Keyhole GTAW with Dynamic Wire Feeding Applied to Orbital Welding of 304L SS Pipes

IF 0.3 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING

Soldagem & Inspecao Pub Date : 2019-01-01 DOI:10.1590/0104-9224/SI24.18

K. C. Riffel, R. G. D. Silva, G. Dalpiaz, Cleber Marques, M. B. Schwedersky

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引用次数: 7

Abstract

Abstract Currently, in the Brazilian Oil and Gas scenario the execution of welding processes for stainless steel consists mostly of manual applications, rendering hard any increase in productivity and repeatability. Therefore, the automation of this step allows several advances such as more reliable results, lower costs and healthier condition for welders. With the aim of developing automation for GTAW welding of these applications, experimental tests were carried out in a 304L stainless steel pipe laid out at 5G position. The samples were orbitally welded by GTAW with dynamic wire feeding process, using a robotic manipulator in two steps of 180º in vertical down progression. The welding parameters and the stable condition obtained are discussed and the weld pool behavior during the root pass was online monitored by HDR (High Dynamic Range) videography. It was possible to reach high welding speed in the root pass, 50 cm/min in a keyhole mode. The wire dynamic movement contributed to reach great process stability and robustness for all joint passes, from root to finishing. The macrographs and x-ray analysis did not indicate discontinuities as porosity nor lack of fusion.

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动态送丝锁孔GTAW在304L不锈钢管轨道焊接中的应用

目前，在巴西石油和天然气行业，不锈钢焊接工艺的执行主要由手工操作组成，因此很难提高生产率和可重复性。因此，该步骤的自动化实现了一些进步，例如更可靠的结果，更低的成本和更健康的焊工条件。为了开发这些应用的GTAW焊接自动化，在5G位置布置的304L不锈钢管中进行了实验测试。采用动态送丝的GTAW轨道焊接工艺，采用机械手垂直向下180º两步焊接。讨论了焊接参数及获得的稳定条件，并采用HDR(高动态范围)摄像技术在线监测了焊池在根焊过程中的行为。在根道中可以达到很高的焊接速度，在锁孔模式下可以达到50厘米/分钟。钢丝的动态运动有助于实现从根部到精加工的所有关节通道的巨大工艺稳定性和坚固性。宏观图和x射线分析没有显示不连续性，如孔隙或缺乏融合。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Soldagem & Inspecao 工程技术-冶金工程

CiteScore

1.00

自引率

16.70%

发文量

审稿时长

12 weeks

期刊介绍： The Journal Soldagem & Inspeção (S&I) js a techno-scientific journal created in 1995. Printed issues of this journal are distributed free of charge to libraries in Brazil, Latin America and the Iberian Peninsula. It has been printed regularly every quarter since September, 2002, and, since the beginning of 2007, its electronic version is available in the address: (http://www.abs-soldagem.org.br/s&i/). The journal is sponsored by the Brazilian Welding Association (ABS). Since its creation several well known professionals working in welding contributed with the Journal Soldagem & Inspeção and its editorial board crosses the Brazilian borders. During its evolution the Journal received ta special contribution from the Editors-in-chief : Ronaldo Paranhos, Américo Scoti, Paulo Modenesi e Alexandre Bracarence. Since January 2012 the Editor-in-chief is Ana Sofia C. M. D’Oliveira, Full professor at Universidade Federal do Paraná (UFPR) . Her work focus mainly on Hardfacing and Physical Metallurgy. The jornal Soldagem & Inspeção also counts with 10 Associate Editors and a fix Editorial board of referees. short-term (Ad Hoc) referees can be invited to evaluate some papers submitted to the journal. The Soldagem & Inspeção journal is the scientific divulgation channel of the Brazilian Welding Association (ABS). It aims to publish original papers related to the scientific and technological development of welding, inspection, and related fields. Review papers or letters on current and controversial subjects are also published in the Journal. Its abbreviated title is Soldag. insp. (Impr.), which should be used in bibliographies, footnotes and bibliographical references and strips.