CN112195050A - Welding gas mixture without oxygen combustion supporting - Google Patents
Welding gas mixture without oxygen combustion supporting Download PDFInfo
- Publication number
- CN112195050A CN112195050A CN202010902158.3A CN202010902158A CN112195050A CN 112195050 A CN112195050 A CN 112195050A CN 202010902158 A CN202010902158 A CN 202010902158A CN 112195050 A CN112195050 A CN 112195050A
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- welding
- gas
- oxygen
- gas mixture
- combustion
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K5/00—Gas flame welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Arc Welding In General (AREA)
- Feeding And Controlling Fuel (AREA)
Abstract
The invention relates to a welding gas mixture without oxygen combustion supporting. The welding gas mixture provided by the invention consists of the following gases: the weight percentage content of the propylene is 38-52%, the weight percentage content of the propane is 35-53%, the weight percentage content of the dimethyl ether is 9-25%, the cost is low, the materials are easy to obtain, the use is safe, metal can be welded under the condition that oxygen is not needed for combustion supporting, and the use is very convenient.
Description
Technical Field
The present invention relates to an industrial combustion gas, in particular, it is applicable to welding and cutting copper pipe.
Background
In the industrial metal welding and cutting process, acetylene gas is generally used for welding and cutting. Acetylene is also called acetylene, is a widely used industrial gas, is a colorless and extremely flammable gas at room temperature, has flame temperature of 3160 ℃ (combustion in oxygen), is mainly used as a main gas source in the field of metal cutting and welding at present in particular in the aspect of welding metal, however, acetylene has low safety, high energy consumption in production and serious pollution, 3500 and 3800 DEG electrical consumption and 1.5 tons coke of electrical consumption of one ton of calcium carbide are produced, and 3.5 tons of pollution slag and 16 tons of sewage are produced for each ton of acetylene gas, which become industrial pollution sources. Secondly, when acetylene gas is used for welding, pure oxygen must be carried as a combustion improver, and the welding is very inconvenient particularly when working aloft.
At present, the products for replacing acetylene in China are mainly propylene, propane or a mixed gas of propylene and propane, but the fuel gas taking propylene and propane as base materials still cannot reach the combustion temperature of acetylene gas, so that the proportion of oxygen needs to be increased and more oxygen is consumed in order to obtain higher flame temperature. When the welding gas is used in oxygen-deficient environments such as plateaus, the insufficient combustion flame temperature of the welding gas is reduced due to insufficient oxygen supply, and the condition of insufficient welding is easily caused, so that the development of the welding gas capable of replacing the welding gas of the propylene copper pipe can save the cost and improve the welding effect, and the welding gas is necessary to be normally used in the oxygen-deficient environments such as plateaus.
Secondly, the installation of the central air conditioner belongs to high-altitude operation, copper pipes are often used for welding, oxyacetylene or oxygen liquefied petroleum gas is still used as welding gas in the day, and heavy fuel gas and oxygen steel cylinders are inconvenient and unsafe to carry to high altitude.
In addition, MAPP gas commonly used in foreign countries is already used for welding and cutting industrial metals, especially for welding copper pipes, and the MAPP gas comprises a mixture of propyne and allene plus part of liquefied gas, wherein the former two components are very rare in yield in China, and are not practical only in laboratory industrial production, so that a novel gas mixture with wide sources and low cost needs to be found to replace MAPP gas taking diacetylene and allene as main components.
Disclosure of Invention
The invention aims to provide a gas mixture which is high in safety, stable in flame temperature, low in cost and suitable for various brazing occasions and replaces acetylene gas and MAPP gas. The gas mixture should have the characteristics of stable performance, high combustion heat ratio, high combustion temperature, safe use and convenient carrying, and is also beneficial to environmental protection.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows:
the welding gas mixture without oxygen combustion supporting is a mixture formed by mixing propylene, propane and dimethyl ether according to a certain proportion, wherein the mass percentage of the propylene is 38-52%, the mass percentage of the propane is 35-53%, and the mass percentage of the dimethyl ether is 9-25%.
The welding gas mixture without oxygen combustion supporting is a mixture formed by mixing propylene, propane and dimethyl ether according to a certain proportion, wherein the mass percentage of the propylene is 41-50%, the mass percentage of the propane is 36-49%, and the mass percentage of the dimethyl ether is 10-16%.
The welding gas mixture without oxygen combustion supporting is a mixture formed by mixing propylene, propane and dimethyl ether according to a certain proportion, wherein the mass percentage of the propylene is 43-46%, the mass percentage of the propane is 43-45%, and the mass percentage of the dimethyl ether is 10.5-12.5%.
The gas mixture of the invention is allowed to contain trace gas impurities, the purity of propylene is more than or equal to 99.8 percent, the purity of dimethyl ether is more than or equal to 99.8 percent, and the effective component of the sum of propylene and dimethyl ether accounts for more than or equal to 99.8 percent of the total component.
The two raw materials are products produced in various places of China, propylene and propane are byproducts of petrochemical industry (chemical byproduct level), and the raw materials are wide and stable in source and low in price. The gas mixture principle is that the oxygen atom in the molecular structure of monomethyl ether can increase the supply of oxygen atom in the combustion process and promote the increase of the combustion temperature by utilizing the characteristic that the combustion temperature of propylene is close to that of propyne. The dimethyl ether is an environment-friendly fuel which is vigorously popularized in our country, and has wide sources and low cost. The two pure products can be burnt incompletely, but the two raw materials are mixed in proportion, so that the gas in the container can be fully burnt, the heat is uniformly released, and the production cost is reduced.
By using special welding tools and packaging containers, the actual combustion temperature of the gas mixture can reach more than 1500 ℃ without using pure oxygen for combustion supporting (the actual combustion temperature of common liquefied gas is 600-800 ℃).
The gas mixture has the advantages of higher safety, easy carrying, no black smoke, tempering and other phenomena in the combustion process, overcomes the defects of easy tempering, poor safety, great environmental pollution in the production process and the like of acetylene, and overcomes the defects that the combustion temperature of pure propane is not high enough, and other industrial gases are added with additives such as benzene, hydrogen peroxide and the like, so that the gas mixture has high toxicity and is harmful to the human body of a user. The gas mixture of the invention is more economical, safe and practical. The testing pressure of the gas mixture is 1.2MPa at normal temperature, the temperature of the bottle body can be reduced when the bottle is used for a long time, and the pressure can still reach 0.3MPa even under the condition that the bottle body is in dew. Due to the unique temperature characteristic, the molecular structure of the copper tube can not be damaged due to overhigh temperature in the welding process, and meanwhile, the copper solder can be effectively melted (the melting point is about 950 ℃), so that the solder can be fully melted and flowed.
In summary, other industrial welding and cutting gases must be assisted by oxygen, and the oxygen cylinders are provided during use, which increases the potential risk of use, whereas the gas mixture of the present invention is a brazing process that can be used directly for brazing without the assistance of oxygen.
The invention has the beneficial effects that:
1. propylene, methane and ethane are used as raw materials, all the raw materials are easy to obtain, and the combustion heat and the highest flame temperature are similar to those of acetylene, so that the material can replace fast ethylene or imported copper pipe welding gas with higher cost:
2. the copper pipe welding gas has good combustion performance, can be combusted under the condition of not adopting oxygen for supporting combustion, and has flame temperature reaching 1500 ℃ or higher when oxygen is not used for supporting combustion, so that a heavy oxygen cylinder does not need to be carried during high-altitude operation, the safety performance is high, and the use is convenient.
3. The components used in the copper pipe welding gas of the invention have lower cost and can be purchased directly in the market,
and the mixture can be used after being uniformly mixed by adopting professional mixing equipment.
4. When the copper pipe welding gas is combusted and the copper pipe is welded, the sound is loud and the gas potential is sufficient when the flame is sprayed, and the barrel of the welding gun cannot generate heat after the welding gas is continuously used for 1 hour.
5. The safety performance is high: the fuel gas is insensitive to vibration and has small explosion limit (3-11%); has a narrower explosion range than acetylene gas, and is safer to use
(IV) detailed description of the preferred embodiments
Example 1
The liquefied gas comprises three liquefied gases of propylene, propane and dimethyl ether, wherein the three liquefied gases are respectively 38% by mass: 53%: 9 percent of the raw materials are mixed and prepared to prepare the welding gas mixture without oxygen combustion supporting. Under the condition that pure oxygen is not needed for combustion supporting, the actual combustion temperature can reach 1517 ℃, the continuous combustion time is 150 minutes, the gun barrel of the welding gun cannot be heated after 1 hour of use, and the welding effect is good.
Combustion performance test and tool:
1) the precision of the thermometer is as follows: 1 ℃ C.
2) High precision thermometer 0.1 deg.c (below 1000 deg.c). 1 deg.C (over 1000 deg.C). The use condition is 0-50 DEG C
Cold end temperature: and (6) automatic compensation.
3) A pressure gauge: precision 5psi, measurement range: (0 to 500psi)
4) The precision of the electronic balance is 0.1 g.
5) Stopwatch, welding gun, ignition equipment.
6) Weighing empty bottle, weighing liquefied gas filled instead of MAPP, and recording related data
Example 2
The liquefied gas comprises three liquefied gases of propylene, propane and dimethyl ether, wherein the three liquefied gases are respectively 40% by mass: 46%: 14 percent of the raw materials are mixed and prepared, and the welding gas mixture without oxygen combustion supporting can be prepared. Under the condition that pure oxygen is not needed for combustion supporting, the actual combustion temperature can reach 1524 ℃, the continuous combustion time is 155 minutes, the gun barrel of the welding gun cannot be heated after 1 hour of use, and the welding effect is good.
Example 3
The liquefied gas comprises three liquefied gases, namely propylene, propane and dimethyl ether, by mass percent of 41 percent: 43%: 16 percent of the raw materials are mixed and prepared, and the welding gas mixture without oxygen combustion supporting can be prepared. Under the condition that pure oxygen is not needed for combustion supporting, the actual combustion temperature can reach 1536 ℃, the continuous combustion time is 151 minutes, the gun barrel of the welding gun cannot be heated after 1 hour of use, and the welding effect is good.
Example 4
The liquefied gas comprises three liquefied gases, namely propylene, propane and dimethyl ether, and is prepared from the following components in percentage by mass 42%: 45%: 1 percent of the gas mixture is mixed with 3 percent of the gas mixture to prepare the welding gas mixture without oxygen combustion supporting. Under the condition that pure oxygen is not needed for combustion supporting, the actual combustion temperature can reach 1535 ℃, the continuous combustion time is 158 minutes, the gun barrel of the welding gun cannot be heated after 1 hour of use, and the welding effect is good.
Example 5
The liquefied gas comprises 43 percent of propylene, propane and dimethyl ether by mass percent: 44.5%: 12.5 percent of the raw materials are mixed and prepared to prepare the welding gas mixture without oxygen combustion supporting. Under the condition that pure oxygen is not needed for combustion supporting, the actual combustion temperature can reach 1556 ℃, the continuous combustion time is 155 minutes, the gun barrel of the welding gun cannot be heated after 1 hour of use, and the welding effect is good.
Example 6
The liquefied gas comprises three liquefied gases of propylene, propane and dimethyl ether, wherein the three liquefied gases are 44.5 percent by mass: 44%: 11.5 percent of the raw materials are mixed and prepared to prepare the welding gas mixture without oxygen combustion supporting. Under the condition that pure oxygen is not needed for combustion supporting, the actual combustion temperature can reach 1558 ℃, the continuous combustion time is 157 minutes, the gun barrel of the welding gun cannot be heated after 1 hour of use, and the welding effect is good.
Example 7
The liquefied gas comprises three liquefied gases of propylene, propane and dimethyl ether, wherein the three liquefied gases are respectively 45% by mass: 43%: 12 percent of the raw materials are mixed and prepared to prepare the welding gas mixture without oxygen combustion supporting. Under the condition that pure oxygen is not needed for combustion supporting, the actual combustion temperature can reach 1549 ℃, the continuous combustion time is 159 minutes, the gun barrel of the welding gun cannot be heated after 1 hour of use, and the welding effect is good.
Example 8
The liquefied gas comprises 46 percent of propylene, 46 percent of propane and 46 percent of dimethyl ether by mass percent: 43.5%: 10.5 percent of the raw materials are mixed and prepared to prepare the welding gas mixture without oxygen combustion supporting. Under the condition that pure oxygen is not needed for combustion supporting, the actual combustion temperature can reach 1545 ℃, the continuous combustion time is 160 minutes, the gun barrel of the welding gun cannot be heated after 1 hour of use, and the welding effect is good.
Example 9
The liquefied gas comprises three liquefied gases of propylene, propane and dimethyl ether in percentage by mass of 48%: 42%: 10 percent of the raw materials are mixed and prepared to prepare the welding gas mixture without oxygen combustion supporting. Under the condition that pure oxygen is not needed for combustion supporting, the actual combustion temperature can reach 1541 ℃, the continuous combustion time is 153 minutes, the gun barrel of the welding gun cannot be heated after 1 hour of use, and the welding effect is good.
Example 10
The liquefied gas comprises 50 percent of propylene, 50 percent of propane and 50 percent of dimethyl ether by mass percent: 38%: 12 percent of the raw materials are mixed and prepared to prepare the welding gas mixture without oxygen combustion supporting. Under the condition that pure oxygen is not needed for combustion supporting, the actual combustion temperature can reach 1535 ℃, the continuous combustion time is 160 minutes, the gun barrel of the welding gun cannot be heated after 1 hour of use, and the welding effect is good.
Example 11
The liquefied gas comprises three liquefied gases, namely propylene, propane and dimethyl ether, in percentage by mass of 52%: 37%: 11 percent of the raw materials are mixed and prepared, and the welding gas mixture without oxygen combustion supporting can be prepared. Under the condition that pure oxygen is not needed for combustion supporting, the actual combustion temperature can reach 1533 ℃, the continuous combustion time is 161 minutes, the gun barrel of the welding gun cannot be heated after 1 hour of use, and the welding effect is good.
Comparing the performance of the copper pipe welding gas and other fuel gases provided by the invention, the following results are obtained:
compared with the data of the copper pipe welding gas and other gases, the copper pipe welding gas provided by the invention has the advantages that the cost is low, and the flame temperature is close to that of MAPP gas, so that the copper pipe welding gas can be used instead of imported copper pipe welding gas, the use cost is effectively reduced, and the welding safety and flexibility are improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the technical principles thereof
Should also be considered as the scope of protection of the present invention.
Claims (3)
1. The welding gas mixture without oxygen combustion supporting is formed by mixing propylene, propane and dimethyl ether according to a certain proportion, wherein in the gas mixture, the mass percentage of the propylene is 38-52%, the mass percentage of the propane is 35-53%, and the mass percentage of the dimethyl ether is 9-25%.
2. The gas mixture according to claim 1, wherein the propylene is present in an amount of 41 to 50% by mass, the propane is present in an amount of 36 to 49% by mass, and the dimethyl ether is present in an amount of 10 to 16% by mass.
3. The gas mixture according to claim 1 or 2, wherein the mass percentage of propylene is 43-46%, the mass percentage of propane is 43-45%, and the mass percentage of dimethyl ether is 10.5-12.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010902158.3A CN112195050A (en) | 2020-09-01 | 2020-09-01 | Welding gas mixture without oxygen combustion supporting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010902158.3A CN112195050A (en) | 2020-09-01 | 2020-09-01 | Welding gas mixture without oxygen combustion supporting |
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| Publication Number | Publication Date |
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| CN112195050A true CN112195050A (en) | 2021-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010902158.3A Pending CN112195050A (en) | 2020-09-01 | 2020-09-01 | Welding gas mixture without oxygen combustion supporting |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1724620A (en) * | 2005-07-05 | 2006-01-25 | 泸天化（集团）有限责任公司 | Energy-saving environmental protection type dimethylether industrial cutting gas |
| CN101275090A (en) * | 2008-04-24 | 2008-10-01 | 杭州艾尔柯制冷剂科技有限公司 | Mapp gas |
| CN101353604B (en) * | 2008-09-04 | 2011-03-23 | 宁波考尔曼制冷工业有限公司 | Gas mixture substituting for MAPP gas |
| US10385285B2 (en) * | 2015-02-25 | 2019-08-20 | Illinois Tool Works Inc. | Fuel and propellant composition for combustion tools |
| CN110343554A (en) * | 2019-07-16 | 2019-10-18 | 杭州艾尔柯制冷剂科技有限公司 | A kind of copper pipe welding gas significantly improving flame jeting effect |
| CN110358593A (en) * | 2019-07-16 | 2019-10-22 | 杭州艾尔柯制冷剂科技有限公司 | A kind of combustion-supporting copper pipe welding gas of anoxic |
-
2020
- 2020-09-01 CN CN202010902158.3A patent/CN112195050A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1724620A (en) * | 2005-07-05 | 2006-01-25 | 泸天化（集团）有限责任公司 | Energy-saving environmental protection type dimethylether industrial cutting gas |
| CN101275090A (en) * | 2008-04-24 | 2008-10-01 | 杭州艾尔柯制冷剂科技有限公司 | Mapp gas |
| CN101353604B (en) * | 2008-09-04 | 2011-03-23 | 宁波考尔曼制冷工业有限公司 | Gas mixture substituting for MAPP gas |
| US10385285B2 (en) * | 2015-02-25 | 2019-08-20 | Illinois Tool Works Inc. | Fuel and propellant composition for combustion tools |
| CN110343554A (en) * | 2019-07-16 | 2019-10-18 | 杭州艾尔柯制冷剂科技有限公司 | A kind of copper pipe welding gas significantly improving flame jeting effect |
| CN110358593A (en) * | 2019-07-16 | 2019-10-22 | 杭州艾尔柯制冷剂科技有限公司 | A kind of combustion-supporting copper pipe welding gas of anoxic |
Non-Patent Citations (1)
| Title |
|---|
| 河南省劳动和社会保障厅: "《电焊工》", 29 February 2008, 郑州：河南科学技术出版社 * |
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Application publication date: 20210108 |