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Welding gas mixture without oxygen combustion supporting

A gas mixture, welding gas technology, applied in gas flame welding equipment, gas fuel, welding equipment and other directions, can solve the problems of flame temperature drop, scarce output, low safety of acetylene, etc., achieve uniform heat release, reduce production costs, The effect of a wide range of raw materials

Inactive Publication Date: 2021-01-08
NINGBO DUNCOTEK NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acetylene, also known as calcium carbide gas, is a widely used industrial gas. It is a colorless and highly flammable gas at room temperature. Its flame temperature can reach 3160°C (burning in oxygen). It is mainly used for industrial purposes, especially In terms of welding metal, it is currently the main gas source in the field of metal cutting and welding. However, acetylene has low safety, high energy consumption in production, and serious pollution. The production of one ton of calcium carbide consumes 3500-3800 degrees of electricity and 1.5 tons of coke. Every ton of acetylene gas produced produces 3.5 tons of pollution slag and 16 tons of sewage, which has become a source of industrial pollution
Secondly, when using acetylene gas for welding, you must carry pure oxygen as a combustion aid, especially when working at heights, it is very inconvenient
[0003] A few days ago, the domestic alternatives to acetylene are mainly propylene, propane or a mixture of the two. However, the gas based on propylene and propane still cannot reach the combustion temperature of acetylene gas. In order to obtain a higher flame temperature, it is necessary to increase the oxygen ratio, consumes more oxygen
When used in an oxygen-deficient environment such as a plateau, due to insufficient oxygen supply, the flame temperature of the welding gas will be insufficiently combusted, and the flame temperature will drop, which will easily cause insufficient welding. Therefore, a welding gas that can replace the welding gas for propylene copper pipes has been developed. It can save cost, improve welding effect, and it is necessary for normal use in plateau and other hypoxic environments
[0004] Secondly, the installation of central air-conditioning belongs to high-altitude operations, and copper pipe welding is often used. Recently, oxyacetylene or oxygen liquefied petroleum gas is still used as welding gas. It is very inconvenient and unsafe to carry heavy gas and oxygen cylinders to high altitudes.
[0005] In addition, the commonly used MAPP gas abroad has begun to be used in industrial metal welding and cutting, especially the welding of copper pipes. Its composition is a mixture of propyne, propadiene and part of liquefied gas, and the first two components are very rare in my country. Yes, it is not realistic enough to be used in industrial production in the laboratory, so it is necessary to find a new gas mixture with wide sources and low cost to replace the MAPP gas with diacetylene and propadiene as the main components

Method used

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  • Welding gas mixture without oxygen combustion supporting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The liquefied gas that replaces MAPP is obtained by mixing and preparing two liquefied gases of propylene and dimethyl ether at a mass ratio of 9:1. In the case of no need for pure oxygen combustion, its actual combustion temperature can reach 1396°C, and the continuous combustion time is 150 minutes. Using it for 1 hour will not cause the barrel of the welding torch to heat up, and the welding effect is good.

[0027] Combustion performance test and tools:

[0028] 1) Thermometer accuracy: ±1°C.

[0029] 2) High-precision thermometer: 0.1°C (below 1000°C). 1°C (above 1000°C). Conditions of use: 0~50℃

[0030] Cold junction temperature: automatic compensation.

[0031] 3) Pressure gauge: accuracy 5psi, measuring range: (0~500psi)

[0032] 4) Electronic balance precision: 0.1g.

[0033] 5) Stopwatch, welding torch, ignition equipment.

[0034] 6) Weigh the empty bottle, take its weight after filling it with liquefied gas that replaces MAPP, and record relevant dat...

Embodiment 2

[0036] It is prepared by mixing two liquefied gases of propylene and dimethyl ether at a mass ratio of 8:2 to obtain a liquefied gas that can replace MAPP. In the case of no need for pure oxygen combustion, its actual combustion temperature can reach 1382°C, and the continuous combustion time is 160 minutes. Using it for 1 hour will not cause the gun barrel of the welding torch to heat up, and the welding effect is good.

Embodiment 3

[0038] It is prepared by mixing two liquefied gases of propylene and dimethyl ether at a mass ratio of 7:3 to obtain a liquefied gas that can replace MAPP. Without pure oxygen for combustion, its actual combustion temperature can reach 1362°C, and the continuous combustion time is 175 minutes. Using it for 1 hour will not cause the barrel of the welding torch to heat up, and the welding effect is good.

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Abstract

The invention relates to a welding gas mixture without oxygen combustion supporting. The welding gas mixture provided by the invention is composed of the following gases in percentage by mass: 30%-90%of propylene and 10%-70% of dimethyl ether, and has the advantages of low cost, readily available materials, safety in use, capability of welding and cutting metal under the condition that oxygen combustion supporting is not needed, and convenience in use.

Description

technical field [0001] The invention relates to an industrial combustion gas, which is especially suitable for welding and cutting copper pipes. Background technique [0002] In the process of industrial metal welding and cutting, acetylene gas is generally used for welding and cutting. Acetylene, also known as calcium carbide gas, is a widely used industrial gas. It is a colorless and highly flammable gas at room temperature. Its flame temperature can reach 3160°C (burning in oxygen). It is mainly used for industrial purposes, especially In terms of welding metal, it is currently the main gas source in the field of metal cutting and welding. However, acetylene has low safety, high energy consumption in production, and serious pollution. The production of one ton of calcium carbide consumes 3500-3800 degrees of electricity and 1.5 tons of coke. Every ton of acetylene gas produced produces 3.5 tons of pollution slag and 16 tons of sewage, which has become a source of industr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/00B23K5/00B23K7/00
CPCB23K5/00B23K7/00C10L3/00
Inventor 林宇峰
Owner NINGBO DUNCOTEK NEW MATERIAL CO LTD
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