Warning: fopen(/home/virtual/kwjs/journal/upload/ip_log/ip_log_2022-07.txt): failed to open stream: Permission denied in /home/virtual/lib/view_data.php on line 83 Warning: fwrite() expects parameter 1 to be resource, boolean given in /home/virtual/lib/view_data.php on line 84 Position welding for internal welded specimen using laser-GMA hybrid welding

J Weld Join > Volume 33(1); 2015 > Article
Journal of Welding and Joining 2015;33(1):54-60.
DOI: https://doi.org/10.5781/JWJ.2015.33.1.54    Published online February 28, 2015.
Position welding for internal welded specimen using laser-GMA hybrid welding
Young-Nam Ahn*, Cheolhee Kim*, Jeonghan Kim*
Correspondence:  Cheolhee Kim,
Email: chkim@kitech.re.kr
Abstract
Laser-arc hybrid welding has been considered as an effective pipe girth welding process since early 2000's. Tolerance for fit-up offsets such as gap and edge misalignment is one of most important requirements in pipe girth laser-arc hybrid welding, and several approaches using parameter optimization, a laser beam scanning and an arc oscillation have been tried. However the required offset tolerance has not been fully accomplished up to now and laser-arc hybrid welding has not been widely applied in pipeline construction than expected, despite of its high welding speed and deep penetration. In this study, internal welding was adopted to ensure the offset tolerance and sound back bead. The effect of welding parameters on bead shape was investigated at the flat position. Also tolerances for gap and edge misalignment were verified as 0.5 mm and 2.0 mm, respectively. The position welding trials were conducted at several welding positions from the flat to the overhead position in a downward direction. With the fixed welding speed, arc current for gas metal arc welding current and laser output power, adequate welding voltages for gas metal arc welding were suggested for each position.
Key Words: Laser-Arc hybrid welding, Internal welding, Root pass welding, Pipe girth welding
TOOLS
METRICS Graph View
  • 1 Crossref
  •    
  • 1,680 View
  • 17 Download
Related articles


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 © 2022 by The Korean Welding and Joining Society.

Developed in M2PI