A Study on the Feasibility of Partial Penetration Laser Welding for the Lap Joint of 390MPa High Strength Steel Sheets

390MPa급 고장력강판의 경치기 레이저 용접에서 부분용입 용접의 적용 가능성에 대한 연구

  • 이경돈 (고등기술연구원 시스템제어/레이저응용 센타) ;
  • 박기영 (고등기술연구원 시스템제어/레이저응용 센타) ;
  • 김주관 (고등기술연구원 시스템제어/레이저응용 센타)
  • Published : 2002.04.01


After high power lasers are avaliable in the commercial market, the number of applications of the laser welding has been increased in manufacturing industries. Although the tailored blank laser welding of butt jointed steel sheets is well known recently in the automotive industries, the lap joint laser welding is a new technology to the automotive manufacturing people as well as the design people. But the deep penetration laser welding seems to be preferred to the partial penetration welding for the lap joint welding in the automotive manufacturers because the partial penetration is a serious deflect for the butt joint. In this study, the feasibility of partial penetration welding fur the lap joint $CO_2$ laser welding was studied fur the 1mm thick 390MPa high strength steel sheets for automotive bodies. The process window of the lap joint partial penetration welding was obtained from experiments with the gap size and the welding speed as process parameters. The partial penetration welding was found excellent on the basis of the tensile shear strength and sectional geometry. The bead width, input energy Per volume, tensile-shear strength, deformation energy and the sectional geometries after tensile-shear tests of partial penetration welded specimens are compared with those of full penetration welded specimens with a series of gaps and welding speeds.



  1. Proceedings of the 19th International Congress on Applications of Lasers and Electro-optics(ICALEO) The Welding of Galvanized Steel Paul Denney;Jian Xie
  2. Proceedings of the 19th International Congress on Applications of Lasers and Electro-optics(ICALEO) Laser Welding of Hem Flange Joints Robert Mueller
  3. J. of the Korean Welding Society v.17 no.2 A Study on Mechanical Shearing Process for Tailored Blank Welding B. K. Yoo;K. D. Lee
  4. J. of the Korean Welding Society v.19 no.4 Nd;YAG Laser Welding for Side Panel In-Sung Chang
  5. J. of the Laser Applications v.12 no.6 Weld Strength and Process Controllability for Laser Welding of Thin Metals J. Du;J. Longobardi;W. P. Latham;A. Kar https://doi.org/10.2351/1.1324715
  6. Welding Research Supplement Critical Specimen Sizes for Tensile-Shear Testing of Sheets M. Zhou;S. J.Hu;H. Zhang
  7. IAE report, 2060-MP -01.01 Effects of the Gap and the Speed on the Lap-Joint CO2 Laser Welding of Automotive Steel Sheets K. D. Lee;K. Y. Park
  8. J. of Material Science 30 Calculation of CO2 Laser Beam Absorptance as a Funcation of Temperature for Steels by the Numerical Method T. H. Kim;K. C. Chong;B. Y. Yoo;J. S. Lee;K. H. Whang