longitudinally welded

基本解释

In this paper, several problems in the production and application of ERW longitudinally welded casing are discussed.
ERW直缝焊套管已在我国广泛使用，本文结合生产及使用中发现的间题浅谈几点看法。
The rapid analysis method of welding quality, acid washing test, for the longitudinally high frequency welded pipe is introduced.
介绍了一种快速分析高频直缝焊管焊接质量的方法——酸洗试验。
Furthermore, to meet the needs from market, it is helpful to reconstruct the existing longitudinally welded tubing mill in our country.
为满足市场对复合管的需求，对于我国直缝焊管机组改造有借鉴作用。