Patent ID: 8304687

Claim:
A spot welding process using a laser beam in which the welding of two members by spot welds comprises, for each spot weld, a first step of preparation by said laser beam of a weld region in which the spot weld will occur, followed by a second step of welding by said laser beam, said first step being adapted to modify a surface state in said weld region to obtain predefined conditions suited to the implementation of said second step, said first step comprising the following operations: a) directing said laser beam onto said weld region, b) measuring the value of at least one physical parameter that is characteristic of the surface state of said weld region to monitor the evolution thereof, and c) adjusting, during said first step, the characteristics of said laser beam as a function of the evolution of the value of said physical parameter, determined in operation b), in order to obtain said predefined conditions before implementing said second step.