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Spiking and Humping Defects in Laser Welding

[+] Author Affiliations
P. S. Wei, K. C. Chuang, J. S. Ku

National Sun Yat-Sen University, Kaohsiung, Taiwan

Paper No. IMECE2010-39513, pp. 83-87; 5 pages
doi:10.1115/IMECE2010-39513
From:
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 4: Electronics and Photonics
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4428-1
  • Copyright © 2010 by ASME

abstract

Pitches of surface humps or coarse ripples and spikes affected by the focusing characteristics and scanning speed in high-intensity electron-beam welding or melting are quantitatively measured. Humping and coarse rippling are referred to surface roughness, which often accompanies with undercut, segregation, porosity and other defects. Spiking represents a sudden increase in penetration beyond the average penetration line. In this work, acceleration voltage and welding current of the electron beam welder used are 55 kV and 20 mA, whereas scanning speed is between 15–30 mm/s. Specimens are Al 6061, 1050, 1100 and 5083, and SS 304. This study found that humping and coarse rippling are enhanced by lowering the focal spot location. The measured amplitudes of humping are confirmed by successfully comparing with scale analysis.

Copyright © 2010 by ASME

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