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Apparatus and methods for reducing the ambient magnetic field strength to facilitate arc welding

A technology of arc welding and magnetic field, which is applied in arc welding equipment, welding equipment, manufacturing tools, etc., and can solve problems such as high coil inductance, inability to track and prevent arc blowing, low response, etc.

Inactive Publication Date: 2013-02-27
DIVERSE TECH & SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high field required to overcome the field from the molten conductor would require many turns to operate at reasonable currents which results in high coil inductance and low response making this technique unable to track and prevent arc blow

Method used

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  • Apparatus and methods for reducing the ambient magnetic field strength to facilitate arc welding
  • Apparatus and methods for reducing the ambient magnetic field strength to facilitate arc welding
  • Apparatus and methods for reducing the ambient magnetic field strength to facilitate arc welding

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Embodiment Construction

[0067] The current flowing in the conductor generates a proportional magnetic field. In certain industrial applications, such as smelting, the currents flowing are very high, resulting in very high magnetic fields.

[0068] exist figure 1 , a current of 350,000Amps flows through 0.64m in the x-direction 2 cross section 1. This current causes the magnetic field on surface 2 to be -0.15Tesla in the y direction, and similarly, surface 3 will have a magnetic field of 0.15Tesla in the z direction. The magnitude and direction of the magnetic field becomes more complex at the corners 4 when the guide rods are not linear and in regions where two or more guide rods are in close proximity. In smelting and electrolysis applications, it is necessary to perform welding repair operations on and near these electrical conductors when high currents are flowing. High magnetic fields cause deflection of charged particles in the welding arc, making such operations difficult and making the qua...

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PUM

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Abstract

Apparatus for reducing the strength of an ambient magnetic field in a weld region comprises a magnetic field generator (50, 52, 54, 56) for generating an opposing magnetic field in the weld region in response to an input current, a magnetic field sensor (140) for sensing the direction and the magnitude of an ambient magnetic field in any vector direction in the weld region and outputting a sensor signal in response thereto, and a controller (7) arranged to receive the sensor signal and control the input current to the magnetic field generator in response to the sensor signal so as to generate the opposing magnetic field which reduces the magnetic field in the weld region. Methods for reducing the magnetic field in a weld region using apparatus of this form are also provided.

Description

technical field [0001] The present invention relates to the formation of low magnetic field zones in high ambient megnetic fields to facilitate arc and charged particle welding. Background technique [0002] Arc welding technology is affected by magnetic fields, and the quality of the weld is degraded when high magnetic fields are present. For example, for manual metal arc welding, magnetic fields in excess of 0.005Tesla are often problematic and a process called arc wander occurs. At higher magnetic fields, the arc becomes unstable, leading to a process known as arc blow. [0003] Industrial processes for extracting metals such as zinc and aluminum employ large smelting currents, typically 350,000 Amps. In such an environment, the local magnetic field of a guide rod carrying such a current is 0.2 Tesla or greater. For practical reasons, the smelting current cannot be switched off, so welding must be performed in a high magnetic field. Welding repair work in such an envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/08B23K9/073
CPCB23K9/08B23K9/0737
Inventor S·A·L·福尔兹J·D·安德森
Owner DIVERSE TECH & SYST