Method for laser welding one or more workpieces of hardenable steel in a butt joint

USRE47904E1 · kind E1 · reissue

Assignee

• WISCO Tailored Blanks GmbH · DE

Inventors

• Arndt Breuer · Duisburg, DE
• Dietmar Schaftinger · Rheinberg, DE
• Max Brandt · Duisburg, DE

Key dates

• Filing date: Jun 22, 2018
• Grant date: Mar 17, 2020
• Expiry date: Jun 22, 2038

Classification

• Technology area (CPC —): General

Abstract

A method for laser welding of one or more workpieces made from press hardenable steel, in a butt joint, in which the workpiece or the workpieces have a thickness of at least 1.8 mm and/or a jump in thickness of at least 0.4 mm arises at the butt joint including supplying filler wire into a molten bath generated by a laser beam. In order to ensure that the weld seam can reliably harden into a martensitic structure during the hot forming (press hardening), the filler wire contains at least one alloy element from the group of manganese, chromium, molybdenum, silicon and nickel, wherein the at least one alloy element is present in the filler wire with a mass proportion that is larger by at least 0.1% by weight than the mass proportion of the element in the press hardenable steel of the workpiece or the workpieces.