电焊机2017，Vol.47Issue(12)：73-77,5.DOI:10.7512/j.issn.1001-2303.2017.12.16
管式褐煤干燥机低温环境下端板焊缝缺陷的安全评定
Safe assessment for weld defect of end plates of tubular lignite drying machine at low temperature
王晶1
作者信息
- 1. 承德石油高等专科学校工业技术中心,河北承德067000
- 折叠
摘要
Abstract
The low alloy steel Q370R used for end plates of tubular lignite drying machine in our country is welded by shielded metal arc welding for backing welding and automatic submerged arc welding for filling and cosmetic welding.Meanwhile,the mechanical properties and fracture toughness of weld metal at low temperature are tested.With given maximum working pressure,the outer surface cracks in the welds of welded joints at low temperature are assessed by the national standard GB/T19624-2004 (Safety assessment for in-service pressure vessels containing defect).The results show that assessment point locates within the failure line of simplified assessment but outside the failure line of traditional assessment,and the size of equivalent crack is larger than that of the maximum tolerable equivalent crack,the crack is not acceptable,the structure is unsafe and must be repaired.This study lays the foundation of the application of GB/T19624-2004 for the safety assessment of Q370R steel structure.关键词
低温/GB/T 19624-2004/焊缝缺陷/失效评定图/安全评定Key words
low temperature/GB/T19624-2004/weld defect/failure assessment diagram/safety assessment分类
矿业与冶金引用本文复制引用
王晶..管式褐煤干燥机低温环境下端板焊缝缺陷的安全评定[J].电焊机,2017,47(12):73-77,5.
