Leakage indicating gas collecting device for helium mass spectrum leakage detection of conduit circumferential weld and using method of leakage indicating gas collecting device

The invention provides a leakage indicating gas collecting device for conduit circumferential weld helium mass spectrum leakage detection and a using method. The leakage indicating gas collecting device comprises a first shell, a second shell and a hinge. The first shell is rotationally connected with the second shell through the hinge, and the first shell and the second shell are fixed to the circumferential side of a weld joint of a guide pipe with the weld joint through a spring bolt and a boss. And the first shell and/or the second shell are/is provided with a test window. According to the utility model, a plurality of test windows are arranged to facilitate the detection of a probe of a helium mass spectrometer leak detector, the detection position of the probe is greatly limited by a leak detection opening of a traditional metal leak detection tool, and the device is made of a plastic resin material and is provided with a plurality of test windows, so that the probe is allowed to penetrate into the devi