Laser welding method for thin-walled tantalum tube and thin-walled iron-nickel alloy pipe

Abstract

The invention provides a laser welding method for a thin-walled tantalum tube and a thin-walled iron-nickel alloy pipe. The laser welding method comprises the following steps of: 1, microscopically, removing burrs of the thin-walled tantalum tube and the thin-walled iron-nickel alloy pipe, and after grinding and polishing, carrying out ultrasonic washing; 2, assembling before welding to obtain an assembly part; 3, placing the assembly part in a welding chamber of laser equipment, aligning a laser generator with a welding hole to enable a laser beam emitted by the laser generator to be irradiated to to-be-welded positions of the thin-walled tantalum tube and the thin-walled iron-nickel alloy pipe, installing a chuck on a lathe, then closing the welding chamber, filling inert protection gas by a gas inlet pipe, rotating a rotating shaft by the lathe, and simultaneously emitting the laser beam to obtain a welded structure of the thin-walled tantalum tube and the thin-walled iron-nickel alloy pipe. The laser welding method can overcome the deficiencies and the defects of part deformation, burning loss of an iron-nickel alloy part, runoff and evaporation in the process of welding tantalum and iron-nickle alloy thin-walled parts in the prior art, and is particularly suitable for high-strength connection of the tantalum and iron-nickle alloy thin-walled parts.

Description

technical field [0001] The invention belongs to the technical field of metal pipe welding, and in particular relates to a laser welding method for a thin-walled tantalum pipe and a thin-walled iron-nickel alloy pipe. Background technique [0002] Tantalum has high density, high melting point, excellent corrosion resistance, high strength, excellent processing performance, good plasticity and ductility, and is an important strategic material. important functional materials. [0003] Iron-nickel alloy is a ceramic sealing alloy developed in combination with the characteristics of ceramics in my country. It has the same properties as 95% Al in the temperature range of -60°C to +600°C. 2 o 3 The coefficient of linear expansion is similar to that of ceramics. It is mainly used for matching and sealing with ceramics, and is an important sealing structure material in the electric vacuum industry. In order to give full play to the sealing effect of iron-nickel alloy and the adva...

AI Technical Summary

Problems solved by technology

[0004] The melting point of tantalum and iron-nickel alloy is very different, and it is easy to cause burning loss, loss, and evaporation of low-melting iron-nickel alloy during welding, and because the parts are thin-walled parts, deformation is easy to occur during welding

In addition, tantalum and iron will form some brittle intermetallic compounds at high temperature, which will greatly reduce the welding quality, and even lead to weld cracking and failure in severe cases

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