDOI
Wire-feed additive manufacturing of metal components: technologies, developments and future interests
TL;DR: In this paper, an in depth review of various process aspects of wire-feed additive manufacturing, including quality and accuracy of wirefeed AM processed components, is presented, and the overall objective is to identify the current challenges for wire feed additive manufacturing as well as point out the future research direction.