Monitoring process stability in GTA additive manufacturing based on vision sensing of arc length

Measurement ◽  
2021 ◽  
pp. 110001
Author(s):  
Menghan Shi ◽  
Jun Xiong ◽  
Guangjun Zhang ◽  
Senmu Zheng
2021 ◽  
Author(s):  
Ashish Kulkarni ◽  
Prahar M. Bhatt ◽  
Alec Kanyuck ◽  
Satyandra K. Gupta

Abstract Robotic Wire Arc Additive Manufacturing (WAAM) is the layer-by-layer deposition of molten metal to build a three-dimensional part. In this process, the fed metal wire is melted using an electric arc as a heat source. The process is sensitive to the arc conditions, such as arc length. While building WAAM parts, the metal beads overlap at corners causing material accumulation. Material accumulation is undesirable as it leads to uneven build height and process failures caused by arc length variation. This paper introduces a deposition speed regulation scheme to avoid the corner accumulation problem and build parts with uniform build height. The regulated speed has a complex relationship with the corner angle, bead geometry, and molten metal dynamics. So we need to train a model that can predict suitable speed regulations for corner angles encountered while building the part. We develop an unsupervised learning technique to characterize the uniformity of the bead profile of a WAAM built layer and check for anomalous bead profiles. We train a model using these results that can predict suitable speed regulation parameters for different corner angles. We test this model by building a WAAM part using our speed regulation scheme and validate if the built part has uniform build height and reduced corner defects.


2020 ◽  
Vol 283 ◽  
pp. 116723
Author(s):  
Diego Raimundi Corradi ◽  
Alexandre Queiroz Bracarense ◽  
Bintao Wu ◽  
Dominic Cuiuri ◽  
Zengxi Pan ◽  
...  

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Klaus Solberg Soilen

If the last issue of JISIB was a special issue where the discipline was reflecting on itself, then this issues shows some of the width and scope of the field. The conceptual article by Nienaber and Sewdass presents a relatively new concept of workforce intelligence, and links it to competitive advantage by way of predictive analytics. The article by Solberg Søilen is an attempt to lay out a broad scientific agenda for the area of intelligence studies in business.Empirical findings come from a survey, but in the discussion the author argues for why the study should define itself as much broader than what the survey data implies, breaking out of the current dominating scientific paradigm. The article by Fourati-Jamoussi and Niamba is an updated evaluation of business intelligence tools, a frequently reoccurring topic. However, this time it is not a simple evaluation of existing software, but an evaluation by users to helpdesigners of business intelligence tools get the best efficiency out of a monitoring process. The article by Calof is an evaluation of government sponsored competitive intelligence for regional and sectoral economic development in Canada. The article concludes that it is possible tocalculate positive economic impacts from these activities. Rodríguez Salvador and Hernandez de Menéndez come back to a field that has become a specialty for Rodríguez Salvador: scientific and industrial intelligence based on scientometric patent analysis. This time she looks at bio-additive manufacturing using advanced data mining software and interviews with experts.


2019 ◽  
Vol 2 (2) ◽  
pp. 121-125
Author(s):  
Sándor Uzonyi

Abstract In this paper the investigated conditions and possibilities of repairing forging dies with high precision robotic MAG welding are presented. Different welding wire electrodes were examined and compared by their processability. Productivity, process stability, slag and fume formation were in the focus of investigation. Metallographic tests were carried out to validate the compliance of welded layers. Based on the performance of the wire electrodes, recommendations have been elaborated for the procedure specification and also for further investigation. Some robot cell layouts have been designed adapting to the special working environment and requirements of the welding procedure.


Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 84
Author(s):  
Wojciech Jamrozik ◽  
Jacek Górka

Arc length is a crucial parameter of the manual metal arc (MMA) welding process, as it influences the arc voltage and the resulting welded joint. In the MMA method, the process’ stability is mainly controlled by the skills of a welder. According to that, giving the feedback about the arc length as well as the welding speed to the welder is a valuable property at the stage of weld training and in the production of welded elements. The proposed solution is based on the application of relatively cheap Complementary Metal Oxide Semiconductor (CMOS) cameras to track the welding electrode tip and to estimate the geometrical properties of welding arc. All measured parameters are varying during welding. To validate the results of image processing, arc voltage was measured as a reference value describing in some part the process stability.


2019 ◽  
Vol 25 (5) ◽  
pp. 809-819 ◽  
Author(s):  
Xiaolong Wang ◽  
Aimin Wang ◽  
Kaixiang Wang ◽  
Yuebo Li

Abstract Purpose Traditional gas tungsten arc welding (GTAW) and GTAW-based wire and arc additive manufacturing (WAAM) are notably different. These differences are crucial to the process stability and surface quality in GTAW WAAM. This paper addresses special characteristics and the process control method of GTAW WAAM. The purpose of this paper is to improve the process stability with sensor information fusion in omnidirectional GTAW WAAM process. Design/methodology/approach A wire feed strategy is proposed to achieve an omnidirectional GTAW WAAM process. Thus, a model of welding voltage with welding current and arc length is established. An automatic control system fit to the entire GTAW WAAM process is established using both welding voltage and welding current. The effect of several types of commonly used controllers is examined. To assess the validity of this system, an arc length step experiment, various wire feed speed experiments and a square sample experiment were performed. Findings The research findings show that the resented wire feed strategy and arc length control system can effectively guarantee the stability of the GTAW WAAM process. Originality/value This paper tries to make a foundation work to achieve omnidirectional welding and process stability of GTAW WAAM through wire feed geometry analysis and sensor information fusion control model. The proposed wire feed strategy is implementable and practical, and a novel sensor fusion control method has been developed in the study for varying current GTAW WAAM process.


Sensors ◽  
2018 ◽  
Vol 18 (4) ◽  
pp. 1180 ◽  
Author(s):  
Zhongwei Li ◽  
Xingjian Liu ◽  
Shifeng Wen ◽  
Piyao He ◽  
Kai Zhong ◽  
...  

2019 ◽  
Vol 46 (11) ◽  
pp. 1102005
Author(s):  
马波 Ma Bo ◽  
高向东 Gao Xiangdong ◽  
黄怡洁 Huang Yijie ◽  
张艳喜 Zhang Yanxi ◽  
游德勇 You Deyong ◽  
...  

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