Argon shielding device for titanium material welding and usage method of device

Abstract

The invention discloses an argon shielding device for titanium material welding, belongs to the field of welding in the machinery industry, and solves technical problems of hydrogen absorption, oxygen absorption and the like of weld joint molten pools during titanium material welding. The device comprises two parts, namely, an upper gas shielding cover and a lower gas shielding tank, wherein the upper gas shielding cover structure comprises a welding torch 1, a hose clamp 2, a tail drag cover 3, a vent pipe 4 and a porous plate 5; the argon arc welding torch can be tightly clamped by the hose clamp 2, the tail drag cover 3 is connected with the hose clamp, and a plurality of small holes are formed in the bottom of the vent pipe 4; the lower gas shielding tank structure comprises a grooved steel plate 6, a porous plate 7 and a gas inlet pipe 8. A usage method of the device comprises steps as follows: a piece of weldment is placed between the upper gas shielding cover and the lower gas shielding tank, argon is fed from upper and lower sides respectively, the argon arc welding torch is fixed according to an operation procedure, the distance between the welding torch and the workpiece is adjusted, and welding is performed after air in the shielding tank is replaced. With the adoption of the device and the method, argon flows stably, the welding joint surface shielding effect is very good, the structure is simple, the cost is low, the manufacturing cost is greatly saved, and production efficiency and quality are improved.

Description

Technical field [0001] The invention belongs to the field of welding processing in the mechanical industry. Background technique [0002] As an active metal, titanium absorbs a large amount of hydrogen when the temperature is above 300°C, and absorbs oxygen above 400°C, resulting in a decrease in material performance and an increase in the difficulty of welding, which requires the temperature to be above 300°C during the welding process. The welding heat-affected zone and weld seam are protected. At present, argon arc welding under inert gas or vacuum conditions is mostly used. Even if the welding fully meets the process parameters, sometimes the titanium weld will appear golden yellow-purple transition light yellow color or even pores. Because the effect of gas protection can be judged from the color of the surface of the titanium weld, this color of the weld indicates that the argon protection effect is not good, the weld is oxidized at high temperature, and the perform...

AI Technical Summary

Problems solved by technology

[0003] The problem we want to solve is: to overcome the welding defects such as hydrogen embrittlement, porosity and tungsten inclusions in the weld seam caused by poor gas protection in the argon arc welding process of titanium materials, which affect the quality of the weld seam

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