[1] Lu H, Xing L W, Chen D J. Research on A-MAG welding of weathering resistant steel[J]. Transactions of the China Welding Institution, 34, 105-108(2013).

[2] Rao Q P, Wu X Y, Tao C Q et al. Fatigue performance of laser-MAG hybrid welding T joint on SMA490BW steel[J]. Electric Welding Machine, 44, 158-163(2014).

[3] Wang Z J, Xu G J, Li W H et al. Fiber-laser-MAG hybrid welding process of 14-mm thick EH36 high strength steels and joint performances[J]. Chinese Journal of Lasers, 45, 1002007(2018).

[4] Tao C Q, Wu X Y, Wang Q Y et al. Comparative study for laser-MAG hybrid welding and MAG welding of SMA490BW weather-resistance steel[J]. Electric Welding Machine, 44, 35-39(2014).

[5] Li H Y, Tan C W, Zhang Q et al. Effect of heat source order on coupling mechanism and mechanical properties of joints in laser-arc hybrid welding of HG785D high-strength steels[J]. Chinese Journal of Lasers, 45, 0502006(2018).

[6] Wu Y S, Zhang Z Y, He Y P et al. Study on microstructure and mechanical properties of SMA490BW weathering steel welded joints at low temperature[J]. Hot Working Technology, 45, 51-54(2016).

[7] Wu X Y, Zhang Z Y, Liu Y J et al. Study on mechanical properties of SMA490BW steel welded joint in bullet train at low temperatures[J]. Hot Working Technology, 44, 29-31, 35(2015).

[8] Rong H. Research of laser-mag hybrid arc welding process on weathering resistant steel SMA490BW[D]. Chengdu: Southwest Jiaotong University(2015).

[9] Chen R, Jiang P, Shao X Y et al. Improvement of low-temperature impact toughness for 304 weld joint produced by laser-MIG hybrid welding under magnetic field[J]. Journal of Materials Processing Technology, 247, 306-314(2017). http://www.sciencedirect.com/science/article/pii/S0924013617301322

[10] He Y P. Research on the low-temperature performance of S355J2W steel welded joints[D]. Chengdu: Southwest Jiaotong University(2017).

[11] Standardization Administration. General Administration of Quality Supervision, Inspection, Quarantine of the People's Republic of China, (2014).

[12] Díaz-Fuentes M, Iza-Mendia A, Gutiérrez I. Analysis of different acicular ferrite microstructures in low-carbon steels by electron backscattered diffraction. Study of their toughness behavior[J]. Metallurgical and Materials Transactions A, 34, 2505-2516(2003). http://link.springer.com/article/10.1007/s11661-003-0010-7

[14] Song R, Ponge D, Raabe D. Mechanical properties of an ultrafine grained C-Mn steel processed by warm deformation and annealing[J]. Acta Materialia, 53, 4881-4892(2005). http://www.sciencedirect.com/science/article/pii/S135964540500409X

[15] Wang W, Shan Y Y, Yang K. Study of high strength pipeline steels with different microstructures[J]. Materials Science and Engineering: A, 502, 38-44(2009). http://www.sciencedirect.com/science/article/pii/S0921509308012409