Laser soldering for steel bodywork parts

A method for laser soldering, the method comprising,

• selecting a copper-containing material as a filler material,
• supplying the filler material at a butt joint of two components, and
• melting the filler material in a main process zone by laser radiation in an advancement direction,
• wherein
• the filler material in the main process zone is melted by the laser radiation of a wavelength λH in a blue spectral range,
• with 400 nm≤λH≤500 nm,
• at least in the main process zone, the laser radiation with a higher power output density in a rectangular core region and a lower power output density in a ring region surrounding the core region is used, wherein the rectangular core region has a length along a large main axis and a width along a small main axis, the length being greater than the width, and wherein the large main axis of the rectangular focus is oriented in the advancement direction, and
• wherein the laser radiation of the main process zone is created by using a multiclad fiber or a diffractive optical element.