Systems and methods for generating plasma shields

Patent metadata

Field	Value
Publication number	US-11938564-B2
Application number	US-202117229296-A
Country	US
Kind code	B2
Filing date	Apr 13, 2021
Priority date	Apr 13, 2021
Publication date	Mar 26, 2024
Grant date	Mar 26, 2024

Abstract

This specification describes systems, methods, and architectures related to generating a plasma shield for laser operations. An example system for generating a plasma shield includes a laser head for directing a laser beam towards a target area on a workpiece. The path of the laser beam from the laser head to the target area on the workpiece is substantially surrounded by a plasma shield, which may form a gas-impermeable barrier. The plasma shield is configured to prevent the ingress of atmospheric or environmental gases, for example oxygen, into an area which would allow the gas to be in contact with the area of the workpiece being interacted with by a laser beam. The shape or location of the plasma shield may be controlled or altered using a magnetic field.

First claim

What is claimed is:

1. A method for creating a plasma shield surrounding a laser beam configured to modify a characteristic of a workpiece, the method comprising:
generating the laser beam, wherein the laser beam is configured to modify the characteristic of the workpiece;
generating a magnetic field around the laser beam and a target area of the workpiece;
injecting a plasma into the magnetic field;
altering a location or a shape, or both, of the magnetic field based on a surrounding environment using a control system comprising an artificial intelligence module; and
generating, using the injected plasma and the magnetic field, the plasma shield around the laser beam and the target area.

2. The method of claim 1 , wherein the plasma is a cold plasma.

3. The method of claim 1 , wherein the method comprises generating the plasma shield impermeable to gas.

4. The method of claim 1 , wherein the method comprises purging a path of the laser beam of debris with a gas.

5. The method of claim 1 , wherein the method comprises generating the laser beam using a fiber laser.

6. The method of claim 1 , wherein the method comprises:
generating the magnetic field using one or more electromagnets; and
moving the one or more electromagnets to alter a location or a shape, or both, of the magnetic field.

7. The method of claim 1 , wherein the plasma shield is a static plasma shield.

8. The method of claim 1 , wherein the workpiece comprises or generates a flammable material.

Assignees

• Saudi Arabian Oil Co

Inventors

• Tulbah Faris Hasan
• Lastra Melo Rafael Adolfo

Classifications

• B23K26/142 Primary

  for the removal of by-products · CPC title

• B23K26/1462

  Nozzles; Features related to nozzles · CPC title

• H05H1/341

  Arrangements for providing coaxial protecting fluids · CPC title

• H05H1/40

  using applied magnetic fields, e.g. for focusing or rotating the arc {(cf. B23K9/08, B23K9/073)} · CPC title

• B23K26/00 Primary

  Working by laser beam, e.g. welding, cutting or boring · CPC title