Laser soldering of stainless steel and glass assisted with copper coating

The research on laser welding of glass and metal mainly focuses on ultrashort pulse laser or nanosecond laser, since continuous wave (CW) laser cannot be directly applied to the welding of glass and metal. In this paper, a method of reliable bonding of copper-coated glass and stainless steel by laser soldering is proposed. The effects of welding parameters including laser power and irradiation time on the shearing force, shearing strength and welding area are discussed systematically. It can be concluded that the increase of laser power and irradiation time is beneficial to the improvement of welding strength. However, excessive heat input will lead to glass fragmentation and serious peeling of copper coating, causing the decrease of welding strength. At the welding parameters of laser power of 85 W and irradiation time of 50 s, the maximum shearing force of 3239 N and the maximum shearing strength of 39.17 MPa are obtained by laser irradiation on stainless steel.