In the process of hot-melt welding of PE pipe, it is necessary to comprehensively control its quality, carry out management work for operators, mechanical equipment, welding materials and welding process, rely on the test work, and strive to reduce welding cracks and cracks. At present, China’s construction enterprises have been in hot melt welding

Start to apply ultrasonic testing technology to carry out relevant testing work, which can timely find the welding quality problems inside PE pipes, take effective measures to carry out quality control before and during welding, and control the construction quality by inspection after welding.

1) Quality control measures before welding.

Before welding, it is necessary to do a good job in quality control, which can improve the work quality. Firstly, for welding operators, their professional quality and skills need to be strictly controlled, and they are required to have welding qualification certificates. At the same time, it is necessary to formulate a perfect quality management planning scheme and build a high-quality enterprise according to its actual development needs

Quality talent team, so as to improve the construction quality. For welding raw materials, relevant national quality requirements shall be met. Secondly, in the process of selecting welding equipment, it is necessary to actively apply the full-automatic electric welding machine to make it have the functions of automatic compensation, automatic heating and pressurization, automatic display of welding data information, automatic inspection and self-monitoring

Automatic detection, automatic alarm and other functions to support the development of welding work. Thirdly, it is necessary to scientifically select the welding process and evaluate it. At the same time, it is necessary to ensure that the melt quality meets the relevant regulations and no quality problems are allowed. Finally, for welding process parameters, it is necessary to do a good job of evaluation and control their temperature parameters

The preparation temperature is within 230 ℃, so as to improve its working quality. At the same time, the quality of pipes and fittings shall be comprehensively checked. After the quality meets the relevant requirements, the welding interface shall be prepared, the cleaning treatment shall be done, and the oxide layer shall be scraped off.

2) Quality control measures during welding.

In the actual welding work, it is necessary to do a good job in quality management, reduce misoperation and gradually optimize its working system. First, the temperature of the welding machine needs to be controlled at about 210 ℃ to facilitate welding. In addition, in windy or rainy and snowy weather, it is not conducive to welding work and avoid excessive temperature

Low phenomenon. Second, construction technicians need to operate in strict accordance with relevant regulations to ensure the accuracy of work data information. Third, the forming allowance of the fixture should be controlled above 21mm, and the operation speed and temperature should be controlled scientifically to avoid welding defects. Fourth, the welding joint needs to be cooled under stable pressure (natural air cooling). It cannot be moved or added pressure. Fifth, during welding, it is necessary to ensure that the surface of the heating plate is always clean.

3) Quality control measures after welding.

After completing the welding work, the construction enterprise needs to conduct all inspection on the appearance of the welding parts, and use the cutting inspection method (the notch sampling inspection is up to 5%) to find the problems existing in the welding work in time. At the same time, technicians need to carry out pressure test and combine random inspection with comprehensive inspection, such as tensile capacity.

In the measurement and random inspection, once quality problems are found, a comprehensive inspection shall be used to determine whether there are problems at all welding parts.