| 河北石油职业技术学院，河北 廊坊 065000
关键词： 管线钢；对接接头；焊接工艺；坡口设计
针对不同强度级别的管线钢X70和L245对接的焊接工艺进行了研究。通过碳当量计算和金相组织观察，分析了钢材焊接性；确定出预热和层间温度；选择了焊接材料；并进行了坡口设计。同时根据Q/SY XQ18—2002和XQ-CS-JX-SPE-0010标准对所制定的焊接工艺进行了评定。经评定，管口外观检查和射线检测合格，金相组织、拉伸试验、冲击试验等各项性能指标优良。按照该工艺施工的焊接接头质量合格，完全满足施工的技术要求。
Study of the Welding Procedure for X70-L245 Butt Joint of Pipeline SteelZHANG Yuzhi，L Xiangyang，MA Yanchang，SUN Dexin (Hebei Technical College of Petroleum Profession，Langfang 065000，China)
Abstract： A study was made of the welding procedure for X70-L245 butt joint of pipeline steel.The weldability of steel was analyzed by Ceq and macrostructure，etc.Preheat and interpass temperautre were established. Joint design has been made.Visual examinations and X-ray and destructive tests were conducted in accordance with Q/SY XQ18—2002 and XQ-CS-JY-SPE-0010 standards after the completion of welding，so the result of every item meets the requirements of the relevant standards.And the results of macrostructure，the tension test and the charpy V notch test are good，the welding joint is very safe.
Key words： pipeline steel；butt joint；joint procedure;bevel design
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