Gas shield device for argon arc welding of titanium material

Abstract

The invention discloses a gas shield device for argon arc welding of a titanium material. The gas shield device comprises a nozzle, a ceramic nozzle and a contact tube, wherein the nozzle is sleeved with the ceramic nozzle through a thread, one end of the contact tube is fixed in the nozzle, the nozzle is internally provided with eight distribution holes with the contact tube as a center, the distribution holes are arranged into a ring, the end of the nozzle is provided with a protection cover structure internally provided with a cavity, the end of the nozzle is further provided with two 200-mesh stainless steel screens, and the other end of the contact tube extends out of the nozzle. The gas shield device effectively achieves air isolation, gas dispersion is more uniform, airflow is more stable, a better protection effect is achieved, and the welding effect is good.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a gas shielding device for argon arc welding of titanium materials. Background technique [0002] Titanium has strong chemical activity. When titanium is placed in the air, a dense oxide film can be formed rapidly on its surface. Oxygen reacts violently to form titanium oxides. At higher temperatures, titanium will absorb gaseous elements such as hydrogen and nitrogen in the air, which will eventually reduce the plasticity of titanium and sharply reduce its impact toughness. During the welding process, when molten titanium is exposed to the air, elements such as oxygen, hydrogen, and nitrogen in the air will quickly combine with titanium to form brittle oxides or nitrides, which will sharply reduce the plasticity of the weld metal and improve the impact toughness. When it falls, brittle fracture will occur in severe cases. Therefore, a gas protection device must be used when we...

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Problems solved by technology

[0003] However, the weld seam welded by the existing gas protection device is often blue and gray in color, which is actually the result of severe oxidation. The main reason is that the diameters of the nozzle and the porcelain nozzle are small, and the effective coverage is about 20mm. As the welding process advances, when the molten pool has not cooled down, the gas shield has left the molten pool, causing the molten metal to be directly exposed to the air and undergo oxidation reactions; secondly, when the gas enters the nozzle for diversion and then reaches the weld area, the gas is not dispersed. Even, and the air flow is unstable, it will also have a bad effect on the protection of the molten pool

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