压力容器2025，Vol.42Issue(1)：26-33,8.DOI:10.3969/j.issn.1001-4837.2025.01.004
5%Ni低温钢MAG焊接工艺研究
Study on the MAG welding process of 5%Ni low-temperature steel
曾志伟 1金旭 2姜冬雪 2黄贺楠 1张露云 1孙家禄 1张峻巍1
作者信息
- 1. 辽宁科技大学 材料与冶金学院,辽宁 鞍山 114051
- 2. 鞍钢股份有限公司大型总厂,辽宁 鞍山 114009
- 折叠
摘要
Abstract
For 5%Ni low-temperature steel,welding experiments were carried out by means of gas metal arc welding with active gas shielding.The microstructure and fracture morphology of the joints were observed,and the hardness,tensile properties,low-temperature impact toughness and bending properties of the joints were analyzed.The results show that the welded joints are well formed,and the microstructure of the weld is austenitic dendritic crystal.The base metal is affected by the welding heat cycle to form a heat affected zone,and its microstructure is mainly composed of granular bainite,M-A components and tempered sorbite.The hardness values of the joints are ranged from 197～258 HV10 without significant hardening.The average tensile strength of the joint is 685 MPa,and the tensile fracture is near the lowest hardness point and the tensile strength is lower than that of the base material,which confirms the strength decline of the joint.The low-temperature impact toughness of the micro-region of the fusion line is the lowest,with an average value of 36 J,which is a mixed fracture mode.This is related to the coarse microstructure and the second phase particles near the fusion zone.All bending properties are qualified,indicating that the joints have good plasticity.This research in this paper has positive significance for the popularization and application of MAG welding process in the field of 5%Ni steel low temperature pressure vessel welding.关键词
5%Ni钢/MAG焊接/微观组织/低温韧性Key words
5%Ni steel/MAG welding/microstructure/low-temperature toughness分类
机械制造引用本文复制引用
曾志伟,金旭,姜冬雪,黄贺楠,张露云,孙家禄,张峻巍..5%Ni低温钢MAG焊接工艺研究[J].压力容器,2025,42(1):26-33,8.
