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Magnetic Particle Testing
Magnetic particle testing of magnetizable metals (mostly steel, less often nickel or cobalt), is well acknowledged by experts. For the inspection the object must be magnetized. In case of large components, which cannot be magnetized completely, only the inspection zone is magnetized.
Magnetic field lines which are generated by the magnetization process flow parallel to the surface in the component. Cracks with a perpendicular orientation in relation to the field lines disturb these and create a leakage flux: The field lines exit on one side and enter into the material on the other side, thus creating magnetic poles on the two side of the crack. When iron powder is dispersed on this area, it conglomerates above the crack because it is drawn by the magnetic poles.

Cracks with a parallel orientation in relation to the field lines cannot be detected because they do not generate a leakage flux. Covered cracks below the surface can be localized down to a certain depth of approximately 1 mm.

The magnetization is achieved either by magnetic field penetration or by feeding an electric current through the component to be tested. Both methods can be combined, to enable a crack localization in all orientations.
 
Magnetic Field Penetration :


In this case the object is clamped into a yoke which is magnetized by means of electrical coils. Thus, a magnetic field is generated in the longitudinal direction of the object and cracks which are oriented perpendicularly to the field (i.e. transverse cracks) produce a leakage flux and are indicated.
Electric Current Magnetization :


Depending on the inspection task also longitudinal cracks must be detected. For this purpose a second type of magnetization is applied: An electric current flows through the component and generates an annular magnetic field. This method enables the localization of longitudinal cracks.
Combined Magnetization :


Often the cracks do not have a predominant direction. Mass products, e.g. in the automotive industry are usually inspected in stationary testing machines, which permit either the magnetic field penetration, the electric current feeding or a combination of both at the same time, so that cracks of all orientations can be detected.
Other Products
UWE 350

Standard bench for common applications: The version 350 provides a clamping length of 350 mm for forgings and cast iron parts.

The new universal magnetic bench UWE 350 was specifically developed for casted and forged components with a maximum length of 350 mm. The maximum testing current is 2000 A.The yokes are moved by a centric spindle which is splash-protected from the magnetic agent.

Specimen Data: Max. length: 350 mm Max. diameter: 300 mm Max. weight: 25 kg

Current flow: Max. testing-current: 2000 A Open circuit voltage: 3.5 V Continuously adjustable Analogue ampere meter Minimum value supervision

Field flow: open yoke construction 10000 amp-turns, flux density > 1 T Continuously adjustable Analogue instrument

Demagnetization: Demagnetization for both directions, each circuit is switchable Triggering switchable: by hand/automatic Demagnetization frequency: 50 Hz Demagnetization time: approx. 1 s
 
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Magnetic Particle Test Bench

Standard bench for common applications: The versions 600/900 provide a clamping length of 600/900 mm for forgings and cast iron parts.

This flaw detector uses the skin effect of a AC for uniform magnetization and demagnetization without problems, even in case of complicated workpieces. Two phase-shifted AC currents generate a rotating magnetic field; thus cracks of any direction are indicated in a single process.

Operating errors are impossible by automatic cycle sequence (clamping, spraying, magnetizing, re- and demagnetizing). Electronic and pneumatics modules from world-wide well-known manufacturers guarantee highest operational reliability and service, even after many years.

Flanged switch cabinet, well accessible for operation and service. Each spraying shower individually switched on and off: short spraying times and no dribbling. Mechanical guidance outside the wet area, no varnished parts.Stainless steel in the wet area, powder coating outside.

Component Data: Max. length: 600 mm (UWE 600) / 900 mm (UWE 900) Max. diameter: 400 mm Max. weight: 100 kg

Current Flow: Max. testing current: 2000 A No-load voltage: 5 V Adjustment: infinitely variable Display: kA, analogue Flow monitoring: 1 limit value

Field Flow: Max. flow density: > 1 T, Number of Ampere turns required for this: 10000 (UWE 600), 14000 (UWE 900) Adjustment: infinitely variable Display: % per cent Ampere turns, analogue

De-magnetization: Included serially; both directions can be switched off Release may be selected manually or automatically De-magnetizing frequency: 50 Hz De-magnetizing time: ca. 1 s
 
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Magnetic Particle Test Bench

Test bench with moving coil for long components, Standard machine DEUTROFLUX UWS with moveable motor-driven coil, to ensure a high and constant testing sensitivity for the entire workpiece surface. For workpieces with 1000 mm to 3000 mm length (500 mm steps) and a maximum weight of 500 kg (UWS 1000, UWS 1500, UWS 2000) respectively 1000 kg (UWS 2500, UWS 3000).

Two phase-shifted AC currents generate a rotating magnetic field. Thus, cracks of every direction are detected.The crack detection uses the skin effect of an AC current for a uniform magnetization and demagnetization without problems, even in case of complicated workpiece geometries.No operating errors due to automated test cycle (clamping, spraying, magnetizing, post-/demagnetizing, de-clamping).Electronic and pneumatic modules from worldwide, well-known manufacturers guarantee highest operational reliability and service, even aftermany years.
 
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DEUTROMAT Multi-Contact

This type of machine allows for testing of parts with complex shape which usually cannot be magnetized in their entirety with the aid of only two contacts in one testing cycle and thus may be tested efficiently by multi-contact machines. Typical components comprise knuckles, pistons and furcated parts.

The entire component surface is supposed to be magnetized as uniformly as possible. Each magnetic contact is adjustable individually so the values of the required field strength comply with the standardized provisions (2 - 6 kA/m). The inspection may be executed at components with either real or artificial test flaws. If there are no obstacles with respect to the shape of the specimen discharge is carried out via a pneumatic ejector. The parts then usually slide onto a conveyor belt which ends in the inspection cabin.
 
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DEUTROPULS Prods

Portable high current generators for connection of current poles, in different power classes a mobile crack examination with alternating current or half cycle direct current can be carried out with the DEUTROPULS current generators. The generators provide an infinitely variable current strength and are usable universally. By means of a large, comfortably readable display unit the current amperage can be tracked at any time.
 
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DEUTROPULS Hand Yokes

The DEUTROPULS Hand Yoke is a mobile yoke for magnetic particle inspection with extra magnetization performance, easy handling and for miscellaneous applications. The robust design allows reliable magnetic particle crack detection also under harsh conditions. The mechanical design takes the highest safety demands into account. The instrument is fully sealed with high-quality casting resin against humidity. The optimal positioning onto the different workpieces is possible with the help of interchangeable extended, angled or flexible attachment poles respectively.
 
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