碳钢管道焊接工艺

1、Proposal on Carbon Steel Pipe Welding 碳钢管道焊接工艺1 Technical description 技术特征1.1 Pipe material and size: 20# seamless steel pipe材质、规格： 20#无缝钢管 1.2 Work medium： water工作介质： 水1.3 Designed pressure：4/2设计压力： 4/21.4 Work pressure：4/2工作压力：4/21.5 Test pressure：6/2试验压力：6/22 Related documents to this proposal：本工

2、艺编制依据：2.1 Technical specification of F06B F06B技术文件2.2 GB50236-98Field 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2.3 GB50235-97Industrial 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2.4 CEFOC Welding Technic

3、al Appraisal Report : HG3，HG2002-1 本公司焊接工艺评定报告：HG3，HG2002-13 Welder焊工3.1 Welder 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 perm

4、it 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 sh

5、ould 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 w

6、ork 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

7、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 q

8、ualified 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DN2505.3 Welding materials 焊材 Argon 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 Welding rod model and size: J422 3.2mm 2.5mm电焊条规格型号规格：J422 3.2mm

9、2.5mm Ce tungsten pole model and size: WCe-202.0mm 铈钨极型号规格：WCe-202.0mm Argon purity: 99.99。氩气纯度为99.99。5.4 Welding parts preparation 焊件准备 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。 The positioning of welding point should compl

10、y 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：Note: The clearance of 3.54mm is for welding. When making spot welding, the clearance should be bigger 注：间隙3.54mm为焊接时的数据，组对点固焊时，应适当大于此数据，以补收缩。图1.焊口组对数据 The groove of welding parts should be processed by grinding machine and cleaned within 10mm of

11、 both inside and outside surface from any oil, dust and burr 焊件坡口应用机械或磨光机加工。焊口组对前应将坡口及其内外表面10mm范围内的油、垢、毛刺等清理干净。 Penetration welding must be applied in spot weld and 4 spots with 5mm of each should be welded on pipe with diameter 150mm and 6 spots with 5mm of each should be welded on pipe with diamet

12、er 150mm. 点固焊，根部必须焊透。不得有焊接缺陷。管径150mm为4点，每点长度为5mm。管径150mm为6点，每点长度为5mm。 The connection of pipe should keep straight in axel and if necessary, make measurement as the flowing chart from 200mm to the center of welding point. The differential allowance is 1mm to pipe with diameter 100mm and 2mm to pipe w

13、ith diameter 100mm. The differential allowance to the full length of pipe should be within 10mm and if exceeding that rate, cold correction should be applied instead of hot correction.。管子组对焊口时应保持其轴线平直。在不得以时，距焊口中心200mm处测量平直度如图2所示，管径100mm时允许偏差为1mm；管径100mm时允许偏差为2mm，但全长允许偏差均不大于10mm。万一超差时，只能用冷矫正，严禁加热矫正。图

14、 2 管道对口平直度 The pipes inside wall should keep smooth when making pipes joint. The differential allowance should be within 10% of the thickness of pipe wall. The non penetrated welding as A of the following chart is not allowed. 管道组对应内壁齐平，万不得以时，错边量不宜超过壁厚10，且大于2mm。焊接时不准有图3a之未焊透。 A non penetration B pen

15、etrationa 未焊透 b 焊透图 3 焊件错边焊口 No pressure joint of pipes管道连接时，不得用强力组对焊口。6 Welding： 焊接6.1 The welding equipment must be functioning well.焊接设备性能完好.例如:交流弧焊机应有适当的空载电压;焊接电流调节灵活。氩弧焊机必须具备非接触引弧、提前送气、迟后关气和焊接电流衰减下破功能。6.2 Welding method and parameter：焊接方法及焊接工艺参数： When pipe diameter 50, use gas welding(oxygen-ac

16、etylene welding)with the parameter as the following table: 管径50mm采用气焊（氧气乙炔焊接），焊接工艺如下：When pipe wall thickness>3mm,groove must to be made, and the groove angle is 650 ，there must not be layer of oxide on the surface of groove.² 当管材壁厚>3mm时，需倒焊接坡口，坡口角度为650，坡口表面不得有氧化层； When pipe wall thicknes

17、s3mm, the space between the two parts should be 2.5-3mm.² 当管材壁厚3mm时焊接管材对口出留出.至mm的焊接缝隙。The material of weld wire is H08Mn2Si,the diameter of weld wire should be 2.5mm.² 焊丝材料牌号为ni，焊丝直径为.mm。There should be 2 passes or 3 passes according to the thickness of the pipe wall.² 根据管材的壁厚分别为遍或遍成活

18、。The layer of oxide must be removed before the next pass.² 每进行下一遍焊接实施前，需用钢丝刷将上一遍焊接表面的氧化层刷去。 When 50mmpipe diameter133mm, use argon weld for prime welding and arc weld for cover welding. Refer to the following table: 50mm管径133mm采用氩弧焊打底，焊条电弧焊盖面。焊接工艺参数如表2：Welding layer焊接层次Welding material焊材Electri

19、city 电特性Weld current焊接电流(A)nozzle size喷嘴口径(mm)Argon consume (L/Minute)焊枪用氩量(升/分)Model型号Size 规格(mm)Power电源Polarity极性1H08Mn2Si2.5DC 直流Positive正接80-100882J4222.5DC 直流Positive正接55-70AC 交流管径133mm采用氩弧焊接打底，焊条电流焊盖面。焊接工艺参数如表3Welding layer焊接层次Welding materia焊材Electricity 电特性Weld current焊接电流(A)nozzle size喷嘴口径(

20、mm)Argon consume (L/Minute)焊枪用氩量(升/分)Model型号Size 规格(mm)Power电源Polarity极性1H08Mn2Si2.5DC 直流Positive正接90-105882J4223.2DC直流negative反接90-115AC 交流6.3 When pipe diameter133mm, use argon weld for prime welding and arc weld for cover welding. Refer to the following table:阿斯线要接紧在近焊接点，不论氩弧焊还是焊条电弧焊，都必须在坡口内引弧。防止

21、焊件电弧击伤。6.4 fter the argon prime welding, the welded seam must be cleaned by steel brush and be checked of its quality. Then cover welding by arc weld. 第一层氩弧焊打底焊缝焊完后，必须用钢丝刷将焊缝表面刷干净。检查合格后，再用焊条电弧焊焊接第二层（盖面层）6.5 Upon completion of welding, make cleaning of welded seam surface, marking the welder No. on p

22、ipe and sign the welding record for quality inspector to perform checking 焊口焊接完毕后，应清除焊渣及飞溅物。将焊缝表面刷干净进行自检合格后。做好焊工钢印号标记。填写焊接记录。交检验员检验确认。6.6 Quality requirement to welded seam：对焊缝的质量要求： The seam surface should not have: crack, air hole, dregs or non penetration welding The inner surface of seam should

23、be fully penetration welded 焊缝表面不得有：裂纹、气孔、夹渣、未焊透。咬边深度0.5，且0.5 mm连续长度100mm，且两侧咬边总长10焊缝全长。焊缝内表面为全焊透。 The height of outer surface of seam is 0-3mm（0-4mm to overhead welding）and uniform. The outer surface width of seam is（-1）×1.2clearance width×2。焊缝外表面高度0-3mm（仰焊可放宽到0-4mm）应力求均匀。焊缝外表宽度（-1）×

24、×2。7 Welding inspection 焊接后检查和管理工作。7.1 Quality inspector would conduct the following checking of the welded work：焊工焊完焊口后。检验员应及时进行检查： Check the outer surface quality of welded seam in accordance with the requirement in 6.6 above按本工艺6.6条要求检查焊缝外表质量。 Check the mark made by the welder检查焊工标记钢印号。 Check the welding record, put the serial No. of welded joint and inspection resu