Welding threshold in ultrafast laser welding of quartz glass and 304 stainless steel

Welding of glass and metal materials by ultrafast laser has emerged as important research in advancing welding technology. Current research predominantly centers on single parameter experiments, yet efficiently correlating welding parameters between welding quality remains challenging. In this work, welding of quartz glass to 304 stainless steel using a picosecond laser is conducted. The welding thresholds are proposed and established through experimental analysis, and the impact of the effective quantity of incident pulses on this threshold is investigated. Three welding behaviors are confirmed by contrasting the welding threshold with alternative thresholds and demonstrated by observing the cross-section of weld. Through the proposal and study of welding thresholds, the investigation into welding principles has become more intuitive and efficient.