CN109967909B - Gas protection process for weld back of water tank main body of high-speed motor train unit - Google Patents
Gas protection process for weld back of water tank main body of high-speed motor train unit Download PDFInfo
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- CN109967909B CN109967909B CN201910370919.2A CN201910370919A CN109967909B CN 109967909 B CN109967909 B CN 109967909B CN 201910370919 A CN201910370919 A CN 201910370919A CN 109967909 B CN109967909 B CN 109967909B
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- 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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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Abstract
The invention relates to a gas protection process for the back of a main body weld of a water tank of a high-speed motor train unit, which comprises a water tank, wherein the water tank is welded into a tetragonal structure through six stainless steel plates, main body weld joints are formed on two long edges of the upper surface of the water tank and four vertical edges of the side surface of the water tank, and each weld joint is subjected to gas protection. The invention has convenient operation, carries out back gas protection on the main body welding line of the water tank liner, can effectively prevent the back surface of the main body welding line from being oxidized, improves the quality of the main body welding line, and improves the sealing performance and the corrosion resistance of the water tank; and meanwhile, the main body welding seam sand blasting process can be eliminated, and the production efficiency is improved.
Description
Technical Field
The invention relates to the technical field of gas protection processes, in particular to a gas protection process for the back of a weld joint of a water tank main body of a high-speed motor train unit.
Background
The operation speed per hour of the standard motor train unit is 350 kilometers. The water tank is part of a water supply system of the whole motor train unit; as the water sources of the drinking water for the toilets, the kitchens and the passengers on the vehicles are all from the water tanks, the requirements on the sealing property and the corrosion resistance of the welded water tanks are very strict.
In the prior art, the original method for protecting the gas at the back of the main body welding seam comprises the following steps: use the aluminium foil sticky tape to paste along the main part welding seam, from one end to the inside argon gas that fills of aluminium foil sticky tape, treat that the inside argon gas of aluminium foil sticky tape uses the aluminium foil sticky tape to seal up the other end after with the air exhaust, the welder weld according to corresponding welding process file can, its convenient operation, but have following shortcoming:
(1) the shape of a cavity formed by the aluminum foil adhesive tape along the main body welding seam is not uniform, so that different argon flows at different positions can be caused, and the protection effect of the back of the main body welding seam at different positions can be influenced;
(2) because of can producing a large amount of heats among the welding process, can lead to the aluminium foil sticky tape to be melted, need to use means such as sandblast will melt the residue on the main part welding seam to get rid of after welding, extravagant a large amount of manpower, material resources influence production efficiency.
Disclosure of Invention
The applicant provides a gas protection process for the back of the weld joint of the main body of the water tank of the high-speed motor train unit aiming at the defects in the prior art, so that the quality and the attractiveness of the weld joint of the main body on the back of the weld joint of the main body are improved, the production efficiency is improved, and the sealing performance and the corrosion resistance of the inner container of the water tank in the long-term use process are ensured.
The technical scheme adopted by the invention is as follows:
a gas protection process for the back of a weld joint of a main body of a water tank of a high-speed motor train unit comprises the water tank, wherein the water tank is welded into a square structure through six stainless steel plates, main body weld joints are formed on two long edges of the upper surface of the water tank and four vertical edges of the side surface of the water tank,
the specific protection process is as follows:
the first step is as follows: wiping the main body welding line by dipping alcohol or acetone on non-woven fabrics, and removing oil stains and dust within the range of 25mm around the main body welding line;
the second step is that: preparing two snakeskin tubes, bending the two snakeskin tubes into an L-shaped structure, respectively placing the two snakeskin tubes along main body welding seams on two sides of the water tank, and simultaneously corresponding to the positions of the three main body welding seams after one snakeskin tube is bent;
the third step: the pipe wall of each snakeskin pipe is uniformly provided with air holes, one end of each snakeskin pipe is closed, argon is introduced into the end of the other end of each snakeskin pipe through a connecting pipe, and when the air is continuously introduced, stable air flow can be obtained through the air holes so as to protect the back surface of a main welding line from being oxidized;
the fourth step: fixing the snakeskin tube on the position of the main body welding line by using a polyimide film adhesive tape;
the fifth step: two minutes before welding, 99.99 percent of argon is filled in the flexible bellows according to the requirement in the third step;
and a sixth step: welding according to the corresponding welding process file by a welder;
the seventh step: and after the welding is finished, cooling the main body welding line for 3-10 minutes, and removing the polyimide film adhesive tape and the snakeskin tube to obtain the main body welding line with good surface quality and golden color.
As a further improvement of the above technical solution:
in the second step, the flexible pipe is made of stainless steel with the diameter of 15 mm.
And in the seventh step, the cooling mode is air cooling, and the cooling time is 5 minutes.
The polyimide film adhesive tape is a fiber-free adhesive tape.
The invention has the following beneficial effects:
the invention has convenient operation, carries out back gas protection on the main body welding line of the water tank liner, can effectively prevent the back surface of the main body welding line from being oxidized, improves the quality of the main body welding line, and improves the sealing performance and the corrosion resistance of the water tank; and meanwhile, the main body welding seam sand blasting process can be eliminated, and the production efficiency is improved.
According to the invention, the polyimide film adhesive tape is adopted to seal the end opening of the snakeskin tube, the polyimide film adhesive tape can resist high temperature, no adhesive residue phenomenon exists on the surface when the adhesive tape is removed after welding, the adhesive residue is removed without sand blasting, and the attractiveness is ensured.
According to the design of the snakeskin tube, the snakeskin tube has good flexibility, high temperature resistance, wear resistance and tensile resistance, can be manually bent into a required shape, and is convenient to be attached to welding seams at different positions; meanwhile, the vent holes are uniformly distributed on the pipe wall, so that uniform and stable protective airflow can be formed on the surface of the welding seam, and the welding seam is prevented from being oxidized in the welding process.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein: 1. a water tank; 2. a main body weld; 3. a flexible conduit.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in FIG. 1, the gas protection process for the back of the weld joint of the water tank main body of the high-speed motor train unit comprises a water tank 1, wherein the water tank 1 is welded into a square structure through six stainless steel plates, main body weld joints 2 are formed on two long edges of the upper surface of the water tank 1 and four vertical edges of the side surface of the water tank 1,
the specific protection process is as follows:
the first step is as follows: wiping the main body welding line 2 by dipping alcohol or acetone on non-woven fabrics, and removing oil stains and dust within the range of 25mm around the main body welding line 2;
the second step is that: preparing two snakeskin tubes 3, bending the snakeskin tubes into an L-type structure, respectively placing the L-type structure along main body welding seams 2 on two sides of a water tank 1, and simultaneously corresponding to the positions of the three main body welding seams 1 after one snakeskin tube 3 is bent;
the third step: the pipe wall of each snakeskin pipe 3 is uniformly distributed with air holes, one end of each snakeskin pipe 3 is closed, argon is introduced into the other end of each snakeskin pipe through a connecting pipe, and when the air is continuously introduced, stable air flow can be obtained through the air holes so as to protect the back surface of the main body welding line 2 from oxidation;
the fourth step: fixing the flexible pipe 3 on the position of the main body welding line 2 by using a polyimide film adhesive tape;
the fifth step: two minutes before welding, 99.99 percent of argon is filled in the flexible metal hose 3 according to the requirement in the third step;
and a sixth step: welding according to the corresponding welding process file by a welder;
the seventh step: after welding, after the main body welding seam 2 is cooled for 3-10 minutes, the polyimide film adhesive tape and the snakeskin tube 3 are removed, and the main body welding seam 2 with good surface quality and golden color can be obtained.
In the second step, the flexible pipe 3 is made of stainless steel with the diameter of 15 mm.
And in the seventh step, the cooling mode is air cooling, and the cooling time is 5 minutes.
The polyimide film adhesive tape is a fiber-free adhesive tape.
The first embodiment is as follows:
a process for protecting gas of a liner of a water tank of a high-speed motor train unit at the back of a weld joint of a main body comprises the following process steps:
the water tank 1 is mainly formed by welding six stainless steel plates, after the lower water tank is welded, non-woven fabrics are needed to dip alcohol or acetone for wiping, and oil stains and dust within the range of 25mm around a main body welding line 2 are removed;
secondly, placing a 304 snakeskin pipe 3 with the diameter of 15mm along the main body welding seam 2 of the lower water tank;
thirdly, sealing two ends of the air pipe by using a polyimide film adhesive tape (without fibers);
fourthly, fixing the flexible pipe 3 on the position of the main body welding seam 2 by using a polyimide film adhesive tape;
welding by a welder according to the corresponding welding process file; 2 minutes before welding, 99.99 percent argon gas needs to be filled into the snakeskin tube 3;
and (VI) after the welding is finished, cooling the main body welding seam 2, and after 5 minutes, removing the adhesive tape and the flexible pipe 3 to obtain the main body welding seam 2 with good surface quality and golden color.
And testing the water tank subjected to welding back gas protection, wherein the testing process is as follows:
a. all outlets were plugged, with one outlet plugged with a pressure gauge.
b. The water tank is filled with water by a pressure pump and the pressure gauge reaches the specified pressure.
c. The pressurization was stopped and the pressure was maintained. The pressure is 25kpa, and the pressure is maintained for 1 h.
d. The powerful spot light checks whether the water tank is leaked.
e. The inside of the water tank is cleaned, and water collection and foreign matters are removed.
Example two:
a process for protecting gas of a liner of a water tank of a high-speed motor train unit at the back of a weld joint of a main body comprises the following process steps:
the water tank 1 is mainly formed by welding six stainless steel plates, after the lower water tank is welded, non-woven fabrics are needed to dip alcohol or acetone for wiping, and oil stains and dust within the range of 25mm around a main body welding line 2 are removed;
secondly, placing a 304 snakeskin pipe 3 with the diameter of 15mm along the main body welding seam 2 of the lower water tank;
thirdly, sealing two ends of the air pipe by using a polyimide film adhesive tape (without fibers);
fourthly, fixing the flexible pipe 3 on the position of the main body welding seam 2 by using a polyimide film adhesive tape;
welding by a welder according to the corresponding welding process file; 2 minutes before welding, 99.99 percent argon gas needs to be filled into the snakeskin tube 3;
and (VI) after the welding is finished, cooling the main body welding seam 2, and after 3 minutes, removing the adhesive tape and the flexible conduit 3 to obtain the main body welding seam 2 with good surface quality and golden color.
Example three:
a process for protecting gas of a liner of a water tank of a high-speed motor train unit at the back of a weld joint of a main body comprises the following process steps:
the water tank 1 is mainly formed by welding six stainless steel plates, after the lower water tank is welded, non-woven fabrics are needed to dip alcohol or acetone for wiping, and oil stains and dust within the range of 25mm around a main body welding line 2 are removed;
secondly, placing a 304 snakeskin pipe 3 with the diameter of 15mm along the main body welding seam 2 of the lower water tank;
thirdly, sealing two ends of the air pipe by using a polyimide film adhesive tape (without fibers);
fourthly, fixing the flexible pipe 3 on the position of the main body welding seam 2 by using a polyimide film adhesive tape;
welding by a welder according to the corresponding welding process file; 2 minutes before welding, 99.99 percent argon gas needs to be filled into the snakeskin tube 3;
and (VI) after the welding is finished, cooling the main body welding seam 2, and after 10 minutes, removing the adhesive tape and the flexible pipe 3 to obtain the main body welding seam 2 with good surface quality and golden color.
The invention has good weld processing effect, greatly improves the quality and the aesthetic property of the main body weld 2 at the back of the main body weld 2, improves the production efficiency and ensures the sealing property and the corrosion resistance of the water tank liner in the long-term use process.
The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.
Claims (4)
1. The utility model provides a high-speed EMUs water tank main part welding seam back gas protection technology, includes water tank (1), water tank (1) welds into the tetragonal structure through six stainless steel plates of face, its characterized in that: main body welding seams (2) are formed on two long edges of the upper surface of the water tank (1) and four vertical edges of the side surface,
the specific protection process is as follows:
the first step is as follows: wiping the main body welding line (2) by dipping alcohol or acetone on non-woven fabrics, and removing oil stains and dust within the range of 25mm around the main body welding line (2);
the second step is that: preparing two snakeskin tubes (3), bending the two snakeskin tubes into an L-shaped structure, respectively placing the two snakeskin tubes on two sides of the water tank (1) along the main body welding seams (2), and simultaneously corresponding to the positions of the three main body welding seams (2) after one snakeskin tube (3) is bent;
the third step: air holes are uniformly distributed on the pipe wall of each snakeskin pipe (3), one end of each snakeskin pipe (3) is closed, argon is introduced into the other end of each snakeskin pipe through a connecting pipe, and when the air is continuously introduced, stable air flow can be obtained through the air holes so as to protect the back surface of the main body welding line (2) from being oxidized;
the fourth step: fixing the snakeskin tube (3) on the position of the main body welding line (2) by using a polyimide film adhesive tape;
the fifth step: two minutes before welding, 99.99 percent of argon is filled in the flexible hose (3) according to the requirement in the third step;
and a sixth step: welding according to the corresponding welding process file by a welder;
the seventh step: after the welding is finished, after the main body welding seam (2) is cooled for 3-10 minutes, the polyimide film adhesive tape and the snakeskin tube (3) are removed, and the main body welding seam (2) with good surface quality and golden color can be obtained.
2. The high-speed motor train unit water tank main body weld back gas protection process as claimed in claim 1, characterized in that: in the second step, the flexible pipe (3) is made of stainless steel with the diameter of 15 mm.
3. The high-speed motor train unit water tank main body weld back gas protection process as claimed in claim 1, characterized in that: and in the seventh step, the cooling mode is air cooling, and the cooling time is 5 minutes.
4. The high-speed motor train unit water tank main body weld back gas protection process as claimed in claim 1, characterized in that: the polyimide film adhesive tape is a fiber-free adhesive tape.
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| CN201910370919.2A CN109967909B (en) | 2019-05-06 | 2019-05-06 | Gas protection process for weld back of water tank main body of high-speed motor train unit |
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| CN201910370919.2A CN109967909B (en) | 2019-05-06 | 2019-05-06 | Gas protection process for weld back of water tank main body of high-speed motor train unit |
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| CN109967909B true CN109967909B (en) | 2021-02-09 |
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| JPS61108478A (en) * | 1984-10-31 | 1986-05-27 | Toyota Motor Corp | Welding method for preventing generation of blow-hole |
| CN102873436A (en) * | 2012-10-30 | 2013-01-16 | 西安泵阀总厂有限公司 | Method for welding insulated joint bottoming |
| CN102935568B (en) * | 2012-11-15 | 2015-01-07 | 西安交通大学 | Laser welding clamp and protecting device for titanium alloy thin-walled workpiece in shape of complex space |
| CN106031960A (en) * | 2015-03-13 | 2016-10-19 | 哈尔滨飞机工业集团有限责任公司 | Inner surface gas protection device used when welding circular tube |
| CN107552985B (en) * | 2017-10-23 | 2020-04-21 | 中国十九冶集团有限公司 | Construction method for using ceramic liner for butt weld of steel box bridge |
| CN108406060A (en) * | 2018-04-16 | 2018-08-17 | 上海山安建设工程有限公司 | The stainless tube welding method of back side argon-filled protection |
| CN208246057U (en) * | 2018-04-18 | 2018-12-18 | 西南交通大学 | A kind of gas shield and molding control device for the molten soldering of dissimilar metal |
| CN108581139A (en) * | 2018-05-17 | 2018-09-28 | 四川石油天然气建设工程有限责任公司 | A kind of welding method of oil and gas transmission bimetal compound pipeline |
| CN109175635B (en) * | 2018-10-30 | 2020-11-10 | 中国航空制造技术研究院 | Local gas protection device and method for welding wall plate of metal sandwich structural member |
| CN109396621A (en) * | 2018-12-11 | 2019-03-01 | 云南大为化工装备制造有限公司 | A method of utilizing plasma welding soldering low alloy steel sheet butt weld |
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