Journal
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
Volume 26, Issue 8, Pages 599-605Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/13621718.2021.1982341
Keywords
Friction stir welding; dissimilar materials; aluminium alloys; weld thinning; microstructure; mechanical properties
Funding
- Heilongjiang Provincial Postdoctoral Science Foundation [LBH-Z20055]
- Natural Science Foundation of Heilongjiang Province [JJ2020JQ085]
- National Natural Science Foundation of China [52175301, 52001099]
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A new stepped-shoulder friction stir welding tool was proposed for joining AA2195-T8 Al-Cu-Li and AA2219-T6 Al-Cu alloys, producing a sound joint with a weld thinning of 0.05 mm. The interface between the materials was free of cavities and kissing bond, with a tensile strength reaching 352 MPa, equal to 81.7% of the base AA2219-T6 alloys.
A stepped-shoulder friction stir welding tool containing a protruding inner shoulder and an outer shoulder was proposed to join AA2195-T8 Al-Cu-Li and AA2219-T6 Al-Cu alloys. The inner shoulder with a considerable plunge depth enhanced forging effect, and the outer shoulder with a low plunge depth prevented plasticized materials from overflowing out of welds, while the pin with milling facet promoted material flow. The sound joint with a weld thinning of 0.05 mm (about 0.8% of the workpiece) was obtained. The interface between the two materials was free of cavities and kissing bond. The joint fractured in thermo-mechanically affected zone on the side of AA2219-T6 alloy. The tensile strength reached 352 MPa, equal to 81.7% of base AA2219-T6 alloys.
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