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Metals 2017, 7(10), 424;

Characteristics of Resistance Spot Welded Ti6Al4V Titanium Alloy Sheets

School of Mechanical Science and Engineering, Jilin University, Changchun 130025, China
College of Computer Science and Technology, Jilin University, Changchun 130012, China
Author to whom correspondence should be addressed.
Received: 4 September 2017 / Revised: 30 September 2017 / Accepted: 3 October 2017 / Published: 12 October 2017
(This article belongs to the Special Issue Light Weight Alloys: Processing, Properties and Their Applications)
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Ti6Al4V titanium alloy is applied extensively in the aviation, aerospace, jet engine, and marine industries owing to its strength-to-weight ratio, excellent high-temperature properties and corrosion resistance. In order to extend the application range, investigations on welding characteristics of Ti6Al4V alloy using more welding methods are required. In the present study, Ti6Al4V alloy sheets were joined using resistance spot welding, and the weld nugget formation, mechanical properties (including tensile strength and hardness), and microstructure features of the resistance spot-welded joints were analyzed and evaluated. The visible indentations on the weld nugget surfaces caused by the electrode force and the surface expulsion were severe due to the high welding current. The weld nugget width at the sheets’ faying surface was mainly affected by the welding current and welding time, and the welded joint height at weld nugget center was chiefly associated with electrode force. The maximum tensile load of welded joint was up to 14.3 kN in the pullout failure mode. The hardness of the weld nugget was the highest because of the coarse acicular α′ structure, and the hardness of the heat-affected zone increased in comparison to the base metal due to the transformation of the β phase to some fine acicular α′ phase. View Full-Text
Keywords: Ti6Al4V titanium alloy; resistance spot welding; mechanical properties; microstructure Ti6Al4V titanium alloy; resistance spot welding; mechanical properties; microstructure

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Zhang, X.; Zhang, J.; Chen, F.; Yang, Z.; He, J. Characteristics of Resistance Spot Welded Ti6Al4V Titanium Alloy Sheets. Metals 2017, 7, 424.

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