Recognition of Weld Penetration During K-TIG Welding Based on Acoustic and Visual Sensing

Zhu, Tao; Shi, Yonghua; Cui, Shuwan; Cui, Yanxin

doi:10.1007/s11220-018-0224-9

Cited by 20 publications

(4 citation statements)

References 21 publications

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“…When the absolute value of the first derivative there exceeds the threshold and has a different sign with the first derivative of the previous edge, it is judged as a valid edge. The following are the basic steps of the edge detection algorithm [23].…”

Section: Embedded Mapping Recognition Systemmentioning

confidence: 99%

Research on mapping recognition of arc welding molten pool characterisation and penetration state based on embedded system

Zhu

Liu

2023

IET Computers & Digital Tech

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In order to explore the mapping recognition of arc welding molten pool characterisation and penetration state, according to the idea of embedded system construction, this article adopts the idea of software and hardware co-design to find the zero-crossing point of the second derivative in welding image edge detection, and give a threshold. When the absolute value of the first-order derivative exceeds the threshold and has a different sign with the first-order derivative of the previous edge, it is judged as a valid edge. The welding current adopts a symmetrical pulsed AC square wave, and the proportion of heat flow input is high. At the base current, the arc light is darker, so a clear image is obtained. This article designs a simulation experiment to verify the effect of the embedded system in this article. From the experimental research, it can be known that the embedded system constructed in this article can play a certain role in the mapping recognition of the arc welding molten pool characterisation and penetration state.

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Section: Embedded Mapping Recognition Systemmentioning

confidence: 99%

Research on mapping recognition of arc welding molten pool characterisation and penetration state based on embedded system

Zhu

Liu

2023

IET Computers & Digital Tech

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“…On the other hand, since K-TIG has a narrower operating window for carbon steel because of its higher thermal conductivity, several studies have focused on the keyhole behaviour and stability improvement, such as the application of back purging unit [15], one pulse one keyhole technique [16] and high frequency pulse current waveform [17]. Furthermore, in order to develop on-line control strategy for the K-TIG welding process, several penetration monitoring systems have been developed, such as arc voltage-based oscillation frequency sensing [18] and combination of acoustics and vision-based sensing [19].…”

Section: Of 15mentioning

confidence: 99%

Effect of Heat Input on Weld Formation and Tensile Properties in Keyhole Mode TIG Welding Process

Fei

Pan

Cuiuri

et al. 2019

Metals

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Keyhole mode Tungsten Inert Gas (K-TIG) welding is a novel advanced deep penetration welding technology which provides an alternative to high power density welding in terms of achieving keyhole mode welding. In order to facilitate welding procedure optimisation in this newly developed welding technology, the relationship among welding parameters, weld formation and tensile properties during the K-TIG welding was investigated in detail. Results show that except for travel speed, the heat input level also plays an important role in forming undercut defect by changing the plasma jet trajectory inside keyhole channel, leading to the formation of hump in the weld centre and exacerbation of undercut formation. Both undercut defect and root side fusion boundary can act as a stress concentration point, which affects the fracture mode and tensile properties considerably. The research results provide a practical guidance of process parameter optimisation and quality assurance for the K-TIG welding process.

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“…It was found that the features, shape and position of the keyhole were related to the current, and the center of the oval keyhole was offset from the center axis of the welding torch. Cui et al [12] successfully realized K-TIG welding with 4 mm thickness by using square wave pulse welding current. It was found that K-TIG welding had a very narrow welding process parameter window by using high-speed photographic imaging technology.…”

Section: Introductionmentioning

confidence: 99%

Mechanism study of flow characteristics of molten pool and keyhole dynamic behavior of K-TIG welding

Cui,

Dai,

et al. 2023

Preprint

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The stability and reliability of K-TIG welding depend on the flow characteristics of molten pool and the dynamic behavior of keyhole. In order to explain the variation mechanism between the flow behavior of liquid metal and the dynamic behavior of the keyhole while taking electromagnetic force, surface tension, buoyancy, etc. into consideration, this work developed a mathematical model of K-TIG welding. The simulation results of the keyhole exit were compared with images of the keyhole exit taken by the high-speed CCD camera and the keyhole exit characteristics parameters, and the deviation of keyhole outlet parameters XL and YL under each group of process parameters were less than 0.2 mm, and the deviation of SA was less than 0.4 mm2. The flow trend of molten metal in keyhole formation was mainly from the center of keyhole to the surrounding of the keyhole under the consideration of electromagnetic force, surface tension, etc. The trend of melt pool distribution decreased along the perimeter of the keyhole and the thickness of the workpiece, and the overall flow field was stepped. Moreover, the keyhole exit was in a dynamic equilibrium state under the action of gravity, surface tension and arc pressure. The reduction in welding speed accelerated the formation of the keyhole exit and increased the maximum flow velocity of molten metal under the influence of Marangoni forces.

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Recognition of Weld Penetration During K-TIG Welding Based on Acoustic and Visual Sensing

Cited by 20 publications

References 21 publications

Research on mapping recognition of arc welding molten pool characterisation and penetration state based on embedded system

Research on mapping recognition of arc welding molten pool characterisation and penetration state based on embedded system

Effect of Heat Input on Weld Formation and Tensile Properties in Keyhole Mode TIG Welding Process

Mechanism study of flow characteristics of molten pool and keyhole dynamic behavior of K-TIG welding

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