Practical tips regarding hardfacingProblemsCausesCountermeasuresLack <strong>of</strong> fusionLack <strong>of</strong> sidewallfusionWelding parameterSide walls too steeply, no radiusOptimization <strong>of</strong> the welding parameters.Flat position with sidewall angle 30 - 45 ° turnedwith radius <strong>of</strong> (R 1 - 3).DimensionalaccuracyShrinking ordistortionBase material delivered ready measured or littlerecord <strong>of</strong> detailed measures <strong>of</strong> the basematerial.High welding stresses, high welding andintermediate layer temperature, largernumber <strong>of</strong> layers.Edge construction (e.g. copper shoe), similarwelding material construction, buffering.Welding positioner, number <strong>of</strong> layers as less aspossible, low welding and intermediate layertemperature (if no cracks).Crack formationVery hard welding material, base material with alarge C content, low welding and intermediatelayer temperature, larger number <strong>of</strong> layers.Buffering, base material with a low C content,adjustment <strong>of</strong> the thermal expansions, high weldingand intermediate layer temperature, lower number<strong>of</strong> layers, suitable welding process.Hot crackformationOverheating <strong>of</strong> the weld pool, high welding andintermediate layer temperature, analyticalpollutions, unwanted trace elements.Prevent overheating, low welding and intermediatelayer temperature, no analytical pollutions, nounwanted trace elements.Pore formationOxide skin /Slag formationOverheating <strong>of</strong> the weld pool, analyticalpollutions, unwanted trace elements, flameadjustment, reactions to the gas formation.Base material surface containing scale, oxide andslag creator in the analysis (e.g.Al,Ti), shieldinggas not sufficient.No overheating <strong>of</strong> the weld pool, no analytical pollutions,no unwanted trace elements, optimal flameadjustment, no reactions to the gas formation.Metallically clean base material surface, no oxide orslag creators in the analysis, more shielding gas.Our technological department is at your disposal for further information or consultations.30
Several engine valves processed by hardfacing withBÖHLER <strong>metal</strong> <strong>powders</strong> and casting rods.
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