内容总结钎焊.doc

whatisweldabilityofmaterials?suitabilityofmaterialsforwelding,suchasb)propertiesoftheweldedjointforapplication,suchashowtoevaluatetheweldabilityofdifferentmaterials,especiallyformetals?a)position,suchascarbonequivalent,parametersofcracking,andhardnessofHAZb)weldabilitytests:crackingandmechanicalproperties:)Physicalandchemicalproperties,suchasd)Strengtheningmechanism,suchasfinegrain,substitutionandinterstitialsolidstatesolution,precipitate,ageingwhatisHAZ??Andwhatarethey? Weld,fusionzone,HAZandbasemetalDoyouknowhowmanyfactorsthathaveeffectonweldability?Basemetal,fillermaterialsweldingtechnologyandparameters,structures,positions,ambienttemperatureWhatisPreheatingtemperature,andwhyisitneededsometimes?Tpistheworkpiecesneedtobeheatedtoacertaintemperaturewithoxyacetyleneflame(氧乙炔焰)?a))Graincoarseningorimpairmentofproperties;c))e)?,,whatistheeffect?Iftheprocessofpreheatingisrequired,?a)heattreatmentpostwelding;b),transformationembrittlementandhardening,andpossibilityofcrrosionresistance,creepresistance,(焊接热循环).(指标pl):Calculatedindices:carbonequivalent(p2-6,equation1-1—1-