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Electron beam welding method

A technology of electron beam welding and electron beam current, which is applied in the direction of electron beam welding equipment, welding equipment, cleaning methods and utensils, etc.

Active Publication Date: 2011-01-19
北京力威尔航空精密机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During this kind of welding, defects such as air holes, welded edges, unmelted and burn-through will appear.

Method used

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Embodiment Construction

[0025] First of all, ultrasonic cleaning is performed on workpieces with only a small amount of oil on the surface but no scale, that is, ultrasonic cleaning with water agent is used to remove the grease on the surface of workpieces 1 and 2. The cleaning time is usually 20-30 minutes. The cleaned workpieces 1 and 2 are taken out and dried. Then the workpieces 1 and 2 are put into the solution and soaked for 30-40 seconds and then taken out to remove the oxide layer on the workpieces. Here, the solution adopts an aqueous solution of hydrofluoric acid and nitric acid. In this solution, the concentration of hydrofluoric acid is 2g / L, the specific gravity of nitric acid used is 1.42g / L and the concentration of this nitric acid is 400g / L. The use of this solvent is more conducive to removing the oxide film on the workpiece, and the solution will not have adverse effects on the workpiece.

[0026] Then, the workpieces 1 and 2 taken out from the solution are immediately placed in a...

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Abstract

The invention provides an electron beam welding method for welding a short cylindrical workpiece and a sheet workpiece together, which comprises the following steps: washing welded workpieces; press-mounting the workpieces to be welded with each other; placing the washed workpieces in a vacuum chamber, and vacuumizing the vacuum chamber; performing the positioning welding by using 2 to 6mA, preferably 3 to 5mA of electronic beam current; and performing keyhole welding by using 15 to 22Ma, preferably 18 to 22Ma of electronic beam current .

Description

technical field [0001] The invention relates to an electron beam welding method, which includes cleaning workpieces to be welded before welding, putting the cleaned workpieces into a vacuum chamber, and then evacuating the vacuum chamber. Background technique [0002] Electron beam welding is to bombard the metal to be welded by the high-energy electron flow gathered and accelerated by the high-voltage electrostatic field, so that the kinetic energy of the electron flow is converted into heat energy, and the heat required for welding is generated in the workpiece to be welded, so that the workpiece to be welded is melted to form a weld. seam. [0003] Chinese patent 200410013759.X discloses an electron beam welding method for a diaphragm of a steam turbine. According to this method, both the vacuum degree of the welding chamber and the welding torch are high, and the welding speed and electron beam current are relatively high. This method is suitable for welding the bulkh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K15/06B08B3/12B08B3/08
Inventor 任思
Owner 北京力威尔航空精密机械有限公司