Flash welding forming method for titanium alloy special-shaped-section annular piece

Abstract

The invention discloses a flash welding forming method for a titanium alloy special-shaped-section annular piece. The method comprises the following steps that an alloy special-shaped-section annular blank is clamped on a flash butt welding machine, and the distance at an opening of the alloy special-shaped-section annular blank is less than or equal to 8mm, the annular blank is electrified with a current of 160KA, so that the opening of the annular blank flashes and the temperatures of the left end face and the right end face of the opening instantly reach a gasification temperature of 3000 DEG C of alloy, meanwhile, the right end face is fed to the left end face, flashing is stopped after a burning area is formed by burning a distance of 13mm-18mm within 1 minute of flashing, and feeding of the right end face of the annular blank is stopped; and when the temperatures of the left end face and the right end face of the annular blank are reduced from 3000 DEG C to 1000 DEG C, a high-temperature area is formed, the distance between the left end face and the right end face of the annular blank is 10 mm-12 mm, upsetting welding is carried out in the high-temperature area to form the special-shaped-section annular piece, then the temperature of a welding seam is kept being reduced to 960 DEG C under the action of upsetting force, and the technological process is completed, wherein the period of the welding seam temperature from 1000 DEG C to 960 DEG C is called a heat affected zone. The method is mainly used for welding the titanium alloy special-shaped-section annular piece.

Description

technical field [0001] The invention relates to a welding method, in particular to a flash welding forming method of a titanium alloy special-shaped section ring piece. Background technique [0002] The Chinese invention patent specification CN104526142A published on April 22, 2015 discloses a flash welding forming method of a large cross-section ring of α-β two-phase titanium alloy. The steps are as follows: first, the α-β two-phase titanium alloy with opening The large cross-section ring blank is fixed on the fixture, and the power is turned on to make the current flow from the left end to the right end through the back to form a circulating current for preheating; then drive the right end to approach the left end for weak flashing; then increase the feed speed and adjust the current for strong flashing. flashing to form a temperature field; then according to the temperature field, calculate the length of the high-temperature mushy zone and the high-temperature microstruct...

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Problems solved by technology

[0003] When using the above method to weld titanium alloy special-shaped cross-section ring parts, since the longitudinal section of the special-shaped cross-section ring part is a non-rectangular irregular shape, its cross-sectional area is smaller than that of the rectangular cross-section or large cross-section ring parts of the same specification. When the surface dissipates heat quickly, it is difficult to form a stable temperature field, thereby affecting the welding quality and causing defects such as virtual welding

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