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Aluminum alloy thick plate vacuum electron beam three-step welding method capable of overcoming gas hole defect

A vacuum electron beam, aluminum alloy plate technology, applied in electron beam welding equipment, welding equipment, metal processing equipment and other directions, can solve problems such as easy generation of bubbles, improve the high temperature residence time, eliminate hydrogen hole defects, weld seam high quality effects

Inactive Publication Date: 2019-04-12
SHANXI FENXI HEAVY IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a three-step vacuum electron beam welding method for aluminum alloy thick plates that can overcome the air hole defects, and solves the technical problem that air bubble defects are easily generated in vacuum electron beam welding

Method used

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Embodiment Construction

[0012] The present invention is described in detail:

[0013] A vacuum electron beam one-step welding method for thick aluminum alloy plates capable of overcoming pore defects, comprising the following steps:

[0014] The first step is to take an aluminum alloy plate with a thickness of 25 mm, scrape the welding surface of the aluminum alloy plate with a scraper, wipe the welding surface with acetone, and let it stand for 20 minutes;

[0015] The second step is to use a vacuum electron beam welding machine, and use electron beam defocusing preheating welding on the two pairs of welding surfaces of the aluminum alloy plate. The welding parameters of the vacuum electron beam welding machine are set as follows: the welding acceleration voltage is 40 k volts, welding beam current is 100 mA, welding speed is 350 mm per minute, welding focus is upper focus +0.13, welding scanning pattern is set to "○", welding scanning frequency is 800 Hz, welding scanning amplitude is 1.0 mm , the...

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Abstract

The invention discloses an aluminum alloy thick plate vacuum electron beam three-step welding method capable of overcoming the gas hole defect. The aluminum alloy thick plate vacuum electron beam three-step welding method capable of overcoming the gas hole defect solves the problem that the bubble defect is easily generated during vacuum electron beam welding. A vacuum electron beam welding welding machine is adopted, and electron beam upper defocusing preheating welding is adopted for two butt welding faces of an aluminum alloy plate; large fusion depth hole penetrating welding is performed on the two butt welding faces of the aluminum alloy plate, and welding parameters of the vacuum electron beam welding welding machine are set as follows: a welding accelerating voltage is 40 kV, the welding beam current is 220 mA, the welding speed is 350 mm / min, the welding focus point is an upper focus point +0.13, the scanning pattern is in an O shape, the scanning frequency is 800 Hz, and the amplitude value is 1.0 mm; full penetration welding is implemented; and remelting modification welding is performed on the two butt welding faces of the aluminum alloy plate under a weld joint hot state, and a weld joint is subjected to heat preserving for 30 min under a vacuum state. Hydrogen holes formed in the weld joint are substantially lowered, and the weld joint quality is substantially improved.

Description

technical field [0001] The invention relates to a vacuum electron beam welding method, in particular to a vacuum electron beam welding method for welding an aluminum alloy plate with a thickness of 20-55 mm. Background technique [0002] When welding aluminum alloy plates, hydrogen atoms will enter the welding pool. Since hydrogen atoms have a high solubility in liquid metal, as the molten pool cools after welding, the solubility of hydrogen atoms will suddenly decrease, and the bubbles will form The three steps of nucleation, growth, and flotation escape from the surface of the molten pool; when the formed bubbles have no time to escape, they will remain in the solidified weld metal, forming pore defects. Vacuum electron beam welding is a high-energy beam welding process with high energy utilization rate, large weld depth-to-width ratio, narrow heat-affected zone, and effective control of welding stress and deformation; When the plate is welded, due to the fast welding spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K15/00B23K15/06
CPCB23K15/0033B23K15/0046B23K15/06
Inventor 汪卓然白亚东柴斐刘国廷杜孟开安海俊王国强毕振华李方赵学敏
Owner SHANXI FENXI HEAVY IND
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