Process and assembling apparatus for welding of 2 pieces

Inventor: Didier BOISSELIER

French Patent N°99 03182 - Date: 12/03/99

This patent presents an original solution to solve the difficult problem of assembling by laser 2 zinc coated sheets in lap welding configuration. With the technique of double track or tandem that consists in creating a melting pool on the upper sheet which affects the zinc present at the interface, it becomes possible to make gap-free lap welding by moving the laser beam on the previous track. This treatment before welding can be made with an electric energy source or by laser, either as a distinct operation, or during the welding process by making the treatment at a short distance from the welding laser beam.