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 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。
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