Article:

 Hybrid laser welding of DP600 dual phase steel: microstructural and mechanical properties and joint preparation

Author:

 Wim Van Haver

Contact:

Link to pdf-file

Link to site

 http://www.bil-ibs.be

DP600 advanced high strength steel sheet with a thickness of 1,4 mm was subjected to both CO2-laser/MAG and diode pumped Nd:YAG-laser/MAG hybrid welding. The selection of adequate filler metal and heat input with respect to weld metal and HAZ strength matching is discussed, and a comparison of the resulting microstructure and mechanical properties obtained with both HLW processes, as well as “classic” laser welding and MAG welding, is made. The weld gap bridging ability of the HLW process is measured and compared to that obtained in laser welding. Finally, the appearance of hot cracks is studied into more detail.