Improvement of mechanical property on TC17 welded joints with backing plates by TIG + brazing hybrid welding

TIG welding is used for TC17 titanium alloy butt welding with backing plates. The silver-based brazing materials as interlayer is applied and a hybrid joint is obtained comprising two metallurgical bonding zones based on two different kinds of joining mechanisms. The microstructure and mechanical pr...

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Bibliographic Details
Published in:Welding in the world 2023-09, Vol.67 (9), p.2123-2132
Main Authors: Zhao, Xilong, Lu, Xinhong, Wang, Kun, He, Feng
Format: Article
Language:English
Subjects:
Arc welding
Base metal
Bonded joints
Braze welding
Brazing alloys
Butt welding
Chemistry and Materials Science
Fusion welding
Gas tungsten arc welding
Heat affected zone
Interdiffusion
Interlayers
Materials Science
Mechanical properties
Metallic Materials
Metallurgy
Microhardness
Microstructure
Plates
Research Paper
Silver
Solid Mechanics
Theoretical and Applied Mechanics
Titanium alloys
Titanium base alloys
Weld metal
Welded joints
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Summary:TIG welding is used for TC17 titanium alloy butt welding with backing plates. The silver-based brazing materials as interlayer is applied and a hybrid joint is obtained comprising two metallurgical bonding zones based on two different kinds of joining mechanisms. The microstructure and mechanical properties of welding specimens are compared under TIG welding and TIG + brazing hybrid welding methods. The microstructure evolution of different welded joints is characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and X-ray diffractometer (XRD). Microhardness test and shear punch test are employed to investigate the mechanical properties of each micro-zone in welded joints. The results show that the welding arc has been focused on the middle area of the two butt plates during the welding. Titanium alloy and brazing materials fusion welding process is realized at the titanium alloy-brazing materials interface, and interdiffusion reaction occurred in these regions. The microhardness distribution trends of welded joints under the two welding methods is similar, and base metal (BM) > heat-affected zone (HAZ) > weld metal (WM). The highest microhardness value is found in the brazed area (BA) with an average value of approximately 429 HV. The shear load of TIG + brazing hybrid welded joints in the WM is 1897 N and the 2256 N in the BA which is significantly higher than TIG welded joints.
ISSN:0043-2288
1878-6669
DOI:10.1007/s40194-023-01532-4