Patent · US Active

Detection of hot cracks in laser welding

US11229973B2 · kind B2 · utility

2Cited by

2References

16Claims

0Family size

Assignee

TRUMPF LASER- UND SYSTEMTECHNIK GMBH · DE

Inventors

Patrick Haug · Dinkelsbühl, DE
Tim Hesse · Ditzingen, DE
Steffen Kessler · Stuttgart, DE
Marcel Schäfer · Ditzingen, DE
Philipp Scheible · Mühlacker, DE

Key dates

Filing date	Sep 18, 2018
Grant date	Jan 25, 2022
Priority date	—
Expiry date	May 13, 2040

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB23K2103/04
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

Methods for determining the quality of a weld of a workpiece welded by laser-beam welding, wherein at least a partial region of a molten pool and/or of a surrounding area of the molten pool is observed by means of a measuring system during the laser-beam welding and the quality of the weld of the welded workpiece is determined on the basis of the observation result. At least one characteristic value that correlates with molten pool oscillation of the molten pool is observed during the laser-beam welding and a measure of an amplitude of the molten pool oscillation and/or a measure of a frequency of the molten pool oscillation is determined from the observed time curve of the characteristic value. A probability and/or a frequency for the occurrence of hot cracks at the weld of the workpiece is inferred.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.