Domex700MC低合金高强钢药芯焊丝CO<sub>2</sub>气体保护焊焊接接头的组织与性能

Domex700MC低合金高强钢药芯焊丝CO₂气体保护焊焊接接头的组织与性能

详细信息

摘要: 用药芯焊丝CO2气体保护焊焊接Domex700MC低合金高强钢,用光学显微镜、硬度计和冲击试验机等对焊接接头的显微组织和力学性能进行了分析.结果表明:焊缝金属晶粒细小且分布均匀,有较多针状铁素体,但熔合区组织比较粗大,使熔合区附近塑性降低,为焊接接头的薄弱部位;焊缝金属显微硬度较高,为315 HV,而在热影响区为225 HV,出现软化现象;焊接接头力学性能优良,具有较高的抗拉强度(630.94 MPa)和冲击功(135.34 J).
- Domex700MC钢 /
- 药芯焊丝 /
- 显微组织 /
- 力学性能
Abstract: The Domex700MC high strength low alloy(HSLA) steel was welded by the CO2 shielded welding process with flux-cored wire.The microstructure and mechanical properties of the welded joints were analyzed by optical microscope,hardness testor and impact testing machine.The results show that the microstructure distribution of the weld metal was uniform and contained mass of acicular ferrite,but the plastic property was reduced in the heat affected zone(HAZ) because of grain growth.The micro-hardness of weld metal(315 HV) was higher than that of the other area,e.g,the micro-hardness of the HAZ was 225 HV and thus softening existed in this area.The mechanical properties of the welded joints were good,with relatively high tensile strength(630.94 MPa) and impact power(135.34 J).
- Domex700MC steel /
- flux-cored wire /
- microstructure /
- mechanical property

[1]	李亚江,王娟,刘鹏.低合金焊接及工程应用[M].北京:化学工业出版社,2003.
[2]	罗伟中.低合金高强钢焊接冷裂纹的研究[J].焊接研究与生产,1994,3(2):29-32.
[3]	章友谊,屈金山,王大春.高强钢Domex700MC焊接工艺及接头性能分析[J].电焊机,2005(12):18-19.
[4]	周岁华,史洪波,马灿时.瑞典DOMEX700MC高强度热轧钢板的性能分析[J].汽车工艺与材料,2003(8):17-19.
[5]	章友谊,屈金山,李娟.Domex700MC钢药芯焊丝CO2气体保护焊焊接接头显微组织分析[J].热加工工艺,2006,35(23):27-29.
[6]	斯重遥.焊接金相图谱[M].北京:机械工业出版社,1987.
[7]	高汉文.金相分析技术[M].上海:上海科学技术文献出版社,1987.
[8]	邹增大,李亚江,尹士科.低合金调质高强度钢焊接及工程应用[M].北京:化学工业出版社,2000.
[9]	陈伯蠡.焊接冶金原理[M].北京:清华大学出版社,1989.