Titanium alloy welding system with CO2 as environmental atmosphere and welding method

Abstract

The invention belongs to the technical field of welding, and discloses a titanium alloy welding system with CO2 as an environmental atmosphere and a welding method. The welding system comprises an environment chamber with a top window, wherein the environment chamber is connected with a CO2 inlet pipeline in a sealed mode, the internal space of the environment chamber is divided into an upper half portion and a lower half portion by a partition plate with holes, a dry ice layer is spread at the lower half portion, and the upper half portion is provided with a welding workbench. According to the welding method, before welding, the CO2 is introduced through the CO2 inlet pipeline to replace air in the environment chamber, and the dry ice layer continuously provides the CO2 for the interior of the environment chamber in a welding process. According to the titanium alloy welding system with the CO2 as the environmental atmosphere and the welding method, the characteristics that CO2 gas is large in density, large in specific heat capacity, poor in air oxidability and the like are fully utilized, and titanium alloy efficient consumable electrode arc welding is conducted in a semi-open environment full of the CO2 gas; equipment can be simplified, the protection cost is reduced, and the safety of the welding process is improved; and the space flexibility of a welding protection form is improved, and space welding seam protection of complex structural parts is achieved.

Description

technical field [0001] The invention belongs to the technical field of welding, and in particular relates to a welding system and a welding method suitable for titanium alloys. Background technique [0002] Titanium and titanium alloys have strong high-temperature activity. They start to absorb hydrogen at 250°C, oxygen at 400°C, and nitrogen at 600°C. When the protective measures are not in place during the welding process, the weld seam will absorb these harmful gases and cause the performance of the joint to deteriorate. Among them, the impact of oxygen is the most serious, which will cause serious oxidation of high-temperature weld metal, so appropriate protective measures must be taken for the welding area above 400 °C to avoid its contact with air. [0003] At present, the technology commonly used in engineering is to keep the high-temperature weld in an inert gas atmosphere. This protection method is divided into two types: the overall protection method and the parti...

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Problems solved by technology

[0006] The invention focuses on solving the technical problem that the weld metal will be severely oxidized by oxygen in the air due to the slow cooling speed of the weld metal and the long residence time at high temperature in the welding process of titanium alloy, thereby affecting the quality of the weld seam. 2 Titanium alloy welding system and welding method as the ambient atmosphere, making full use of CO 2 The gas has the characteristics of high density, large specific heat capacity, and weaker oxidation than air, so it can be realized in a CO 2 High-efficiency metal arc welding of titanium alloys is carried out in a semi-open environment of gas; compared with the overall protection method, it can simplify the equipment and reduce the protection cost, and improve the safety of the welding process; compared with the partial protection method, it can increase the space of its protection form Flexibility to realize space weld protection of complex structural parts

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