Microstructure and Properties of Laser Welded Joints of TP321 Molten Salt Heat Collection Tubes in Linear Fresnel Solar Thermal Power Plants

ZHAO Hui; ZHANG Jun; WANG Wei; ZHANG Qianqian; LIU Weidong; ZHANG Jianwei; ZHANG Chao

doi:10.3969/j.issn.1674-6457.2026.07.015

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (7) : 166-174. DOI: 10.3969/j.issn.1674-6457.2026.07.015

Advanced Joining Technology

Microstructure and Properties of Laser Welded Joints of TP321 Molten Salt Heat Collection Tubes in Linear Fresnel Solar Thermal Power Plants

ZHAO Hui¹, ZHANG Jun^2,*, WANG Wei¹, ZHANG Qianqian², LIU Weidong¹, ZHANG Jianwei², ZHANG Chao²

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Abstract

The work aims to investigate the laser welding process, microstructure and properties of the laser welded joint of the TP321 molten salt collection tube in the linear Fresnel solar thermal power plants. TP321 molten salt tubes were welded with single-mode laser autogenous welding and laser swing wire feeding welding method. The single-mode laser swing wire feeding welding method was adopted. When the welding power was 1 500 W, the 4 mm thick TP321 molten salt collection tube could be welded with single-layer single-pass welding for one-time forming, with good weld appearance and root morphology and without defects such as cut, crack, pore, lack of fusion and incomplete penetration. The tensile test of the single-mode laser welded joint are all broken at the TP321 base material without breaking at the weld, and no harmful phases such as M₂₃C₆ are found in the microstructure. The heat affected zone has a good fusion narrow width, and the microhardness distribution of the welded joint is uniform.

Key words

linear Fresnel / molten salt heat collection tubes / TP321 / single-mode laser welding / microstructure and properties

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ZHAO Hui, ZHANG Jun, WANG Wei, ZHANG Qianqian, LIU Weidong, ZHANG Jianwei, ZHANG Chao. Microstructure and Properties of Laser Welded Joints of TP321 Molten Salt Heat Collection Tubes in Linear Fresnel Solar Thermal Power Plants[J]. Journal of Netshape Forming Engineering. 2026, 18(7): 166-174 https://doi.org/10.3969/j.issn.1674-6457.2026.07.015

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