侧向风场作用下横向焊接旋转电弧传感及焊缝跟踪
Effects of lateral wind on the rotating arc sensing and the weld seam tracking in a horizontal welding process
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摘要: 文中利用侧向风场的吹袭作用来抑制横焊熔池的下淌，研究了在侧向风场作用下焊缝成形质量和旋转电弧的传感特性. 提出了一种基于平面拟合的焊枪偏差和电极高度检测算法，实现了同一电流信号下焊枪偏差和电极高度的同时检测. 结果表明，适当控制侧风流量有助于抑制熔池下淌、改善焊缝成形. 但是随着风速的增加，焊接电弧的熄弧率升高、电弧传感的准确性降低. 针对焊接电流的噪声干扰，还设计了软阈值小波滤波算法，并开发了相应的模糊控制算法对焊枪偏差和电极高度进行调节，初步实现了横焊焊缝的成形控制和跟踪.Abstract: The lateral wind was adopted in this paper to reduce the molten pool dropping during horizontal welding process, and the welding seam forming and rotating arc sensing characteristics under the influence of the lateral wind were studied. A plane fitting method was developed to detect the welding seam deviation and the electrode contact tip-to-workpiece distance (CTWD) based on the welding current signals. The experimental results showed that the molten pool dropping would be reduced by controlling the lateral wind speed appropriately. However, with the increasing of lateral wind speed, the stability of the arc and the accuracy of the sensing decreased. A soft threshold wavelet filtering method was designed to reduce the noise interference, and a fuzzy controlling method was developed to adjust the height of welding torch and control it to track the weld seam. The horizontal weld seam forming and tracking were primarily realized through the developed method.
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Keywords:
- horizontal welding /
- lateral wind filed /
- arc sensing /
- weld seam tracking
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