| 电铁塔用细晶高强钢焊接接头组织与性能研究 |
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| 引用本文： | 杜宝帅,张忠文,李新梅,邹勇.电铁塔用细晶高强钢焊接接头组织与性能研究[J].电焊机,2011,41(12):39-43. |
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| 作者姓名： | 杜宝帅 张忠文 李新梅 邹勇 |
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| 作者单位： | 1. 山东电力研究院,山东 济南,250002
2. 山东大学 材料液固结构演变与加工教育部重点实验室,山东 济南,250061 |
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| 摘 要： | 采用焊条电孤焊、CO2气体保护焊焊接了控扎控冷制备输电铁塔用细晶Q420低合金高强钢.研究焊接接头显微组织和力学性能,并对比分析热轧制备Q420钢焊接接头的冲击韧性.研究结果表明,选择E5515焊条、ER55-G焊丝焊接所得细晶Q420高强钢焊接接头焊缝金属主要由铁素体和少量珠光体构成,ER55-G焊丝由于添加Ti元素...
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| 关 键 词： | 细晶钢 焊接 显微组织 力学性能 |
Research on welding joint microstructure and properties of fine-grained high strength steel for electric transmission tower |
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| DU Bao-shuai
,
ZHANG Zhong-wen
,
LI Xin-mei
,
ZOU Yong.Research on welding joint microstructure and properties of fine-grained high strength steel for electric transmission tower[J].Electric Welding Machine,2011,41(12):39-43. |
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| Authors: | DU Bao-shuai ZHANG Zhong-wen LI Xin-mei ZOU Yong |
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| Affiliation: | 1.Shandong Electric Power Research Institute,Ji’nan 250002,China;2.Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education),Shandong University,Ji’nan 250061,China) |
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| Abstract: | Ultra-fine grained Q420 steel manufactured by TMCP was welded by means of shielded metal arc welding and CO2 gas metal arc welding.Microstructure and mechanical properties of the welded joint were investigated,and impact toughness of hot rolled Q420 steel joint was also analyzed.Results show that using E5515 electrode and ER55-G welding wire,weld metal consists of ferrite and pearlite with little amount.The presence of acicular ferrite in the weld metal fabricated by ER55-G welding wire is attributed to the addition of Ti in it.Tensile test showed that the specimen fractured at the base metal,indicating the strength of the weld metal is higher than that of the base metal.Microhardness of the weld metal is higher than that of the base metal and soft phenomenon was not observed for the HAZ of the welded joint.In comparison to Q420 steel fabricated by hot rolling,welded joint of fine-grained steel shows high toughness and thus it is more suitable for being used for electric transmission tower that requires high impact toughness at low temperature. |
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| Keywords: | fine-grained steel welding microstructure mechanical properties |
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