Powder Plasma Arc Welding ( PTA )

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Powder Plasma Arc Welding ( PTA )

• ARCRAFT PLASMA EQUIPMENTS ( INDIA ) PVT LTD,
• 124 , DIAMOND INDUSTRIAL ESTATE ,
• KETKIPADA , DAHISAR ( EAST )
• MUMBAI 400068, INDIA.
• email arcraft_at_vsnl.com ,web www.arcraftplasma.c
  om.

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Arcraft Plasma Equipments (I) Pvt ltd

• Arcraft Plasma Equipments ( India ) Pvt Ltd are
  leading manufacturers of Plasma Torches ( Both ID
  and OD ) Power sources , Positioners ,
  Manupilators and related equipment used for PTA
  welding .

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PTA

• Powder Plasma welding is widely used for
  hardfacing , wear resistance , corrosion
  resistance , impact resistance besides many
  applications in a wide variety of industries.

• The benefit of PPAW or PTA is that it
  gives a strong metallurgical bond unlike many
  thermal spray processes.

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P.T.A. DEPOSITS SHOW THE FOLLOWING
CHARACTERISTICS An attractive bead with no signs
of oxidation, and with little or no ripple. Very
low dilution High, density, no porosity no
inclusions. Microphotos or x-rays show the
deposits to be of high density metallurgically
bonded to the Substrate.
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PPAW / PTA system

• This is a complete system consisting of
• Power source
• Plasma torch with cables
• Torch Oscillator
• Controller
• Water chiller and recirculator
• Positioner
• Torch Manupilator or Column and Boom

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Main Unit

• This is the main unit which also has the Pilot
  arc system for striking the plasma arc. The main
  Power Source is a reliable inverter based system
  with indicators for Current and Voltage .
• It also has Flowmeters for controlling thePlasma
  Gas and Sheilding Gas .
• It has indicators and switches for various
  functions which will be explained in more detail

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Control console

• Flowmeter for Plasma gas and Shielding Gas
• Power on /off switch with indicator
• Indicator for gas flow with Test and Switch off
  function
• HF/ Pilot arc test and switch off function.
• Water chiller on / off switch
• Trip indicator for water and gas failure
• 220 and 24 VAC Fuse in case of current over
  drawing due to fault in electrical / electronic
  components

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Power Source

• Power source for delivering power to the plasma
  torch
• Power source will be selected depending on
  customers requirement / location and budget.
• For export models we use Lincoln ( USA ) power
  source with current and voltage display and
  international warranty of three years .

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Plumbing Board

• The Plumbing board has all the fittings for
  water , power and gas connections to the torch.

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Powder feeder on /off

• This panel gives 220 VAC supply to the powder
  feeder and also the on / off signal .
• It has a floating auxillary contact for external
  interface if required.

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Plasma Torch for surface applications.

• 400 Ampere heavy duty PPAW torch with 8 meter
  cables for surface applications.
• Torch is fully servicable with no moulded parts
  for easy replacement.

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Plasma torch for internal bore welding
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I D 75 mm pipe
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Plasma torch for internal bore welding

• This torch can do service in internal bore of
  pipes of minimum diameter 75 mm and a length of
  500 mm continuosly . Longer lengths can be
  developed .

• Torches are being developed for even smaller
  bores.

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Controller
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Controller

• Controller has functions for controlling the
  torch manipulator ( up,down , left right of
  base )
• Job positioner ( tilting , rotation speed and
  direction)
• Pilot arcing and weld start
• Programmes for torch oscillation automatic weld
  sequence straight or circular.

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Oscillator control

• Oscillator stroke width from zero to 25 mm
• Speed of oscillation upto 60 strokes per minute
• Dwell time 0 to 9.9 seconds independently
  adjustable on both sides.

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Linear weld in control

• Cycle time
• Stroke and speed of straight weld
• Step for number of bands

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Circular weld programme

• Speed control of rotational movement
• Cycle count for stepover of torch for number of
  bands .
• Overlap between two bands can be preset as
  required

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Welding Positioner

• Available in tilting or fixed models upto .
• Faceplate diameter and weight bearing capacity as
  per customer requirement

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Torch Manupilator or Column and Boom

• Various models available for height and stroke
  length
• Provison for oscillator mounting
• Base can also move and rotate manual or motorised
  options

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Powder Feeder

• Hopper capacity of 5 kgs
• Delivery capacity 5 kgs per hour
• Positive displacement of powder gives smooth flow
  of powder without pulsing.
• No need to place the feeder above the torch as
  required by gravity based feeders

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Torch Oscillator

• Consist of stepper motor with ball screw
  mechanism for smooth jerk free movement as per
  signal from controller

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Water Chiller cum Recirculator

• Water chiller refrigerator heat transfer
  principle with digital display of water
  temperature .
• 50 liter water storage capacity

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Some completed jobs
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Some completed jobs
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Internal bore
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APPLICATIONS In a competition with laser
surfacing the PTA technology offers much more
high productivity, comparable high quality of
deposits and significantly lower costs. Typical
application areas of the PTA technology are
extruding machine screws, valves, valve seats of
internal combustion engines (motorcar, marine,
locomotive etc.), accessories for ships,
petroleum chemistry and power generation, cutting
tools (milling cutters, broaches, knifes)
,Equipment for mining, crushing, rolling, road
building and tunneling, Process equipment in
ceramics and cement production,Molds and forging
dies, Pulp and paper industry equipment,
Agricultural equipment, parts for nuclear plants,
parts for chemical plants