The Spectral Analysis of TIG Welding Filled with Flux-Cored Wire
LIU Ying1, YANG Li-jun1,2*, HE Tian-xi1, ZHAI Yong-lei1, LIU Tong1
1. School of Material Science and Engineering, Tianjin University, Tianjin 300350, China
2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300350, China
Abstract：In this paper, spectral diagnosis incorporated with high-speed imaging technology was employed to research arc characteristic of a new proposed process of TIG welding filled with flux-cored wire. The droplet transfer modes were studied by observing the high-speed images. The spectral information was acquired by scanning the spatial points of the arc for marking some elements and the active elements K and Na of the powder were tracked to determine the distribution of the powder composition, and calculating the temperature distribution of the arc by Boltzmann plot method. The arc temperature distribution was analyzed in different droplet transfer modes. The results showed that three typical droplet transfer modes of TIG welding filled by flux-cored wire were obtained: droplet transition (2 mm), slag column transition (5 mm) and bridging transition (7 mm) by adjusting the horizontal distance between wire and tungsten electrode tip. The active elements such as K, Na of the powder were in the arc space above molten pool, and their distribution was affected by the horizontal distance between wire and tungsten electrode tip. The smaller distance means the closer distribution of active elements to tungsten, which leads to the tungsten electrode was polluted. The arc temperature distribution of no filler wire TIG welding was bell-shaped, and the isotherm was approximately symmetrical about the tungsten axis. Compared with no filler wire TIG welding, the distortion of arc temperature distribution was influenced by different droplet transfer modes. The temperature distribution severely distorted under droplet transfer mode accompanied with more spatters during welding. In terms of the droplet transfer mode, smaller distortion of temperature distribution and stable welding process occur in slag column transition and bridging transition which are suitable for the proposed TIG welding process.
刘 莹，杨立军，何天玺，翟勇磊，刘 桐. 药芯焊丝TIG焊电弧特性的光谱分析[J]. 光谱学与光谱分析, 2017, 37(07): 2171-2176.
LIU Ying, YANG Li-jun, HE Tian-xi, ZHAI Yong-lei, LIU Tong. The Spectral Analysis of TIG Welding Filled with Flux-Cored Wire. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2017, 37(07): 2171-2176.
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