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The PLAMA State

1.1

Plasma properties

1.2

The Ionization and Dissociation  phenomena

1.3

Existance conditions for plasma  state: SAHA and DEBYE laws

1.4

Plasma arc technology

1.5

Plasma gas properties: chemical  & phisical data

1.6

The Plasma torch and working  conditions

1.7

The arc discharge: phenomena

1.8

The Heat dissipated at electrodes

1.9

The Plasma arc stabilization

1.10

The Cathodic electrode: shape, set  back, centering criteria

1.11

The plasma column and its  temperature

1.12

The powder descent into the plasma  column

1.13

Pilot arc ignition and thermal  stabilization cycle

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The PTA Process

2.1

General description

2.2

Bond type of PAW

2.3

Main differences with GTAW, OXY  and SPRAY process

2.4

PTA equipment by Plasma Team  production

2.5

The PTA torch: description and use

2.6

The Powder dispenser: description  and use

2.7

The cooling unit: description and  use

2.8

Plasma, carrier, shielding gas:  technical data

2.9

The torch oscillator and the AVC  control

2.10

Timing of currents, powders, gas  and mechanical movements

2.11

Block diagram of PTA Process

2.12

Groove study: some case history

2.13

Deposit shape and its control

2.14

Quality controls of deposit

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The PTA Deposit

3.1

The powder and base material  fusion

3.2

Shape and characteristics of the  fusion bath

3.3

The het input per unit length

3.4

Shape and structure of isothermal  lines

3.5

Fusion bath control and welding  parameters

3.6

Plasma Semitransferred Arc  technique (PSTA)

3.7

Dilution and penetration of the  deposit

3.8

Deposit dilution and its  minimization

3.9

Deposit shapes and structures

3.10

The welding speed

3.11

Hardfacing sequences

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The PTA Powders

4.1

Wear mechanisms: fundamentals

4.2

Antiwear alloys in powder form:  shape and characteristics

4.3

Basic principles for powder choice