专业英语复习词汇1.氧乙炔焊oxyacetylenewelding2.电弧焊arcwelding3.熔化极气体保护焊gasmetalarcwelding4.熔化极惰性气体保护焊metalinertgasesarcwelding5.活性气体保护焊metalactivegasesarcwelding6.钨极气体保护焊gastungstenarcwelding7.埋弧焊submergedarcwelding8.激光束焊laserbeamwelding9.电子束焊electronbeamwelding10.压力焊pressurewelding11.电阻焊resistancewelding12.冷压焊coldpressurewelding13.摩擦焊frictionwelding14.超声波焊ultrasonicwelding15.高频焊highfrequencywelding16.钎焊brazingwelding17.黑色金属ferrousmetals18.杂质impurity19.不锈钢stainlesssteel20.焊区weldingzone21.表面硬化casehardening22.临界点criticalpoint23.渗碳carburizing24.淬透性hardenability25.体心立方body-centeredcubic26.面心立方face-centeredcubic27.奥氏体austenite28.铁素体ferrite29.马氏体martensite30.渗碳体cementite31.晶格crystallattice32.热应力thermalstress33.珠光体pearlite34.脱碳decarburization35.热变形thermaldistention36.二氧化碳carbondioxide37.气孔porosity38.电压降voltagedrop39.正接straightpolarity40.反接reversepolarity名词解释1.Welding：Weldingisthejoiningofmetalsandplasticsbymethodsthatdonotemployfasteningdevices.2.Ferrousmetals：Ferrousmetalsaremetalswhichcontainiron.3.Nonferrousmetals：Nonferrousmetalsaremetalswhichdonotcontainiron.However,somenonferrousmetalsmaycontainasmallamountofironasanimpurity.4.Manualwelding：Manualweldingisunderstoodbethatinwhichtheweldingvariablesarecontinuouslycontrolledbytheoperatorandmeansforweldingheldintheoperator’shand.5.Steel：Steelisanalloycontainingchieflyiron,carbon,andcertainotherelementsinvaryingamounts.6.Low-carbonsteel：Low-carbonsteeloftencalledsoftormildsteel,contains0.04to0.30percentcarbon.7.Heat-treatment：Heat-treatmentisatermappliedtoavarietyofproceduresforchangingthecharacteristicsofmetalbyheatingandcooling.8.Hardening：Hardeningisaprocessofheatingandcoolingsteeltoincreaseitshardnessandtensilestrength,toreduceitsductility,andtoobtainafinegrainstructure.9.Tempering：Temperingisaprocessofreducingthedegreeofhardnessandstrengthandincreasingthetoughness.10.Annealing：Annealingistheprocessofsofteningsteeltorelieveinternalstrain.11.Stressrelieving：Stressrelievingisame