管道全位置下向焊焊接技术在封堵作业中的应用

通过管道全位置下向焊焊接技术在管道封堵焊接中的应用，分析管道全位置下向焊工艺的特点，提出在管道封堵动火管线碰口连头作业环节中，管道坡口形式和组对要求、焊条选择、焊接电流选择的标准，重点研究在焊接过程中根焊、热焊、填充焊和盖面焊时的焊接规范和焊接操作要求，并分析产生缺陷的原因，提出避免产生缺陷的工艺措施。实践证明：在管道封诸作业中，管道全位置下向焊工艺是一种有效的焊接方法。

Appliance of the Pipeline All-position Vertical Down Welding Technology to the Pipeline Plugging

By applying of the pipeline all-position downward welding technology in the pipeline stopper welding,the paper analyzes the characteristic of the pipeline all-position downward welding technology and puts forward the standards for pipeline groove forms,butt joint requirements,electrode selection and current welding selection in pipeline stopper hot work pipeline connections by the tie-in technique.It focuses its study on the welding standards and operation requirements of the root welding,heat welding,fille...