Magnetostrictive Strip Deposition for Pipe Inspection
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Solution Overview
Problem
Current methods for inspecting long or hard-to-reach pipes using magnetostrictive effects face challenges such as adhesive degradation, damage during handling, and limited effectiveness in severe environments, leading to unreliable fault detection.
Innovation Solution
A process involving the deposition of two parallel magnetostrictive strips, one continuous and one discontinuous, on the pipe surface, using techniques like dynamic cold spraying or thermal spraying, to generate and detect guided ultrasonic waves without the need for external magnets, enhancing durability and fault detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is used to attach magnetostrictive material to the pipe surface, then the magnetostrictive effect can be achieved, but the adhesive degrades over time causing the material to detach and reducing reliability
Solution Approach 1:
The invention removes the adhesive layer from the system by directly forming the magnetostrictive material onto the pipe surface through thermal spraying. This eliminates the adhesive degradation problem entirely, as there is no adhesive to detach over time. The magnetostrictive material becomes an integral part of the pipe surface rather than a separately attached component.
Solution Approach 2:
The invention uses a thermal spray process that deposits magnetostrictive material in a durable, permanent manner directly onto the pipe surface. This creates a long-lasting solution that eliminates the need for periodic replacement of detached magnetostrictive material, effectively making the system maintenance-free for the service life of the pipe itself.
2Reliability
If magnetostrictive material is applied to the pipe surface, then fault detection is enabled, but the material is damaged during handling and stacking of semi-finished parts
Solution Approach 1:
The magnetostrictive material is applied to the pipe surface after the pipe has been manufactured and before final assembly, but crucially after any handling and stacking operations are complete. This timing ensures the material is not exposed to damage during manufacturing handling. The pipe is manufactured, inspected, and prepared, then the magnetostrictive coating is applied as a final protective and functional layer.
3Ease of operation
If external magnets are used to generate magnetic fields for magnetostrictive waves, then wave generation is achieved, but the device complexity increases and portability is reduced
Solution Approach 1:
The pipe itself serves as the magnetic circuit by utilizing its inherent ferromagnetic properties. The inspection device only needs to generate a pulsed magnetic field using a portable coil, and the pipe's own magnetic characteristics enable the magnetostrictive effect without requiring external permanent magnets or complex magnetic shielding. The pipe becomes part of the inspection system itself.
4Adaptability or versatility
If adhesive bonding is used to attach magnetostrictive strips, then the strips can be positioned on the pipe, but the bonding is insufficient under severe environmental conditions
Solution Approach 1:
The invention completely removes the adhesive bonding mechanism from the system. Instead of using adhesive to attach magnetostrictive strips, the magnetostrictive material is thermally sprayed directly onto the pipe surface, creating a metallurgical or mechanical bond that is far superior to adhesive bonding, especially under severe environmental conditions such as extreme temperatures, moisture, and vibration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides reliable and durable fault detection in ferromagnetic and non-ferromagnetic pipes, even under severe conditions, with improved positioning and geometry information on faults, and extended wave propagation distances.
Implementation Method 1
The magnetostrictive effect results from the property of ferromagnetic materials to change their dimensions when subjected to magnetic fields
Implementation Method 2
This mechanical wave W periodically deforms the portions of matter located under the second coil 22, which produces a pulsed electric current whose amplitude depends on the amplitude of the mechanical wave W (inverse magnetostrictive effect)
Implementation Method 3
A process involving the deposition of two parallel magnetostrictive strips, one continuous and one discontinuous, on the pipe surface, using techniques like dynamic cold spraying or thermal spraying
Data Source
Figure 1A~2B
Figure 3~4
AI summary
The invention relates to a method for preparing a part (10) so as to enable said part to be controlled by guided waves generated by the magnetostrictive effect. After being prepared, the part (10) has two parallel basic strips (41a, 41b) close together on a first portion (11) of the surface thereof, at least one of the strips (41a) being non-continuous, wherein each of the strips (41a, 41b) has magnetostrictive properties.