A kind of laser welding method of stainless steel-titanium alloy dissimilar metals

Abstract

The invention discloses a stainless steel-titanium alloy different metal laser welding method. The method takes laser as a welding heat source and niobium is added between stainless steel and a titanium alloy as an intermediate layer. By accurately controlling welding process parameters, a compound connector (titanium-niobium melting connection and niobium-iron liquid-phase dispersion connection) with two connection states is formed under a one-step heating condition, so that high-quality and high-efficiency welding of a stainless steel-titanium alloy different metal material is realized. By controlling the thickness of the intermediate layer and a welding speed of laser welding, metal niobium, which is not melted and has a certain thickness, exists between a titanium-niobium melting-welding welding seam and a niobium-iron liquid-phase dispersion-welding welding seam, and titanium and iron elements are prevented from mutual dispersion to form a crispy iron-titanium intermetallic compound. Finally, a formed welding seam has a beautiful shape, welding technological properties are good and the tensile strength is relatively strong.

Description

technical field [0001] The invention relates to a material welding (connecting) technology, in particular to a laser welding method of stainless steel-titanium alloy dissimilar metals. Background technique [0002] Titanium and titanium alloys are widely used in aerospace, medical, metallurgy, weaponry and other manufacturing fields due to their high specific strength, corrosion resistance and good processability. However, its high price limits the large-scale application of titanium and titanium alloys as structural parts. Therefore, titanium alloys and other metal materials, especially composite components of titanium alloys and stainless steel, have become an important development direction for welded parts in the fields of medical equipment and weaponry. Due to the significant difference in physical and chemical properties between iron and titanium, a large number of brittle Fe-Ti intermetallic compounds are easily produced in the welded joint and there is a large resid...

AI Technical Summary

Problems solved by technology

At present, gold-based or silver-based solders are mostly used, resulting in high welding costs, and the generation of Fe-Ti intermetallic compounds cannot be avoided, resulting in unsatisfactory joint connection performance.

In short, the above methods are complicated in process, long in welding time, extremely low in production efficiency, poor in flexibility, and are limited by factors such as joint form, workpiece size and shape, and have great limitations in the application in mass industrial production.

Therefore, traditional diffusion welding and brazing methods can no longer meet the current requirements for stainless steel-titanium alloy welding quality and production efficiency to a certain extent.

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