Study on automatic control of arc gap in robotic TIG welding

Karafi, Mohammad Reza; Narimani, Ramin; Hojjat, Yousef; Gheybi, Mojtaba

doi:10.1007/s00170-010-2564-z

Cited by 14 publications

(7 citation statements)

References 13 publications

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“…Na podstawie wyników badań eksperymentalnych [9] urządzeń spawalniczych TIG w osłonie argonu (rys. 2) i po przeprowadzeniu obliczeń numerycznych, można zaproponować nową funkcję aproksymującą charakterystyki statyczne w postaci a) b)…”

Section: )unclassified

“…2. Punkty pomiarowe charakterystyk statycznych łuku rzeczywistego urządzenia TIG (elektroda wolframowa torowana (1%) o średnicy 2,4 mm) [9] oraz ich aproksymacje wyrażeniem (2) Fig. 2.…”

Section: )unclassified

“…Na podstawie danych pomiarowych [9] wyznaczono przyelektrodowy spadek napięcia (a = UAK = 9,868 V). Obliczono go metodą ekstrapolacji liniowej na podstawie zmian długości łuku (8 mm, 4 mm, 2 mm).…”

Section: )unclassified

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Aproksymacja charakterystyk statycznych i modelowanie łuku elektrycznego w procesie spawania metodą TIG

Haltof

2016

Przegląd Spawalnictwa

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W artykule zaprezentowano funkcję aproksymującą charakterystyki statyczne łuku spawalniczego uwzględniającą wpływ wybranych warunków zewnętrznych. Na podstawie pomiarów zasilacza spawalniczego typu TIG wyznaczono stałe współczynniki aproksymacji i zaimplementowano ją w uniwersalnym modelu matematycznym łuku elektrycznego Pentegowa. Za pomocą programu MATLAB-Simulink wykonano symulacje procesów w obwodzie z makromodelem łuku elektrycznego i wymuszeniem prądowym impulsowym unipolarnym.

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Section: )unclassified

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Aproksymacja charakterystyk statycznych i modelowanie łuku elektrycznego w procesie spawania metodą TIG

Haltof

2016

Przegląd Spawalnictwa

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“…Many scholars have studied several welding process stability methods. According to the different types, four control strategies are commonly used: welding voltage detection using a voltage sensor and achieving a stable voltage control method (Karafi et al, 2010;Wang et al, 2017;Hu et al, 2017), stabilizing the welding pass width by controlling the wire feed speed or welding speed through machine vision of the measured bead width (Tsai et al, 2006), controlling the welding process parameters to achieve stable welding according to the penetration and weld pool geometry measured by machine vision (Kovacevic et al, 1995;Chen et al, 2009;Wang, 2015) and analysing the arc spectrum component to adjust the welding control (Zhiyong et al, 2009). Among the GTAW process stability control methods, the method of measuring the weld pool area using machine vision and the welding voltage feedback method can effectively extract arc length and are suitable for WAAM.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the welding voltage feedback method is more effective and easier to implement. Karafi et al (2010) analysed power supply characteristics to obtain an optimum operating point and used a PI controller to control the arc length. However, these methods are only applicable to traditional automatic welding control, and the target welding voltage may change dynamically in GTAW WAAM because of the adjustment of the welding current value in each deposited layer (Ouyang et al, 2002;Wang et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Process stability for GTAW-based additive manufacturing

Wang

et al. 2019

RPJ

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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.

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