Influences of TPU Content on the Weld Line Characteristics of PP and ABS Blends

Do, Thanh Trung; Nguyen, Van-Thuc; Song Toan, Huynh Do; Minh, Pham Son; Uyen, Tran Minh The; Huynh, Trung H.; Nguyen, Vinh Tien; Nguyen, Van Thanh Tien

doi:10.3390/polym15102321

Cited by 3 publications

(2 citation statements)

References 32 publications

(51 reference statements)

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“…1 Thermoplastic resins may be effectively melted and joined together, and the thermoplastic engineering materials well behave under impact loads. 2 Extensive research studies have been conducted by researchers on the injection molding process of resin materials, focusing on the formation of weld lines during the molding process, 3 strength of the molded parts, and their service life. 4 However, a single molding process is insufficient owing to as the inevitable need to connect different components arises.…”

Section: Introductionmentioning

confidence: 99%

High strength injection molding welding and interface crystal phase changes in polyamide 6

Qiu

Zhang³

et al. 2023

Polymer Engineering & Sci

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Injection molding is a widely used method for production of plastic components, offering both simplicity and high strength. In this study, secondary injection molding was utilized to weld polyamide 6 (PA6). The welded samples were evaluated for the welding strength via a shear tensile test. Three process parameters of mold temperature, injection temperature, and injection speed were varied to determine the optimal conditions for welding. A polarizing microscope analysis of the welding interface revealed formation of a shish kebab layer (SKL) structure, which significantly contributed to the welding strength. A differential scanning calorimetry analysis of the welded samples showed that changes in the crystallinity at the interface were closely related to the welding strength under different injection molding conditions. To analyze the crystal phase of the interface after welding, we propose the use of Fourier‐transform infrared spectroscopy area scanning to obtain the relationship between the phase transformation and welding strength. Additionally, microhardness testing is proposed as a means of evaluation of the welding effect. Overall, this study highlights the importance of optimization of process parameters in secondary injection molding to achieve strong welds in PA6, where the SKL structure and crystallinity changes at the interface have crucial roles.Highlights The high welding shear strength reaches 80% of the base material. The interfacial crystalline structure has a significant impact on the strength. The crystalline changes were analyzed using FTIR region scanning. The relationship between microhardness and welding strength was obtained. The wide‐ranging conditions have reference value for industrial production.

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Section: Introductionmentioning

confidence: 99%

High strength injection molding welding and interface crystal phase changes in polyamide 6

Qiu

Zhang³

et al. 2023

Polymer Engineering & Sci

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“…Mechanical properties in the welding region can be changed by the selected welding technologies, especially when dissimilar materials are involved [21][22][23][24][25]. The mechanical properties, mainly yield strength and tensile strength, generally decrease due to precipitate dissolutions in FSW of aluminum alloys [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Subregion Based Prediction of Residual States in Friction Stir Welding of Dissimilar Metals

Zhang,

Wang,

Liu

et al. 2023

Coatings

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Mechanical property changes in friction stir welding can directly affect the rebalance of the stress field in friction stir welding. This means that it reveals a high relevance with the residual states of friction stir welding. Here, we propose a subregion model in which the mechanical property changes are considered to predict the residual states in friction stir welding of dissimilar metals. Results indicate that the accuracy of the predicted distortion can be greatly increased when the different mechanical properties are considered in friction stir welding of 2024-T3 and 6061-T6. The final mechanical property is determined by the mixture of the materials at retreating and advancing sides. The final mechanical property in the stirring zone can be increased to 171 MPa for yield strength and 194 MPa for tensile strength when the strength of the advancing side material is higher. The shrinkage of material in the stirring zone during the cooling stage is the key reason for the formation of the tensile residual stress and the V-shape distortion on the cross-section in the as-weld state.

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Weld‐lines and its strength evaluation in injection molded parts: A review

Jadhav,

Gaval,

Solanke

et al. 2023

Polymer Engineering & Sci

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Injection molding manufacturing is immensely popular nowadays because of its excellent manufacturability for complex designs produced from a wide range of different engineering plastic materials. Weld‐line is a defect that arises in injection molding when two or more flow fronts collide. The weld‐lines are undesirable from both aesthetic and functional points of view and their effect is different for varied materials, process conditions, loadings, forms of weld‐line, etc. The presence of a weld‐line weakens components locally due to insufficient intermolecular diffusion, v‐notch formation, fiber anisotropy, insufficient process conditions, and so on. When a component is under load, crack propagation usually begins with a weak weld‐line area. Therefore, the designer should anticipate the presence of weld‐lines and their strength to avoid failure of components during operation. In this article, the review of published research work on weld‐line formation during injection molding has been summarized. The review focuses on the phenomenon of weld‐line formation, the type of weld‐lines, and the importance of weld‐line evaluations. The theoretical, experimental, and computational approaches to analyzing weld‐line and its strength are covered in detail. At last, methods for reducing weld‐lines and increasing the strength of weld‐line area have been discussed. This review also gathers data on weld‐line strength with respect to different materials.Highlights Details of weld‐line formation and its types. Importance of weld‐line evaluation. Methods of weld‐line strength evaluation. Methods of reduction of the number of weld‐line and its effect. Summary of weld‐line strength for different material.

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Influences of TPU Content on the Weld Line Characteristics of PP and ABS Blends

Cited by 3 publications

References 32 publications

High strength injection molding welding and interface crystal phase changes in polyamide 6

High strength injection molding welding and interface crystal phase changes in polyamide 6

Subregion Based Prediction of Residual States in Friction Stir Welding of Dissimilar Metals

Weld‐lines and its strength evaluation in injection molded parts: A review

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