Study on Microwave Detection System of Hot Melt Weld Defects in Polyethylene Gas-fired Pipeline
Aiming to identify defects in the hot melt welding of polyethylene gas-fired pipelines,non-destructive testing was conducted using microwave technology.The defects in the hot melt weld will result in a change to the crystal structure of the polymer polyethylene material,which will subsequently affect the dielectric constant.The amplitude and phase changes of the reflected microwave waves,which are caused by the change in dielectric constant of the material,are deduced theoretically based on the principle of microwave reflection in polyethylene pipelines.By measuring the amplitude and phase changes,it is possible to identify the location and depth of defects.A microwave nondestructive testing system was constructed and utilized to perform circumferential and axial tests on hot melt welds excavated from the field with defects.The digital ray test was employed to validate the microwave detection.The results demonstrated that microwave nondestructive testing exhibited remarkable capabilities for the detection of defects in hot melt joints.
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