Analysis of loads, temperatures and welds morphology in FSW of polycarbonate

Lambiase, F.; Paoletti, A.; Grossi, V.; Ilio, A. Di

doi:10.1016/j.jmatprotec.2018.11.043

Cited by 36 publications

(15 citation statements)

References 22 publications

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“…The shorter the time for plasticizing and stirring the materials is, the more the inertia of the joining partners promotes the formation of defects in the weld. Moreover, as shown by two publications from Lambiase et al [25,26], the heat exchange mechanisms during the friction stir welding process need to be considered. The authors have found that the heat dissipation into the clamping device and the preheating of material in front of the welding tool vary depending on the traverse speed and the tool rotation speed.…”

Section: Metallographic Analysis Of the Al-cu Friction Stir Welds Andmentioning

confidence: 99%

Optimization of Process Parameters for Friction Stir Welding of Aluminum and Copper Using the Taguchi Method

Eslami

Hischer

Harms

et al. 2019

Metals

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Producing joints of aluminum and copper by means of fusion welding is a challenging task. However, the results of various studies have proven the potential of friction stir welding (FSW) for manufacturing aluminum-copper joints. Despite the proven feasibility, there is currently no series application in automotive industry to produce aluminum-copper joints for electrical contacts by means of FSW. To make FSW as efficient as possible for large-scale production, maximized welding speed is desired. Taking this into account, this paper presents results of a parametric investigation, the objective of which was to increase the welding speed for FSW of aluminum and copper in comparison to welding speeds that are considered to be state of the art. Taguchi method was used to design an experimental plan and target figures of the investigations were the resultant tensile strengths and electrical resistances. Dependencies between input parameters and target figures were determined systematically. The optimal welding parameters, at which joints failed in the weaker aluminum material, included a welding speed of 700 mm/min. Consequently, it could be shown that joints with a performance similar to those of the base materials can be obtained using significantly higher welding speeds than reported in the relevant literature.

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Section: Metallographic Analysis Of the Al-cu Friction Stir Welds Andmentioning

confidence: 99%

Optimization of Process Parameters for Friction Stir Welding of Aluminum and Copper Using the Taguchi Method

Eslami

Hischer

Harms

et al. 2019

Metals

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show abstract

“…Friction stir welding (FSW) has been extensively utilized to weld various aluminum alloys since its invention in 1991 [1]. Due to the advantages over traditional fusion joining techniques, such as the lack of melting, low defect and low distortion, FSW has been widely applied in the aerospace, automobile and railway industries [2,3]. It uses the high-speed rotating tool to generate heat by friction on the workpiece to promote the plastic flow of the material and realize weld formation under the forging action of the shoulder [4,5].…”

Section: Introductionmentioning

confidence: 99%

Temperature Monitoring and Material Flow Characteristics of Friction Stir Welded 2A14-t6 Aerospace Aluminum Alloy

et al. 2019

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Aiming at the problems that the temperature in the welding area of friction stir welding (FSW) is difficult to measure and the joints are prone to defects. Hence, it is particularly important to study the material flow in the welding area and improve the welding quality. The temperature of the tool shoulder and the tool pin was monitored by the wireless temperature measuring system. The finite element model of friction stir welding was established and the welding conditions were numerically simulated. The flow law of material of the friction stir welding process was studied by numerical simulation. The material flow model was established by combining the microstructure analysis results, and the forming mechanism of the defects was analyzed. The results show that the temperature in the welding zone is the highest at 1300 rpm, and the temperature at the tool shoulder is significantly higher than that at the tool pin in the welding stage. When high-rotation speeds (HRS) are chosen, the material beneath the tool shoulder tends to be extruded into the pin stirred zone (PSZ) after flowing back to the advancing side. This will cause turbulence phenomenon in the advancing side of the joint, which will easily lead to the formation of welding defects. In the future, temperature monitoring methods and the flow model of material can be used to optimize the welding parameters.

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“…21 The effect of plunging force in FSSW has been reported in case of thermoplastics. 22,23 Circular pattern was observed in the welding zone at low joining speed and low rotational speed that are due to low pressure of tool, whereas at higher welding speed, more flash was observed due to high welding temperature. 23 Some studies outlined the decrease in mechanical strength at low temperature mainly due to insufficient softening of polymers while FSSW.…”

Section: Introductionmentioning

confidence: 98%

“…22,23 Circular pattern was observed in the welding zone at low joining speed and low rotational speed that are due to low pressure of tool, whereas at higher welding speed, more flash was observed due to high welding temperature. 23 Some studies outlined the decrease in mechanical strength at low temperature mainly due to insufficient softening of polymers while FSSW. 22 –24 However, good strength was observed at higher rotational speed but excess rotation removes the material from the joint.…”

Section: Introductionmentioning

confidence: 98%

PLA-PEKK-HAp-CS composite scaffold joining with friction stir spot welding

Singh

Kumar

et al. 2019

Journal of Thermoplastic Composite Materials

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This article reports joining feasibility of polylactic acid-polyether ketone ketone-hydroxyapatite-chitosan composite scaffold with consumable tool in friction stir spot welding (FSSW) as a novel process. Also, investigations have been made for mechanical, thermal, and morphological characteristics of the joints prepared. The results for joint strength are supported with axial/transverse force and interface temperature measurement for bone scaffolds. The FSSW process parameters, namely rotational speed, pin depth, and stirred time, have been varied to correlate the changes in force and temperature with mechanical and morphological properties. The results of the study highlighted that ultimate tensile strength (6.57 MPa) and flexural strength (139.2 MPa) were obtained best at 800 r/min rotational speed and 20 s stirring time with 2.5-mm pin depth.

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Analysis of loads, temperatures and welds morphology in FSW of polycarbonate

Cited by 36 publications

References 22 publications

Optimization of Process Parameters for Friction Stir Welding of Aluminum and Copper Using the Taguchi Method

Optimization of Process Parameters for Friction Stir Welding of Aluminum and Copper Using the Taguchi Method

Temperature Monitoring and Material Flow Characteristics of Friction Stir Welded 2A14-t6 Aerospace Aluminum Alloy

PLA-PEKK-HAp-CS composite scaffold joining with friction stir spot welding

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