Composition of BÖHLER metal powders - Tenica

Practical tips regarding hardfacingProblemsCausesCountermeasuresLack of fusionLack of sidewallfusionWelding parameterSide walls too steeply, no radiusOptimization of the welding parameters.Flat position with sidewall angle 30 - 45 ° turnedwith radius of (R 1 - 3).DimensionalaccuracyShrinking ordistortionBase material delivered ready measured or littlerecord of detailed measures of the basematerial.High welding stresses, high welding andintermediate layer temperature, largernumber of layers.Edge construction (e.g. copper shoe), similarwelding material construction, buffering.Welding positioner, number of 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 of layers.Buffering, base material with a low C content,adjustment of the thermal expansions, high weldingand intermediate layer temperature, lower numberof layers, suitable welding process.Hot crackformationOverheating of 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 of 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 of 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