Effect of defocuson performance of butt joints of pure titanium sheet

ZHOU Leilei

doi:10.7510/jgjs.issn.1001-3806.2019.03.020

LASER TECHNOLOGY > 2019 > 43(3): 397-400. > DOI: 10.7510/jgjs.issn.1001-3806.2019.03.020

ZHOU Leilei. Effect of defocuson performance of butt joints of pure titanium sheet[J]. LASER TECHNOLOGY, 2019, 43(3): 397-400. DOI: 10.7510/jgjs.issn.1001-3806.2019.03.020

Citation:

ZHOU Leilei. Effect of defocuson performance of butt joints of pure titanium sheet[J]. LASER TECHNOLOGY, 2019, 43(3): 397-400. DOI: 10.7510/jgjs.issn.1001-3806.2019.03.020

Citation:

ZHOU Leilei. Effect of defocuson performance of butt joints of pure titanium sheet[J]. LASER TECHNOLOGY, 2019, 43(3): 397-400. DOI: 10.7510/jgjs.issn.1001-3806.2019.03.020

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Effect of defocuson performance of butt joints of pure titanium sheet

ZHOU Leilei

State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Panzhihua Iron and Steel Research Institute Co. Ltd., Panzhihua 617000, China

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Received Date: July 05, 2018
Revised Date: July 19, 2018
Published Date: May 24, 2019

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Abstract

Abstract

In order to study the properties of laser butt welding joint of pure titanium sheet, a welding system consisting of fiber laser and robot was used to carry out the welding test. Effect of defocus on the properties of the joint was evaluated comprehensively by testing the tensile properties, porosity and cupping value of the joint. The microstructure of the joint was revealed. The results show that the tensile and forming properties of the joints are lower than those of the base metal. The defocus has no direct effect on the tensile properties. To a certain extent, the formability of the joint increases with the increase of defocus. When the defocus is +20mm, the joint has the best tensile and forming properties. The microstructures in the weld zone are coarse α grains + serrated α grains + a small amount of acicular α grains. The existence of acicular α grains is beneficial to improve the formability of the joints. The microstructure of heat affecting zone (HAZ) is composed of irregular coarse α grains + serrated α grains. The grain size of HAZ is lower than that of weld zone. This research has certain theoretical guiding significance for laser welding of pure titanium.
- laser technique,
- laser welding,
- defocus,
- property,
- microstructure

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