拱頂冷熱熔鹽儲(chǔ)罐焊接施工焊前準(zhǔn)備

1、拱頂冷熱熔鹽儲(chǔ)罐焊接施工焊前準(zhǔn)備4WeldPreparation4.1坡口形式熔鹽罐各部位焊接方法項(xiàng)目間隙形式角度備注邊緣板對(duì)接內(nèi)端1214mm外端810mm加墊板50°中幅板對(duì)接及收縮縫6mm加墊板40°大角縫2mm/內(nèi)側(cè)45。夕卜側(cè)50°罐壁環(huán)焊縫間隙2±1mm/內(nèi)側(cè)45°夕卜側(cè)45°罐壁縱焊縫3mm/50°-60°4.2Weldingvariouspartsofmoltensalttanks序號(hào)No.焊接部位Weldingparts焊接方法Weldingmethod所用焊材Welding4.3焊接注意事項(xiàng)co

2、nsumables1熔鹽罐底板Moltensalttankbottom氣保焊+埋弧自動(dòng)焊GMAW+SAWER50-6+H10Mn2V2熔鹽罐壁板立縫Moltensalttankwallstandingseam氣電立焊EGWAT-YJEG50A3熔鹽罐壁板環(huán)縫（外側(cè)）Moltensalttankwallringseam熔鹽罐壁板環(huán)縫（內(nèi)側(cè)）Moltensalttankwallringseam埋弧自動(dòng)焊SAW手工電弧焊SMAWH10Mn2J5074熔鹽罐大角焊縫Bighornweldmoltensalttank焊條電弧焊+埋弧自動(dòng)焊GTAW+SAWJ507+H10Mn2I5熔鹽罐拱頂板手工電弧焊J

3、507MoltensalttanktopplateGTAW4.3Weldingattenation設(shè)計(jì)圖紙中除注明者外，其余角焊縫的焊腳高度均等于兩相焊件中較薄件的厚度，且須為連續(xù)焊。4.3.1Unlessotherwisenotedinthedesigndrawing,otherfilletweld'sweldjointheightshallbeequaltothethinnerpartofthetwoweldedparts,andcontinuousweldingisrequired.凡參加儲(chǔ)罐焊接的電焊工必須經(jīng)勞動(dòng)部門(mén)的考試合格并有相應(yīng)項(xiàng)目和位置焊工擔(dān)任。4.3.2Welders

4、whoengagedinthestoragetankweldingmustpasstheexaminationofthelabordepartment,andtheweldingworkshallbeperformedbythewelderwithcorrespondingprojectandposition.定位焊應(yīng)由合格焊工施焊，焊接工藝要求與正式焊接相同。引弧和熄弧不應(yīng)在母材或完成的焊道上，正式焊接前應(yīng)將定位焊縫兩端修磨成緩坡，保證接頭的質(zhì)量，定位焊長(zhǎng)度不小于50mm4.3.3Tack-weldingshallbeperformedbythequalifiedwelder,andthew

5、eldingprocessrequirementsshallbeidenticaltoformalweldingrequirements.Run-ontabandrun-offtabshallnotbeappliedinparentmaterialorthecompletedweldpass,priortoformalwelding,itisrequiredtotrimandgrindbothendsofthetackweldintoslowslopesoastoensurethejointquality,andthetackweldlengthshallnotbelessthan50mm.焊

6、縫組裝前應(yīng)清除坡口表面及兩側(cè)各20mn范圍內(nèi)的泥沙、鐵銹、水分和油污，并充分干燥，露出金屬光澤。4.3.4Priortoassemblingweld,bevelsurfaceand20mmofbothsidesshallbefreeofsediment,rust,water,andgrease,itshallbefullydried,anditisrequiredtohavethemetallicluster.435焊接中應(yīng)保證焊道始端和終端質(zhì)量，始端采用后退起弧法，終端應(yīng)填滿(mǎn)弧坑，多層焊的接頭應(yīng)錯(cuò)開(kāi)。4.3.5ltisrequiredtoensurestartingandfinishinge

7、ndofeachweldpassarequalified,thestartingendadoptsbackwardarcstrikingmethod,thefinishingendshallhavethecraterfilledfully,andjointofmultilayerweldingshallbestaggered.雙面焊的焊縫背面焊接前，當(dāng)采用碳弧氣刨清根時(shí)，應(yīng)修整刨槽并磨除滲碳層。所有角接及T型接頭焊縫，至少焊兩遍完成，接頭錯(cuò)開(kāi)，圓滑過(guò)渡；板厚大于或等于6mm的搭接角焊縫，至少焊兩遍。4.3.6AIIcornerjointandTjointweldsshallbeweldedatleasttwice,jointsshallbe