电焊机2025，Vol.55Issue(7)：79-88,10.DOI:10.7512/j.issn.1001-2303.2025.07.08
核电平板滤网2507超级双相不锈钢焊接工艺
Research on the Welding Process of 2507 Super Duplex Stainless Steel in the Flat Screen Filter Equipment of Nuclear Power Plants
徐杰 1丁跃华 1徐耀 1刘红 1方圆 1林丽花 1顾陆军 1沙凯丰1
作者信息
- 1. 江苏电力装备有限公司,江苏 常州 213012
- 折叠
摘要
Abstract
This study investigates the welding process of 2507 super duplex stainless steel,a critical material for flat screen filter equipment in the cold source water intake interception and cleaning circulation system of a CAP1000 third-generation passive pressurized water reactor nuclear power unit(1,000 MW class)in China.The performance of welded joints was com-prehensively evaluated through tensile testing,bend testing,intergranular corrosion analysis,and metallographic characteriza-tion.Experimental results demonstrate that the flux-cored arc welding with gas shielding(FCAW-G)process,employing op-timized heat inputs of 9.00 kJ/cm for the front-side root pass,9.60-11.52 kJ/cm for front-side fill passes,11.65-12.48 kJ/cm for the front-side capping pass,and 10.56 kJ/cm for the reverse-side backing pass,yields welded joints with exceptional me-chanical properties and favorable metallurgical integrity.These joints meet the stringent requirements for nuclear equipment operating in marine corrosive environments.Transverse rhombic specimens exhibited a tensile strength of 845 MPa,with fractures localized in the base material.180° transverse side-bend tests showed no surface cracking.Homogeneous dual-phase microstructure with a balanced ferrite-to-austenite phase ratio.Absence of microcracks,detrimental phase precipita-tion,or susceptibility to intergranular corrosion.The findings validate the applicability of 2507 super duplex stainless steel in critical nuclear power systems under harsh marine conditions,ensuring compliance with nuclear-grade structural material standards.关键词
核电设备/超级双相不锈钢/药芯焊丝气体保护焊接/力学性能/显微组织Key words
nuclear power plant equipment/super duplex stainless steel/flux-cored arc welding with gas shielding/mechani-cal properties/microstructure分类
矿业与冶金引用本文复制引用
徐杰,丁跃华,徐耀,刘红,方圆,林丽花,顾陆军,沙凯丰..核电平板滤网2507超级双相不锈钢焊接工艺[J].电焊机,2025,55(7):79-88,10.
