|
Magnetic
Particle Inspection reveals not only cracks invisible to the un-aided
eye, but also makes easily visible those defects which, would require
a close and tedious examination of the component surface.
The
technique is used in a wide variety of industries including automotive,
aircraft engine and structures, power generation, oil and gas, foundry,
and in industries which process steel or iron. It is invaluable
for the inspection of components which have been in service where
fatigue cracks could be present.
Multi-directional
swinging field magnetising
Circular
magnetizing with current flow or threader bar
Longitudinal
magnetizing with coil or magnetic flux flow
Induced
A.C. Current flow for ring shaped components
Separate
power pack with current output up to 20,000 Amps peak
Separate
ink tank with ink agitation to keep particles in suspension
OPTIONS
Fixed
or folding canopy, motorized if required
Automatic
inking of components
Split
headstock for magnetizing conrod ends etc
Programmable
- up to 100 user programs available
The
EUROMAG universal crack detectors are suitable
for testing a wide variety of component sizes and shapes, locating
surface and sub-surface defects in any direction. The system is
designed to be modular so that the equipment is constructed to only
include facilities appropriate to the users applications. Those
which are not necessary are not included and therefore the equipment
is entirely suitable for the planned application and at the most
economic cost.
MAGNETISING
MODES AVAILABLE
- Circular
Magnetisation with Current Flow or Threader Bar
- Longitudinal
Magnetising with Coil or Magnetic Flux Flow
- Multi-directional
Magnetising using simultaneous Longitudinal and Circular Magnetising
Modes
- Induced AC
Current Flow for Ring shaped Components
- Current waveforms
available A.C., H.W.D.C., F.W.D.C. and Three Phase F.W.D.C.
INNOVATIVE
FEATURES
A.C.
MAGNETIC FLOW
For the longitudinal magnetisation of small parts which might otherwise
be obscured by the encircling coil. It can also used for the longitudinal
magnetising element in multi-directional magnetising and for the
induced current technique
CONSTANT
CURRENT CONTROL
The magnetising current is pre-selected and will be delivered to
the selected magnetising mode irrespective of load conditions within
maximum limits.
VARIABLE
MAGNETISING DURATION
The period of magnetisation is adjustable, as is the number of shots.
This is a useful facility for small parts to avoid overheating.
MICROPROCESSOR
CONTROL SYSTEM
By interactive display the EUROMAG Control System
allows selection and adjustment of all magnetising parameters and
other functions by means of single simple rotary control and Enter
button.
PROGRAMMABILITY
Once a set of parameters has been entered it can be stored under
a simple code identified with a particular component or technique.
Recall of this program will automatically make the necessary adjustments
to the parameters. This system avoids mistakes in work in which
repeated and frequent adjustments by the operator are necessary.
SEPARATE
POWER PACK
In conformance with current safety requirements all high voltage
components are housed in a rigid steel enclosure. The enclosure
may be situated next to main frame or within it.
DUTY
CYCLE MONITORING
In common with all equipments of a similar nature the high power
system is not constantly rated. To obtain maximum duty from the
EUROMAG a system is included which allows continuous rating until
the temperature rises above the threshold. Then a delay is imposed
between shots, which increases with rising temperature. This is
instead of the normal practice of a fixed delay which is inconvenient
and unnecessary in most testing circumstances.
AUTOMATIC
DEMAGNETISING
Rapid automatic demagnetisation, using reducing 16 2/3 Hz A.C.,
is possible in all the magnetising modes. The demagnetising cycle
automatically starts at a point 10% higher than the magnetising
value. Units which have a F.W.D.C. facility include demagnetisation
by reducing, reversing polarity pulses of DC at a frequency of 0.5
Hz.
MULTI-DIRECTIONAL
MAGNETISING
To
ensure complete inspection of the part, conventional magnetic particle
inspection normally requires at least two separate magnetisings,
the second magnetising at 90o to the first. In some complex shaped
components even more shots are necessary. Examination of the surface
for defect indications is required after each magnetising therefore
the complete process can take considerable time.
With
the Insight NDT technique of phase shifted multi-directional magnetising
all defects, regardless of their direction on the surface, will
be indicated in a single shot therefore needing only one inspection.
Considerable time can therefore be saved and adjustment errors avoided.
TECHNICAL
DATA
STANDARD
- EUROMAG
1000 to test pieces up to 1 metre (40") long/300mm (12")
diameter
- EUROMAG
1500 to test pieces up to 1.5 metres (60") long/300mm (12")
diameter
- EUROMAG 2500
to test pieces up to 2.5 metres (100") long/300mm (12")
diameter
CONSTRUCTION
A fabricated rectangular section steel frame which has rails extending
the full length of unit, to support the fixed headstock and adjustable
tailstock. Beneath the work area is a stainless steel tray to collect
surplus indicating fluid.
HEADSTOCK
Is fixed to the left end of unit, it has a pneumatically operated
steel backed copper faced contact pad and a stroke of 50mm. The
power pack connection is directly to copper pad. Magnetic flux flow
versions have a pole piece of iron laminations wound with induction
coil.
TAILSTOCK
Has a similar construction to headstock, and is mounted on carriage
running along the support rails. It can be locked at any position,
with positive pinion lock. The Contact pad construction identical
to Headstock.
MAGNETISING
COIL
Has a 250mm diameter aperture with three or five turns of copper
conductor wound on rigid former. It is mounted on carriage, to allow
positioning at any location between Headstock and Tailstock, with
positive lock.
INDICATING
FLUID SYSTEM
All parts of system non-ferrous. A sloping tank is provided along
the length of the unit which drains into the separate ink storage
and agitation tank via a coarse filter. Mounted within this agitation
tank is a spraybar assembly, which is pressurised by a pump mounted
on the side of the tank and maintains the particles in suspension.
A drain plug is fitted to the agitation tank which is withdrawable
from the front of the machine to allow convenient cleaning and maintenance
The
output from the pump is coupled to the agitation spraybar and the
hand applicator hose on the unit as well as the automatic inking
arrangement if provided.
POWER
PACK
Is a separate enclosure adjacent to magnetising unit. It is constructed
in robust frame with removable panels and incorporates the control
system and containing the main 3000 amps A.C. (nominal) transformer
to class E, heavy duty contactors including infinitely variable
thyristor output regulator, current pre-selection and automatic
16 2/3 Hz demagnetising system.
CONTROL
SYSTEM
Is integral within the power pack or mounted on a boom and is microprocessor
based. It includes an interactive display, test parameter adjustment
rotary control and confirmation button. Other controls include Magnetise
and Demagnetise buttons and Emergency Stop together with indicator
lamps.
The control software allows the adjustment of the magnetising parameters,
create, store and recall technique programs and to manage the current
pre-selection system. Also included on the display is a four digit
LED ammeter, with reading hold facility, to indicate actual output
current. The calibration of the system is traceable to National
Standards.
OPTIONAL
FACILITIES AVAILABLE
HALFWAVE
RECTIFIED D.C.: To detect subsurface defects.
MULTI-DIRECTIONAL
MAGNETISING: To detect defects in all directions in a single magnetising shot.
An additional transformer powered from different phase to that of
the main transformer, together with the necessary control system,
all housed in the power pack.
MAGNETIC
FLOW: Provides an alternative longitudinal magnetising method, but without
the use of a coil, for A.C. or H.W.D.C. waveforms. The head and
tailstock design to include laminated iron pole pieces wound with
coil.
UPGRADED
POWER PACK: To provide variable output current up to 6,000, 10,000, 15,000 and
20,000 amps true peak (nominal).
FULL
WAVE THREE PHASE RECTIFIED DIRECT CURRENT: For detection of subsurface defects.
MAGNETISING
COILS: 350mm I/D, 550mm I/D or a custom I/D, both continuous or split and
hinged
VIEWING
BOOTHS AND CANOPIES
MOTORISED
PART STEADY RESTS
MOTORISED
COIL AND TAILSTOCK
MOTORISED
CANOPIES
FOR
MORE INFORMATION PLEASE SEE: DC
OR AC WAVEFORMS IN MAGNETIC PARTICLE INSPECTION (PDF format)
from our Technical Papers Library
To obtain this
information as an Adobe Acrobat document Click
Here.
|
