Fine micro-welding of thin stainless steel sheet by high speed laser scanning

Yasuhiro Okamoto, Arnold Gillner, Alexander Olowinsky, Jens Gedicke, Yoshiyuki Uno

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Fraunhofer Institute for Laser Technology had developed the SHADOW® welding technique, in which high speed joining with minimal distortion is possible using a pulsed Nd:YAG laser. The possibility of high speed, high quality welding had been also reported by use of a single-mode fiber laser. The combination of micro-beam and high speed laser scanning offers potential advantages for thin metal sheet welding. Therefore, the characteristics of micro-welding for thin stainless sheet were investigated here by high speed laser scanning with both single-mode fiber laser and pulsed Nd:YAG laser. The results were a narrow welding region obtained using a laser beam with a large focus diameter of 160 μm without pulse control, while a small focus diameter of 22 μm was found in general to provide good control of the welding state. A small focus diameter can result in an excellent welding seam from the start, even without pulse control. The penetration depth could be controlled by the energy density with a small focus diameter. For the smaller beam foucus diameter, an unique periodic structure appeared at high beam scanning velocities. Moreover, by using a laser beam with a small focus diameter, the overlap welding of 25 μm thickness sheet could be successfully performed, regardless of the presence of a small gap distance between two sheets.

Original languageEnglish
Pages (from-to)95-99
Number of pages5
JournalJournal of Laser Micro Nanoengineering
Volume3
Issue number2
DOIs
Publication statusPublished - Apr 1 2007

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Keywords

  • High speed scanning
  • Micro spot
  • Nd:YAG laser
  • SHADOW®
  • SM fiber laser
  • Thin sheet

ASJC Scopus subject areas

  • Instrumentation
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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