Pipe Demagnetization Coil for Welding Arc Blow Reduction
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Solution Overview
Problem
Magnetic forces in pipe sections, particularly in high-pressure steel pipes used in the oil and gas industry, cause arc blow, leading to production inefficiencies and weld defects, necessitating the reduction of residual magnetism before welding.
Innovation Solution
A device comprising a first and second end member with a connecting member and a helically arranged coil that can be positioned around a pipe section, allowing for the delivery of electrical current to reduce or eliminate magnetic forces, enabling efficient demagnetization of the targeted area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If welding is performed on pipe sections with residual magnetism, then welding can proceed without preliminary treatment, but arc blow occurs causing weld defects and production inefficiencies
Solution Approach 1:
The device applies demagnetization treatment before welding to eliminate residual magnetism in the pipe section. The coil generates a magnetic field that counteracts and neutralizes the residual magnetism, preventing arc blow during subsequent welding operations. This preliminary action ensures both welding efficiency and quality by removing the harmful magnetic field prior to the welding process.
2Adaptability or versatility
If a demagnetization device is designed to be removable and repositionable, then the device can be moved between different pipe sections, but the device structure becomes more complex
Solution Approach 1:
The demagnetization device is divided into multiple segments or sections that can be moved independently. The coil assembly is separated from the support structure, allowing the coil to be repositioned around different pipe sections while the support structure remains relatively stable. This segmentation enables the device to adapt to various pipe locations without requiring complete disassembly, balancing repositionability with structural simplicity.
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
The device effectively reduces or eliminates 70% to 100% of magnetic fields near the weld area, facilitating faster and more efficient welding by mitigating magnetic arc blow and improving weld quality.
Implementation Method 1
a coil configured to conduct electrical current; wherein the coil is positioned in a helical arrangement around the passageway along the at least connecting member, wherein the device is configured to be moved between a closed configuration and an open configuration, wherein in the closed configuration the coil is configured to surround piping
Data Source
AI summary
According to some embodiments, a device for reducing magnetic force along a section of piping comprises a first end member comprising an opening, a second end member comprising an opening, at least one connecting member extending between the first end member and the second end member, the at least one connecting member secured to both the first and second end members, wherein the at least one connecting member defines a passageway that generally aligns with the openings of the first and second end members, and wherein the passageway and the central openings of the first and second members are sized and otherwise configured to accommodate a pipe section. The device further includes a coil configured to conduct electrical current.