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4644272 |
Hot annealed weld inspection
An eddy current system and method for hot annealed weld inspection is disclosed for use on metallic workpieces such as steel pipe. An annealer produces strong alternating fields to heat the weld. A...
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4641092 |
Rotary probe apparatus for detecting flaws in a test object
A flaw detection apparatus for detecting flaws at the outer surface of a product, such as a steel bar, wire or steel pipe, which is round in section and produced by the hot rolling, by use of a...
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4634976 |
Barkhausen noise method for stress and defect detecting in hard steel
A sensor for a system that detects stresses and defects in a metal piece by employing the Barkhausen phenomenon enables static or dynamic testing of such metal pieces as hard steel in which only...
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4628261 |
Method and apparatus for separating magnetic field attributable to flaws in a material from magnetic fields attributable to other phenomena
A method and an apparatus for testing materials using the eddy current principle enables a better exploitation of the sensitivity of measurement. Initially, the complex values appearing during a...
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4602212 |
Method and apparatus including a flux leakage and eddy current sensor for detecting surface flaws in metal products
A technique for detecting flaws in a metal product which uses a combined eddy current and magnetic flaw detection technique. A first magnetic field having flux lines parallel to the surface of the...
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4598250 |
Corrosion sensor device including side-by-side bar magnets surrounded by a coil
A corrosion probe is disclosed which includes two permanent bar magnets in side-by-side relation, with opposite magnetic orientation and with poles of opposite polarity adjacent a sensing end of...
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4591785 |
Method for detecting soft spots in the hardness of steel casing
A method of measuring hardness in steel casing to detect soft spots. A magnetizing force is generated and traversed along the length of the steel casing. A flux density is created along those...
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4573012 |
Method and apparatus for measuring core loss of a laminated ferromagnetic structure
A core loss tester employs separate cables for excitation and pickup. Testing is performed at a fixed flux density in the ferromagnetic core. A processing circuit on the output of the pickup coil...
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4564809 |
Eddy current test method with degree of amplification selected in accordance with a compensation signal
A method and an instrument for testing materials using the eddy current principle, at different frequencies depending on the output quantity of a coil system, compensation values are generated...
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4551677 |
Apparatus and method for inspecting a bearing ball
A method and apparatus for inspecting the surface of a bearing ball is disclosed which includes a base (A) having a high friction non-abrasive base scanning surface (12). A holding device (B)...
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4547962 |
Method of making eddy-current probes
In a new method of manufacturing eddy-current probes, particularly such probes for the scanning of a test surface generated by a non-flat profile, a thin, flexible support layer is laid against the...
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4546316 |
Magnetic testing device for supported objects
The present invention relates to a testing device for magnetically testing while uninterruptedly moving along an elongated magnetically permeable object having intermittent supports to one side...
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4534405 |
Method and an arrangement for inspecting the surface of steel stock having a temperature above the Curie point
There is disclosed a method and arrangement for inspecting the surface of steel stock having a temperature above the Curie point. In order to detect, with a great certainty and accuracy, defects in...
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4528506 |
Ferromagnetic resonance probe liftoff suppression apparatus
A liftoff suppression apparatus utilizing a liftoff sensing coil to sense the amount a ferromagnetic resonance probe lifts off the test surface during flaw detection and utilizing the liftoff...
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4510447 |
Inspection apparatus for electromagnetically detecting flaws in the wall of a pipe
Apparatus for detecting flaws in the wall of a ferromagnetic pipe is disclosed. The apparatus comprises an electromagnetic having poles in slideable contact with the surface of the wall of the...
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4507610 |
Apparatus for electromagnetically detecting flaws in metallic objects
Nondestructive method of electromagnetically detecting flaws in a metallic object, comprising: placing an object to be tested for flaws adjacent a sensing head which comprises a portion of a sensor...
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4481471 |
Method and apparatus for the detection of anomalies in rotating members
A detector operable to detect cracks in a rotating member generates an alternating eddy current in the rotating member with an external coil surrounding the rotating member. A pick-up coil senses...
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4461995 |
Cooling method and apparatus for eddy current flaw detection
An eddy current system and method is disclosed for detecting flaws in hot pipe product. The system includes a detector test head (22) having a heat shield (24) defining a generally cylindrical...
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4445088 |
Method and arrangement for evaluating a defect signal by comparing the ratio of maximum signal rise and maximum signal magnitude to a predetermined value
Voltage signals induced in a magnetic probe by stray flux at the location of a defect in a test piece are monitored determining the maximum signal magnitude and maximum signal rise. A quotient of...
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4427940 |
Electromagnetic inspecting apparatus for magnetizable wire rope
An electromagnetic inspecting apparatus for electromagnetically detecting a defect present in a magnetizable wire rope moving in its longitudinal direction is disclosed. The apparatus comprises a...
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4409549 |
Carriage mounted apparatus for detecting surface defects in flat surfaced metallic objects
The invention concerns apparatus for inspecting the flat surfaces of a metal billet and includes a carriage mounted scanning head having a high frequency eddy-current probe (21) mounted on the...
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4383218 |
Eddy current flow detection including compensation for system variables such as lift-off
Disclosed is an eddy current inspection system for nondestructive detection of subsurface flaws in regions of multilayer conductive structure that surround a fastener which joins the conductive...
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4379261 |
Rotating magnetic field device for detecting cracks in metal
An eddy current type of inspection device having input signal coils on cores radially arranged around a center and having outer ends of the cores which rest against a surface of a metal assembly to...
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RE31109 |
Single magnetic stray field sensor whose signals are differently attenuated in two channels and then compared
The described tube testing apparatus indicates whether a defect is either external or internal, enabling a quantitative classification of defects and an analog representation on location of the...
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4352065 |
Nondestructive electromagnetic inspection of pipelines incorporated in an electrically closed loop
The method according to the invention comprises producing an alternating magnetic flux coupled to an electrically closed loop which includes a pipeline to be checked, and measuring at least on...
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4347622 |
Signature surveillance of nuclear fuel
Typical nuclear fuel material contains tramp ferromagnetic particles of random size and distribution. Also, selected amounts of paramagnetic or ferromagnetic material can be added at random or at...
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4331919 |
Apparatus for magnetic testing ferromagnetic sheet or strip material using rectangular coils
Apparatus for magnetic testing of sheet or strip includes a magnetizing system comprising spaced arrays of substantially parallel rectilinear conductors supported adjacent the plane of sheet or...
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4322683 |
Control apparatus for eddy current non-destructive testing using a digital compensating circuit
Digital apparatus for controlling members by eddy currents comprising a sensor constituted by a primary winding and a secondary winding, an exciting sinusoidal voltage generator, a correcting...
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4303885 |
Digitally controlled multifrequency eddy current test apparatus and method
Digitally controlled eddy current test apparatus for detecting flaws, their extent and location. The apparatus provides absolute and differential measurements. The apparatus employs...
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4297636 |
Magnet and probe mounting means on a rotating head of magnetic defect testing apparatus
The described rotating head effects A.C. field stray flux defect testing process using a rotating magnet yoke for high magnetizing field strength. The unit is compact and replaces a great number of...
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4271393 |
Apparatus and method for eddy current detection of subsurface discontinuities in conductive bodies
Nondestructive evaluation of conductive materials is disclosed wherein a magnetic field having a relatively slow rise time and a relatively fast fall time induces eddy currents in the conductive...
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4209744 |
Eddy current device for automatically testing the quality of elongated electrically conductive objects by non-destructive techniques
An automatic eddy current inspection system for discrimination of defects in elongated parts made of conducting materials comprises an alternating current generator connected in series to an...
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4170755 |
FM transmitter and receiver for use with non-destructive testing apparatus including a moveable head
Transducer means mounted on a moving head produce test signals which modulate an FM transmitter on the moving head. A stationary FM receiver has demodulation means including a toggle flip-flop...
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4144494 |
Method of magnetically testing tubes during welding wherein the same magnetic field is used both for heating and testing
In electromagnetic testing method for tubes is disclosed, which is used during continuous production of tubing from strip being formed into a tube followed by welding the adjoining edges. A...
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4123708 |
Method and apparatus for eddy current inspection of hot test pieces with means to cool the detector and to purge the test path of contaminants
An eddy current flaw detection apparatus which is particularly adapted for inspecting articles at elevated temperatures. A plurality of detectors are supported about at least a portion of a...
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4083002 |
Method and apparatus for measuring cross sectional area and weight per unit length of elongated, conductive material by magnetic field displacement
A method and apparatus is disclosed whereby a solenoid coaxially surrounding an elongated electrically conducting material generates a radio frequency magnetic field of such a frequency that the...
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4072894 |
Rotating pipeline inspection apparatus
Inspection apparatus adapted to be propelled through a pipeline. Means are provided to establish a circumferentially directed flux field in wall of pipe, and longitudinally extending flexible fins...
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4035721 |
System and method using magnetic tape for testing of small cylindrical parts
The invention relates to a system and method of testing small cylindrical parts wherein a part is journalled for free rotation about a substantially stationary axis with one side of the part being...
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3988665 |
Eddy current test coil assembly using printed circuit conductor means
An eddy current coil test assembly comprises a printed circuit board having respective conductors which form the excitation coil winding, the sensing coil winding, the input transformer winding,...
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3694740 |
SYSTEM FOR THE MAGNETIC NON-DESTRUCTIVE TESTING OF MATERIALS FOR LONG AND SHORT DEFECTS
A system for electroinductively testing elongated products comprising; a coil system for detecting short defects as seen in the longitudinal direction of the product and inducing a magnetic field...
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3580056 |
NONDESTRUCTIVE, RESONANT TESTING APPARATUS WITH MAGNETIC PICKUP
A casting under test is placed in a magnetic field and struck with a hammer causing the casting to vibrate at its resonant frequency. There is a pickup coil disposed in the field to sense...
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3443212 |
PULSED ELECTROMAGNETIC TESTING DEVICE WITH SAMPLING MEANS
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3437917 |
METHOD OF AND APPARATUS FOR HIGH SPEED MAGNETIC INSPECTION OF TUBULAR GOODS
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3273055 |
Constant impedance dual circuits for sample material flaw detection
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3268805 |
Seam tracking and flaw detection
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3262123 |
Method for testing and grading elongate members
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3242426 |
Magnetic testing probe with mutually perpendicular energizing and pickup coils, the latter surrounding the former
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3237446 |
Selective defect detection and thickness measuring method and apparatus
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3229197 |
Pulsed electromagnetic field system for nondestructive testing
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3189817 |
Device for testing metal sheets by measuring the time required for electromagnetic pulses to pass therethrough
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