Visual Sensing of the Physical Process During Underwater Wet
Visual Sensing of the Physical Process During Underwater Wet
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发表时间：
2016
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通讯作者：
Y. Zhang;B. Zhao;H. J.K.;WU C.S.
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作者：
Y. Zhang;B. Zhao;H. J.K.;WU C.S.
对水下湿式药芯焊丝电弧焊（FCAW）的物理过程进行了视觉感知和研究。开发了一种图像采集系统，通过避免恶劣的水环境的严重干扰，监测气泡，液滴和电弧的行为。根据气泡的瞬态图像描述和解释了气泡演化的复杂动力学行为。获得的液滴清晰图像显示了典型的金属转移模式，即，大滴径、低滴频的排斥性球状过渡。随后对焊接电弧的特性进行了分析，发现焊接电弧受到水环境的压缩，在阴极点处有特别强烈的漂移和偏移行为。揭示了电弧电位梯度和电流密度高的现象，并给出了可能的原因。最后，不均匀和不对称的焊接接头外观可能是由于水下焊接的特殊工艺，特别是不稳定的熔滴过渡。C. B。JIA（jiachuanbao@sdu.edu.cn），Y. Zhang，B.赵俊凯HU和C.S.山东大学材料液-固结构演化与加工教育部重点实验室，济南。中国
The physical process of underwater wet flux cored arc welding (FCAW) was visually sensed and investigated. An image capture system was developed to monitor the bubbles, droplets, and arc behaviors via avoiding the serious disturbances from the harsh water environment. The complex dynamic behaviors of the bubbles’ evolution were de scribed and explained according to their transient images. The acquired clear images of droplets showed the typical metal transfer mode, i.e., the repelled globular transfer with large droplet size and low transfer frequency. Subsequently, the welding arc characteris tics were examined, revealing it was compressed by the water environment and had spe cial intensive drifting and deviation behaviors on the cathode spot. High electric poten tial gradient and current density of the arc were disclosed and possible reasons were given. Finally, the uneven and asymmetric weld joint appearance was probably caused by the special welding process under water, especially the unstable droplet transfer. C. B. JIA (jiachuanbao@sdu.edu.cn), Y. ZHANG, B. ZHAO, J. K. HU, and C.S. WU are with the Key Laboratory for LiquidSolid Structural Evolu tion and Processing of Materials Ministry of Education, Shandong University, Jinan, P.R. China.