Plasma arc welding: Process, sensing, control and modeling

Wu, Chuansong; Wang, L.; Ren, Wenjing; Zhang, X.Y.

doi:10.1016/j.jmapro.2013.06.004

Cited by 141 publications

(54 citation statements)

References 23 publications

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“…It applies an extra outer tube inserting gas to 7 constrain the high temperature plasma torch. Through this approach, PAW can achieve a high-power density and temperature torch, which is estimated to be in excess of 11000K, whereas GTAW and GMAW torches are in the region of 7000K (Wu et al 2014). To avoid the deposited metal becoming oxidized in the high temperature environment, all three types of welding methods insert shielding gas around the torch as shown in Figure 1.…”

Section: Overview For Waammentioning

confidence: 99%

Realisation of a multi-sensor framework for process monitoring of the wire arc additive manufacturing in producing Ti-6Al-4V parts

Dhokia

Colegrove

et al. 2018

International Journal of Computer Integrated Manufacturing

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Wire arc additive manufacturing (WAAM) is arc welding based additive manufacture which is providing a major opportunity for the aerospace industry to reduce buy-to-fly ratios from 20:1 with forging and machining to 5:1 with WAAM. The WAAM method can build a wide range of near net shapes from a variety of high grade (metallic) materials at high deposition speeds without the need for costly moulds. However, current WAAM methods and technologies are unable to produce parts reliably and with consistent structural material properties and required dimensional accuracy. This is due to the complexity of the process and the lack of process control strategies. This paper makes a brief review on monitoring methods that have been used in WAAM or similar processes. The authors then identify the requirements for a WAAM monitoring system based on the common attributes of the process. Finally, a novel multi-sensor framework is realised which monitors the system voltage/current, part profile and environmental oxygen level. The authors provide a new signal process technique to acquire accurate voltage and current signal without random noises thereby significantly improving the quality of WAAM manufacturing.

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Section: Overview For Waammentioning

confidence: 99%

Realisation of a multi-sensor framework for process monitoring of the wire arc additive manufacturing in producing Ti-6Al-4V parts

Dhokia

Colegrove

et al. 2018

International Journal of Computer Integrated Manufacturing

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“…Дежурная дуга постоянного тока загорается между электродом-катодом плазмотрона и плазмообразующим соплом-анодом, а вторая дуга переменного тока горит между электродом плазмотрона и издели-ем (рис. 1) [9]. После того как основная дуга зажигается, дежурная размыкается.…”

Section: Plasma Welding Of Aluminum Alloys Of Small Thicknessesunclassified

Plasma welding of aluminum alloys of small thicknesses

Bazhenov¹,

Panov²,

Gilev³

2015

PNRPUM

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Пермский национальный исследовательский политехнический университет, г. Пермь, Россия ПЛАЗМЕННАЯ СВАРКА АЛЮМИНИЕВЫХ СПЛАВОВ МАЛЫХ ТОЛЩИНПредставлены результаты разработки технологии плазменной сварки плазменной дугой током обратной полярности с одновременной подачей присадочной проволоки, алюминиевых сплавов АМг5 толщиной 2 мм. Алюминиевые сплавы обладают уникальными свойствами, что обусловливает их широкое применение в авиа-и судостроении, производстве химической аппа-ратуры, строительстве. Однако существует ряд факторов, которые значительно усложняют про-цесс сварки алюминия. Стоит отметить, что при сварке алюминиевых сплавов малых толщин по-являются дополнительные трудности в технологии изготовления конструкций. Это в первую оче-редь связано с правильным выбором параметров режима и недопущением прожога, а также применением специальных подкладных приспособлений. В данной статье представлен анализ современных методов сварки алюминия малых толщин. Приведен вариант сварки алюминиевых сплавов плазменной дугой при работе плазмотрона на обратной полярности тока. Применение плазменной дуги позволяет использовать высококонцентрированный источник энергии, получить бездефектный сварной шов. Показано, что использование тока обратной полярности обеспечи-вает качественную очистку поверхности металла от загрязнений и оксидной пленки, процесс плазменной сварки значительно увеличивает производительность процесса. Установлена зави-симость геометрии шва от скорости подачи проволоки.Ключевые слова: плазменная сварка, плазмотрон, алюминиевые сплавы, прямая по-лярность, обратная полярность, катодная очистка, вольфрамовые включения, геометрия шва, пористость, автоматизация. A.M. Bazhenov, A.I. Panov, I.A. GilevPerm National Research Polytechnic University, Perm, Russian Federation PLASMA WELDING OF ALUMINUM ALLOYS OF SMALL THICKNESSESThe results of the development of technologies for plasma welding, plasma arc current of reverse polarity with simultaneous supply of welding wire, aluminum alloys AMg5 2 mm thick. Aluminum alloys have unique properties that make them a wide application in aircraft and shipbuilding, chemical equipment, construction. However, aluminum has a number of factors which greatly complicate the process of welding. It should be noted that when welding aluminum alloy of small thickness have additional difficulties in manufacturing technology. This is primarily due to the right choice of parameters and preventing burn-through mode, as well as the use of special devices backer. This article presents an analysis of modern methods of welding aluminum small thicknesses. A version of welding of aluminum alloys at the plasma arc torch to reverse the polarity of the current. The use of the plasma arc

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“…In past decades, control system of variable polarity plasma arc welding (VPPAW) power supply has great development in control structure, control means and control laws [1], [2]. The VPPAW has the advantages of small welding defects, good cathode cleaning effect, strong penetration ability and small deformation of workpiece.…”

Section: Introductionmentioning

confidence: 99%

Research on Adaptive Controller for Variable Polarity Plasma Arc Welding Power Supply with High-Frequency

Zhou

Zheng

2019

MATEC Web Conf.

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Aiming at the problem of output current waveform distortion caused by superimposed high frequency components in the output current of varying polarity of VPPAW power supply. A novel adaptive PID controller with automatic switching is introduced in this paper, and the controller is established based on the evolution path of the operating point of the VPPAW power supply. Compared with the traditional linear PID controller, the adaptive controller proposed in this paper is very suitable for the control of arc load with strong dynamic characteristics and can effectively improve output waveform of the welding system.

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Plasma arc welding: Process, sensing, control and modeling

Cited by 141 publications

References 23 publications

Realisation of a multi-sensor framework for process monitoring of the wire arc additive manufacturing in producing Ti-6Al-4V parts

Realisation of a multi-sensor framework for process monitoring of the wire arc additive manufacturing in producing Ti-6Al-4V parts

Plasma welding of aluminum alloys of small thicknesses

Research on Adaptive Controller for Variable Polarity Plasma Arc Welding Power Supply with High-Frequency

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