外加厚油管 meaning in Chinese

external upset tubing
external-upset tubing
tubing with external upset ends

Outer thickening oil tube has been applied popular in the petrol production with the problem of many product
摘要外加厚油管在国内外石油生产中应用比较广泛。
In order to decrease the cost , disabled tube has been classified in upset forging repair technology , which produces a good economical benefit
但外加厚油管加工生产中，废残品较多，为降低成本，我厂对废油管进行了分类，并采用再镦锻工艺修复，取得了良好的经济效果。