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

Fingerprint

Steel sheet
welding
stainless steels
Welding
Stainless steel
high speed
Scanning
scanning
Lasers
lasers
Single mode fibers
Fiber lasers
Laser beams
fiber lasers
YAG lasers
pulsed lasers
Seam welding
laser beams
Periodic structures
metal sheets

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

Cite this

Fine micro-welding of thin stainless steel sheet by high speed laser scanning. / Okamoto, Yasuhiro; Gillner, Arnold; Olowinsky, Alexander; Gedicke, Jens; Uno, Yoshiyuki.

In: Journal of Laser Micro Nanoengineering, Vol. 3, No. 2, 01.04.2007, p. 95-99.

Research output: Contribution to journalArticle

Okamoto, Yasuhiro ; Gillner, Arnold ; Olowinsky, Alexander ; Gedicke, Jens ; Uno, Yoshiyuki. / Fine micro-welding of thin stainless steel sheet by high speed laser scanning. In: Journal of Laser Micro Nanoengineering. 2007 ; Vol. 3, No. 2. pp. 95-99.
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