Microwave scanning detection method of polyethylene pipeline electric smelting joint

The invention relates to the field of detection of a pressure pipeline, in particular to a microwave scanning method of a polyethylene pipeline electric smelting joint, which comprises the steps of: detecting the polyethylene pipeline electric smelting joint by using a microwave scanning device, emitting microwaves to the joint to be detected by an emitter in a microwave probe, recording base line amplitudes by the microwaves through two receiving sensors, then penetrating through the surface of the joint to enter the inner part of the joint, when the travelling microwaves meet the defect, enabling the microwaves to generate reflection by the change of a dielectric constant; and generating interference by the reflected microwave signals and the emitted microwave signals, receiving by the receiving sensor and converting into a voltage signal, inputting to a computer after the voltage signal and scanning position information pass through a signal conversion system to obtain a scanning image, and obtaining relevant information of the defect in the electric smelting joint according to the scanning image. The detection method has the advantages of capability of detecting multiple types of defects, high detection sensitivity and precision, good reliability and the like, and can be especially used for effectively detecting process defects such as cold welding and the like, is convenient for operation, and has lower cost.