Abstract
In order to build a better understanding of the relationship between depositing mode and porosity, microstructure, and properties in wire + arc additive manufacturing (WAAM) 2319-Al components, several Al-6.3%Cu deposits were produced by WAAM technique with cold metal transfer (CMT) variants, pulsed CMT (CMT-P) and advanced CMT (CMT-ADV). Thin walls and blocks were selected as the depositing paths to make WAAM samples. Porosity, microstructure and micro hardness of these WAAM samples were investigated. Compared with CMT-P and thin wall mode, CMT-ADV and block process can effectively reduce the pores in WAAM aluminum alloy. The microstructure varied with different depositing paths and CMT variants. The micro hardness value of thin wall samples was around 75 HV from the bottom to the middle, and gradually decreased toward the top. Meanwhile, the micro hardness value ranged around 72–77 HV, and varied periodically in block samples. The variation in micro hardness is consistent with standard microstructure characteristics.
Highlights
Additive manufacturing (AM) is a new technology, with which a structure can be created by depositing successive layers
Itzone can be seen that the microstructure grows from columnar (CLZ) to equiaxed non-dentrite (NEQZ)
Compared with the cold metal transfer (CMT)-P process, the porosity can be reduced with the CMT-ADV process
Summary
Additive manufacturing (AM) is a new technology, with which a structure can be created by depositing successive layers. This approach has been considered to be an alternative, economic process for producing metallic components due to its potential benefits of saving lead time and costs [1]. Bai et al [11] reported their work on the mechanical properties of the additively manufactured process [13], with a focus of the effect of inter-layer cold working and post-deposition heat treatment. Thin walls and blocks of WAAM Al‐6.3%Cu alloy samples were built with CMT in its pulsed (CMT‐P). Experiments were carried out with a cold metal transfer wire + arc additive manufacturing. CMT(Fronius, 4000R power supply (Fronius, Pettenbach, with wire feeder andprocess a CMT torch (Fronius, gas Austria), an (GMAW)
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