Coupling and focusing ultrasonic detection method and detection device for polyethylene pipe hot melt butt joint
A technology of hot-melt butt joint and focused ultrasound, which is used in measurement devices, analysis of solids using sonic/ultrasonic/infrasonic waves, and material analysis using sonic/ultrasonic/infrasonic waves, etc. Generate contour echo and other problems to achieve the effect of improving detection sensitivity, improving detection sensitivity, and improving detection ability
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[0056] The specific process of the most commonly used hot-melt butt joint method for existing polyethylene pipes is: firstly, the cross-sectional end surface of the polyethylene pipe or pipe fitting is treated flat, and then the connection part is heated to a molten state with a heating plate with a certain pressure; The plate is heated and pressure is applied to forcefully press the two fused ends together, finally the two parts are joined and secured under steady pressure until the joint cools. The shape of one side of the joint after butt welding is as follows: figure 1 Shown; wherein there are upper and lower crimps 2 and a fusion zone 3 in the middle area of the two pipes 1 .
[0057] During the experimental research, it was found that the liquid immersion focusing technology, which is difficult to implement in metal welds, has unique advantages for ultrasonic testing of hot-melt joints of polyethylene pipes, which is mainly based on the acoustic characteristics of poly...
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