Journal
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
Volume 27, Issue 6, Pages 418-428Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/13621718.2022.2061692
Keywords
dissimilar welding; friction welding; shape memory alloy; steel reinforcing bars; force control; intermetallic layer; tensile strength
Funding
- Fonds De La Recherche Scientifique -FNRS [F.4501.21]
- Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture FRIA
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Integration of NiTi superelastic bars with steel reinforcing bars is a promising method to enhance the seismic performance of reinforced concrete structures. Friction welding is investigated as a possible technique for joining NiTi alloy and steel, with attention paid to keeping the intermetallic layer thin and limiting cracks in the steel layer next to the interface.
Integration of NiTi superelastic bars with steel reinforcing bars is a promising path for increasing the seismic performance of reinforced concrete structures. Welding of NiTi alloy to steel is however not straightforward with standard welding techniques. Friction welding is investigated for performing this dissimilar junction using both regular friction (forced controlled) and milling (position-controlled) machines. When adequate shortenings and forging forces are selected, the welds can withstand the tensile strength of the steel rebars. Failure actually occurs in the heat-affected zone of the steel bars. The intermetallic (IM) layer at the welded interface should be kept thin and cracks should be limited in the steel layer next to the interface in order to avoid early brittle interfacial cracking.
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