秦山核电二期扩建工程不锈钢厚壁管的焊接施工技术

The welding technique of thick-walled stainless steel pipes in Qinshan Ⅱ expansion project

从焊前准备、产品焊接以及焊接过程中焊接应力、焊接变形的控制等方面,系统地介绍了秦山核电二期扩建工程不锈钢厚壁管的焊接技术。针对安装过程中出现的各类影响焊接质量的主要因素进行了系统的分析,提出解决焊接变形、错边变形、加工坡口不均匀等质量问题的办法,采用合理的焊接顺序、焊接见证件管理技术及模拟焊接技术和局部挖补促进应力分布,可有效保证焊接质量,从而更好地促进厚壁管焊接技术的发展。

The paper introduces the welding techniques of thick-walled stainless steel pipes in Qinshan Ⅱ Expansion Project,which also analyses the main factors affected the weld quality in installation process,and introduces the control methods in preparation period before welding,welding products as well as welding distortion and welding stress.The article proposes solutions to quality problems of welding deformation,dislocating distortion,and lack of groove uniformity.By adopting rational welding sequence,witness point management technique,welding simulation technique,and stress distribution promotion by local patching,the welding quality can be warranted,so as to promote the development of thick-walled pipe welding technique.