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1、工商管理（工商企业管理方向）专业毕业论文题目：浅析中小企业的现状与生存发展之路edgesshouldbecleaned,aftermakingsurethatnodefectshallbemarkedwithamarkerpentowritedownweldingneartheweld,includingthesloganofwelding,welders,etc.(16)weldingQianPreheatandtheweldingHouheattreatmentpipeweldingQianPreheatandtheweldingHouheattrea
2、tmentprocessconditionsweldingQianPreheatandtheweldingHouheattreatmenttemperaturetableprojectmaterialweldingQianpreheattemperature(℃)weldingHouheattreatmentandtheinsulationtime(℃/H)wallthick(mm)temperature(℃)wallthick(mm)temperature(℃)20≥26100~200>36600~650/1-1.515CrMo≥10150~200>10
3、670~700/1.2-2Preheatandtheheattreatmentprocessinthe,Innerandouterwalltemperatureshallbekeptuniform,inordertoavoidinternalstresses.Preheatingbeforeweldingandpostweldheattreatment,shallmeasureandrecordthetemperature,temperaturemeasurementlocationsandnumberofpointsarereasonable.Prone
4、towelddelayedcrackofsteel,postweldheattreatmentafterweldingshouldbecarriedoutpromptly,whennotconductingtimelypostweldheattreatment,shouldbeuniformlyheatedto200~300℃immediatelyafterweldingandinsulationandslowcooling,...26mmmorethan20steelpipeweldingpreheatingbeforeweldingshouldbeca
5、rriedout,36mmtheaboveheattreatmentafterweldingshouldbedone.Beforeweldingandheattreatmentusedoxyacetyleneflameheating,heattreatmentafterweldingusingspecialheattreatmentafterweldingequipment.Hardnessafterheattreatmentofweldsneededtesting.6.5.4sidesofthedissimilarsteelweldingwhenwere
6、non-austeniticsteelorausteniticsteel,alloycontentaccordingtoloweronesideofthebasemetalorselectingweldingmaterialinbetween.Whenoneofthesidesofmaterialwhenausteniticsteels,shouldselectthe13指导教师评语初评成绩及格指导教师（签名）：2012年6月10日电大分校初审意见初审成绩分校初审小组组长（签名）：年月日电大分校终审意见复审成绩分校复审小组组长（签名）：年月日edgessh
7、ouldbecleaned,aftermakingsurethatnodefectshallbemarkedwithamarkerpentowritedownweldingneartheweld,includingthesloganofwelding,welders,etc.(16)weldingQianPreheatandtheweldingHouheattreatmentpipeweldingQianPreheatandtheweldingHouheattreatmentprocessconditionsweldingQianPreheatandthe
8、weldingHouheattreatmenttemperatur
