Warning: fopen(/home/virtual/kwjs/journal/upload/ip_log/ip_log_2024-12.txt): failed to open stream: Permission denied in /home/virtual/lib/view_data.php on line 100 Warning: fwrite() expects parameter 1 to be resource, boolean given in /home/virtual/lib/view_data.php on line 101 [Research Papers] Characteristics of CO₂ or Nd : YAG Laser Welded 600㎫ Grade TRIP Steel

Journal of KWJS 2006;24(1):56-63.
Published online April 3, 2006.
[연구논문] 600㎫급 TRIP강의 CO₂ 및 Nd : YAG 레이저 용접부의 특성
, , , ,
 
[Research Papers] Characteristics of CO₂ or Nd : YAG Laser Welded 600㎫ Grade TRIP Steel
Tae-Kyo Han, Seung-Jun Kim, Bong-Keun Lee, Dae-Up Kim, Chung-Yun Kang
Abstract
The characteristics of CO₂ or Nd:YAG laser welded 600㎫ grade TRIP steel was investigated. He or Ar gas was used as a shield gas in case of CO₂ laser welding, but the shield gas was not used in case of Nd:YAG laser welding. Bead on plate welding was performed with various welding conditions. Defects in the joints of both welding type occurred at 1.8m/min but were not observed over the welding speed of 2.1m/min in case of Nd:YAG laser welding. However, porosity occurred in CO₂ laser welding and the tendency of decreasing with the increase of welding speed. The hardness was the highest at heat affected zone near fusion zone as well as at the fusion zone and decreased on approaching the base metal. In a perpendicular tensile test to the weld line, all specimens that have been welded at optimum conditions were fractured at the base metal, and the tensile properties showed the rather higher than those of raw material. In a parallel tensile test, the strength of the joints was higher than that of the base metal. Elongation was found to be lower than that of the raw material. Forming height by Erichsen test and elongation were deeply related with the ratio of base metal/weld metal and the maximum hardness of the weld metal. Also porosity induced to decrease the strength and the elongation. The maximum formability was recorded at approximately 80% as compared with that of the raw material with the optimum condition.


ABOUT
BROWSE ARTICLES
ARTICLE CATEGORY 
FOR CONTRIBUTORS
Editorial Office
#304, San-Jeong Building, 23, Gukhoe-daero 66-gil, Yeongdeungpo-gu, Seoul 07237, Korea
Tel: +82-2-538-6511    Fax: +82-2-538-6510    E-mail: koweld@kwjs.or.kr                

Copyright © 2024 by The Korean Welding and Joining Society.

Developed in M2PI