Effect of Laser Power on Tensile Performance of TA15 Laser-Welded Lock Bottom Joint

Qi, Na; Zhan, Xiaoli; Chen, Shuai; Chen, Dan; He, Shufei

doi:10.1007/s12540-020-00737-2

Cited by 4 publications

(2 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ti-6Al-4V titanium alloy is extensively used in the modern aerospace industry, as critical components [1][2], due to its excellent structural properties such as low density, high speci c strength and outstanding corrosion resistance [3][4]. The locking bottom joint, composed of a butt joint with a certain depth and a lap joint, is the main connection form of the fork ring and the short shell of the launch vehicle tank [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…Chamanfar et al [31] examined the microstructure, microhardness, tensile properties, and fracture characteristics of the laser-welded Ti-10V-2Fe-3Al titanium alloy in the as-welded condition. Qi et al [7] analyzed the microstructure and tensile performance of the TA15 titanium alloy bottom-locking joints by laser welding. However, few studies have been conducted on the distribution characteristics and formation mechanism of porosity during laser welding of the Ti-6Al-4V bottom-locking joint.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study on the distribution, element characteristics, and formation mechanism of porosity during laser welding for Ti-6Al-4V bottom-locking joint

Kang

Yan²,

Wang³

et al. 2022

Int J Adv Manuf Technol

Self Cite

View full text Add to dashboard Cite

The bottom-locking joint is widely used in the aerospace manufacturing eld as an imperative connection structure. The laser welding experiment for the Ti-6Al-4V titanium alloy bottom-locking joint is carried out in the present paper. Meanwhile, porosity in the weld seam including the process porosity and metallurgical porosity is investigated. Furthermore, it is novel that the distribution, element characteristics, and formation mechanism of process porosities and metallurgical porosities in the bottom-locking joint are comprehensively analyzed based on the porosity morphology, microstructure, and element analysis of the resultant bottom-locking joints. The process porosity, which mainly appeared in the weld seam centre, is formed by the combined effect of two mechanisms which closely related to the dynamic behaviour of the molten pool and the stability of the keyhole. Besides, a large number of micropores with a diameter of 2-5 µm are observed on the surface of the process porosity, whose formation is related to the evaporation of elements. Moreover, the tensile stress generated during the solidi cation and shrinkage of the molten metal is the main factor leading to microcracks in the micropores. The nucleation characteristics of bubbles cause metallurgical porosities to be mainly distributed at the bottom of the weld seam.

show abstract