Method for the manufacture of a welded joint by Laser Arc Hybrid Welding

A method for the manufacture of a welded joint comprising the following successive steps:

• providing at least two metallic substrates wherein a first of the least two metallic substrates is a steel substrate having a thickness of at least 8 mm and being delimited by at least one beveled edge, the beveled edge being at least partially coated with a pre-coating including a titanate and a nanoparticulate oxide selected from the group consisting of TiO2, SiO2, ZrO2, Y2O3, Al2O3, MoO3, CrO3, CeO2, La2O3 and mixtures thereof;
• and
• welding the at least two metallic substrates along the at least partially coated beveled edge by laser arc hybrid welding in leading arc configuration.

A method for the manufacture of a pre-coated steel substrate comprising the successive following steps:

• providing a steel substrate having a thickness of at least 8 mm and being delimited by at least one beveled edge with a bevel angle between 1 and 10°;
• and
• depositing, at least partially on the beveled edge, a pre-coating solution including a titanate and a nanoparticulate oxide selected from the group consisting of TiO2, SiO2, ZrO2, Y2O3, Al2O3, MoO3, CrO3, CeO2, La2O3 and mixtures thereof.

A coated steel substrate comprising:

• a steel substrate having a thickness of at least 8 mm and being delimited by at least one beveled edge with a bevel angle between 1 and 10°, the beveled edge being at least partially coated with a pre-coating comprising a titanate and a nanoparticulate oxide selected from the group consisting of TiO2, SiO2, ZrO2, Y2O3, Al2O3, MoO3, CrO3, CeO2, La2O3 and mixtures thereof.