Analysis of Effect of Pressure and Heat on Mechanical Characteristics of Butt Fusion Welding of Polyethylene Pipes

Riahi, Mohammad Ali; Kooshayan, Khalil; Ghanati, Mohammad Faraji

doi:10.1080/03602559.2011.551982

Cited by 21 publications

(16 citation statements)

References 11 publications

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“…These articles can be treated as a sort of database for High-Density Polyethylene welding using the pressure-controlled method. Riahi [ 20 ] conducted research on plasticization polyethylene using analytical and numerical methods. He tried to find a correlation between the strength of the joint and the welding time or hot plate temperature.…”

Section: Introductionmentioning

confidence: 99%

Designing of the Electromechanical Drive for Automated Hot Plate Welder Using Load Optimization with Genetic Algorithm

2022

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Drive and conveyor belts are widely used in the mining and processing industry. One of the types often used is the belt with a cross-section and a diameter of several millimeters, made of weldable thermoplastic elastomer. Their production process requires the joining of the ends to obtain a closed loop. This operation is often performed by butt welding using the hot plate method. Taking into account the industrial requirements, the authors made an effort to design the automated welding machine for this type of belt. The work that had been conducted was finished with the implementation of the device for serial belt production. One of the stages of the design process of the welding machine consisted of developing a solution for the electromechanical drive system. The paper presents a design and the selection of the key components of the drive system, in particular, the electrical executive elements. Firstly, on the basis of the functional requirements of individual working mechanisms, the kinematic structure of the drives was developed, and the influence of the workload on power consumption was described. Then, using known technological parameters, experimental research of the plasticization operation was performed. On the basis of the results obtained, a mathematical model of the correlation between the plasticization force and technological parameters was derived. Using the derived model, the optimization of the technological parameters was made by using a genetic algorithm. The work led to the choice of an effective electric motor, which is the main component of the designed drive system.

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Section: Introductionmentioning

confidence: 99%

Designing of the Electromechanical Drive for Automated Hot Plate Welder Using Load Optimization with Genetic Algorithm

2022

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“…Finally, the butt fusion joint is cooled to an ambient temperature under pressure. The performance of butt fusion joints is mainly affected by certain welding parameters, such as temperature [ 4 , 5 ], pressure [ 6 , 7 ], and heating time [ 8 ]. In addition, axial misalignment of the joint can reduce the service life of butt fusion joints [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Welding Defects on the Long-Term Performance of HDPE Pipes

2022

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High-density polyethylene (HDPE) pipes are the preferred pipes of water systems in nuclear power plants because they are durable, corrosion-free, easy to install, and not subject to fouling. However, their long-term performance can be affected by welding defects. In this paper, the effect of welding defects on the long-term performance of HDPE pipe butt fusion joints was studied using a creep test. A welding defect with a hole or inclusion in the joint was simulated by artificially inserting a copper ball during butt fusion welding. The test results showed that the creep life of the joint decreased with increased defect size. An expression describing the creep life and the defect ratio was obtained according to the test results. In addition, the test results showed that the creep life of the joint without a welding bead was about 50% of that in a joint with a welding bead.

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“…Despite the many research works that have been conducted so far, the proposed method of assessing the strength of the weld, based on deformation analysis, is not popular. Researchers typically evaluate the quality of the weld based on the maximum force or stress carried by the weld [ 26 , 27 , 28 , 29 , 30 ], additionally determining the coefficient of the relative weld strength [ 31 ]. This is due to the fact that research has usually been undertaken on the welding of relatively rigid plastics, for which the breaking load is of relatively high value and the maximum deformation during a static tensile test does not exceed a few tens of percent.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Polyurethane Drive Belts with Different Cross-Section Using Thermomechanical Tests for Modeling the Hot Plate Welding Process

et al. 2021

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The paper presents a comparative analysis of the circular and flat cross-section belts using measurements of a set of thermomechanical parameters, contributing to research about hot plate welding of drive belts. On the basis of thermogravimetric and spectrophotometric tests, information about the same chemical composition of the two belts was obtained. Dynamic thermomechanical analysis and scanning differential calorimetry provided information about a small difference between belts, which disappeared when the material was placed in a state of increased temperature and mechanical stress. On the basis of the analysis of the specific heat, thermal diffusion, density, and hardness, the values of the selected thermal properties of the belt were obtained, and a large similarity between the belts was identified. On the basis of the novel performed test cycle, it has been hypothesized that circular and flat belts made from thermoplastic polyurethane elastomer could be used interchangeably for butt-welding testing. It has also been proven that cyclic thermomechanical loads unify the properties of both materials so that multiple mechanical and thermal loads do not result in any change in the material properties of the two belts. As a consequence, changes in the weld properties after welding, compared to a solid belt, are not expected.

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Analysis of Effect of Pressure and Heat on Mechanical Characteristics of Butt Fusion Welding of Polyethylene Pipes

Cited by 21 publications

References 11 publications

Designing of the Electromechanical Drive for Automated Hot Plate Welder Using Load Optimization with Genetic Algorithm

Designing of the Electromechanical Drive for Automated Hot Plate Welder Using Load Optimization with Genetic Algorithm

The Effect of Welding Defects on the Long-Term Performance of HDPE Pipes

Comparative Analysis of Polyurethane Drive Belts with Different Cross-Section Using Thermomechanical Tests for Modeling the Hot Plate Welding Process

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