管道与一般容器的焊接不同,只能单面焊,不能从里面清焊根,且往往是固定口全位置焊接,操作技术较难。特别是石油和化工生产中的高压管道,工作压力高,工作温度范围广,因而对它的焊接质量要求非常严格。 Pipelines and general container of different welding, only single-sided welding, welding root can not be removed from the inside, and often all-position fixed-position welding, operating technology more difficult. In particular, high-pressure pipes used in the production of petroleum and chemical products have high working pressure and a wide range of operating temperatures, and therefore require very strict welding quality.