Manufacturing Process and Compression Performance of TC4 Pyramid Lattice Structure with Laser Welding

doi:10.11901/1005.3093.2020.286

Chinese Journal of Materials Research

2021, Vol. 35

Issue (8): 623-631 DOI: 10.11901/1005.3093.2020.286

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Manufacturing Process and Compression Performance of TC4 Pyramid Lattice Structure with Laser Welding

LIU Wei, WANG Hui, CHU Xingrong(

), WANG Yangang, GAO Jun

School of Mechatronics and Information Engineering, Shandong University (Weihai), Weihai 264209, China

Cite this article:

LIU Wei, WANG Hui, CHU Xingrong, WANG Yangang, GAO Jun. Manufacturing Process and Compression Performance of TC4 Pyramid Lattice Structure with Laser Welding. Chinese Journal of Materials Research, 2021, 35(8): 623-631.

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Abstract

Based on the TC4 Ti-alloy core formed by alternating pin-press method at high-temperature, the laser welding connection process of the panel and the core was investigated in order to manufacture the pyramid lattice structure of Ti-alloy. The laser welding parameters were optimized by response surface method, the plane and core of lattice structure were connected, the microstructures of welding joints were examined, and the compression performance of lattice structure was investigated. The results show that the laser power has the most significant influence on the welding result. The optimized parameters of laser welding of lattice structure face core were as follows: welding power of upper panel was 1.4 kW, welding power of lower panel was 1.2 kW, defocusing quantity was 30mm, and residence time was 1 s. The martensite transformation of Ti-alloy occurred, and a large number of acicular martensite phases distributed in the heat affected zone of laser welding. The microstructure of welding zone was coarse β phase and acicular α phase. The microhardness decreased from the weld zone to the base metal in the welding joints with the decreasing of martensite phase. Based on the compression process recorded by the camera the deformation and failure process of the pyramid lattice structure were analyzed. The failure fracture of truss rod occurred in the heat-affected zone. The compression pressure strength and modulus of the TC4 Ti-alloy lattice structure manufactured by laser welding were 3.09 MPa and 153.25 MPa, respectively.

Key words: metallic materials pyramid lattice structure laser welding microstructure compression performance

Received: 13 July 2020

ZTFLH:

TG430.40

Fund: Natural Science Foundation of Shandong Province(ZR2019MEE008);Major Innovation Project of Shandong Province(2019TSLH0103)

About author: CHU Xingrong, Tel: (0631)5688338, E-mail: xrchu@sdu.edu.cn

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	Wei LIU
	Hui WANG
	Xingrong CHU
	Yangang WANG
	Jun GAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.286 OR https://www.cjmr.org/EN/Y2021/V35/I8/623

Table 1 Composition of TC4 (mass fraction/%)

Fig.1 Pyramid lattice core manufactured by high-temperature alternating pin-press method (a) schematic, (b) pyramid lattice core

Fig.2 Welding equipment and fast fixture

Fig.3 Welding of the lattice structure (a) lower panel, (b) upper panel

Table 2 Factors and levels of the optimization of laser welding parameter by response surface method

Table 3 Experimental design and results of the optimization of laser welding parameter by response surface method

Fig.4 Spot welding test pieces of response surface experiment

Table 4 Variance analysis of the solder joint diameter mathematical model

Fig.5 Response surface and contour map of welding spot diameter, laser power and defocus quantity

Fig.6 Laser welding TC4 1×1 unit lattice structure (a) pyramid lattice structure connected by laser weld-ing, (b) upper panel, (c) lower panel

Fig.7 Original metallography of TC4

Fig.8 Microstructure in different zone (a) base material zone, (b) heat affected zone, (c) welding zone, (d) plastic hinge zone

Fig.9 Distribution of microhardness at the joint of laser welded lattice structure

Fig.10 Failure process during compression of laser welding lattice structure

Fig.11 Compression load displacement curve of laser welding lattice structure

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