法兰管的焊接方法(中英翻译-20121031)

法兰管的焊接方法Weldingmethodforflangeandsteelpipe1.焊接前将焊条烘烤1小时左右，烘烤温度为150℃左右。烘好后的焊条放在干燥桶内备用；Beforewelding,theelectroderodsarerequiedtobakeaboutonehouratthetemperatureof150℃.Bakedweldingrodsshallbestoredinadrybarrelforuse.2.将需加热的法兰盘放入指定的加热炉中进行加热，加热温度为550℃~650℃，确保焊接法兰盘内孔与直管外径配合有0.5mm~3mm的过盈量，使其装配牢固可靠。同时将待焊直管按尺寸切割好，清理好焊接部位的砂子、水泥、涂料等脏物；Preheated-theflangeshouldbeputintoappointedheater,thenheated.Theheatedtemperatureisabout550℃—650℃。Thereisone0.5mm-3mmroomrequirementbetweentheflangeinnerdiameterandthepipeoutletdiametersothattheyareassembledsteadily.Atthesametime,thepreparativeweldingpipeshouldbecuttedexactly.Anyimpuritiessuchassand,cementandcoatingshouldberemovedclearly.3.加工法兰盘确保形状尺寸符合图纸，外观合格，无碰伤、锈蚀及变形等外观缺陷；Theflangeappearanceanddimensionshouldcomplywithdrawingrequirementandthereisnoapperarancedefectsuchasdamage,rustanddeformedandsoon.4.将法兰盘装配到直管上，保证双法兰管的两盘孔的中心同轴，各部尺寸符合图纸要求；Theflangesaremountedtothepipeproperlyandmakesurethecenteroftheflangeholesareconcentricandaccordingtodrawingrequirement.5.装配好后用Z408镍铁焊条进行焊接。在焊接过程中，电弧不宜过长，保证电弧稳定燃烧，焊缝焊透、表面平整，焊波均匀焊缝，熔深适宜、不产生咬边现象；Afterassembled,starttoweldwithZ408Nickelelectroderods.Intheweldingprocedure,thearcshouldnotbetoolonger,butburnsteadily.Theweldseamisinfullweldpenetrationandnoundercut,nosagsandcrests,nodefect.6.在焊接过程中，焊接速度应该均匀适当，既要保证焊透又要保证不烧穿，同时要保证焊缝宽度和高度达到强度要求Inthewelding,theweldingspeedshouldbeproperanditisrequiredwithfulldepthpenetrationbutnotallowedburningthrough,meanwhileweldseaminwidthandheightbeinguptostrengthrequirement7.焊后检验weldinginspection1)外观检查检验前将焊缝附近10—20mm范围内的飞溅和污物清除干净。检查焊缝的表面缺陷，如发现焊缝有外气孔、咬边、焊瘤烧穿以及裂纹、要及时焊补返修.Appearanceinspection.Beforeinspection,removeallthespatterandimpuritiesontheextentof10-20mm.ifanyporosities,undercut,scratchandcrack,itisrequiredtore-weldingintime.2)致密性检查根据管件试压标准对焊接管件或法兰管进行水压试压，不得有渗漏现象；Tightnessinspection-Theweldingpipeorflangefittingsshouldbetestonthebasisofthehydrostaticteststandard.Itisqualifiedifnoleakage3)破坏性试验有必要时，可从焊件或试件上切取试样，或以产品（或模拟体）的整体破坏做试验，以检验其各种力学性能、抗腐蚀性能等。以确保焊接质量。Destructivetest-Ifnecessary,itispossibletocutsamplesfromweldingpartortestpartforthedestructivetest,eventakingthewholeproductorsimulacrumtotestmechanicalperformanceandcorrosionresistancesoastoensuretheweldingquality.8.焊后检查好的焊管要将内环焊缝处用水泥衬涂覆盖，并修补好。对管身、法兰盘及焊接处的外表面进行表面喷涂锌层及沥青漆。Afterinspection,thequalifiedpipesshouldbecoatedwithcementontheinnerweldseamparts.Astothepipesurface,flangesandweldingjointpartshouldbegalvanizedorpaintedbybitumen.