Q/CNPC中国石油天然气集团公司企业标准Q/CNPC78-2002管道下向焊接工艺规程Weldingproceduresforverticaldownstickweldingofpipes2002一07一08发布2002一07一08实施中国石油天然气集团公司发布Q/CNPC78-2002目次一前言⋯1范围规范性引用文件67899.19.210焊接材料保管及焊前处理·········，·······，····················································⋯⋯“‘’‘’‘”’一2焊接设备····································，·································································⋯⋯2焊接工艺评定及焊工考核·············，，·，··..................·······，········，················，，········⋯⋯2焊接·，·，·····‘·································，··············，·······‘·······，，·······························⋯⋯2焊前准备·················。···············，··················，·············································⋯⋯2焊接施工·································································································⋯⋯246焊缝检验及缺陷返修··················一’““““’‘’‘’‘’“““‘”‘””附录A(规范性附录)常用国内外钢管的化学成分和力学性能··，··⋯⋯附录B(规范性附录)下向焊条选用条件················，···············⋯⋯Q/CNPC78-2002前言本标准是在SY/I'4071-93《管道下向焊接工艺规程》的基础上，经标准编制人员广泛的调查研究，总结多年来石油行业管道下向焊接方面的经验，并结合当前管道焊接技术的现状，经过补充和反复修改而成。本标准附录A和附录B都为规范性的附录。本标准由中国石油天然气集团公司质量安全与环保部提出。本...
