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1、Repairprocedureofthestainlesssteeltank不锈钢罐修补工艺第4页共4页一．General总体要求Bothofwelddefectsandbasemetaldefectsshallberemovedbysuitablemethod,toavoiddamagingthenaturaloxidefilm,mostcaremustbetaken.Acidpicklingandpassivationarenecessaryifthenaturaloxidefilmwasdamaged.焊缝和母材的缺陷均应采取适当的方法去除，去除时应尽量减少对金属表面
2、的损伤，对于轻微损伤可进行酸洗钝化处理。二．Repairofdefectivewelds去除和修补不合格焊缝金属Themethodsofrepairingdefectiveweldsshallbeasfollows:对于具有缺陷的焊缝采用如下方法进行修补：1.Theweldscontourdoesnotmeetrequirement:焊缝外形尺寸和形状不符合要求：Grindingwithstainlesssteelwheel,fordeepandnarrowwelds,weldingshouldbeused.用不锈钢砂轮进行修正，并打磨光顺，焊缝过窄过低时，采用手工电弧焊修
3、补。2.Undercut咬边：Undercutshallnotover0.5mm,forundercutover0.5mm,weldingshouldbeusedtorepair，andgrindingshallbeforbidden.咬边深度不得超过0.5mm，超过0.5mm的，需采用手工电弧焊修补，不允许以磨光母材方法来修补。3.Crater弧坑：RepairbySMAWafterremoval.未填满的弧坑，清理后用手工电弧焊修补。4.PorosityandSlaginclusion气孔和夹渣：Defectsinweldsshallbeclearedbycarbona
4、rcairgougingandgrinding,andshallberepairedaccordingtocorrespondingweldingprocedure.ThesurfaceporosityshallberepairedbySMAWafteritisremoval.Repairprocedureofthestainlesssteeltank不锈钢罐修补工艺第4页共4页经检查确认为内部缺陷的部位，应用碳弧气刨清除全部缺陷，然后将氧化物去除干净，最后进行补焊。表面气孔，经对缺陷进行清理后，以手工电弧焊修补。1.Lackofpenetration未焊透：Removin
5、gthedefectbygougingandgrindingtosoundmetalandweld,andthenuseweldingtocompletetheweld.经检查确认为未焊透的部位应用砂轮机或碳弧气刨清除，然后进行焊补。2.Crack裂纹：Whereanycrack,soundmetaloneortwoinchesoverbothendsofthecrackshallberemoved.PriortoweldingPTshallbecarriedouttoverifycompleteremovalofthedefect.裂纹及其两端各30～50mm范围内彻底铲
6、除，补焊之前应进行渗透探伤（PT）以确保裂纹是否完全铲除。一．Requirementsofbasemetalrepair母材缺陷修补的几点要求1．Afterremovalofbasemetaldefects,ifthedepthofgrindingislessthan2mm,justacidpickleandpassivatethesurface;ifthegrindingdepthover2mm,repairbywelding,andthenacidpickleandpassivatetheweldsurface.母材缺陷去除后，打磨深度小于2mm，表面直接酸洗钝化处理即
7、可；若打磨深度超过2mm，需进行手工电弧焊修补，而且焊接完成后表面需做酸洗钝化处理。2.Ifthediameterofrepairareaislessthan9.5mm,weavingprocessmaybeusedduringwelding.Butforthediameterofrepairareaover9.5mm,itneedtogroovebygrindingpriortowelding,stringerprocessisprefered,butifweaving,theweavingrangeshallb
