Aluminothermy welding method of aluminium alloy

Abstract

The invention relates to a thermit welding method of aluminium alloy, which comprises the following steps: preparing a thermit welding agent; placing the thermit welding agent in a crucible; embeddinga TiC igniter into the thermit welding agent; exposing a part; igniting the exposed part; igniting the thermit welding agent in the crucible for thermit reaction; placing the solid aluminium alloy into the surface of reactants in the crucible immediately after the reaction is finished; using the residual heat to melt the solid aluminium alloy and obtaining the liquid aluminium alloy melt; preheating fractures of the aluminium alloy parts to be welded to the temperature of 390-410 DEG C when the former step is carried out; directly casting the aluminium alloy melt to the position of the fracture of the processed aluminium alloy parts; carrying out the densification processing by striking and extruding the welding seam when the metal to be seamed is just solidified and realizing the welding; and clearing weld flash by hands when the temperature is high. The thermit welding method of the invention is applicable to emergent and fast welding and repairing of aluminium alloy armor plates and aluminium alloy parts of armored equipment in battlefields and is also applicable to emergent welding and repairing of aluminium alloy parts of civilian vehicles or other machines in field working.

Description

technical field [0001] The invention relates to an aluminum alloy self-propagating fast welding method, which is mainly suitable for emergency welding repair of armored equipment aluminum alloy decks and parts battlefields. It belongs to the technical field of aluminothermic welding. Background technique: [0002] Due to the advantages of light weight, high strength and corrosion resistance of aluminum alloy, the armor plates and most parts of airdrop armor equipment and amphibious armor equipment are made of aluminum alloy. The emergency repair of aluminum alloy parts of armored equipment on the battlefield is an effective means to maintain the survival rate of armored equipment on the battlefield and improve the regeneration ability of combat effectiveness. Welding repair of aluminum alloy parts with mild war damage on the battlefield is a very important repair method. There are many traditional aluminum alloy welding techniques, but there are three problems as follows: ...

AI Technical Summary

Problems solved by technology

There are many traditional aluminum alloy welding techniques, but there are three problems as follows: First, the electrode and the substrate are not the same material, and the thermal expansion and contraction properties between the weld and the substrate are not completely the same. Stress is generated, which affects the strength of the weld; second, welding equipment and electrical energy are needed, and armored equipment under field conditions not only does not carry on-board electric welding equipment, but also has no power supply and gas storage cylinders. The need for emergency repair; third, the weld metal is mostly free crystallization, and the weld structure and density are not very high

There is an urgent need for a technology suitable for rapid welding of aluminum alloy parts without electricity, gas and simple equipment, so as to solve the emergency welding and repair problems of armored equipment aluminum alloy armor plates and aluminum alloy parts under field conditions

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