Butt-joint deep penetration laser welding method

US11975408B2 · kind B2 · utility

Assignee

• SMS group GmbH · DE

Inventors

• Jens Artel · Kirchhundem, DE
• Sebastian Seegers · Niederkassel, DE
• Christian Dornscheidt · Mülheim an der Ruhr, DE
• Lutz Kümmel · Jüchen, DE
• Jens Szonn · Düsseldorf, DE

Key dates

• Filing date: Dec 18, 2020
• Grant date: May 7, 2024
• Expiry date: Dec 18, 2040

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23K2103/04
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A butt joint deep penetration laser welding method is used for joining facing end sections of flat steel products, each having a carbon content CS<0.02%. In order to improve such a method such that an improved weld quality in terms of geometry and strength is achievable with it, at least one carbon-containing carrier material is inserted into a butt joint gap between the end sections, the carbon content of which is CT≥20·CS, preferably CT≥100·CS, and/or carbon is inserted into the butt joint gap or applied to at least one end section, such that the volume of the carbon inserted into the butt joint gap corresponds to 1% to 20% of the volume of a melt produced by a butt joint deep penetration laser welding process.