Solutions for magnetic particle crack testing (MT testing) and demagnetization of steel components based on direct-current pulse technology
HPT Hirsch Prüftechnik GmbH
ZweibrückenNew on Amplifa
About us
HPT Hirsch Prüftechnik GmbH, based in Zweibrücken, specializes in magnetic particle testing (MT testing) and demagnetization of steel components. The core of the technology is a direct-current pulse-based process developed by Dr.-Ing. Peter Hirsch: capacitor discharges generate high-energy pulse currents that reveal cracks as stray fields – with test results available after as little as around three seconds. The company offers testing equipment and testing services, including the 4-pole method with direct current flow for flat components, the combined method for rotationally symmetric components, and a contact-free method with crossed coil fields. This even allows multi-ton steel components to be tested non-destructively and permanently demagnetized. Fields of application include structural steel construction, shipbuilding and submarine construction, and the manufacturing industry. The technology was based on Hirsch's research and development work in submarine construction from 1980 to 1989.
- Site
- Zweibrücken
- Processes
- Magnetic particle testing (MT testing) with direct-current pulse technology, Demagnetization with direct-current pulses (decreasing intensity, alternating polarity), Magnetization with the 4-pole method (direct current flow) for MT testing and demagnetization, Magnetization with the combined method (direct current flow + coil magnetization), Contact-free MT testing and demagnetization with crossed magnetic fields (coils crossed at ≥30°), Contact-free magnetic particle testing of multi-ton steel components, Magnetic particle crack testing (MT testing), Demagnetization
- Materials
- Steel, Magnetic particle testing (MT testing) with direct-current pulse technology, Demagnetization with direct-current pulses, 4-pole method (direct current flow), Combined method, Contact-free method
- Industries
- Structural steel construction, Shipbuilding and submarine construction, Manufacturing industry, Submarine/shipbuilding
- 01
Consultation and inquiry
- 02
Magnetization of the steel component with direct-current pulses
- 03
MT testing with test medium under UV light
- 04
Evaluation of the crack indications
- 05
Demagnetization
- 06
Delivery of testing equipment or performance of testing services
Processes & Materials
Magnetic particle testing (MT testing) with direct-current pulse technology
Non-destructive crack testing of steel components with results after approximately 3 seconds.
Demagnetization with direct-current pulses
Permanent demagnetization through pulses of decreasing intensity and alternating polarity.
4-pole method (direct current flow)
For flat components, usable for MT testing and demagnetization.
Combined method
Direct current flow plus coil magnetization for rotationally symmetric components.
Contact-free method
Crossed coil fields (at least 30°) for compact components of various geometries, without clamping.
Steel
Material of the components tested and demagnetized.
Location
Zweibrücken
DEHeadquarters, development and testing services
- Part weight / size
- multi-ton steel components
- Materials
- Steel
- MT testing device (direct-current pulse basis, capacitor discharge)
- MT testing table (contact-free testing of multiple components for longitudinal and transverse defects)
Components
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Magnetic particle testing (MT testing) with direct-current pulse technologyTesting | – | – | – | – | Steel |
| Demagnetization with direct-current pulses (decreasing intensity, alternating polarity)Testing | – | – | – | – | Steel |
| Magnetization with the 4-pole method (direct current flow) for MT testing and demagnetizationTesting | – | – | – | – | Steel |
| Magnetization with the combined method (direct current flow + coil magnetization)Testing | – | – | – | – | Steel |
| Contact-free MT testing and demagnetization with crossed magnetic fields (coils crossed at ≥30°)Testing | – | – | – | – | Steel |
| Contact-free magnetic particle testing of multi-ton steel componentsTesting | – | – | multi-ton | – | Steel |
2 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| MT testing device (direct-current pulse basis, capacitor discharge) | Hirsch Prüftechnik | – | – | – | Zweibrücken |
| MT testing table (contact-free testing of multiple components for longitudinal and transverse | Hirsch Prüftechnik | – | – | – | Zweibrücken |
Additional services
History
- 1980–1989
Dr.-Ing. Peter Hirsch in research and development in submarine construction; foundation for the development of direct-current pulse-based MT testing
- 2006
Awarded the Rhineland-Palatinate Inventor Prize
- 2010
Henry Hirsch joined the company