Thermal analysis for single-pass multi-layer GMAW based additive manufacturing using infrared thermography
Thermal analysis for single-pass multi-layer GMAW based additive manufacturing using infrared thermography
复制标题
使用红外热成像技术对基于单通道多层 GMAW 的增材制造进行热分析
DOI：
10.1016/j.jmatprotec.2017.01.024
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发表时间：
2017-06-01
影响因子：
6.3
通讯作者：
Zhang, Guangjun
中科院分区：
文献类型：
--
作者：
Yang, Dongqing;Wang, Gang;Zhang, Guangjun
为了研究基于增材制造的熔化极气体保护焊（GMAW）的热行为，利用标定后的红外摄像机采集了熔敷薄壁件的表面温度。温度场云图表明，随着熔敷高度的增加，熔敷部位的热积聚现象越来越严重。通过延长层间冷却时间，薄壁件的高温区和平均温度减小，熔敷件的温度梯度和冷却速率增大。但是过长的层间冷却时间不能有效地减少沉积件的热积累，并且会使沉积过程耗时。通过对不同层间冷却时间的最终成形件的成形外观进行比较，发现适当延长层间冷却时间有助于提高表面质量，减小总高度差。采用交替层间冷却时间可以在不增加熔敷时间的情况下显著提高GMAW基AM薄壁件的成形质量。(C)2017爱思唯尔B.V.保留所有权利。
An infrared camera after calibration test was used to capture the surface temperature of the deposited thin-wall parts for investigating the thermal behavior of gas metal arc welding (GMAW) based additive manufacturing (AM). The temperature field cloud pictures indicated that as the deposition height increased, the heat accumulation of the deposited parts became serious. Through extendirig the inter layer cooling time, the high temperature area and the mean temperature of the thin-wall part decreased while the temperature gradient and cooling rate of the deposited part increased. But excessive inter layer cooling time cannot reduce heat accumulation of the deposited parts effectively and will make the deposition process time-consuming. The comparison of the final parts in forming appearance with different inter-layer cooling time indicated that the moderate prolongation of inter-layer cooling time contributed to improvement of the surface quality and reduction of the total height difference. Using the alternate inter-layer cooling time can improve the forming quality of the thin-wall part distinctly with a little increase of the deposition time in GMAW based AM. (C) 2017 Elsevier B.V. All rights reserved.