Machining method for improving ultrasonic flaw detection qualification rate of titanium alloy super-long seamless pipe

Abstract

The invention discloses a processing method for improving the ultrasonic flaw detection qualification rate of a titanium alloy super-long seamless pipe, a pipe blank pre-preparation process is carried out before cogging rolling in a titanium alloy pipe preparation process, and the pipe blank pre-preparation process comprises pipe blank pre-rolling, inner surface boring and outer surface turning. The pipe blank pre-preparation process is carried out before cogging rolling in an existing titanium alloy pipe preparation process, so that the inner and outer diameter deviation of the pipe blank is effectively reduced, the defects of the inner and outer surfaces of the pipe blank are eliminated or reduced, the pipe blank meeting the process requirements is obtained, generation and expansion of cracks on the inner and outer surfaces of the pipe in the subsequent machining process are greatly reduced, and the production efficiency is improved. Therefore, the ultrasonic flaw detection qualification rate of the titanium alloy super-long seamless pipe is increased, the obtained product is high in precision and good in stability, the product quality is met and stabilized, meanwhile, the machining efficiency is improved, and the ultrasonic flaw detection device is convenient to popularize and use.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy seamless pipe processing, and in particular relates to a processing method for improving the pass rate of ultrasonic flaw detection of titanium alloy ultra-long seamless pipe. Background technique [0002] Metal titanium is known as the metal of the 21st century. It is a kind of rare metal. Its main characteristics are low density, light weight, high strength and corrosion resistance. It is widely used in heat exchangers of large chemical projects and many other aspects. As the production capacity of chemical projects increases, the volume of the supporting titanium heat exchangers is getting larger and larger, and the length of the seamless pipes used is getting longer and longer. Around 2005, the length of a single pipe used in heat exchangers was basically concentrated at about 6000mm. Since 2010, the length of a single pipe has exceeded 10000mm, or even longer. As the length of a singl...

AI Technical Summary

Problems solved by technology

Under this process, the qualified rate of ultrasonic flaw detection of titanium pipes can reach about 70%, that is to say, at least 30% of the pipes are unqualified, resulting in waste of raw materials, resulting in high production costs and material costs

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