Forming of Double Spot Laser Welded Joints of Heterogeneous DP780/DP590 Dual Phase Steel with Different Thicknesses

WANG Jiahao; LIU Yan; LIU Xiaoang; ZHANG Wenguang

doi:10.3969/j.issn.1674-6457.2025.07.009

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (7) : 79-88. DOI: 10.3969/j.issn.1674-6457.2025.07.009

Iron and Steel Forming

Forming of Double Spot Laser Welded Joints of Heterogeneous DP780/DP590 Dual Phase Steel with Different Thicknesses

WANG Jiahao¹, LIU Yan^2,*, LIU Xiaoang¹, ZHANG Wenguang¹

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Abstract

The work aims to reduce the welding defects by double spot laser welding process and investigate the effects of different process parameters on the macroscopic morphology of welded joints of unequal-thickness heterogeneous dual phase steels DP780 and DP590. Two kinds of dual phase steels, DP780 and DP590, were laser welded with Trudisk 5000 dual spot laser from TRUMPF. The macroscopic morphology of the front and back faces of welded joints and the depth and width of melt in the weld cross-section under different parameters were investigated by metallographic microscope. With the increase of laser power from 3 000 W to 5 000 W, the welding heat input gradually increased, the melt width of the weld increased, and when the laser power was 5 000 W, the melt width of the weld at front and back was the largest, and the welded joints were well formed. With the increase of the welding speed from 100 mm/min to 300 mm/min, the welding heat input decreased with the increasing temperature, the melt width of the weld showed an overall trend of decrease, and the depth of fusion firstly increased and then decreased. As the core-ring ratio increased from 55% to 75%, the melt depth and melt width firstly increased and then decreased. As the defocusing amount increased from -2 mm to 2 mm, the spot focusing plane rose gradually from the inside of the workpiece, the melt width of the weld firstly decreased and then increased, and when the defocusing amount was 2 mm, the weld width was the largest, with the optimal forming. In summary, the effects of laser speed and the core-ring ratio on the formation of welded joints are more significant. Under the welding parameters of laser power of 5 000 W, welding speed of 200 mm/min, core-ring ratio of 65%, and defocusing amount of 2 mm, the best forming results are obtained for the double spot laser welded joints of DP780 dual phase steel sheet with a thickness of 1.2 mm and DP590 dual phase steel sheet with a thickness of 1.4 mm.

Key words

heterogeneous dual phase steel / laser welding / double spot laser / forming effect / macroscopic morphology

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WANG Jiahao, LIU Yan, LIU Xiaoang, ZHANG Wenguang. Forming of Double Spot Laser Welded Joints of Heterogeneous DP780/DP590 Dual Phase Steel with Different Thicknesses[J]. Journal of Netshape Forming Engineering. 2025, 17(7): 79-88 https://doi.org/10.3969/j.issn.1674-6457.2025.07.009

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