对接环焊缝白点产生原因  

Causes of white dots in butt girth weld

作　　者：罗华权 刘文红 张益铭 张雪琴 杨力能 刘养勤 LUO Huaquan;LIU Wenhong;ZHANG Yiming;ZHANG Xueqin;YANG Lineng;LIU Yangqin(CNPC Tubular Goods Research Institute,Xi’an 710077,China)

机构地区：[1]中国石油集团工程材料研究院有限公司,西安710077

出　　处：《理化检验（物理分册）》2023年第9期47-50,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某钢管对接环焊缝处产生白点缺陷。采用宏观观察、力学性能测试、金相检验、扫描电镜及能谱分析等方法对白点产生的原因进行研究。结果表明:焊接前,焊缝坡口未进行充分干燥,焊缝中氢离子含量过高,导致氢离子聚集并产生了白点;焊接操作不当导致非金属夹杂物未及时析出,在白点内部产生了非金属夹杂物。The white dot defect occurred at the butt girth weld of a certain steel pipe.The causes of white dots were studied by macroscopic observation,mechanical property testing,metallographic examination,scanning electron microscopy and energy spectrum analysis.The results show that before welding,the weld groove was not fully dried and the hydrogen ion content in the weld was too high,led to the aggregation of hydrogen ions and the formation of white dots.Improper welding operation resulted in non-metallic inclusions not precipitated in time and non-metallic inclusions were generated inside the white dots.

关 键 词：对接环焊缝 白点 氢脆 非金属夹杂物 

分 类 号：TB31[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—物理冶金]