摘要
俄罗斯亚马尔LNG项目,具有代表性的工艺管道采用低温碳钢管道材料ASTM A333 Gr.6(设计温度为-50℃)以及不锈钢材料ASTM A312/A358 TP304/304L(设计温度为-196℃)。焊接技术规格书要求管道根焊必须采用氩弧焊(TIG)的焊接方法。项目采用在青岛预制、俄罗斯组装的建造模式,对精度要求高。简要介绍了项目背景和全自动TIG焊焊接方法的特点,分析了工艺管道材料的焊接性,详细论述了工艺管道焊接工艺评定,包括焊接方法设计、焊接工艺参数、焊后机械性能试验及结果分析、全自动TIG焊的优势分析等。试验表明,低温碳钢和不锈钢管道的根焊和热焊采用全自动TIG焊,焊缝性能满足LNG项目技术规格书和ASME B31.3的要求,焊接效率比常规手工TIG焊提高了2倍,提高了LNG项目工艺管道建造的质量和进度。
In Russian Yamal LNG project,the materials of typical process piping are low temperature carbon steel ASTM A333 Gr.6（design temperature of-50 ℃）and stainless steel ASTM A312/A358 TP304/304L（design temperature of-196 ℃）. The welding technical specification requires TIG for piping root welding. The project adopts the construction way of prefabrication in Qingdao and assembly in Russia,so high construction accuracy is needed. This article introduces the LNG process piping welding by automatic TIG, including welding method design, welding process parameters, weld mechanical property test and result analysis,and TIG advantage analysis as well. The root welding and hot welding of the low temperature carbon steel and stainless steel pipings adopt automatic and high efficient TIG welding,the mechanical properties of the welds meet the requirements of LNG project technical specification and code ASME B31.3. The welding efficiency by automatic TIG increases 2 times compared with conventional manual TIG welding. The quality and construction progress of the LNG project process piping are improved.
出处
《石油工程建设》
2016年第3期52-55,59,共5页
Petroleum Engineering Construction
