Abstract: The online monitoring system database is an important basis for evaluating welding quality,and can provide real-time tracking and recording of many process parameters.For laser welding,welding quality is the result of the combined effect of laser power,spot size,welding speed,and various influencing factors.Laser power and welding speed are important factors that restrict and affect the quality of laser welding,which contain a large amount of information reflecting the characteristics of welding process performance and welding quality.This article designs an online monitoring database system to collect sufficient welding parameters.Through the playback of process parameter curve waveforms and signal analysis functions in the system,the changes in process parameters are analyzed to study the changes in the welding process.Furthermore,the welding defects that occur during the welding process are analyzed,ultimately forming a database that can accurately reflect the welding quality.