内外焊点相差1.5个螺距技术在螺旋缝焊管预精焊中的应用  

Application of Technique of 1.5 Spiral Space between Internal and External Welding Points to 2-step Process for Spiral Welded Pipe

作　　者：刘迟 李振金[2] 廖鹏飞[2] 陈巧明 LIU Chi;LI Zhenjin;LIAO Pengfei;CHEN Qiaoming(CNPC Tubular Goods Research Institute（TGRI）,Xi＇an 710077,China;Beijing Longshine Oil Tubular Teehnology Co.,Ltd.,Beijing 100101,China;Taxi＇nan Exploration and Exploitation Co.,Tarim Oil field Co.,Kashgar 844804,China)

机构地区：[1]中国石油集团石油管工程技术研究院,陕西西安710077 [2]北京隆盛泰科石油管科技有限公司,北京100101 [3]塔里木油田公司塔西南勘探开发公司,新疆喀什844804

出　　处：《钢管》2018年第5期24-28,共5页Steel Pipe

摘　　要：分析精焊机组内外焊点相差0.5/1.5个螺距的焊接工艺特点,根据卷板的化学成分和碳当量及硬度设计焊接工艺参数,对比焊后钢管焊缝的力学性能、宏观形貌和显微组织以及硬度。试验结果表明:内焊预热及焊接热循环对焊缝组织的影响表现在焊缝金相组织类型没有发生太大变化,但各种组织的形态、大小、数量以及原奥氏体晶粒大小有些差异。内外焊点相差1.5个螺距的焊缝夏比冲击功较0.5个螺距焊接提高约30 J,特别是对硬度影响较为明显,可以满足X70M钢级螺旋缝焊管焊缝硬度小于250 HV10的要求。Analyzed here in the essay are the technological characteristics of the final welding process associated with a 1.5 spiral space between the internal and external welding points. Based on chemical composition, carbon equivalent and hardness of the steel coil, the welding process parameters are designed. And the mechanical properties, macro morphology and micro structure, and hardness of the weld seam of the pipe as welded are compared. The test result indicates that there is little change with type of the weld seam metallurgical structure as resulting from the influence by internal weld pre-heating and welding heat cycle. However, it is observed that there are some changes in shapes, sizes and quantity of different kinds of structures as well as sizes of the original austenite grain. The Charpy impact of the weld seam with a 1.5 spiral space between the interual and the external welding points is about 30 J higher than that with a 0.5 spiral space. And in particular, the influence on hardness is rather obvious, having met the specified requirement that weld seam hardness of the X70M HSAW pipe should be less than 250 HVIO.

关 键 词：焊管 螺旋缝 预精焊 焊点 1.5个螺距技术 应用 

分 类 号：TG335.75[金属学及工艺—金属压力加工]