| 中国石油天然气集团公司管道焊接培训中心，河北 廊坊 065000
关键词： 焊丝；预热；下向焊
针对X70管线钢进行了焊接性分析，确定其预热温度。通过合理的接头设计，恰当的焊接工艺参数，来控制焊接热输入，确保接头的性能，并依据API1104标准对所制定的焊接工艺进行评定，取得了满意的效果。通过此工艺施工的焊接接头具有较高的安全性。
Study on Welding Technology of X70 Steel Used for Natural Gas Pipeline
ZHANG Yu-zhi，TAN Yong-dong，LU Xiang-yang
（Pipeline Welding Training Center of China National Petroleum Corporation，Langfang 065000，China）
Abstract： Analyzed the weld ability of X70 pipeline steel，determined the pre-heating temperature to prevent delayed crack，assured the capability of welding joint through choosing excellent joint design and welding parameters. Then，made the visual examination and xray test and destructive test according to API1104 standard after finishing welding，every item results meet the requirements of the relevant standards.The welding Joints are very safe.
Key Words： Welding Wire；Preheating；Down Hill Welding
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