船用鑄鋼件與船用強度鋼手工焊

船用鑄鋼件與船用強度鋼手工焊~~船用鑄鋼件與船用高強度鋼氣體保護(hù)焊/手工電弧焊焊接工藝規(guī)程WPSofShipCastingSteeltoHighStrengthSteelGasShieldedWelding/SMAW船檢意見：焊工必須持經(jīng)過船級社認(rèn)可的焊工證焊接材料必須符合焊接工藝標(biāo)準(zhǔn)經(jīng)DNV認(rèn)可預(yù)先進(jìn)行焊接試驗，樣板須經(jīng)過NDT檢測并合格再上船安裝之前焊接過程和焊接參數(shù)進(jìn)行控制并記錄船上焊接焊縫需經(jīng)過NDT檢測合格船東意見焊工名單人員須經(jīng)DNV認(rèn)可資質(zhì)焊接材料需提供證書焊接結(jié)束需通過UT和MT檢測提供報告焊接過程中船廠必須對溫度（層間溫度）控制5.船廠必須對預(yù)熱及焊后熱處理進(jìn)行控制，焊接報告必須提交至DNV及船東辦公室。熱或緩慢焊接來控制層間溫度。Interpasstemperaturetobecontrolledof125~160℃,thelowerlimitationensuresatleastpreheatconditionsduringsubsequentpasses,themaximumlimitoftemperaturetobeabsolutelycontrolledtoavoidthermalstresscracks.Controlinterpasstemperaturebysupplementaryheatasperabovepreheatprocedureorweldingslowly.7．后熱處理PostweldHeatTreatment對于大型鑄鋼件，可將焊縫區(qū)域用電加熱設(shè)備或火焰加熱到120℃，保溫1.5小時并覆蓋以絕緣毛毯，然后使其緩慢冷卻。Asregardslargecastingssuchthetemperatureoftheweldingareashouldbeheatedto120℃byelectricalheatingequipmentandflame,thenwrappedwithinsulationblanket,andkeepthetemperatureforapproximately1.5hoursthenallowtocooldownslowly.8．焊接材料的管理ControlOfWeldingMaterials焊接結(jié)束，焊條必須返還到儲藏室去。RestElectrodesshouldbereturnedtothestoredhouseafterfinishwelding.焊條干燥狀態(tài)如下conditionfordryingelectrodesisasfollows: 焊接材料weldingmaterial標(biāo)號brand烘干溫度dryingtemp.保溫conditionedtemp.低氫型lowhydrogenJH.E5015300~350℃80~120℃最長使用時間usedmax.Time1).室外工作出4小時以內(nèi)。Within4hrinoutdoorworking.2).室內(nèi)工作出5小時以內(nèi)。Within5hrinindoorworking.3).超過以上時間焊條必須送回烘干室烘干。Overabovementionedtimeelectrodeshouldbereturnedtodryingroom.焊接方法weldingprocess焊接位置weldingposition直徑(mm)dia.ofwire/electrode電源極性Powerpolarity電流(A)current電壓(V)voltage焊接速度(cm/min)speed接頭細(xì)節(jié)jointdetails手工電弧焊ManualMetalArcWelding平焊flatФ3.2Ф4.0直流反接Directcurrent90~24025~305~20電極立焊verticalФ3.2Ф4.0直流反接Directcurrent90~20025~304~109.焊接注意事項Noticeduringwelding1）焊接過程引弧應(yīng)有焊縫中心引燃，避免傷母材引起應(yīng)力集中造成表面裂紋。Runinweldingfromweldsbevelcentertopreventmotherplatedamageandstressconcentratedcrack.2）焊接過程嚴(yán)格控制層間溫度，隨時監(jiān)控檢測靠近環(huán)氧區(qū)域溫度嚴(yán)格控制低于100?C，施行間歇燒焊。Layertemp.mustbecontrolledduringwelding,andmonitoringepoxysurroundedareatobekeptlowerthan100°Ctimely.3).焊接過程嚴(yán)格做好焊接記錄—焊接參數(shù)、焊工名、焊工證、預(yù)熱溫度、層間溫度、焊后加熱溫度、保持時間、焊道數(shù)量等，見附表。Mustbetakerecordduringweldingprocessweldingparameter/welder/welder