Laser welding process specification base on welding theories

Abstract

The laser welding technology expansiveness is growing rapidly nowadays. The laser welding technology process isn’t well known yet. Laser machining development is the base of this technology. From the welding technologies the fusion welding technology causes small heat affected zone (HAZ). The quality of the welded joint depends on the heat effect and the metal heat transfer. In case of this technology design the knowledge of the effect of the used parameters is important. We can acquire this knowledge by the way of practice.The problem of laser welding technology is the setting of the parameters. The used welding gas (Ar, CO2, He, etc. and their mixes, and percentages), the welding speed, the focus point and the used power rate are also important. The welded materials (chemical composition), the sheet thickness and the joint type also influence the welded joint quality.Welding tests will be done with different welding parameters (gas, speed, focus, power), in case of a metal with constant chemical composition, and welding setup.Optimal welding process will be specified based on the quality control results (destructive and nondestructive inspections).The used technology is a new technology and the effect of the parameters is not well known yet. In this work we wanted to show the relationship between preheating temperature and the Vickers hardness (HV10).