Performing higher speeds with dynamic feeding gas tungsten arc welding (GTAW) for pipeline applications

Most of pipeline welding still applies manual procedures, which increase production time and is stressful to the welding operator. This happens mainly due to the accurate melt pool control that hand operation enables. It yields high flexibility between material addition and heat source and is theref...

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Veröffentlicht in:Journal of the Brazilian Society of Mechanical Sciences and Engineering 2019, Vol.41 (1), p.1-6, Article 38
Hauptverfasser: e Silva, Régis Henrique Gonçalves, dos Santos Paes, Luiz Eduardo, Marques, Cleber, Riffel, Kaue Correa, Schwedersky, Mateus Barancelli
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container_issue 1
container_start_page 1
container_title Journal of the Brazilian Society of Mechanical Sciences and Engineering
container_volume 41
creator e Silva, Régis Henrique Gonçalves
dos Santos Paes, Luiz Eduardo
Marques, Cleber
Riffel, Kaue Correa
Schwedersky, Mateus Barancelli
description Most of pipeline welding still applies manual procedures, which increase production time and is stressful to the welding operator. This happens mainly due to the accurate melt pool control that hand operation enables. It yields high flexibility between material addition and heat source and is therefore adaptable to the welding condition and situation of each moment. This feature is not fully found when mechanized welding with automatic feeding is performed, despite every benefit of welding automation. This renders an optimized parameterization of a complex task. Automatic orbital welding is already a reality, though only applied in large scale in developed countries and/or by few expert companies from developed countries, due to such controllability, repeatability, and robustness difficulties. In this paper, a concept for dynamic wire feeding and respective implementation and analysis are presented. It consists of a low-frequency wire speed oscillation, aiming to decouple wire speed and arc power to a larger extent, which approaches to manual procedure as it guarantees user flexibility, but still keeping the benefits of welding automation. ASTM 139 Grade D tubes were welded under stable processing conditions. The macrographs did not indicate discontinuities such as porosity or lack of fusion, resulting in complete joint penetration. The average welding speed reached was 27.8 cm/min (10.9 in/min), much higher than that found by other authors.
doi_str_mv 10.1007/s40430-018-1529-2
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This happens mainly due to the accurate melt pool control that hand operation enables. It yields high flexibility between material addition and heat source and is therefore adaptable to the welding condition and situation of each moment. This feature is not fully found when mechanized welding with automatic feeding is performed, despite every benefit of welding automation. This renders an optimized parameterization of a complex task. Automatic orbital welding is already a reality, though only applied in large scale in developed countries and/or by few expert companies from developed countries, due to such controllability, repeatability, and robustness difficulties. In this paper, a concept for dynamic wire feeding and respective implementation and analysis are presented. It consists of a low-frequency wire speed oscillation, aiming to decouple wire speed and arc power to a larger extent, which approaches to manual procedure as it guarantees user flexibility, but still keeping the benefits of welding automation. ASTM 139 Grade D tubes were welded under stable processing conditions. The macrographs did not indicate discontinuities such as porosity or lack of fusion, resulting in complete joint penetration. 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subjects Automatic welding
Automation
Controllability
Engineering
Feeding
Flexibility
Gas tungsten arc welding
Industrialized nations
Mechanical Engineering
Melting
Natural gas
Orbital welding
Parameterization
Photomacrographs
Porosity
Robust control
Stability
Technical Paper
Tubes
Wire
title Performing higher speeds with dynamic feeding gas tungsten arc welding (GTAW) for pipeline applications
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