船舶舱室设备底座焊接工艺规范WELDINGPROCEDURESPECIFICATIONFOREQUIPMENTBASEOFHULLCABIN1范围Scope本规范规定了船舶舱室重要设备底座焊接与普通设备底座焊接施工前的准备、人员、工艺要求、工艺过程、检验。Thespecificationrulestherequirementsofforeweldingtopreparation,personnel,technologicalrequirements,technologyprocess,examination;whichareforbaseofimportantequipmentsandcommonequipmentsofhullcabin.本规范适用于各类船舶舱室设备底座的焊接。Thespecificationapplytotheweldingforequipmentbaseofdiversifiedhullcabin.2规范引用文件«船舶建造质量检验»Referringtodocument≤QUALITYINSPECTIONOFSHIPBUILDING≥3焊接前准备Preparationofforewelding3.1CJ422钛钙型药皮碳钢焊条参数(CJ422parametersforCsteelelectrodeofTiandCacovering)表3.1-1(form)试验项目(Testproject)δs(Mpa)δb(Mpa)δ5(%)AKV（-20°）J≥330≥420≥22≥47X射线探伤(Radiographicinspection)：Ⅱ级（Gradetwo）焊条直径(MM)Diameter2.53.245焊接电流(A)Current60~110120~150160~210220~2703.2CJ507低氢钠药皮碳钢焊条参数(CJ422parametersforCsteelelectrodeoflowhydrogenNacovering)表3.2-1(form)试验项目(Testproject)δs(Mpa)δb(Mpa)δ5(%)AKV（-20℃）J(-30℃)≥400≥490≥22≥47≥27X射线探伤(Radiographicinspection)Ⅱ级（Gradetwo）焊条直径(MM)Diameter2.53.2455.8焊接电流(A)Current60~110120~150160~210220~270210~2603.3焊前施工人员应先了解被焊工件的施工要求及作业环境、钢材牌号等级、据此按材料的选配原则确定焊条焊丝牌号、规格及极性。Weldershouldknowabouttheweldingrequirements,environment,brandandgrandofsteelbeforewelding.Accordingtothat,todecidethebrand,sizeofelectrodeandwireandpolarityontheprincipleofchoosingmaterial.3.4定位焊Tackwelding3.4.1定位焊用的焊条牌号应与正式焊缝的焊条牌号相同。Electrodebrandfortackweldingshallbeuniformwithnormalwelds.3.4.2定位焊高度不得超过正式焊缝的高度，焊后的熔渣应立即去除。Theheightoftackweldingdon’texceednormalwelds,eliminatingpostweldslagatonce.3.4.3由于CO2定位焊容易产生焊接缺陷，定位焊缝不宜过短，一般强度钢为（30~40）mm，高强度钢为50mm，焊缝厚为（3~4）mm。ThelengthoftackweldsshallbelongerbecauseofmakingdefectseasilywithCO2gas-shieldedarcwelding.Commonstrengthsteel(30—40)mm,highstrengthsteel50mm,thicknessofwelds(3—4)mm.3.5所要焊接的设备底座已经按照装配要求定位好，并且打磨焊前认可才能进入焊接阶段。Equipmentbasetobeweldedmustbefittedonrequirementslikeandgrinded,beforeitwelded.3.6对于船舶重大设备如主机、发电机、中间轴承、锚绞车、舵机及主甲板设备吊艇、舷梯等基座应选用CJ507低氢钠型药皮碳钢焊条或CO2气体保护焊。Forthegrandshipequipmentweldingofbaseofmainengine,generator,intermediatebearing,windlass,steeringgear,anddavit,accommodationladderwhichisonthemaindeck;shouldchooseCJ507lowhydrogenNacoatingCsteelelectrodeorCO2gas-shieldedarcwelding.3.7其他普通设备基座可选用普通的CJ422钛钙型药皮碳钢焊条。MaychoosecommonCJ422CsteelelectrodeofTiandCacoveringforothercommonequipmentbase.3.8焊接材料Weldingconsumable3.8.1焊丝：WeldingwireCO2焊丝可选用直径为（￠1.2）mm的实芯焊丝或药芯焊丝，并须经船级社认可。并有规则地盘绕在焊丝盘或焊丝筒内。Diameter1.2mmflux-coredwirewillbeusedforCO2gas-shieldedarcweldingandneedbeapprovedbySociety.3.8.2CO2气体：CO2gas使用的液体二氧化碳其质量应符合国家标准GB6052-85《工业液体二氧化碳》中规定的Ⅰ类或Ⅱ类一级标准ThequalityofliquidCO2usedshallaccordwithgradeoneoftypeIorIIruledbynationalstandardGB6052-85≤IndustryliquidCO2≥CO2气瓶压力低于1MPa时不能使用。Don’tuseitagainwhencylinderpressureisbelow1Mpa.3.9焊接设备Weldingequ...
