Resistance Spot Welding of Ti/steel with Nb/Cupronickel Composite Interlayer
QI Hao
WANG Nannan
ZHAO Peifeng
SHI Hongxin
SATONAKA Shinobu
Abstract：To mitigate the formation of brittle Ti-Fe intermetallic compounds,resistance spot welding of 2 mm thick titanium and 1 mm thick Q235 low-carbon steel was conducted using a 0.1 mm thick composite interlayer consisting of niobium and C7701 white copper foil.The effects of welding current and welding time on nugget diameter and mechanical properties of the joints were investigated,along with microstructural analysis.Results indicated that when nuggets were separated on both sides,a layer comprising FeNb intermetallic compounds and(Nb)solid solution formed between the steel-side nugget and the residual Nb layer.In contrast,a single mixed nugget consisting of TiFe and α-Ti was observed when the joint nugget was unified.With increasing welding current and duration,the nugget diameter expanded,while the shear load first increased and then decreased.The maximum shear load,approximately 7.995 kN,was obtained at 7 kA and 300 ms.
Keywords：Tilow-carbon steelcomposite intermediate layermicrostructureresistance spot welding
Publication Date：2025-12-25
Online Publishing Date：2026-01-05(First online date of this platform, not the publication date of the document)
Pages：11( 27-37 )