Welding thermal cycle of the laser-arc hybrid welding of the EQ70 steel and its effects on the microstructure evolution of the heat affected zone

BAO Liangliang; WANG Yong; ZHANG Hongjie; XU Liang; HAN Tao

doi:10.12073/j.hjxb.20201207002

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2021 > 42(3): 26-33. > DOI: 10.12073/j.hjxb.20201207002

BAO Liangliang, WANG Yong, ZHANG Hongjie, XU Liang, HAN Tao. Welding thermal cycle of the laser-arc hybrid welding of the EQ70 steel and its effects on the microstructure evolution of the heat affected zone[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2021, 42(3): 26-33. DOI: 10.12073/j.hjxb.20201207002

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Welding thermal cycle of the laser-arc hybrid welding of the EQ70 steel and its effects on the microstructure evolution of the heat affected zone

1.
China University of Petroleum (East China), Qingdao 266580, China
2.
China Construction Industrial & Energy Engineering Group Co., Ltd., Nanjing 210000, China
3.
Harbin Modern Welding Technology Co., Ltd., Harbin 150028, China

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Received Date: December 06, 2020
Available Online: April 22, 2021

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Abstract

Abstract

The Visul Environment software was used to establish the 3D model of the laser-arc hybrid welding joint of EQ70 steel. The temperature field of the laser-arc hybrid welding was numerically simulated by the SYSWELD software. The thermal cycle characteristics of the laser-arc hybrid welding and its effects on the microstructure evolution of the heat affected zone (HAZ) were analyzed, combined with the thermocouple thermometry and microstructure characterization. The results shown that the combined heat source with double ellipsoid and peak increasing cone could accurately simulate the temperature field of the laser-arc hybrid welding, and the arc zone, transition zone and laser zone had similar thermal cycles in the same HAZ micro-zones. The HAZ heating rate can reach to 400 ℃/s, the dwelling time above 1 100 ℃ was 0.79−1.33 s, and the t_8/5 was 4−6 s. The coarse grained HAZ (CGHAZ) and the fine grained HAZ (FGHAZ) were mainly comprised of lath martensite. The microstructure of the inter-critically HAZ (ICHAZ) was martensite and grain boundary carbides. The sub-critically HAZ (SCHAZ) composed of tempered martensite. The rapid heating and short high temperature dwelling time of the laser-arc hybrid welding limited the austenite grain growth to some extent, and the average grain size of the CGHAZ and FGHAZ were 42.7 μm and 19.8 μm, respectively.
- EQ70,
- laser-arc hybrid welding,
- thermal cycle,
- heat affected zone

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References

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Welding thermal cycle of the laser-arc hybrid welding of the EQ70 steel and its effects on the microstructure evolution of the heat affected zone