Ti-A1-V-Y filling layer for titanium alloy welding and welding method of Ti-A1-V-Y filling layer

Abstract

A Ti-A1-V-Y filling layer for titanium alloy welding is used for laser welding of a U-shaped groove formed in a Ti6Al4V titanium alloy plate butt joint, and the opening width of the U-shaped groove ranges from 0.8 mm to 1.2 mm. The filling layer is composed of the following metal elements in percentage by mass: 6% of aluminum, 4% of vanadium, 0.1-0.7% of yttrium and the balance of titanium; a preparation method of the filling layer comprises the following steps that S1, titanium particles, aluminum particles, vanadium particles and yttrium particles are weighed; s2, putting the metal particles into a vacuum induction furnace, and repeatedly overturning and smelting under protective gas to obtain alloy liquid; s3, the alloy liquid is subjected to heat preservation treatment in a vacuum induction furnace; s4, casting the alloy liquid to obtain an alloy ingot; and S5, the alloy ingot is prepared into a filling layer matched with the U-shaped groove. In a word, the novel Ti6Al4V filling layer added with the Y element is selected for welding the titanium alloy, and the welding seam with good quality is obtained by designing the shape and size of the groove and optimizing parameters such as laser power and welding speed.

Description

technical field [0001] The invention relates to a Ti-A1-V-Y filling layer for titanium alloy welding and a welding method thereof, belonging to the technical field of titanium alloy welding. Background technique [0002] Titanium alloy has the advantages of high specific strength, low density, good corrosion resistance, and excellent high temperature performance. It is one of the important structural materials and is currently widely used in aerospace, petrochemical, automotive, medical, food and other industries. Ti6Al4V titanium alloy is widely used in marine drilling, pressure vessels, deep submersibles, Nuclear submarines, aerospace ships and weapons and equipment and other fields. As early as the 1980s, the U.S. coastal defense construction army had already begun to use titanium alloy materials to manufacture ocean-going transport ships, which greatly improved its service life and stability, and reduced maintenance costs. In recent years, the proportion of titanium al...

AI Technical Summary

Problems solved by technology

During welding, the strength of the welding part is very important. In the current laser welding process, the optimization of process parameters is mainly used to improve the welding strength, but the above-mentioned method has a limited degree of strength improvement. A lot of time and money, not suitable for the needs of modern industrial development

[0004] Laser welding with filler material has the advantages of narrow welding heat-affected zone and concentrated welding energy. At the same time, due to the metallurgical effect of filler metal, it can connect and supplement the metallurgical burning loss of beneficial elements. , improving the comprehensive performance plays an important role. Based on the characteristics and advantages of the filler layer plus laser welding, the existing laser filler wire welding cannot meet the requirements of the existing welding process method, and the existing welding wire cannot fully meet its use requirements, so It is very important to develop a filler material with high welding efficiency, good molten pool flow spreadability, less spatter during welding, no oxides on the weld surface, suitable for laser and its welding method to improve the application range of titanium alloy

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