Method for preparing bottled multi-element mixed gas

A mixed gas and multi-component technology, which is applied to equipment loaded into pressure vessels, container filling methods, mechanical equipment, etc., can solve problems such as increased burning loss of welding torch tungsten electrodes, easy generation of pores, slag inclusions, and influence on molten metal protection, etc. , to achieve the effect of fast welding speed, strong anti-porosity ability and excellent welding performance

Active Publication Date: 2014-02-19
HUNAN TIEDA ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Traditional welding protective gas usually uses argon or a mixture of helium and argon, but the content of impurities in argon easily exceeds the specified standard, which not only affects the protection of molten metal, but also easily produces defects such as pores and slag inclusions. The quality of the welded joint deteriorates and increases the burning loss of the tungsten electrode of the welding torch, which cannot meet the high-quality requirements. The mixed gas of helium and argon does not corrode the steel cylinder, and the welding quality is better than that of argon, but the above defects still exist

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Connect qualified gas cylinders (steel cylinders) to the interface of the busbar, and vacuum the gas cylinders and filling pipeline system so that the oxygen volume content in the gas cylinders and filling pipeline systems is 3×10 -6 , the water volume content is 3×10 -6 , fill the argon gas into the above-mentioned gas cylinder that has been evacuated as the bottom gas, control the pressure in the cylinder to 0.1Mpa, connect the storage tank containing the mixed gas of argon and nitrogen to the gas cylinder through the bus bar, and supply multiple gas The bottle is filled with argon and nitrogen mixed gas, and the pressure in the bottle is controlled to be 0.2 MPa; the helium is filled into the gas bottle containing argon and nitrogen through the confluence, and the pressure in the bottle is controlled to be 3.3 MPa. At this time, the temperature of the bottle wall is 37°C, when the temperature drops to room temperature, fill the argon again (through the manifold) in...

example 2

[0026] After vacuuming, the oxygen volume content in the gas cylinder and filling pipeline system is 2.5×10 -6 , the water volume content is 2.5×10 -6 , the temperature of the bottle wall after helium is filled into the cylinder is 35°C, and the pressure in the final helium, nitrogen and argon multi-component mixed gas cylinder is controlled to be 10.1Mpa, and the rest are the same as in Example 1.

Embodiment 3

[0028] After vacuuming, the oxygen volume content in the gas cylinder and filling pipeline system is 2.0×10 -6 , the water volume content is 2.0×10 -6 , the temperature of the bottle wall after helium is filled into the cylinder is 33° C., and the pressure control in the final helium, nitrogen and argon multi-component mixed gas cylinder is 9.9Mpa, and all the other are the same as Example 1.

[0029] Helium, nitrogen, and argon are all high-purity gases, which meet the standards of GB / T 7445-1995, GB / T 8979-2008, and GB / G 4842-2006 respectively.

[0030] The volume content of argon (Ar), nitrogen (N2), helium (He), oxygen (O2), and water (H2O) can also be expressed as content (volume fraction), and the unit of measurement can be cubic meters or liters. The volume content of nitrogen, oxygen and water in the above-mentioned control indicators is on the order of 10-6 or less than this order of magnitude, so they are negligible in the total volume content.

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PUM

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Abstract

The invention discloses a method for preparing bottled multi-element mixed gas. The method is characterized by comprising the following steps of: (A) connecting a qualified gas bottle to a port of a filling busbar; (B) vacuumizing the gas bottle and a filling pipeline system, and controlling the volume content of oxygen in the gas bottle and the filling pipeline system to be less than and equal to 3*10<-6> and the volume content of water to be less than and equal to 3*10<-6>; (C) filling argon into vacuumized gas bottle to serve as base gas, and controlling pressure in the gas bottle to be 0.1 MPa; (D) filling gas in an argon and nitrogen mixed gas container into the gas bottle in the step (C), and controlling pressure in the bottle to be 0.2 MPa; (E) filling helium into the gas container in the step (D), and controlling pressure in the bottle to be 3.3 MPa; and (F) when the wall of the bottle is cooled to room temperature, filling the argon into the gas bottle in the step (E), and controlling pressure in the bottle to be 9.9 to 10.1 MPa to obtain the helium, nitrogen and argon bottled multi-element mixed gas. The method is mainly applied to protective gas for welding core aluminum alloy parts of high-speed railways.

Description

technical field [0001] The invention relates to a method for preparing a mixed gas, in particular to a method for preparing a bottled multi-component mixed gas. Background technique [0002] Traditional welding protective gas usually uses argon or a mixture of helium and argon, but the content of impurities in argon easily exceeds the specified standard, which not only affects the protection of molten metal, but also easily produces defects such as pores and slag inclusions, making The quality of the welding joint deteriorates and increases the burning loss of the tungsten electrode of the welding torch, which cannot meet the high-quality requirements. The mixed gas of helium and argon has no corrosion on the steel cylinder, and the welding quality is better than that of argon, but the above defects still exist. Contents of the invention [0003] The object of the present invention is to provide a method for preparing bottled multi-component mixed gas, so as to overcome th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17C5/00
CPCY02E60/321Y02E60/32
Inventor 胡声辉黄建宇李映龙凌新
Owner HUNAN TIEDA ENERGY TECH
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