Metall. Res. Technol.
Volume 118, Number 1, 2021
|Number of page(s)||5|
|Published online||04 December 2020|
Laser welding-brazing of alumina to 304 stainless steel with an Ag-based filler material
School of Mechanical Engineering, Xinjiang University,
830000, PR China
2 Key Laboratory of Automobile Materials, School of Materials Science and Engineering, Jilin University, Changchun 130022, PR China
3 State Key Laboratory for Manufacturing Systems Engineering, Xian 710000, PR China
* e-mail: email@example.com
Accepted: 10 November 2020
In this paper, laser welding-brazing of 304 stainless steel (SS) and Al2O3 ceramic dissimilar metal material was carried out. The results showed that the SS and Al2O3 were joined by melting filler metal when the laser was focused on the SS side of the joint. One process was one pass welding involving creation of a joint with one fusion weld and one brazed weld separated by remaining unmelted SS. When laser beam was focused on the SS plate 1.5 mm, SS would not be completely melted in joint. Through heat conduction, the filler metal (68.8 wt.% Ag, 26.7 wt.% Cu, 4.5 wt.% Ti) melting occurred at the SS-Al2O3 ceramic interface. A brazed weld was formed at the SS-Al2O3 ceramic interface with the main microstructure of Cu[s.s.] + Ag[s.s.], Ti2Cu + TiFe and Ag + AlCu2Ti. The joint fractured in reaction layer at the ceramic side with the maximum tensile strength of 74 MPa.
Key words: 304 stainless steel / Al2O3 ceramic / welding / microstructure / filler metal
© EDP Sciences, 2020
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