Measurement of dynamical variation in two-dimensional temperature distribution of TIG pulsed-arcs

Sawato, Hiroshi; Tashiro, Shinichi; Nakata, Kazuhiro; Tanaka, Manabu; Yamamoto, Eri; Yamazaki, Kei; Suzuki, Keiichi

doi:10.2207/qjjws.29.23s

Cited by 5 publications

(1 citation statement)

References 2 publications

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“…Although this system had the advantage that the camera calibration was not necessary, it was not applicable to a nonsteady state arc plasma such as pulsed TIG arc because it requires that the arc plasma is a steady state. There are some studies measuring the axially symmetric pulsed arc [6,14]. To measure the axially asymmetric and non-steady state arc, a simultaneous and multidirectional measurement system is required.…”

Section: Introductionmentioning

confidence: 99%

Temperature measurement of asymmetrical pulsed TIG arc plasma by multidirectional monochromatic imaging method

et al. 2014

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Arc plasma diagnostics by spectroscopy have been often used to measure the arc properties, such as the temperature. Measurements of an axially asymmetrical arc plasma require the optical computed tomography technique. This study constructed the simultaneous and multidirectional measurement system by six sets of CCD camera and interference filter with monochromatic imaging method. The deviation of the central wavelength of the filters was calibrated by tilting operation, and the sensitivity of detectors was calibrated by referencing the stationary and axially symmetric tungsten inert gas (TIG) arc plasma. We could perform the temperature measurement of the transient and asymmetrical TIG arc plasma such as in the transition period between the peak 150 A and base 10 A current of a 50 Hz pulsed TIG arc with 30°t ilted torch. It was revealed that the high-temperature area of 30°tilted arc is larger than that of perpendicular arc. The comparison of pulsed and continuous arcs shows that the arc shape and the temperature variation reasonably followed the current change as long as the changing rate was about −113 A/ ms.

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Section: Introductionmentioning

confidence: 99%

Temperature measurement of asymmetrical pulsed TIG arc plasma by multidirectional monochromatic imaging method

et al. 2014

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Effect of plasma welding current on heat source penetration ability of plasma-GMAW hybrid welding

Han

Han²,

Sun³

et al. 2022

Int J Adv Manuf Technol

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In the plasma-gas metal arc welding (GMAW) hybrid welding of aluminum alloy, the weld penetration under different plasma welding currents was compared. When the plasma welding current was lower than 150 A, the hybrid welding penetration was greater than the sum of the single plasma welding and the single GMAW penetration. When the plasma welding current reached 130 A, with the increase of the plasma welding current, the advantage of the weld penetration of the hybrid welding was gradually weakened compared with that of the single welding. The above change mechanism is revealed from the perspectives of heat source energy distribution and molten pool stress. The results show that when the plasma welding current is lower than 110 A, the area of the high-temperature region in the arc zone of GMAW in the hybrid welding increases compared with that in the single GMAW. The trend of arc energy transfer to the penetration direction increases under the action of arc pressure, arc shear force, electromagnetic force, and droplet impact. With the increase of plasma welding current, the hightemperature area of the GMAW arc rst increases and then decreases. When the plasma current reaches 130 A, the effect of arc pressure, arc shear force, electromagnetic force, and droplet impact on increasing the penetration begins to weaken.1 Introduction gas metal arc welding (GMAW) is widely used in aluminum alloy welding because of its easy automation and high production e ciency [1,2]. When welding thick-plated high-strength aluminum alloys using GMAW process, the weld requires multilayer welding because the GMAW arc energy is not concentrated. However, high heat input will lead to a series of welding problems, such as coarse grain, crack and so on, which will reduce the mechanical properties of welded joints [3]. In order to solve the above problems, the high energy beam was combined with GMAW to increase the penetration and reduce the welding heat input. The most common is laser -GMAW hybrid welding and plasma -GMAW hybrid welding. For laser-GMAW hybrid welding, aluminum alloy has a strong re ection on laser, and plasma absorbs laser energy, which reduces laser e ciency. Moreover, due to the high welding speed, pores are easily formed [4].Plasma-GMAW hybrid welding can effectively avoid the above problems.According to the relative position of the heat source space, plasma-GMAW hybrid welding is divided into coaxial and paraxial. In 1972, Essers et al. [5] in Philips Research Laboratories rstly introduced the coaxial plasma-GMAW process. The wire is surrounded by double arcs and the number of melting coating increases [6][7][8]. However, due to the plasma arc surrounding the GMAW arc, the plasma arc compression effect decreases. Nonetheless, given the coaxial welding torch structure and the coupling effects between the plasma and GMAW arc [9, 10], the arc divergence has the effect of reducing the speed of the droplets arriving at the weld pool [11,12]. Divergence of plasma arc and reduction of droplet momentum are unfavorable to weld p...

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Numerical investigation of the arc behaviour and air transport during pulsed tungsten inert gas arc-based additive manufacturing

Wang,

Tashiro,

Tanaka

et al. 2023

Int J Adv Manuf Technol

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Measurement of dynamical variation in two-dimensional temperature distribution of TIG pulsed-arcs

Cited by 5 publications

References 2 publications

Temperature measurement of asymmetrical pulsed TIG arc plasma by multidirectional monochromatic imaging method

Temperature measurement of asymmetrical pulsed TIG arc plasma by multidirectional monochromatic imaging method

Effect of plasma welding current on heat source penetration ability of plasma-GMAW hybrid welding

Numerical investigation of the arc behaviour and air transport during pulsed tungsten inert gas arc-based additive manufacturing

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