Joint welding clamp of titanium alloy straight pipe and joint welding method

Abstract

The invention discloses a joint welding clamp of a titanium alloy straight pipe and a joint welding method. The joint welding quality and precision of the titanium alloy straight pipe can be guaranteed by adopting auxiliary supporting and clamping inside the titanium alloy straight pipe and protecting a welding influenced region by inert gas. The method comprises the steps of sealing places where copper sleeves are matched with the titanium alloy straight pipe by sealing tapes at the two ends of a gas feeding pipe, feeding protective gas to a weld joint by two exhaust holes in the feeding pipe, and forming an integral part for supporting a welding region in an auxiliary way by fixedly connecting an arc-shaped copper block, with two exhaust holes, on the gas feeding pipe through super glue; taking out the gas feeding pipe and the arc-shaped copper block from the titanium alloy straight pipe after the completion of welding due to the fact that the radian of the arc-shaped copper block is smaller than a semicircle, performing gas protection on the welding joint outside the titanium alloy straight pipe by a protective cover, fixing a welding gun on the protective cover by a clamp ring, and driving the welding gun to move by moving the protective cover; clamping the titanium alloy straight pipe by adopting an arc-shaped clamp, in order to guarantee the welding continuity..

Description

technical field [0001] The invention belongs to the technical field of mechanical manufacturing and processing technology, and in particular relates to a seam welding fixture and a seam welding method for a titanium alloy straight pipe. Background technique [0002] Titanium alloy has excellent corrosion resistance, and has the characteristics of small specific gravity and high strength. With the continuous development of my country's aviation industry, the use of titanium alloy sheets in aircraft manufacturing is increasing; usually, in the processing of aircraft parts, there are a large number of oil and gas pipeline parts, especially in large aircraft, this oil and gas pipeline The diameter of the road is getting bigger and bigger. Therefore, the manufacture of large-diameter pipelines is generally formed by cold bending of sheets, and then welding the seams of the formed straight pipes to obtain titanium alloy pipe fittings. This method for processing large-diameter pip...

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Problems solved by technology

[0004] In order to overcome the problem of local collapse caused by the welding seam and the near seam area of ​​the prior art being prone to softening due to the long residence time in the high temperature environment and the wave-like warping deformation caused by the increase of welding stress caused by the expansion of the heat-affected zone, The present invention proposes a seam welding jig and seam welding method for titanium alloy straight pipes. Pipe seam welding quality and precision

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