CN101353604B - Gas mixture substituting for MAPP gas - Google Patents
Gas mixture substituting for MAPP gas Download PDFInfo
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- CN101353604B CN101353604B CN2008101204532A CN200810120453A CN101353604B CN 101353604 B CN101353604 B CN 101353604B CN 2008101204532 A CN2008101204532 A CN 2008101204532A CN 200810120453 A CN200810120453 A CN 200810120453A CN 101353604 B CN101353604 B CN 101353604B
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- gas
- propane
- propylene
- mapp
- combustion
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- VBUBYMVULIMEHR-UHFFFAOYSA-N propa-1,2-diene;prop-1-yne Chemical compound CC#C.C=C=C VBUBYMVULIMEHR-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 239000000203 mixture Substances 0.000 title claims description 14
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims abstract description 56
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000001294 propane Substances 0.000 claims abstract description 28
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims abstract description 27
- 239000008246 gaseous mixture Substances 0.000 claims description 20
- 239000007789 gas Substances 0.000 abstract description 43
- 238000002485 combustion reaction Methods 0.000 abstract description 27
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 abstract description 9
- 238000005219 brazing Methods 0.000 abstract description 7
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 abstract description 6
- 238000003466 welding Methods 0.000 abstract description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 4
- 239000001301 oxygen Substances 0.000 abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000005496 tempering Methods 0.000 abstract description 3
- 239000000779 smoke Substances 0.000 abstract description 2
- 229910000679 solder Inorganic materials 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract 1
- 238000012856 packing Methods 0.000 abstract 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 7
- HSFWRNGVRCDJHI-UHFFFAOYSA-N Acetylene Chemical compound C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000003915 liquefied petroleum gas Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- MWWATHDPGQKSAR-UHFFFAOYSA-N propyne Chemical compound CC#C MWWATHDPGQKSAR-UHFFFAOYSA-N 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- IYABWNGZIDDRAK-UHFFFAOYSA-N allene Chemical compound C=C=C IYABWNGZIDDRAK-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- GVNVAWHJIKLAGL-UHFFFAOYSA-N 2-(cyclohexen-1-yl)cyclohexan-1-one Chemical compound O=C1CCCCC1C1=CCCCC1 GVNVAWHJIKLAGL-UHFFFAOYSA-N 0.000 description 1
- 208000005623 Carcinogenesis Diseases 0.000 description 1
- 101150065749 Churc1 gene Proteins 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 208000001034 Frostbite Diseases 0.000 description 1
- 241000702321 Microvirus Species 0.000 description 1
- 102100038239 Protein Churchill Human genes 0.000 description 1
- 229910000635 Spelter Inorganic materials 0.000 description 1
- OUUQCZGPVNCOIJ-UHFFFAOYSA-M Superoxide Chemical compound [O-][O] OUUQCZGPVNCOIJ-UHFFFAOYSA-M 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 230000036952 cancer formation Effects 0.000 description 1
- 231100000504 carcinogenesis Toxicity 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000011365 complex material Substances 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003533 narcotic effect Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 235000019605 sweet taste sensations Nutrition 0.000 description 1
Landscapes
- Feeding And Controlling Fuel (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to an MAPP gas which is formed by mixing propane, propylene and dimethyl ether according to a certain proportion, wherein, the propane takes up 18 to 22 percent of the total components, the propylene takes up 36 to 44 percent of the total components, and the dimethyl ether takes up 36 to 44 percent of the total components. By using special welding sets and packing containers, the actual combustion temperature of the MAPP gas can reach above 1350 DEG C (in general, the actual combustion temperature of liquid gas is 600 to 800 degrees) in the situation that no pure oxygen is used for supporting combustion. The MAPP gas of the invention has wide and stable source of raw materials, low price, higher security, easy carrying, and no phenomena such as black smoke and tempering, etc. in the combustion process, and is a solder brazing gas which can be directly used for brazing without the help of oxygen.
Description
(1) technical field
The present invention relates to a kind of industrial welding gas, be particularly useful for gas brazing.
(2) background technology
MAPP gas is a kind ofly to be used for soldering and to connect special gas mixture with brazing.External MAPP gas is the mixture that propine, propadiene add partial liquefaction gas, and wherein preceding two kinds of compositions are that China's output is very rare, only are used in the laboratory, and suitability for industrialized production is reality inadequately.Therefore it is wide to need to seek a kind of source, and the new gas mixture that cost is low is the MAPP gas of main component to substitute with propine and propadiene.
(3) summary of the invention
It is stable that the object of the invention provides a kind of safe, flame temperature, the gaseous mixture that is applicable to the alternative MAPP gas of various brazing occasions with low cost.
The technical solution used in the present invention is:
A kind of gaseous mixture of alternative MAPP gas, by propane, propylene, dme (18～22) % by mass percentage: (36～44) %: (36～44) % mixes.
Gaseous mixture of the present invention allows to contain the rare gas element impurity of trace, purity 〉=99.8% of preferred propane, the purity of propylene 〉=99.8%, the purity of dme 〉=99.8%, the effective ingredient of propane, propylene and dme three sum accounts for total component 〉=99.8%.
Preferably, the gaseous mixture of described alternative MAPP gas is that propane, propylene, dme mass ratio are 1: 2: 2 mixture.
Propane (propane, C
3H
8) normal temperature is down colourless, no odour.Inflammable, explosive.Chemical property is stable.Molecular weight: 40.09, fusing point :-187.7 ℃, boiling point :-42.17 ℃, flash-point :-104 ℃, critical temperature: 96.8 ℃, emergent pressure: 4.25MPa, ignition temperature: 450 ℃, vapour density 1.52g/L, limits of explosion is 2.1%～9.5%, saturation vapour pressure (55.6 ℃): 53.32kPa, the combustion heat: 2217.8kJ/mol, in the time of 650 ℃, be decomposed into ethene and ethane, solvability: be slightly soluble in water, be dissolved in ethanol, ether.Propane belongs to micro-virus kind, is simple narcotic, and is non-stimulated to eye and skin, and directly contact can cause frostbite.
Propylene (propene, CH
2=CHCH
3) normal temperature is down for colourless, odorless, have the gas of sweet taste slightly.Molecular weight 42.08, density (20/4 ℃): 0.5139g/cm
3, zero pour :-185.25 ℃, boiling point :-47.4 ℃, critical temperature: 91.9 ℃, emergent pressure: 4.6MPa, inflammable, limits of explosion is 2%～11%.Water insoluble, be dissolved in organic solvent, belong to lower toxicity.
Dme (dimethyl ether, CH
3OCH
3) be a kind of colourless gas, have slight ether fragrance, the vapor pressure under the room temperature is about 0.5MPa, and it is very similar to the physical properties of liquefied petroleum gas (LPG).Relative molecular weight or nucleidic mass 46.07; Density relative density 1.617 (air=1); Fusing point-138.5 ℃; Boiling point-24.5 ℃; Flash-point-41.4 ℃; Water-soluble and ethanol, 128.8 ℃ of critical temperatures, emergent pressure 5.32MPa, fluid density 0.661g/cm
3Dme has inertia, non-corrosiveness, non-carcinogenesis, almost non-toxic.Different with diethyl ether, dme did not expose to the open air in the air midium or long term can form superoxide.The saturation vapour pressure of dme is lower than liquefied gas, it is more safer than liquefied petroleum gas (LPG) to store transportation, and have good burning performance, the thermo-efficiency height, there are not residue, no black smoke in the combustion processes, CO, NO discharge capacity are low, and dme also can mix oil liquefied gas, coal gas or Sweet natural gas multifuel combustion and can improve heat, 〉=95% dme can be directly as an alternative the fuel of liquefied gas use.So it will be a kind of ideal clean fuel that replaces liquefied gas.
Three kinds of raw materials that the present invention relates to are products that all there is production China various places, and propane, propylene are the byproducts (chemical by-product rank) of petrochemical complex, and raw material sources are extensive, stable, low price.The gaseous mixture principle is to utilize the propylene temperature of combustion with the approaching characteristic of propine, and the Sauerstoffatom in the dme molecular structure can increase the supply of Sauerstoffatom in the combustion processes, promotes the raising of temperature of combustion.And dme itself be our country at the environment-friendly fuel of wideling popularize, its source is wide, and is with low cost.Simple said two products incomplete combustion can occur when burning, the remainder dme can't after-flame problem, so added a certain proportion of propane again its each composition is evenly disengaged in when burning, can guarantee that the gas in the container fully burns down, also reduced production cost simultaneously.
Use special soldering set and packaging vessel, gaseous mixture of the present invention is under the situation combustion-supporting without pure oxygen, and actual combustion temperature can reach 1350 degree Celsius above (actual combustion temperature of general liquefied gas is 600～800 degree).
The advantage of gaseous mixture of the present invention be security than higher, carry easily, do not have phenomenons such as over-emitting black exhaust, tempering in the combustion processes.Compare acetylene (temperature of combustion height, easily tempering, poor stability, production process has very big pollution to environment), pure propane (temperature of combustion is not high enough), (added additives such as benzene, hydrogen peroxide, toxicity is big for other industrial gasses, health to the end user is harmful), gaseous mixture of the present invention is safe, practical more economically.The gaseous mixture of the present invention test pressure of gas at normal temperatures is 1.2MPa, and the use body temperature of not stopping for a long time has decline, even still can reach 0.3MP in the situation overdraft of body dew.Because the temperature profile of its uniqueness, can guarantee can be because the molecular structure of the too high damage copper pipe of temperature can effectively not melt spelter solder (general fusing point is about 950 degree) simultaneously again in welding process, and it is mobile that scolder can fully be melted.
In sum, other industrial welding gas must pass through comburant oxygen, will be equipped with oxygen cylinder in the use, increased the potentially dangerous of using, and gaseous mixture of the present invention is to help oxygen can be directly used in the brazing gas of brazing.
(4) embodiment
The present invention is described further below in conjunction with specific embodiment, but protection scope of the present invention is not limited in this:
Embodiment 1:
Mix at 1: 2: 2 with mass ratio by propane, propylene, three kinds of liquefied gas of dme, promptly get the liquefied gas that substitutes MAPP.Under the situation combustion-supporting without pure oxygen, its actual combustion temperature can reach 1358 degree Celsius.
One, combustionproperty test and instrument:
1) thermometer precision: ± 1 ℃.Useful range: (0～100) ℃.
2) high-precision temperature table: 0.1 ℃ (below 1000 ℃).1 ℃ (more than 1000 ℃).Working conditions: 0～50 ℃ of cold junction temperature: compensation automatically.
3) tensimeter: precision 5psi, useful range: (0～500) psi.
4) electronic balance precision: 0.1g.
5) stopwatch, welding gun, ignition device.
6) claim empty bottle weight, get weight behind the liquefied gas that its can substitutes MAPP, and related data record (seeing Table 1).
Table 1
| Tare weight (g) | Gross weight (g) | Net weight (g) | Pressure (psi) | The sustained combustion time (min) | Envrionment temperature ℃ | Surplus (g) |
| 443.0? | 843.6? | 400.6? | 141? | 113.0? | 26? | 1.2? |
Test in the combustion processes: welding gun is heavy: 377g;
Use the ignition of straight type spray gun, test, record quantity combusted-time-pressure-temperature relation (seeing Table 2).
Two, to data declaration in the form 2:
Gross weight=gross weight+welding gun weight=843.6+377=1220.6g;
Weight=electronic balance displayed value has burnt;
Table 2
| Gross weight | Burning back weight (g) | The clean amount of burning (g) | Temperature of combustion (℃) | Pressure (psi) | Time spent (min) | Envrionment temperature (℃) |
| 1220.6? | 1210.6? | 10? | 1356? | 141? | 2.9? | 26? |
| 1220.6? | 1200.6? | 20? | 1358? | 140? | 5.7? | 26? |
| 1220.6? | 1190.6? | 30? | 1359? | 138? | 8.6? | 26? |
| 1220.6? | 1180.6? | 40? | 1359? | 135? | 11.4? | 26? |
| 1220.6? | 1170.6? | 50? | 1359? | 130? | 14.3? | 26? |
| 1220.6? | 1160.6? | 60? | 1358? | 128? | 17.1? | 26? |
| 1220.6? | 1150.6? | 70? | 1358? | 125? | 20.0? | 26? |
| 1220.6? | 1140.6? | 80? | 1358? | 120? | 22.9? | 26? |
| 1220.6? | 1130.6? | 90? | 1358? | 115? | 25.7? | 26? |
| 1220.6? | 1120.6? | 100? | 1359? | 89? | 28.6? | 26? |
| 1220.6? | 1110.6? | 110? | 1358? | 88? | 31.4? | 26? |
| 1220.6? | 1100.6? | 120? | 1360? | 86? | 34.3? | 26? |
| 1220.6? | 1090.6? | 130? | 1360? | 86? | 37.1? | 26? |
| 1220.6? | 1080.6? | 140? | 1360? | 85? | 40.0? | 26? |
| 1220.6? | 1070.6? | 150? | 1360? | 85? | 42.9? | 26? |
| 1220.6? | 1060.6? | 160? | 1360? | 85? | 45.7? | 26? |
| 1220.6? | 1050.6? | 170? | 1358? | 80? | 48.6? | 26? |
| 1220.6? | 1040.6? | 180? | 1359? | 80? | 51.4? | 26? |
| 1220.6? | 1030.6? | 190? | 1359? | 78? | 54.3? | 26? |
| 1220.6? | 1020.6? | 200? | 1359? | 78? | 57.1? | 26? |
| 1220.6? | 1010.6? | 210? | 1359? | 76? | 60.0? | 26? |
| 1220.6? | 1000.6? | 220? | 1360? | 76? | 62.9? | 26? |
| 1220.6? | 990.6? | 230? | 1360? | 74? | 65.7? | 26? |
| 1220.6? | 980.6? | 240? | 1360? | 74? | 68.6? | 26? |
| 1220.6? | 970.6? | 250? | 1360? | 70? | 71.4? | 26? |
| 1220.6? | 960.6? | 260? | 1360? | 70? | 74.3? | 26? |
| 1220.6? | 950.6? | 270? | 1360? | 70? | 77.1? | 26? |
| 1220.6? | 940.6? | 280? | 1358? | 68? | 80.0? | 26? |
| 1220.6? | 930.6? | 290? | 1358? | 68? | 82.9? | 26? |
| 1220.6? | 920.6? | 300? | 1357? | 65? | 85.7? | 26? |
| 1220.6? | 910.6? | 310? | 1357? | 62? | 88.6? | 26? |
| 1220.6? | 900.6? | 320? | 1357? | 60? | 91.4? | 26? |
| 1220.6? | 890.6? | 330? | 1357? | 60? | 94.3? | 26? |
| 1220.6? | 880.6? | 340? | 1356? | 58? | 97.1? | 26? |
| 1220.6? | 870.6? | 350? | 1355? | 58? | 100? | 26? |
| 1220.6? | 860.6? | 360? | 1355? | 55? | 102.9? | 26? |
| 1220.6? | 850.6? | 370? | 1356? | 50? | 105.7? | 26? |
| 1220.6? | 840.6? | 380? | 1354? | 40? | 108.6? | 26? |
| 1220.6? | 830.6? | 390? | 1352? | 30? | 111.4? | 26? |
| 1220.6? | 821.8? | 398.8? | 1351? | 10? | 113.0? | 26? |
The gaseous mixture that the present invention of table 2 data declaration substitutes MAPP gas is that a kind of temperature of combustion is stable, safety, welding gas efficiently.
Embodiment 2:
With 1: 2.36: 2 mass ratio propane, propylene, three kinds of liquefied gas of dme are mixed, just propane and dme ratio are constant, propylene content is adjusted into accounts for total component 44%, must substitute the gaseous mixture of MAPP gas.Under the situation combustion-supporting without pure oxygen, its actual combustion temperature can reach more than 1350 degree Celsius.
Embodiment 3:
With 1: 1.69: 2 mass ratio propane, propylene, three kinds of liquefied gas of dme are mixed, just propane and dme ratio are constant, propylene content is adjusted into accounts for total component 36%, promptly get the gaseous mixture that substitutes MAPP gas.Under the situation combustion-supporting without pure oxygen, its actual combustion temperature can reach more than 1350 degree Celsius.
Embodiment 4:
With 1.13: 2: 2 mass ratioes propane, propylene, three kinds of liquefied gas of dme are mixed, just propylene and dme ratio are constant, propane content is adjusted into accounts for total component 22%, promptly get the gaseous mixture that substitutes MAPP gas.Under the situation combustion-supporting without pure oxygen, its actual combustion temperature can reach more than 1350 degree Celsius.
Embodiment 5:
With 0.8: 2: 2 mass ratio propane, propylene, three kinds of liquefied gas of dme are mixed, just propylene and dme ratio are constant, propane content is adjusted into accounts for total component 18%, promptly get the gaseous mixture that substitutes MAPP gas.Under the situation combustion-supporting without pure oxygen, its actual combustion temperature can reach more than 1350 degree Celsius.
Embodiment 6:
With 1: 2: 2.36 mass ratio propane, propylene, three kinds of liquefied gas of dme are mixed, just propane and propylene ratio are constant, propylene content is adjusted into accounts for total component 44%, promptly get the gaseous mixture that substitutes MAPP gas.Under the situation combustion-supporting without pure oxygen, its actual combustion temperature can reach more than 1350 degree Celsius.
Embodiment 7:
With 1: 2: 1.69 mass ratio propane, propylene, three kinds of liquefied gas of dme are mixed, just propane and propylene ratio are constant, propylene content is adjusted into accounts for total component 36%, promptly get the gaseous mixture that substitutes MAPP gas.Under the situation combustion-supporting without pure oxygen, its actual combustion temperature can reach more than 1350 degree Celsius.
Claims (2)
1. the gaseous mixture of an alternative MAPP gas, it is the mixture that mixes by a certain percentage by propane, propylene, dme, in the described mixture, propane quality percentage composition is 18%～22%, propylene quality percentage composition is 36%～44%, and dme quality percentage composition is 36%～44%.
2. the gaseous mixture of alternative MAPP gas according to claim 1 is characterized in that described propane, propylene, dme mass ratio are 1: 2: 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101204532A CN101353604B (en) | 2008-09-04 | 2008-09-04 | Gas mixture substituting for MAPP gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101204532A CN101353604B (en) | 2008-09-04 | 2008-09-04 | Gas mixture substituting for MAPP gas |
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| Publication Number | Publication Date |
|---|---|
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| CN101353604B true CN101353604B (en) | 2011-03-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112195049A (en) * | 2020-09-01 | 2021-01-08 | 宁波盾科新材料有限公司 | Welding gas mixture without oxygen combustion supporting |
| CN112195048A (en) * | 2020-09-01 | 2021-01-08 | 宁波盾科新材料有限公司 | Welding gas mixture without oxygen combustion supporting |
| CN112195050A (en) * | 2020-09-01 | 2021-01-08 | 宁波盾科新材料有限公司 | Welding gas mixture without oxygen combustion supporting |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103060034B (en) * | 2012-12-25 | 2015-07-08 | 克得生 | Hybrid welding gas |
-
2008
- 2008-09-04 CN CN2008101204532A patent/CN101353604B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112195049A (en) * | 2020-09-01 | 2021-01-08 | 宁波盾科新材料有限公司 | Welding gas mixture without oxygen combustion supporting |
| CN112195048A (en) * | 2020-09-01 | 2021-01-08 | 宁波盾科新材料有限公司 | Welding gas mixture without oxygen combustion supporting |
| CN112195050A (en) * | 2020-09-01 | 2021-01-08 | 宁波盾科新材料有限公司 | Welding gas mixture without oxygen combustion supporting |
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| Publication number | Publication date |
|---|---|
| CN101353604A (en) | 2009-01-28 |
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