Composition of BÃHLER metal powders - Tenica

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Hardfacing and thermal sprayingMetal powder hardfacing processPlasma transferred arc welding (PTA)This method is a plasma welding process with a continuouspowder feeding. The powder feeding may be added separatelyas well as directly via the torch.carrier gas for the powder. The powder grains can pass intothe molten pool either in solid or molten form. This dependsupon the size, the shape and the quantity of the grains, thethermo-physical properties of the powder and the plasma,as well as upon the transfer time of the powder grains in theplasma.The arc is initiated between the tungsten electrode and theworkpiece. It is ignited and stabilized simultaneously with theaid of a pilot arc between the tungsten electrode and thecopper nozzle (anode). Main arc and pilot arc are suppliedindependently from their own power source. The tungstenelectrode is enveloped in argon as a centre gas. Within thearc, the argon is ionized forms a plasma with high beamenergy. Argon shielding gas is supplied via the outer nozzle.This shielding gas protects the molten pool against theingress of oxygen. The powder supply to the arc is carriedout via a mechanical metering device. Argon is used as aPlasma transferred arc welding has gained increasing significancein recent years. This process facilitates a build-up ofpowder alloys, which in the form of rods or wire, are difficultto produce or often cannot be produced. The advantagesof plasma powder transferred arc welding is the preciseadjustment of the penetration depth and the build-up thickness(dilution) as well as the high energy density of the plasmaarc. Because of the continuous addition of powder, buildupwelds of uniformity and low porosity are produced sothat, in respect of mass production, a high degree of automationis possible.Tungsten electrodePlasma gas: Ar/Ar+H 2Copper anodeHFPowersourcepilot arcPilot arcMain arcBase materialArArPowder + Powder gasWaterPowersourceWatermain arcShielding gasWelding seamSchematic diagramof a torch for plasmatransferred arc welding.8
BÖHLER metal powders are used for hardfacing of bearingand sealing surfaces of gas, water, steam and acid fittings, alsovalve production for vehicle and shipping engines as well asfor highly stressed and wear resistant hardfacing onhotwork, crushing, stirring, extracting and drilling tools.The preheat and intermediate layer temperatures during theplasma transferred arc welding are dependant on the basematerial, the size of the workpiece and the number of layers.Plasma transferred arc welding of a continuous casting roll forsteel production.Plasma transferred arc welding(hardfacing of a sealing surface).9
Page 1: METAL POWDER AND CASTING RODS
Page 4 and 5: Everything under control:The know-h
Page 6 and 7: The powder is also precipitated und
Page 10 and 11: Flame spray weldingFlame spray weld
Page 12 and 13: Flame sprayingPowder flame spraying
Page 14 and 15: Plasma and high-velocity flame spra
Page 16 and 17: Hardfacing process with casting rod
Page 18 and 19: Typical properties of metal powder
Page 20 and 21: Use of BÖHLER metal powdersGrade A
Page 22 and 23: Composition of BÖHLER casting rods
Page 24 and 25: Deliverable dimensions of BÖHLER c
Page 26 and 27: Physical propertiesThermal expansio
Page 28 and 29: Corrosion behaviour of BÖHLER meta
Page 30 and 31: Practical tips regarding hardfacing
Page 32: Published by BÖHLER WELDINGBöhler

Composition of BÃHLER metal powders - Tenica

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Composition of BÃHLER metal powders - Tenica