冷箱内铝合金及管道焊接工艺要求standard

1、梅塞尔中国工程规范ProjectCodeofMesserChina铝合金及管道焊接工艺要求THESTANDARDOFWELDINGPROCEDUREOFALUMINIUMALLOYANDPIPELINES编制：于文盛日期：MadebyWenshengYuDate校对：日期：CheckedbyDate批准：日期：ApprovedbyZhanglongDaiDateCodeofPractice 编号（No.）:COP-0405 版本（Version）:A1目的Purpose规范冷箱内铝合金及管道焊接（TIG）工艺操作技术要求及焊接作业指导书的规定。Tostandardizetheon-sitema

2、nualofAluminiumAlloyandpipelineinCoolBox.2焊前准备WeldingPreparation:2.1焊件坡口形式和尺寸应符合设计和焊接作业指导书的规定，坡口加工表面应进行清理，并达到平整光滑，无毛刺和飞边、垫板及焊丝进行清理。Theshapeandthesizeofthegrooveoftheweldingpiecesshallbefollowedthedesignedrulesandweldingoperativemanual.Thesurfaceofthegrooveprocessshallbecleaned,levelwithoutburrsandov

3、erlaps,thewasherandwiresshallalsobecleaned.2.2焊件组对中，焊接定位焊缝时，应采用与正式焊接相同的焊丝和焊接工艺并应由合格焊工施焊，定位焊缝的长度，间距和高度宜符合焊接作业指导书，正式焊接前应对定位焊缝进行检查，当发现缺陷时，应及时处理。Theselectionofthewiresandweldingprocedureshallbethesameastheweldingoperatedbyqualifiedweldersintheprocessoftackweldingforfittinguptheweldingpieces.Thelength,sp

4、aceandheightofthetackweldingseamshallfollowtheweldingmanual,Thetackingweldingseamshallbeinspectedandthedefectsshallbedealtwithpriortothewelding.2.3当焊缝背面需加垫板时，垫板材质应符合设计规定或与母材相同，开有容纳焊缝根部的沟槽。Whenthebackoftheweldingseamneedstopluswasher,thematerialsofthewasherwithslotsopenedintherootoftheweldingseamshal

5、lfollowthedesignedrulesorthesamenesstothebasematerials.2.4管道的对接焊缝内壁应齐平，内壁错边量应符合下例规定：Thebuttjointsofthewalloftheweldingseamshallbeleveled:壁厚内壁错边量wallthicknessedgeerror05mm5mm0.16且8mm 时复盖层可用单人焊接。特别注意：定位焊后塔体可能引起的垂直度及塔板水平度变化确定，即利用焊后变形进一步矫正垂直度及水平度。Alltheweldingshallbetakenashorizontalweldingonbothsidesby

6、twoweldersaccordingtothetackwelding,whentheBisnotlessthan8mm,thecoveredpassescanbeusedbysinglewelding.SpecialAttention:Thecolumnmaycausethechangeofverticalityorthelevelofthetowerwasherinthecompletionoftackwelding.Thedistortionafterweldingshallberectifiedabouttheverticalityandlevel.6.2在冷箱内各容器管口接管前需要用

7、干净的白布或塑料布扎口，以免油脂及污物进入，对冷凝蒸发器内施焊时，严禁火焰或电弧击伤容器及管道表面。工件焊接时，电缆搭铁（二次线）不允许随意乱搭在工件上，应做专用工具，不允许在管道上引弧。Inordertoavoidgreasesandfeculencesbeingentered,eachnozzleofvesselintheicechestshallbecleanedandbefastenedbycleancalicoandplasticcloth,thesurfaceofthevessel&pipelinesshallbeforbiddenhurtingbyflameandelec

8、tricarcintheprocessofweldinginthecondensativeevaporator.Thecablejointwithironofearthwiresisnotallowedtobebuiltontheworkpiecesatwillintheprocessofweldingworkpieces,thespecialinstrumentshallbemade,andthearcburningisnotallowableonthepipelines.7现场铝合金塔塔体环焊缝的焊接Thecircularweldingofthecolumnofaluminiumalloy

9、toweronsite7.1担任塔体环焊缝焊接的焊工应按本标准规定要求经考试合格持证上岗。Theweldersofannularweldingofthetowershallpasstheexamandbecertificate-carriedaccordingwiththestandardregulation.7.2环焊缝处横焊位置，焊工应按“双面横焊”要求进行操作技能的考试，考试用材的牌号，规格应与实际产品一致。Thepositionofhorizontalweldingintheannularweldingseam,theweldershallbepassedtheoperativeski

10、llsexamineaccordingtotherequirementsofhorizontalweldingonbothsides.Thebrandandspecificationsofmaterialsshallbeidenticaltothefactualproducts.7.3立装塔环焊缝焊接工艺：Theweldingprocedurefortheannularweldingseamofverticalinstallingtower:7.3.1焊接方法：双人双面同时横焊，当壁厚10mm 时，坡口侧采用单人单面横焊加复盖层；WeldingProcedure:Whenthewallthic

11、knessisnotlessthan10mm,twoweldersweldonbothsidesatsametime.Otherwise,onesideofgrooveshalladoptthehorizontalweldingandaddcapping.7.3.2预热温度：Preheattemperature:壁厚10mm 时预热100cWallthickness10mm 时预热150cWallthickness10mm,Preheatis150C7.4注意事项Attention7.4.1焊接环境：雨天或环境相对湿度90%时不得施焊。Weldingcondition:Theweldingis

12、forbiddenunderthecircumstanceofrainydaysortherelativehumidityisnotlessthan90%.7.4.2坡口加工采取机械方法，并确保组对，定位焊时有足够的，均匀的间隙。Theprocessofgrooveissuggestedtoadoptingmechanicproceduresandensurethefittingupwithenoughandsymmetricalclearanceintheprocessofwelding.7.4.3塔环焊缝正式施焊开始后，中途焊接中断时间不得超过 15 分钟。Afterthebeginnin

13、gannularweldingoftower,thestoppagetimeintheprocessofweldingshallnotbeover15minutes.7.4.4进入塔内前应检查容器内含 N2 量，防止因塔内含 N2 封气而引起人员窒息。Thecontentofnitrogeninthevesselshallbeinspectedpriortoenterthetower.7.4.5焊接时用于氧乙焕气焊枪预热时，应在塔外侧预热，并避开坡口区。Preheatingbyoxy-acetyleneweldingtorchintheprocessofweldingshallpreheato

14、utsideoftowerandavoidthegroovearea.7.4.6双面双人同时横焊及单人单面复盖焊时应选择合理的焊接顺序，保证塔体的直垂度。Theselectionofweldingordershallbereasonableandensuretheverticalityoftowerinprocessofweldingbytwoweldersonbothsidesandcoverweldingononeside.7.4.7应尽量设法缩短 tC 气管，为此可将 tC 气瓶放在接近施焊区域的平台上。Theargongascylindersshallbelaidontheflatro

15、ofadjacencytotheflatroofsoastotryefforttobeshortenedtheargongaspipeline.7.4.8进入冷箱前应严格检查焊接电缆及接地线是否绝缘，杜绝焊钳与容器及铝合金管道接触造成短路。Whethertheweldingcablesandgroundinglinesareinsulatedshallbestrictlyinspectedpriortotheentranceofcoolbox,thevesselsandthepipelinesofaluminumalloyareforbidden.7.4.9冷箱内钢结构及管托支架的焊缝，必须采

16、用不锈钢焊条进行焊接。Theweldingseamofthestructurewithinthesteelofcoolboxandpipelinebracketshouldadoptstainlesssteelweldingrodtowelding.7.4.10冷箱内管架的焊接及冷箱焊接：Theweldingofthebracketofpipelinesintheicechestandweldingoficechest:要保证管架、托架各焊缝有足够的强度和稳定性，整个冷箱外的连续焊必需保证冷箱的气密性要求。Theweldingseamofthebracketandthebracketofpipelinesshallensuretohaveenoughintensityandstability,thesequentweldingoutsidetheicechests