Twin-wire Submerged Arc Welding Process of a High-strength Low-alloy Steel
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2011年第1期
论文作者：杨秀芝
文章页码：114 - 117
摘 要：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.
杨秀芝
School of Mechanical and Electronic, Huangshi Institute of Technology
摘 要：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.
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