Proposal on Carbon Steel Pipe Welding
碳钢管道焊接工艺
1Technical description 技术特征
1.1Pipe material and size: 20# seamless steel pipe
材质、规格：20#无缝钢管
1.2Work medium：water
工作介质：水
1.3Designed pressure：4㎏/㎝2
设计压力：4㎏/㎝2
1.4Work pressure：4㎏/㎝2
工作压力：4㎏/㎝2
1.5Test pressure：6㎏/㎝2
试验压力：6㎏/㎝2
2Related documents to this proposal：
本工艺编制依据：
2.1Technical specification of F06B
F06B技术文件
2.2GB50236-98《Field Equipment and Industrial Pipe Welding Work Execution and Acceptance Code》
国标GB50236-98《现场设备、工业管道焊接工程施工及验收规范》
2.3GB50235-97《Industrial Metal Pipe Works Construction and
Acceptance Code》
国标GB50235-97《工业金属管道工程施工及验收规范》
2.4CEFOC Welding Technical Appraisal Report : HG3，HG2002-1
本公司焊接工艺评定报告：HG3，HG2002-1
3Welder焊工
3.1Welder should be certified in passing the Welding Examination of
Boiler Pressure Container and Pressure Pipe。
焊工应具有“锅炉压力容器压力管道焊工考试规则”规定的焊工考试合格证。
3.2 Welder should pass the qualification test by GB50236-98 Code to obtain work permit of the Contractor before starting the welding work of this project.
焊工进入现场后，应按GB50236-98规定，先进行焊接实际操作考试合格。经总包方认可发证后，方能承担本项目的焊接工作。
3.3 This technical proposal should be complied to during the welding work of this project
焊工承担本项目的焊接工作中，应切实执行本焊接工艺。
4 Welding work inspection 焊接检验
4.1 Welding inspector should be fully acquainted with the F06B technical specification and both the international standards and this proposal
焊接检验人员应F06B技术文件及相关国标和本工艺。
4.2 Inspect the pipe materials and welding materials in accordance with the relevant rules and sign the acceptance form。
对管材焊材按规定进行检验、填表验收。
4.3 Supervise the work of welder and help him to correct any defects in work. To ensure the welding work quality, the inspector is powered to stop the work of any serious offender or those who refuse to correct defects in work。
对焊工是否执行本工艺进行全面监督检查,对违反者进行教育帮助得以改正。对严重违反者或教育不改者有权令其停止焊接工作。以确保焊接质量。
4.4 Perform the inspection of welded work in line with Article 7 of this proposal
做好本工艺第7条“焊接后检查和管理工作”。
4.5 Coordinate with the representatives of Contractor and Supervisor to participate the inspection
邀请和欢迎总包或监理方检验人员进行检查。
5 Preparation work before welding：
焊前准备：
5 .1 The pipe materials and welding materials are checked to be qualified
products
管材焊材必须具有符合规定的合格证明，并与实物核对无误。
5.2 Pipe material and size: 20# seamless steel pipe
管材型号为20#无缝钢管，规格为 DN50至DN250
5.3 Welding materials 焊材
5.3.1Argon welding wire model and size: CO2 wire, ∮2.5mm ∮2.0mm
氩弧焊焊丝型号规格：CO2保护焊焊丝，∮2.5mm ∮2.0mm 5.3.2Welding rod model and size: J422 ∮3.2mm ∮2.5mm
电焊条规格型号规格：J422 ∮3.2mm ∮2.5mm
5.3.3 Ce tungsten pole model and size: WCe-20∮2.0mm
铈钨极型号规格：WCe-20∮2.0mm
5.3.4Argon purity: 99.99％。
氩气纯度为99.99％。
5.4 Welding parts preparation 焊件准备
5.4.1 The positioning of welding point should comply to GB50235-97 and GB50236-98。
焊接口的分布位置必须符合国标GB50235-97和GB50236-98规范的规定。
5.4.2 The positioning of welding point should comply to GB50235-97 and GB50236-98。
管道为V型坡口，对接接头、组对应符合图1要求：
