摘要
Abstract
This article is mainly for the P91/P92 steel installation with the problems:Before installing,testing F91/P92 base metal hardness is low,the face groove has layered folding phenomenon;and during the equipment operation,micro-cracks of the welding seam on the surface appeared;during the welding process,the preheating temperature is insufficient lead to root crack,argon filling adverse roots oxidation slag,improper operation caused interlayer crack; too thick monolayer weld caused weld impact toughness reduced,part reworking without making heat treatment produced cracks;the improper operations, such as post-weld heat treatment, thermocouple connection and heating stage of the heat treatment, caused hardness over-proof; In the detection phase, ultrasonic testing of defects missed during the detection phase. In response to these problems, hardness testing, weld seam of nondestructive detection with magnetic particle sampling should be enhanced in the installation before pipe welding;during installation, noted the process control, including filling argon, arc stopping,welding line energy and heat treatment;installation is complete, ultrasonic testing should pay attention to the characteristics of P92 steel. After analyzed and summarized,to do the installation and construction of the similar situation by a signed,in order to avoid detours,reduce the occurrence of similar defects and accidents.关键词
P91/P92钢/超超临界机组/焊接质量控制Key words
P91/P92 steel/the ultra super critical steam turbine/quality control分类
矿业与冶金
