本文设计了一套应用于镀锌板激光填充粉末焊接的喷嘴，并利用纹影仪等手段研究了该喷嘴的最佳保护气流量和最佳粉末束拘束度参数；
This paper designs a new kind of nozzle used for laser welding of zinc-coated steels with metal powder and studies the better modality of shielding gas and the powder beam with schlieren device.
阴影一旦消失，余下的光就变成了另一束光的影。
The shadow fades and is no more, the light that lingers becomes a shadows to another light.
实验结果表明，研究提出的散射校正方法能有效减少基于平板探测器的锥束CT 系统散射伪影，提高了重建切片图像的质量。
The result showed that the method can effectively reduce the scatter artifacts and increase the quality of the reconstructed slice image.
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