Is PTH and small via hole wall quality checked by cross-section and followed by a closed loop corrective action?

是否通过切片检验pth与小导通孔孔壁状况，并有相应的改善对策跟踪？

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Using a 1/16" drill bit, drill a hole in the middle of the cross section tube above. This will allow gas to escape during welding."

使用1 / 16“钻头，钻一个孔在上面管中间的横截面。这将使天然气逃脱焊接过程。

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The presence of primary hole air flows remarkably squeezes the recirculation zone, resulting in a elliptic-like cross section, with the long axis is longer than the short one up to 1.6 times.

发现真实结构燃烧室内的回流区不再是轴对称，主燃孔和二次气流的存在使回流区明显被压扁（最扁处的长轴约为短轴的1.6倍）；

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