Twin-wire Submerged Arc Welding Process of a High-strength Low-alloy Steel

武汉理工大学学报-材料科学版(英文版), 2011, 26(1): 114-117. doi: 10.1007/s11595-011-0180-x

^1, , ^2, , ^3, , ^4,

1.School of Mechanical and Electronic, Huangshi Institute of Technology, Huangshi 435001, China

2.School of Mechanical and Electronic, Huangshi Institute of Technology, Huangshi 435001, China

3.School of Mechanical and Electronic, Huangshi Institute of Technology, Huangshi 435001, China

4.School of Mechanical and Electronic, Huangshi Institute of Technology, Huangshi 435001, China

基金项目: the Doctorate Fund of the Ministry of Education(200804870034)

Twin-wire Submerged Arc Welding Process of a High-strength Low-alloy Steel

YANG Xiuzhi ^1, , XU Qinghua ^2, , YIN Niandong ^3, , XIAO Xinhua ^4,

1.School of Mechanical and Electronic, Huangshi Institute of Technology, Huangshi 435001, China

2.School of Mechanical and Electronic, Huangshi Institute of Technology, Huangshi 435001, China

3.School of Mechanical and Electronic, Huangshi Institute of Technology, Huangshi 435001, China

4.School of Mechanical and Electronic, Huangshi Institute of Technology, Huangshi 435001, China

Keywords： twin-wire SAW

The measurement of thermal cycle curves of a high-strength low-alloy steel (HSLA)subjected twin-wire submerged arc welding (SAW) was introduced. The thermal simulation test was performed by using the obtained curves. The impact toughness at -50 ℃ temperature of the simulated samples was also tested. OM, SEM and TEM of the heat-affected zone (HAZ) of some simulation specimens were investigated. The results showed that the HSLA endured the twin-wire welding thermal cycle, generally, the low-temperature toughness values of each part of HAZ was lower than that of the parent materials, and the microstructure of coarse-grained zone(CGHAZ) mainly made up of granular bainite is the reason of the toughness serious deterioration. Coarse grain, grain boundary carbide extract and M-A island with large size and irregular polygon, along the grain boundary distribution, are the reasons for the toughness deterioration of CGHAZ. The research also showed that selected parameters of twin-wire SAW can meet the requirements to weld the test steel.

参考文献

[1]	Kishor P. Kolhe;C. K. Datta .Prediction of microstructure and mechanical properties of multipass SAW[J].Journal of Materials Processing Technology,2008(1-3):241-249.

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Twin-wire Submerged Arc Welding Process of a High-strength Low-alloy Steel

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