The molten observation hole needle (3) is arranged on the pipe fitting body so that a welding progress can be conveniently detected, and the welding quality can be controlled.
焊接熔观察孔针(3)设置在管件本体上，方便检测焊接进程，控制焊接质量。
The local branch of Ivy tech, a community college, agreed to create a three-week welding course to teach the specialised techniques Progress Rail USES.
一所社区大学，也是当地的常青藤科技分院同意针对Progress Rail所需的专业技术，开设为期三周的焊工课程。
The welding technology in our country has made a great progress, and our country becomes the largest welding material consumption country in the world.
我国焊接生产技术有了巨大的进步，已经成为世界最大的焊接材料消耗国。
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