双金属复合管全自动TT对接焊工艺研究

Study on Automatic TT Butt Welding Process for Lined Pipe

采用全自动TIP TIG焊对规格为准168.3 mm×(12.7+3)mm的双金属复合管进行对接焊工艺研究,包括坡口设计、管道的组对、背面保护及全位置焊接等。焊接完成后对焊缝进行外观检验、X射线无损检测、力学性能试验及金相组织分析。结果表明,焊缝外观成型良好,无损检测均为Ⅰ级,力学性能达到标准要求。

The butt welding specification was studied by TIP TIG process for lined pipe which size is 准168.3 mm ×（12.7＋3） mm, including groove design, fit-up, back protection and all-position welding. The visual inspection, X-ray non-destructive testing, mechanical properties and microstructure of the samples after welding were tested. The test results of the samples can meet the requirements of standards.