Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7176393 | Journal of Materials Processing Technology | 2018 | 26 Pages |
Abstract
Laser welding of Q235 low carbon steel and 6061 aluminum (Al) alloy was carried out by using a dual beam fiber laser in keyhole welding mode in a steel-on-Al lapped configuration. The influence of processing parameters of power distribution ratios (Rs) and dual beam laser distances (d1) on the weld shapes, microstructures of intermetallic compound (IMC) layers, microhardness and tensile resistance of the steel/Al joints was studied. Soundly welded steel/Al joints have been achieved by using dual beam laser keyhole welding at Rsâ¯=â¯0.67 and d1â¯=â¯1.5â¯mm. The key factor affecting welding defects is the control of the penetration depth of the welds, and good weld shape has been achieved when the penetration depth of the welds is below 700â¯m. The formation of IMC phases consisted of Fe4Al13, Fe2Al5 and FeAl2 phases is only limited to the weld/Al interface when the steel/Al joint has a relatively low penetration depth of the welds in the steel/Al joint. The maximum tensile resistance of the steel/Al alloy joints of 115.6â¯N/mm is obtained under the conditions of Rsâ¯=â¯0.67 and d1â¯=â¯1.5â¯mm. The fracture surface reveals a mixed failure occurred in the Al alloy leading to high tensile resistance of the steel/Al joints.
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Physical Sciences and Engineering
Engineering
Industrial and Manufacturing Engineering
Authors
Li Cui, Boxu Chen, Li Chen, Dingyong He,