CN103817415B - A kind of welding method of titanium ultra-thin tube - Google Patents

A kind of welding method of titanium ultra-thin tube Download PDF

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Publication number
CN103817415B
CN103817415B CN201410067020.0A CN201410067020A CN103817415B CN 103817415 B CN103817415 B CN 103817415B CN 201410067020 A CN201410067020 A CN 201410067020A CN 103817415 B CN103817415 B CN 103817415B
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Prior art keywords
welding
tube
heat exchanger
pipe
air inlet
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CN201410067020.0A
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CN103817415A (en
Inventor
苑玉玲
王升超
包俊礼
李英杰
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Core (shenyang) Heat Pump Technology Co Ltd
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Core (shenyang) Heat Pump Technology Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/16Arc welding or cutting making use of shielding gas
    • B23K9/167Arc welding or cutting making use of shielding gas and of a non-consumable electrode
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/235Preliminary treatment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/32Accessories
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00Articles made by soldering, welding or cutting
    • B23K2101/04Tubular or hollow articles
    • B23K2101/14Heat exchangers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00Materials to be soldered, welded or cut
    • B23K2103/08Non-ferrous metals or alloys
    • B23K2103/14Titanium or alloys thereof

Abstract

The invention belongs to welding field, particularly relate to a kind of welding method of titanium ultra-thin tube, tube sheet is holed, after heat exchanging pipe end cleans, heat exchanging tube hydroforming is assembled, and guaranteeing that heat exchanger tube stretches out tubesheet strength is 1 ~ 2 millimeter, and heat exchanger tube outer wall is to pore span from being no more than 0.15 millimeter; Adopt tube sheet automatic welding machine, heat exchanger tube outer wall and the two-sided argon shield of inwall; Purity of argon 99.999% high-purity argon, welding gun and workpiece fit tightly, all-position welding.The present invention realizes the two-sided gas shield of inside pipe wall and outer wall; in welding process; welding and the inside and outside gas of pipe realize synchronous; and saving gas; be not easy during welding to occur oxidation, due to adopted welding method, 0.8 millimeter and the welding of following heat exchanger tube can be realized; the fusion of exchanger tubes and tubesheets postwelding is good, suppresses and is not easy to reveal.

Description

A kind of welding method of titanium ultra-thin tube
Technical field
The invention belongs to welding field, particularly relate to a kind of welding method of titanium ultra-thin tube.
Background technology
Ti-heat exchanger manufactures, and bobbin carriage adopts titanium explosive clad plate and titanium pipe Welding Structure usually.Because titanium material price is higher, in order to reduce costs, on the basis meeting design strength, in design, multiselect tube wall is compared with the heat exchanger tube of thin structure, but concerning each manufactory, tube wall is thinner, welding difficulty is larger, if a thin-wall titanium tube to tube sheet welding difficult problem can be solved, a large amount of purchase cost can be reduced for enterprise undoubtedly.
Usually be the welding of 0.8 millimeter and above pipe thickness for heat exchanger tube wall thickness, be easier to realize welding, but easily occur after welding: exchanger tubes and tubesheets postwelding lack of fusion, weld seam severe oxidation, weld penetration is shallow, suppresses problems such as being easy to leakage, causes a large amount of reprocessing.Do not have maturation process to complete especially for 0.8 mm of thickness and the welding of following heat exchanger tube, this has also become the biggest problem of restriction enterprise processing and manufacturing titanium heat transmission equipment.
Summary of the invention
Technical problem to be solved by this invention is the welding method providing a kind of titanium ultra-thin tube, be intended to solve for 0.8 millimeter and the welding of following heat exchanger tube, exchanger tubes and tubesheets postwelding lack of fusion, weld seam severe oxidation, weld penetration is shallow, suppresses problems such as being easy to leakage.
The present invention is achieved in that a kind of welding method of titanium ultra-thin tube, it is characterized in that, comprises following step:
1) tube sheet is holed, pours out 1X35 ° of chamfering in the one end in hole, the size of holing and heat exchanger tube supporting;
2) before assembling, first heat exchanging pipe end carries out acid solution cleaning, removes oxide, then acid solution is cleaned with clear water, until expose silvery white metallic luster;
3) exchanger tubes and tubesheets assembling, together with first being installed to set of heat exchange tubes by a tube sheet, tube sheet one end frock is fixed, and guaranteeing that heat exchanger tube stretches out tubesheet strength is 1 ~ 2 millimeter, and heat exchanger tube outer wall is to pore span from being no more than 0.15 millimeter;
4) exchanger tubes and tubesheets welding:
Adopt tube sheet automatic welding machine, heat exchanger tube outer wall and the two-sided argon shield of inwall; Purity of argon 99.999% high-purity argon, welding gun and workpiece fit tightly, all-position welding; The welding parameter that tube sheet automatic welding machine adopts is: adopt pulse frequency to be no more than 0.2 second;
Welding parameter: tube head from melting welding, straight polarity direct current;
Supplied gas the time in advance by the heat exchanger tube outer wall of welding and inwall: 3.5S, stagnantly after stopping arc to supply gas the time: 5S;
Welding current: base value: 40A, base value time: 0.1S, peak value: 110A, time to peak: 0.1S;
Down slope time: 5S;
Argon flow amount: weld seam side 10 ~ 12L/min, welded pipe inwall side: 8 ~ 10L/min;
Welding current starts attenuating position: 365 °;
Welding gun rotates speed and ensures that speed of welding is: 200 ~ 260mm/min;
Tungsten electrode type and diameter: cerium tungsten electrode, diameter of phi 2.5mm; Nozzle diameter Φ 8mm.
Tube sheet automatic welding machine comprises nozzle, the locator in heat exchanger tube and gas hood can be stretched into, cerium tungsten electrode is set in nozzle, locator comprises the water cooling tube be fixedly connected with the head of bonding machine, in water cooling tube, circulating water channel is set, be connected with water circulating pump by water pipe, the other end of water cooling tube is connected with termination, location, termination, location is by being connected with water cooling tube an air inlet communicating pipe, the end of termination, location is sub-air chamber, air inlet pipe in straight-through sub-air chamber was set in air inlet communicating pipe, air inlet communicating pipe sidewall air inlet is set, this air inlet connects inlet duct by high temperature resistant tracheae, sub-air chamber's surrounding arranges multiple venthole, this venthole and air inlet pipe conducting.
Further, the angle between the central shaft of nozzle and the central shaft of locator is 10 ~ 20 °.
Further, heat exchanger tube outer wall is to pore span from between 0.1 ~ 0.15 millimeter.
The present invention compared with prior art; beneficial effect is: the welding method of the present invention of employing and the welding gun adopted; realize the two-sided gas shield of inside pipe wall and outer wall, in welding process, welding and the inside and outside gas of pipe realize synchronous; and saving gas; be not easy during welding to occur oxidation, due to adopted welding method, 0.8 millimeter and the welding of following heat exchanger tube can be realized; the fusion of exchanger tubes and tubesheets postwelding is good, suppresses and is not easy to reveal.
Accompanying drawing explanation
Fig. 1 is the placement location structural representation of the welding gun that the embodiment of the present invention provides;
Fig. 2 is the structural representation of the welding gun that the embodiment of the present invention provides.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The method adopts following step:
1) on tube sheet 1 hole, pour out 1X35 ° of chamfering in the one end in hole, the size of holing and heat exchanger tube 2 supporting;
2) first exchange heat pipe 2 termination before assembling and carry out acid solution cleaning, remove oxide, then with clear water, acid solution is cleaned, until expose silvery white metallic luster;
3) heat exchanger tube 2 and tube sheet 1 are assembled, and together with being first assembled into heat exchanger tube 2 by a tube sheet 1, tube sheet 1 one end frock is fixed, and guaranteeing that heat exchanger tube 2 stretches out tubesheet strength is 1.5 millimeters, and heat exchanger tube 2 outer wall is to pore span from being 0.15 millimeter;
4) exchanger tubes and tubesheets welding
As shown in Figure 1, tube sheet automatic welding machine is adopted, heat exchanger tube outer wall and the two-sided argon shield of inwall; Purity of argon 99.999% high-purity argon, welding gun and workpiece fit tightly, all-position welding; The welding parameter that tube sheet automatic welding machine adopts is: adopt pulse frequency to be no more than 0.2 second;
Welding parameter: tube head from melting welding, straight polarity direct current;
Supplied gas the time in advance by the heat exchanger tube outer wall of welding and inwall: 3.5S, stagnantly after stopping arc to supply gas the time: 5S;
Welding current: base value: 40A, base value time: 0.1S, peak value: 110A, time to peak: 0.1S;
Down slope time: 5S, welding gun rotary speed is set as: 320 ‰;
Argon flow amount: weld seam side 10 ~ 12L/min, welded pipe inwall side: 8 ~ 10L/min;
Welding current starts attenuating position: 365 °;
Speed of welding: 229mm/min;
Tungsten electrode type and diameter: cerium tungsten electrode, diameter of phi 2.5mm; Nozzle diameter Φ 8mm.
As illustrated in fig. 1 and 2, tube sheet automatic welding machine comprises nozzle 4, the locator 6 in heat exchanger tube 2 and gas hood 3 can be stretched into, cerium tungsten electrode 5 is set in nozzle 4, angle between the central shaft of nozzle 4 and the central shaft of locator 6 is 10 ~ 20 °, locator 6 comprises the water cooling tube 61 be fixedly connected with the head of bonding machine, connected mode is for being threaded, circulating water channel 64 is set in water cooling tube 61, be connected with water circulating pump by water pipe, the other end of water cooling tube 61 is connected with termination, location, termination, location was connected with water cooling tube 61 by the air inlet communicating pipe 62 of one end, the end of termination, location is sub-air chamber 63, air inlet pipe 65 in straight-through sub-air chamber 63 was set in air inlet communicating pipe 62, air inlet communicating pipe 62 sidewall air inlet 66 is set, this air inlet 66 connects inlet duct by high temperature resistant tracheae, sub-air chamber 63 surrounding arranges multiple venthole 67, this venthole and air inlet pipe conducting.
During welding, locator is stretched in pipe, regulate charge flow rate, in heat exchanger tube outer wall and inwall, carry out gas shielded simultaneously.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (3)

1. a welding method for titanium ultra-thin tube, is characterized in that, comprises following step:
1) tube sheet is holed, pours out 1X35 ° of chamfering in the one end in hole, the size of holing and heat exchanger tube supporting;
2) before assembling, first heat exchanging pipe end carries out acid solution cleaning, removes oxide, then acid solution is cleaned with clear water, until expose silvery white metallic luster;
3) exchanger tubes and tubesheets assembling, together with first being installed to set of heat exchange tubes by a tube sheet, tube sheet one end frock is fixed, and guaranteeing that heat exchanger tube stretches out tubesheet strength is 1 ~ 2 millimeter, and heat exchanger tube outer wall is to pore span from being no more than 0.15 millimeter;
4) exchanger tubes and tubesheets welding:
Adopt tube sheet automatic welding machine, heat exchanger tube outer wall and the two-sided argon shield of inwall; Purity of argon 99.999%, welding gun and workpiece fit tightly, all-position welding; The welding parameter that tube sheet automatic welding machine adopts is: adopt pulse frequency to be no more than 0.2 second;
Welding parameter: tube head from melting welding, straight polarity direct current;
Supplied gas the time in advance by the heat exchanger tube outer wall of welding and inwall: 3.5S, stagnantly after stopping arc to supply gas the time: 5S;
Welding current: base value: 40A, base value time: 0.1S, peak value: 110A, time to peak: 0.1S;
Down slope time: 5S;
Argon flow amount: weld seam side 10 ~ 12L/min, welded pipe inwall side: 8 ~ 10L/min;
Welding current starts attenuating position: 365 °;
Welding gun rotary speed ensures that speed of welding is: 200 ~ 260mm/min;
Tungsten electrode type and diameter: cerium tungsten electrode, diameter of phi 2.5mm; Nozzle diameter Φ 8mm;
Tube sheet automatic welding machine comprises nozzle, the locator in heat exchanger tube and gas hood can be stretched into, cerium tungsten electrode is set in nozzle, locator comprises the water cooling tube be fixedly connected with the head of bonding machine, in water cooling tube, circulating water channel is set, be connected with water circulating pump by water pipe, the other end of water cooling tube is connected with termination, location, termination, location is by being connected with water cooling tube an air inlet communicating pipe, the end of termination, location is sub-air chamber, air inlet pipe in straight-through sub-air chamber was set in air inlet communicating pipe, air inlet communicating pipe sidewall air inlet is set, this air inlet connects inlet duct by high temperature resistant tracheae, sub-air chamber's surrounding arranges multiple venthole, this venthole and air inlet pipe conducting.
2. according to the welding method of titanium ultra-thin tube according to claim 1, it is characterized in that, the angle between the central shaft of nozzle and the central shaft of locator is 10 ~ 20 °.
3. according to the welding method of titanium ultra-thin tube according to claim 1, it is characterized in that, heat exchanger tube outer wall is to pore span from between 0.1 ~ 0.15 millimeter.
CN201410067020.0A 2014-02-26 2014-02-26 A kind of welding method of titanium ultra-thin tube Active CN103817415B (en)

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Application Number Priority Date Filing Date Title
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CN103817415B true CN103817415B (en) 2015-11-25

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CN106180985A (en) * 2015-06-01 2016-12-07 郑州科源耐磨防腐工程有限公司 A kind of titanium plate automatic tungsten anode argon arc welding technique
CN105081538B (en) * 2015-08-25 2017-04-19 哈电集团(秦皇岛)重型装备有限公司 Process for automatically welding small-specification thin-walled tube and small-holed axle tube plate
CN107088698A (en) * 2017-03-10 2017-08-25 鲁西工业装备有限公司 A kind of exchanger tubes and tubesheets automatic welding positioning and cooling device and automatic soldering method
CN107470747B (en) * 2017-08-25 2020-06-23 上海电气核电设备有限公司 Welding process for improving pipe plugging efficiency of steam generator
CN110253115A (en) * 2019-06-21 2019-09-20 隆华科技集团(洛阳)股份有限公司 A kind of welding method for titanium or titanium alloy threaded plug type air cooler tube sheet angle joint
CN110303278B (en) * 2019-07-08 2021-05-25 四川科新机电股份有限公司 Assembly spot welding tool and assembly spot welding method for hole welding in pipe plate
CN112191998A (en) * 2020-08-27 2021-01-08 兴化日成金属制品有限公司 Column type welding process for small workpieces
CN112059372A (en) * 2020-09-10 2020-12-11 张家港市恒强冷却设备有限公司 Welding process for base pipe and pipe plate of thin-wall air cooler
CN112496544A (en) * 2020-09-30 2021-03-16 上海交通大学 Efficient welding method and device for thin-wall welding titanium tube by arc-assisted laser

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EP0727275A1 (en) * 1995-02-18 1996-08-21 BDAG Balcke-Dürr Aktiengesellschaft Method of welding the ends of thin-walled heat exchanger tubes free of residual crevices
JP2003225764A (en) * 2002-02-05 2003-08-12 Ishikawajima Harima Heavy Ind Co Ltd Method and device for welding thin-walled tube to thick plate
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CN203140951U (en) * 2013-02-26 2013-08-21 甘肃蓝科石化高新装备股份有限公司 Gas protection device for all-position tube plate automatic argon arc welding
CN203418217U (en) * 2013-07-29 2014-02-05 张家港化工机械股份有限公司 Heat exchange tube inner wall protecting tool when argon arc welding is carried out on heat exchange tube and tube plate

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
EP0727275A1 (en) * 1995-02-18 1996-08-21 BDAG Balcke-Dürr Aktiengesellschaft Method of welding the ends of thin-walled heat exchanger tubes free of residual crevices
JP2003225764A (en) * 2002-02-05 2003-08-12 Ishikawajima Harima Heavy Ind Co Ltd Method and device for welding thin-walled tube to thick plate
CN102717175A (en) * 2012-06-20 2012-10-10 东方电气集团东方锅炉股份有限公司 Automatic argon arc seal welding method for narrow gap between deep grooves of tube plate and heat exchange tube
CN203140951U (en) * 2013-02-26 2013-08-21 甘肃蓝科石化高新装备股份有限公司 Gas protection device for all-position tube plate automatic argon arc welding
CN203418217U (en) * 2013-07-29 2014-02-05 张家港化工机械股份有限公司 Heat exchange tube inner wall protecting tool when argon arc welding is carried out on heat exchange tube and tube plate

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