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JWJ > Volume 33(2); 2015 > Article
Journal of Welding and Joining 2015 April;33(2) :91-96.
Published online April 30, 2015.
doi:https://doi.org/10.5781/JWJ.2015.33.2.91
The characteristics of bead welding on steel with process parameter during the laser-arc hybrid welding(Ⅱ) - Effect of heat input parameters -
Jond-Do Kim*, Gi-Hoon Myung**, In-Duck Park***
*Division of Marine Engineering, Korea Maritime and Ocean Univ., Busan 606-791, korea
**Graduate School, Korea Maritime and Ocean Univ., Busan 606-791, korea
***Busan Laser Application Support Center, Korea Institute of Machinery & Materials, Busan 618-230, korea
Correspondence: Jond-Do Kim  Email: jdkim@kmou.ac.kr
  Published online April 30, 2015
ABSTRACT
The laser-arc hybrid welding of SS400 steel was carried out with the use of disk laser equipment of 6.6kW maximum power and MAG equipment of pulse mode. Parameter regarding heat input is one of the most important factors that directly affect penetration characteristics and welding defect. Therefore in this study, the effects of laser power, welding speed and current, voltage and pulse correction were investigated. As experiment result, it was found that the lower heat input, the more likely humping bead is formed at the back, and such humping bead could be suppressed by increasing laser power and arc current or decreasing welding speed, thus increasing heat input. Also deep penetration could be achieved by reducing arc voltage or pulse correction parameter in the same welding condition.
Keywords: Laser-arc hybrid welding | Laser power | Welding current | Speed | Voltage | Pulse correction | Heat input
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