L415材质管道现场焊接裂纹分析与控制
Analysis and Control of Field Welding Cracks in L415 Steel Pipeline Construction
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- DOI:
- 作者:
- 张宏兴, 李怀新, 刘天江
ZHANG Hong-xing
- 作者单位:
- 南堡油田海洋工程项目经理部, 河北唐海 063200
Offshore Engineering Project Management Division of Nanpu Oilfield,Tanghai 063200,China
- 关键词:
- 管道焊接;裂纹;控制
pipeline welding;crack;control
- 摘要:
- L415材质的管道钢广泛应用于大口径长输管道中,管道焊接是在瞬间的高温作用下,伴有复杂冶金过程的一个物理变化和化学反应过程,由于L415材质具有一定的淬硬性,焊接施工时如果措施不得当,在应力和扩散氢的作用下焊缝会产生裂纹,严重影响施工质量和速度。文章通过对焊缝裂纹形式、母材材质、焊接施工工艺和现场环境等的分析,查找出现裂纹的原因,采取焊前预热、提高组对质量等预防措施和焊缝返修保障措施,有效地控制了焊接裂纹的产生。
L415 material of steel is widely used in large diameter long-distance pipelines. Welding is an effect of high temperature for an instant, accompanied by the metallurgical complex process of physical change and chemical reaction. Due to its having a certain degree of hardenability, if welding construction measures taken are not proper, the diffusible hydrogen and stress will cause weld cracks so as to make severe impact on the quality and speed of construction. Through the analyses of weld crack forms，base metal materials, construction technology and welding on-site environment, the causes of the cracks are found. By taking the preventive measures （such as preheating prior to welding and improving butt quality） and the weld repair guarantee measure, welding cracks are effectively controlled.2008,6(6): 56-59 收稿日期：2008-5-30分类号：TG441.7作者简介：张宏兴（1979-），男，辽宁朝阳人，助理工程师，2001 年毕业于承德石油高等专科学校，现从事海洋平台建设管理工作。参考文献：
[1] 尹士科. 焊接材料手册[M]. 北京：中国标准出版社，2000.
[2] 陈祝年. 焊接工程师手册[M]. 北京:机械工业出版社，2002.