Investigation on microstructure and impact toughness of double-pass laser-arc hybrid welding heat affected zone

BAO Liangliang; LIU Fujian; XU Yanhong; ZHANG Xinming; OUYANG kai; HAN Tao

doi:10.12073/j.hjxb.20220303001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2022 > 43(12): 90-99. > DOI: 10.12073/j.hjxb.20220303001

BAO Liangliang, LIU Fujian, XU Yanhong, ZHANG Xinming, OUYANG kai, HAN Tao. Investigation on microstructure and impact toughness of double-pass laser-arc hybrid welding heat affected zone[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2022, 43(12): 90-99. DOI: 10.12073/j.hjxb.20220303001

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Investigation on microstructure and impact toughness of double-pass laser-arc hybrid welding heat affected zone

1.
China Construction Industrial & Energy Engineering Group Co., Ltd., Nanjing, 210000, China
2.
China University of Petroleum (East China), Qingdao, 266580, China

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Received Date: March 02, 2022
Available Online: December 07, 2022

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Abstract

Abstract

Homogeneous specimens of the double-pass laser-arc hybrid welding heat affected zone (HAZ) of low alloy high strength steels were prepared by welding simulation technology, the influence of second peak temperature on the microstructure and toughness of the simulated specimens was investigated. The results showed that the unaltered coarse grained HAZ (UACGHAZ) compose of coarse lath martensite (LM) with an average grain size between 84 − 98 μm. The supercritically reheated CGHAZ (SCRCGHAZ) is comprised of fine LM with an average grain size between 15.7 − 19.2 μm. The intercritically reheated CGHAZ (ICCGHAZ) compose of LM with blocky martensite-austenite constituents distributed along grain boundaries and subgrain boundaries. The subcritically reheated CGHAZ (SRCGHAZ) is comprised of LM with an average grain size between 79 − 88 μm. The instrumented impact test results showed that the ICCGHAZ specimens own the lowest resistance to crack initiation, and the ICCGHAZ and UACGHAZ had the poorest resistance to crack propagation.
- low alloy high strength steel,
- laser-arc hybrid welding,
- heat affected zone,
- microstructure,
- toughness

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References (17)

References

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Investigation on microstructure and impact toughness of double-pass laser-arc hybrid welding heat affected zone