Electron beam welding technology improving aluminum-lithium alloy weld formation and improving joint quality

An electron beam welding, aluminum-lithium alloy technology, applied in electron beam welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of poor joint quality and unsatisfactory formation of aluminum-lithium alloy welds, etc., and meet the technical level requirements Not high, reduce welding heat input, effect of grain refinement

Inactive Publication Date: 2020-01-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Application Information

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Problems solved by technology

However, using the existing conventional fusion welding process, there are problems such as unsatisfactory weld formation and low joint quality when welding aluminum-lithium alloys.

Method used

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  • Electron beam welding technology improving aluminum-lithium alloy weld formation and improving joint quality
  • Electron beam welding technology improving aluminum-lithium alloy weld formation and improving joint quality
  • Electron beam welding technology improving aluminum-lithium alloy weld formation and improving joint quality

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment provides an electron beam welding process for improving the shape of the aluminum-lithium alloy weld seam and improving the quality of the joint:

[0022] Step 1, processing the aluminum-lithium alloy plate into a welding sample, and cleaning the sample.

[0023] Specifically, for an Al-Cu-Li aluminum-lithium alloy plate with a thickness of 3.5 mm, a welding sample with a size of 200 mm×150 mm×3.5 mm was processed by a wire electric discharge cutting method. The welded samples were strictly cleaned by chemical cleaning and mechanical cleaning methods to remove the oxide film and pollutants on the surface of the samples. The specific cleaning steps are as follows: first, wash with 10% NaOH solution for 2-3 minutes, rinse with water, and then use 15% HNO 3 Pickle with the solution for 3-5 minutes, take it out after the surface of the sample is bright, and rinse it with clean water; use mechanical methods to polish the area to be welded, wipe it clean with...

Embodiment 2

[0030] The technological process of embodiment 2-6 is basically the same as embodiment 1, difference is: when the first pass welding of step 2, embodiment 1 does not apply electron beam scanning in welding process; Embodiment 2 applies certain A linear electron beam scanning waveform of amplitude and frequency; Embodiment 3-6 applies a circular electron beam scanning waveform of a certain amplitude and frequency during the welding process. Wherein, the quasi-circle refers to a non-circular, closed and smooth circular curve. The specific electron beam welding process parameters of Examples 1-6 are shown in Table 1.

[0031] The electron beam welding process parameter of each embodiment aluminum-lithium alloy of table 1

[0032]

[0033]

[0034] The surface shape of each embodiment joint weld seam is as follows figure 1 as shown, figure 1 Among them, (a), (b), (c), (d), (e) and (f) are the macroscopic morphology of the Al-Li alloy joints of Examples 1, 2, 3, 4, 5 and 6...

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Abstract

The invention discloses an electron beam welding technology improving aluminum-lithium alloy weld formation and improving joint quality. The electron beam welding technology includes the steps that firstly, an aluminum-lithium alloy plate is machined into a welding sample, and the sample is cleaned; secondly, the sample is fixed in a vacuum chamber of an electron beam welding machine, primary welding is conducted, a butt joint manner is adopted, and quasi-circular electron beam scanning wave forms are applied in the welding process; and thirdly, a defocusing electron beam is adopted for conducting modification welding on the surface of an aluminum-lithium alloy electron weld completed in the second step. The electron beam welding technology has the beneficial effects that the technology process is simple, joint weld formation is good, and the joint quality is high.

Description

technical field [0001] The invention belongs to the field of welding technology, and relates to a welding process of an aluminum-lithium alloy, and mainly relates to an electron beam welding process for improving the formation of an aluminum-lithium alloy weld seam and improving the quality of a joint. Background technique [0002] As a new type of lightweight and high-strength structural material, aluminum-lithium alloy has excellent comprehensive properties such as low density, high specific strength and high specific modulus, good corrosion resistance and low temperature performance, and superplastic formability. Therefore, this type of alloy has broad application prospects in many fields such as aerospace, rail transportation, weapons and nuclear industry. In actual production, aluminum-lithium alloys are often used as welded structures. Due to the special chemical composition and microstructural characteristics of aluminum-lithium alloys, there are problems such as wel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K15/06C22C21/16
CPCB23K15/0033B23K15/006B23K15/06C22C21/16
Inventor 王少刚谢美蓉
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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