plasma cutting[1]

Pacproc.ppt dah 2/26/97 1

PLASMA ARC

CUTTING

PLASMA ARC

CUTTING


THREE CUTTING METHODSTHREE CUTTING METHODS

MECHANICALMECHANICALSaw, Drill, Punch, Sheer

CHEMICALCHEMICALOxy-Fuel

THERMALTHERMALPlasma, Electron Beam, Laser


THERMAL SOURCE REQUIREMENTSTHERMAL SOURCE REQUIREMENTS

HIGH TEMPERATUREHIGH TEMPERATURE

HIGHLY FOCUSED and HIGHLY FOCUSED and INTENSE SOURCEINTENSE SOURCE

ADEQUATE MOMENTUM of ADEQUATE MOMENTUM of MEDIUMMEDIUM


TIG ARCTIG ARC

WELD PUDDLE

SHIELDING GAS

TUNGSTEN ELECTRODE

GAS CUP

OPEN ARC


TEMPERATURE DIFFERENCETEMPERATURE DIFFERENCE


CONVENTIONAL TORCHCONVENTIONAL TORCH


DUAL FLOW TORCHDUAL FLOW TORCH


WATER INJECTION TORCHWATER INJECTION TORCH


WATER INJECTION CUTSWATER INJECTION CUTS


OXYGEN AND AIR CUTTINGOXYGEN AND AIR CUTTING

Best suited for carbon steel less than Best suited for carbon steel less than one inch thickone inch thick

Requires hafnium electrodesRequires hafnium electrodes

Shorter electrode lifeShorter electrode life

Limited to about 360 ampsLimited to about 360 amps

Oxidizes cut face on non-ferrous materialOxidizes cut face on non-ferrous material


Oxygen and AIR on CARBON STEELOxygen and AIR on CARBON STEEL

Very smooth cut faceVery smooth cut face

Square edge on good sideSquare edge on good side

Faster speeds than nitrogen at the same Faster speeds than nitrogen at the same current levelscurrent levels

Easier to remove dross if presentEasier to remove dross if present

Reduced surface nitrides with oxygenReduced surface nitrides with oxygen


USE NITROGEN WHEN...USE NITROGEN WHEN...

Cutting carbon steel over one inch thick Cutting carbon steel over one inch thick

Cutting non-ferrous metals; Al & SSCutting non-ferrous metals; Al & SS

Dross formation is not a problemDross formation is not a problem

Surface nitrides are not a problemSurface nitrides are not a problem

There is a need to have longer There is a need to have longer consumable lifeconsumable life


USE OXYGEN WHEN...USE OXYGEN WHEN...

Cutting carbon steel less than one inch Cutting carbon steel less than one inch thickthick

There is a need to minimize drossThere is a need to minimize dross

There is a need for a squarer cut faceThere is a need for a squarer cut face

There is a need to eliminate surface There is a need to eliminate surface nitrides for weldingnitrides for welding


PLASMA ARC

GOUGING

PLASMA ARC

GOUGING


PLASMA GOUGINGPLASMA GOUGING

PT-17AM IN AIR


PLASMA CUTTING vs GOUGINGPLASMA CUTTING vs GOUGING

PLASMA CUTTINGPLASMA CUTTINGTORCH HELD 90O TO PLATE

SURFACE

HIGHLY CONSTRICTED ARC

HIGH ARC FORCE PRODUCES CUT

PLASMA GOUGINGPLASMA GOUGINGTORCH ANGLED 30O TO

PLATE SURFACE

LARGER NOZZLE PRODUCES SOFTER DEFUSED ARC

ARC WASHES THE SURFACE INSTEAD OF CUTTING


PLASMA GOUGING ADVANTAGESPLASMA GOUGING ADVANTAGES

Lower fume levelsLower fume levels

Lower noise levelsLower noise levels

High quality surfaceHigh quality surface

Lower costLower cost


PLASMA GOUGESPLASMA GOUGES

ALAL CS CS SS SSALAL CS CS SS SS

plasma cutting[1]

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