Effect of Welding Sequence on Mechanical Properties and Microstructure of Cross-Welded Joints Fabricated by FSW and TIG Welding Methods with 6061-T6 Aluminum Alloy Sheets
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초록
The cross-welded joints for 6061-T6 aluminum alloy sheets were successfully manufactured through friction stir welding(FSW) and tungsten inert gas(TIG) welding methods to reveal the effect of welding sequence on microstructure and mechanical properties of the joints. Results revealed that FSW-ED joint shows maximum joint strength compare to other combinations. Interestingly, TIG-FSW joint shows much higher tensile strength than FSW-TIG joint. It is seen that the average hardness in SZ of friction-stir-welded specimen is comparatively higher than that of TIG-FSW and FSW-TIG joints. TIG-FSW specimen also shows higher hardness compare to FSW-TIG. Through FE-SEM observation for tensile fracture surface, various size of dimples clearly observed indicating ductile type of failure mode in all specimens. In case of FSW-TIG process, several voids were observed at the surface region of weld pool. On the contrary, no as such void formation has been observed in TIG-FSW process. The micro hardness and microstructural results clearly justify the higher tensile strength in TIG-FSW process.
Abstract
The cross-welded joints for 6061-T6 aluminum alloy sheets were successfully manufactured through friction stir welding(FSW) and tungsten inert gas(TIG) welding methods to reveal the effect of welding sequence on microstructure and mechanical properties of the joints. Results revealed that FSW-ED joint shows maximum joint strength compare to other combinations. Interestingly, TIG-FSW joint shows much higher tensile strength than FSW-TIG joint. It is seen that the average hardness in SZ of friction-stir-welded specimen is comparatively higher than that of TIG-FSW and FSW-TIG joints. TIG-FSW specimen also shows higher hardness compare to FSW-TIG. Through FE-SEM observation for tensile fracture surface, various size of dimples clearly observed indicating ductile type of failure mode in all specimens. In case of FSW-TIG process, several voids were observed at the surface region of weld pool. On the contrary, no as such void formation has been observed in TIG-FSW process. The micro hardness and microstructural results clearly justify the higher tensile strength in TIG-FSW process.
참고문헌 (10)
- J. Gilbert Kaufman, "Properties of Aluminum Alloys", ASM International, pp.162~198 (1999)
- The Japan Aluminum Association, "Aluminum", pp.18~34 (2007), Tanaka Seihon Insatsu Kabushiki Kaisya
- Akio Hirose, "CO2 laser beam welding of 6061- T6 aluminum alloy thin plate", Metallurgical and Materials Transactions A, 28, pp.2657~2662 (1997)
- Akio Hirose, "Quantitative evaluation of softened regions in weld heat-affectred zones of 6061-T6 aluminum alloy–Characterizing of the laser beam welding process", Metallurgical and Materials Transactions A, 30, pp.2115~2120 (1999)
- Ying Liang, "Effect of TIG current on microstructural and mechanical properties of 6061-T6 aluminum alloy joints by TIG-CMT hybrid welding", Journal of Materials Processing Technology, 225, pp.161~174 (2018)
- Yajie Wang, "HF pulse effect on microstructure and properties AC TIG butt-welded joint of 6061 Al alloy", Journal of Manufacturing Process A, 56, pp.878~886 (2020)
- Kaiyuan Wu, "Metal transfer of aluminum alloy double-wire pulsed GMAW with a median waveform", Journal of Materials Processing Technology, 286, pp.116761~ (2020), Elsevier BV[DOI]
- Daniela Lohwasser, "Friction Stir Welding from Basic to Applications", pp.15~38 (2010), Woodhead Publishing
- Yutaka S. Sato, "Microstructural evolution of 6063 aluminum during Friction stir welding", Metallurgical and Materials Transactions A, 30, pp.2429~2437 (1999)
- P. M. G. P. Moreira, "Fatigue behaviour of FSW and MIG weldments for two aluminum alloys", Theoretical and applied fracture mechanics, 48, pp.169~177 (2007)