Non-weld-thinning friction stir welding

•Non-weld-thinning friction stir welding was proposed.•An adjustable tool with inner and outer shoulders was employed.•Smooth surface without weld thinning was achieved.•The theory of “single welding, double forming” was proposed.•The ultimate tensile strength reached 91% of base metal. Weld thinnin...

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Bibliographic Details
Published in:Materials letters 2019-11, Vol.255, p.126506, Article 126506
Main Authors: Guan, Meng, Wang, Yuhua, Huang, Yongxian, Liu, Xin, Meng, Xiangchen, Xie, Yuming, Li, Junchen
Format: Article
Language:English
Subjects:
Base metal
Friction stir welding
Joint integrity
Materials science
Mechanical properties
Metals and alloys
Non-weld-thinning
Overflow
Surface formation
Thinning
Ultimate tensile strength
Welding
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Summary:•Non-weld-thinning friction stir welding was proposed.•An adjustable tool with inner and outer shoulders was employed.•Smooth surface without weld thinning was achieved.•The theory of “single welding, double forming” was proposed.•The ultimate tensile strength reached 91% of base metal. Weld thinning has been an inherent issue of friction stir welding, which is detrimental to the joint integrity and mechanical properties especially for thin structures. In this paper, a novel method named non-weld-thinning friction stir welding was proposed. The welding tool contained an inner shoulder and an outer shoulder, and it was adjustable to control the protrusion of inner shoulder relative to outer shoulder. The outer shoulder could accumulate and refill the overflowing materials to eliminate weld thinning. The ultimate tensile strength reached 91% of base metal, which indicated that non-weld-thinning friction stir welding had the feasible and potential to realize high quality joint without weld thinning.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2019.126506