Titanium alloy plate vacuum electron beam welding method and magnetic suspension superconducting low-temperature nitrogen fixation cavity

Abstract

The invention discloses a titanium alloy plate vacuum electron beam welding method and a magnetic suspension superconducting low-temperature nitrogen fixation cavity. The method comprises the steps of degassing, positioned welding, penetration fusion welding, modification welding and the like. The magnetic suspension superconducting low-temperature nitrogen fixation cavity comprises TC4 titanium alloy components formed by using the titanium alloy plate vacuum electron beam welding method. According to the welding method, welding between the TC4 titanium alloy plates is stable, the welding seam width is uniform, undercut and sinking are avoided, splashing is little, and the welding method has the advantages that the number of pores in the welding seam is small, and the tensile strength of the welding seam is higher than that of a base metal; when the TC4 titanium alloy components welded through the welding method are applied to the magnetic suspension superconducting low-temperature nitrogen fixation cavity, the magnetic suspension superconducting low-temperature nitrogen fixation cavity has the advantages of being stable in performance, long in service life and the like due to the above effects.

Description

technical field [0001] The invention relates to a welding method, in particular to a vacuum electron beam welding method for TC4 titanium alloy parts in a maglev superconducting low-temperature nitrogen-fixing chamber. Background technique [0002] The maglev superconducting low-temperature nitrogen-fixing chamber is an important component for high-speed trains to move towards the "super iron" with a speed of 600 kilometers per hour in the future. Japan has begun research, and my country is also stepping up development. In order to ensure the light weight and high low-temperature strength of the maglev superconducting low-temperature nitrogen fixation chamber, the box body and flange need to use titanium alloy materials with high specific strength, and several TC4 titanium alloy plates need to be tailor-welded into the box body during manufacture. [0003] Since the TC4 titanium alloy material has the characteristics of absorbing hydrogen, oxygen, and nitrogen at high weldin...

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Problems solved by technology

However, if the above-mentioned TC4 titanium alloy plate is welded directly by the ordinary vacuum electron beam welding method, there will be defects such as many pores inside the weld, poor surface forming, undercut, concave and serious spatter, resulting in poor sealing of the welded joint and tensile strength. Low strength, cracks are prone to occur at the undercut of the weld, and it is difficult to meet the design requirements

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