Patent · US Active

Detecting defects during laser welding

US8777482B2 · kind B2 · utility

16Cited by

15References

10Claims

0Family size

Assignee

TRUMPF Werkzeugmaschinen GmbH + Co. KG · DE

Inventors

Dieter Pfitzner · Weil der Stadt, DE
Tim Hesse · Ditzingen, DE
Winfried Magg · Ditzingen, DE

Key dates

Filing date	Nov 24, 2009
Grant date	Jul 15, 2014
Priority date	—
Expiry date	Jun 1, 2030

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB23K2103/50
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method for detecting defect in a weld seam during laser welding. The method includes performing a two-dimensionally locally resolved detection of radiation that is emitted by a solidified molten mass that is adjacent to a liquid melting bath. The method also includes determining at least one characteristic value for heat dissipation in the solidified molten mass by evaluating the detected radiation along at least one profile-section of the solidified molten mass, and detecting a defect in the weld seam by comparing the at least one characteristic value with at least one reference value.

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