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。

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."

youdao

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。

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."

youdao