Warning: fopen(/home/virtual/kwjs/journal/upload/ip_log/ip_log_2023-12.txt): failed to open stream: Permission denied in /home/virtual/lib/view_data.php on line 88 Warning: fwrite() expects parameter 1 to be resource, boolean given in /home/virtual/lib/view_data.php on line 89 Effect of B Contents on Hardness Characteristic of Disk Laser Beam Welded CP Steels

Journal of KWJS 2011;29(1):107-114.
Published online March 4, 2011.
CP강의 디스크레이저 용접부의 경도특성에 미치는 B 함유량의 영향
, , , , ,
Effect of B Contents on Hardness Characteristic of Disk Laser Beam Welded CP Steels
Tae-Jun Park, Jung-Woo Yu, Junil Kang, Tae-kyo Han, Kwang-Keun Chin, Chung-Yun Kang
  CP steel was developed to reduce the weight and increase the strength of car body. When it was welded using state-of-the-art disk laser welding, the effected of boron on the microstructure and hardness were investigated. Welding power was fixed at 3.5㎾ and welding speeds were 4,8 and 12m/min. Full penetration occurred in welding speed of 12m/min and weld bead was almost unchanged with boron contents. But the welding speed increased, the upper and lower bead were narrowed. In a welding speed of more than 8m/min, underfill defects were formed on the bead bottom. The hardness of weld zone was somewhat fluctuation in fusion zone and HAZ showed the highest hardness values. The hardness of each region showed little change with the boron contents, and softening phenomenon occurred in the HAZ near the base metal regardless of the boron contents.
Key Words: CP steel, Boron, Disk laser, Microstructure, Hardness

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 © 2023 by The Korean Welding and Joining Society.

Developed in M2PI