A methodology for voltage drop determination in GMA welding: arcs with short-circuiting metal transfer
A methodology for voltage drop determination in GMA welding: arcs with short-circuiting metal transfer
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GMA 焊接中压降测定方法：具有短路金属过渡的电弧
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
A. V. Costa
中科院分区：
文献类型：
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作者：
A. Scotti;V. Ponomarev;A. V. Costa
本工作的主要目标是开发确定气体保护焊(GMAW)中焊接电弧能量结构的方法，即熔滴过渡。本文着重介绍了一种适用于短路转移的方法。这种方法基于方程，这些方程通过测量焊接电流、电弧电压、弧长和电极+熔滴长度来计算离散的瞬时值。在高速摄像机的辅助下，使用激光扫描技术获得金属转移图像。开发了专门的计算程序来量化电学和几何值。电信号和熔滴过渡图像之间的同步使在示波图的任何点上测量的总电弧电压与电弧和电极+液滴的几何参数相关联成为可能。用Ar基混合气体保护的不锈钢GMAW和N_2含量为1~5%的气体保护对该方法进行了验证。结果表明，该方法足够敏感，可以感知到由于使用不同的屏蔽混合物而导致的组成总电弧电压的电压降的微小变化。
The main goal of this work was the development of methodologies for determining the energetic structure of welding arcs in Gas Metal Arc Welding (GMAW), i.e., with metal transfer. The present article focuses on a methodology applied to short-circuiting transfer. This methodology is based on equations which operate with discrete instantaneous values from measurements of welding current, arc voltage, arc length and electrode + droplet length. Metal transfer images were obtained through the use of laser shad-owgraphy aided by high-speed camera. Dedicate computational programs were developed for electrical and geometrical values quantifications. Synchronization between the electrical signals and the metal transfer images made possible to associate total arc voltage measured at any point of oscillograms to the arc and electrode + droplet geometrical parameters. The proposed methodology was validated by using stainless steel GMAW shielded with Ar based blends and N 2 contents ranging from 1 to 5%. The results showed that the methodology is sensitive enough for perceiving small variations in the voltage drops that compose the total arc voltage as a consequence of using different shielding blends.