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Pulse gas metal arc welding technology of titanium-aluminium micro laminated composite

A pulsed melting electrode and gas shielded welding technology, which is used in manufacturing tools, welding equipment, arc welding equipment, etc., can solve the problems of large difference in melting point and coefficient of linear expansion, low mutual solubility of titanium and aluminum, and complex interface structure. Stable joint performance, low cost and high welding efficiency

Inactive Publication Date: 2015-03-25
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1) The mutual solubility of titanium and aluminum is low, and the melting point and linear expansion coefficient are greatly different. When the fusion welding method is used, the melting and mixing of titanium and aluminum alloy will lead to the formation of brittle intermetallic compounds in the fusion zone
[0004] 2) The tough and brittle materials of the micro-laminated matrix overlap alternately, and the interface structure is complex. Conventional welding methods can easily lead to cracks or lack of fusion. The requirements for welding parameter control are very strict
[0005] 3) The welded joint area has a large thermal brittleness, and the brittle intermetallic compounds produced cause stress concentration in the welded area, and the thermal stress or impact easily leads to cracks
When laser welding and electron beam welding are used to join titanium-aluminum micro-laminated composite materials, the assembly accuracy of the weldment is strictly required, and the equipment cost is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Titanium-aluminum micro-laminated composite material pulsed gas mixed gas shielded welding (P-GMAW), the thickness of the base metal to be welded is 1.5mm, the size of the welded plate is 180mm×120mm, and the two plates are butt welded.

[0026] The specific process steps of pulse MIG shielded welding are as follows:

[0027] (1) Aluminum-silicon alloy welding wire with a diameter of 1.0mm is used as the filler metal, and the surface of the welding wire is polished with sandpaper to reveal a metallic luster before welding. The chemical composition (mass fraction) of the aluminum-silicon alloy wire used is: Si 5.0%, Mg 0.06%, Cu 0.03%, Fe 0.02%, Cr 0.15%, Mn 0.12%, Ti 0.15%, and the rest is Al.

[0028] (2) Grind the butt joints of the titanium-aluminum micro-laminated composite plates with sandpaper, so that the metal luster is exposed at the joints to be welded; place the plates to be welded horizontally, and fix them with steel clamps without leaving any gaps. Solder...

Embodiment 2

[0033] Pulse molten electrode mixed gas shielded welding (P-GMAW) of titanium-aluminum micro-laminated composite box-shaped body corner joints, the thickness of the base metal to be welded is 2.0mm, the size of the welded plate is 140mm×140mm, and 4 allegro corner joints are formed. Box shape.

[0034] The specific process steps of pulse melting electrode mixed gas shielded welding of box-shaped body corner joints are as follows:

[0035] (1) Aluminum-silicon alloy welding wire with a diameter of 1.2mm is used as the filler metal, and the surface of the welding wire is polished with sandpaper to reveal a metallic luster before welding. The chemical composition (mass fraction) of the aluminum-silicon alloy wire used is: Si 5.5%, Mg 0.08%, Cu 0.04%, Fe 0.03%, Cr 0.16%, Mn 0.15%, Ti 0.18%, and the rest is Al.

[0036] (2) Sand the butt joints of the fillet welds of the titanium-aluminum micro-laminate composite plates with sandpaper, so that the metal luster is exposed at the jo...

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Abstract

The invention discloses a pulse gas metal arc welding technology of a titanium-aluminium micro laminated composite. The pulse gas metal arc welding technology comprises the following steps: thoroughly cleaning the surface to be connected of the titanium-aluminium micro laminated composite and the surface of the Al-Si alloy system solder wire before the welding, or polishing to reveal metallic luster, placing the titanium-aluminium micro laminated composite to be welded in a horizontal butting joint mode, carrying out welding by adopting pulse mixed gas metal arc welding, and carrying out natural cooling to a welded workpiece under gas shield after welding is completed. The pulse gas metal arc welding technology of the titanium-aluminium micro laminated composite has the advantages of being convenient to operate, high in welding efficiency, low in cost, easy to popularize and the like. By adopting the pulse gas metal arc welding technology of the titanium-aluminium micro laminated composite, a welding joint without flaw and brittleness can be obtained, the joint is stable in performance, the strength of extension of the welding joint is not lower than that of a pure aluminium base metal, and the using requirements to the welding structure members of the titanium-aluminium micro laminated composite in producing can be met.

Description

technical field [0001] The invention relates to a pulse melting electrode mixed gas shielded welding (P-GMAW) process of titanium-aluminum micro-laminated composite materials, which belongs to the field of welding technology of laminated composite materials. Background technique [0002] The micro-laminated composite material is made by adding layers of tough material between hard material layers and overlapping them alternately, and using tough metal as the toughening layer. This kind of micro-laminated composite material, which is formed by alternating overlapping of hard and tough materials by vacuum pressing, has attracted the attention of developed countries such as Europe, America, and Russia as soon as it appeared. However, the weldability of this new structural material is fundamentally different from that of clad sheets or conventional laminates. The main difficulties in achieving welding of micro-laminated composites are: [0003] 1) The mutual solubility of tita...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/173B23K9/235B23K9/23B23K103/18
Inventor 李亚江王娟魏守征
Owner SHANDONG UNIV