| dc.description.abstract | The bonding of dissimilar materials can combine the excellent properties of individual materials and simplify the machining process. Metal has good conductivity and glass has a high dielectric coefficient. The welding of glass and metal has been applied to the fields such as MEMS, medical equipment, automobile, aerospace, and so on. Compared with traditional welding techniques, laser transmission welding has favorable characteristics such as rapidity, selectivity, and non-contact processing. It is a reliable solution with great application potential.
In the past, there was a lack of systematic research on laser transmission welding of metals and glasses, and most of the published research focused on the use of ultrafast lasers. There are relatively few reports on transmission welding using nanosecond lasers. The process and mechanism of laser welding generally differ for different types of laser sources. However, according to the research results, there is no significant difference in the welding quality between nanosecond laser and ultrafast laser in metal and glass welding. Relatively, nanosecond laser systems are well-established and generally less expensive than ultrafast lasers, giving them an advantage in industrial applications.
In this study, a nanosecond laser with a near-infrared wavelength of 1064 nm was used to weld aluminum alloy 5052 and glass. Due to the initial surface roughness of the aluminum alloy substrate, an air gap inevitably exists between the aluminum alloy and the glass. Based on previous studies, this study designed a welding fixture that provided pressure assistance and adopted a single-cycle, single-direction oscillating line-scanning strategy to reduce the influence of the air gap on welding. This research aims to make up for the deficiency of the metal-glass nanosecond laser welding mechanism, to improve the welding quality.
Experimental results show that there is a range of parameter processing windows that is favorable for welding that does not cause defects in the glass. The maximum average welding strength obtained was 46.78 MPa. This study explores the effects of chemical compositions and surface morphology on the resulting weld, analyzes the failure mode of the welded joint, and illuminates the phenomenon of videoed machining processes. Consequently, a comprehensive flow chart to describe the possible process for the welding of glass and aluminum alloy using a nanosecond laser was proposed.
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