Gas protection device and process method for TC4 titanium alloy plate welding

Abstract

The invention relates to a gas protection device for TC4 titanium alloy plate welding. The gas protection device comprises a base (1), a gas connecting pipe (5) and a gas inflation chamber (4), wherein the inflation chamber (4) is connected to a gas cylinder of welding equipment through a gas connecting pipe (5), the inflation chamber (4) is an arc-shaped cylinder with two closed ends, an opening part of the arc-shaped cylinder is connected on the lower surface of the base (1) in a welded mode, a longitudinal welding seam preassembling groove (2) is formed in the center of the upper surface of the base (1), a plurality of needle type gas outlets (3) are correspondingly formed in two side walls of the welding seam preassembling groove (2), the needle type gas outlets (3) communicate with the inflation chamber (4), and during installation, the welding seam preassembling groove (2) is tightly attached to a workpiece welding seam position. According to the gas protection device and process method, the welding defects of TC4 titanium alloy welding joint embrittlement, weld crack tendency, welding bubbles and the like are overcome, the one-time inspection qualification rate of product welding is improved, and the welding efficiency of TC4 titanium alloy plates is improved.

Description

technical field [0001] The invention belongs to the technical field of welding of titanium alloy materials, and in particular relates to a gas protection device and a process method for welding TC4 titanium alloy plates, and is particularly suitable for welding TC4 titanium alloy plates whose weld seam grade is above grade two. Background technique [0002] TC4 titanium alloy is regarded as an "all-round metal" with high specific strength, corrosion resistance, thermal stability and other characteristics. It is one of the preferred materials for high mobility equipment and lightweight manufacturing. However, the welding performance of TC4 titanium alloy is relatively poor, the weld grade is not easy to achieve, and the welding efficiency is relatively low. [0003] TC4 titanium alloy is a metal with very active chemical properties. It has a strong affinity for gases such as hydrogen, oxygen and nitrogen at high temperatures. Especially in the welding process, this ability is...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a welding process for TC4 titanium alloy plates, which can solve welding defects such as brittleness of TC4 titanium alloy welded joints, tendency of weld cracks, welding bubbles, etc., improve the pass rate of product welding once handed over inspection, and improve TC4 titanium alloy plates welding efficiency

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