Coupling and focusing ultrasonic detection method and detection device for polyethylene pipe hot melt butt joint
A technology of hot-melt butt jointing and focused ultrasound, which is applied in measuring devices, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, and using sound waves/ultrasonic waves/infrasonic waves for material analysis, etc. Problems such as contour echo are generated 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: first smooth the cross-sectional end face of the polyethylene pipe or pipe fitting, and then use a heating plate with a certain pressure to heat the connection part to a molten state; then remove it. Heat the plate and apply pressure to force the two molten end faces together, and finally connect and fix the two parts under steady pressure until the joint cools. The shape of one side of the joint after hot-melt butt welding is shown in Figure 1; in the area between the two pipes 1, there are upper and lower curling edges 2 and a fusion zone 3.
[0057] In the process of 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 polyethylene pipeline hot-melt joints. This is mainly based on the acoustic characteristics of polyethylene materials a...
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