CN102091852A - Method for welding copper nickel pipe - Google Patents
Method for welding copper nickel pipe Download PDFInfo
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- CN102091852A CN102091852A CN 201110002053 CN201110002053A CN102091852A CN 102091852 A CN102091852 A CN 102091852A CN 201110002053 CN201110002053 CN 201110002053 CN 201110002053 A CN201110002053 A CN 201110002053A CN 102091852 A CN102091852 A CN 102091852A
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Abstract
The invention discloses a method for welding a copper nickel pipe, and belongs to the technical field of welding. The welding method is characterized by comprising the following steps of: welding a point positioning seam at trisection positions along the circumference direction by adopting tungsten electrode argon protection welding respectively, obliquely fixing the copper nickel pipe for 45 degrees, performing vertical upward welding by adopting a back gas protection device, sealing the butted seams by using sealing strips, performing multilayer multi-way welding during priming the seams and filling the seams, monitoring the interlayer temperature of the seams not to exceed 150 DEG C, controlling heat input within 1.5kJ/mm, and finally, checking the quality of the seams. The method does not need to preheat the seams, improves the working environment, lightens the labor intensity, and realizes preheating-free single-side welding and double-side formation of the butted seams of the thin-wall copper nickel pipe or thin sheets; the quality of the seams accords with the requirement of national standard quality; and the method improves the strength of the seams, does not reduce the plasticity of the seams, and improves the thermal cracking resistance of the seams and the mechanical property at the joint.
Description
Technical field
The invention belongs to welding technology field, specifically a kind of welding method of copper nickel pipe.
Background technology
At present, there is a difficult problem in the corronil welding, is the thermal conductivity height of copper, and the mother metal heat radiation is too fast, be difficult to fusion with the filling metal, mother metal thickness and size are big more, and it is serious more to dispel the heat, and also difficulty reaches fusion temperature, when welding, must get weld preheating, in welding process, also need heating synchronously.In order to reach good welding effect, must keep the temperature of workpiece, labor strength is big, and execution conditions are abominable, and it is very big to splash, and can not guarantee weldquality, and it is big mainly to show as the mother metal performance loss, and the welding position mechanical performance seriously descends.The surface tension of copper when molten state is littler than carbon steel, mobile bigger than steel, so surface forming ability, can't realize single face welding and double face shaping according to present welding method at all, at postwelding moderate finite deformation and stress appear generally, add the existence of other impurity, the possibility of welding point hot tearing is big.
Corronil welding prior art: according to the content of present standard GB/T11618-1999 " copper pipe joint " and shipbuilding industry standard C B/T3790-1997 " boats and ships pipe process technology condition ", the copper nickel pipe of wall thickness δ＜6 millimeter can adopt spigot-type pipe fitting and banjo fixing butt jointing, welding method is gas brazing, adopt the method soldering copper nickel pipe of gas brazing, the shortcoming that exists has: indissoluble closes, yielding, easily produce fire check, easily produce pore and the outward appearance moulding is poor.For the heavy wall copper nickel pipe of wall thickness δ 〉=6 millimeter, GB and rower all provide against the employing soldering, must adopt the molten soldering method welding of electric arc, but GB and rower all do not provide exercisable technology.
Domestic known thin-walled copper nickel pipe arc fusion welding technology all is to use manual arc soldering method and melt pole electrical arc soldering method basically at present, adopt copper-nickel welding rod or copper nickel bare welding filter metal as packing material, need preheating during welding, the welding condition very severe, efficiency is low, welding quality is not to guarantee that the loss of mother metal mechanical performance is big, and adopts above-mentioned welding method can't realize copper nickel pipe butt weld one side welding with back formation.
Learn according to retrieval, " Hebei power technology " first phase in 1994 has disclosed one piece of argon-are welding technology about copper tube, the author is the Deng Zigang that second engineering company is built in the Hebei power saving, this article is to the contrast from welding procedure of the argon-are welding technology of thin-walled copper tube, and the preparation before the welding is to the requirement of welding material, welding procedure has been done detailed description, but this process finds that through our practical operation it is unsuitable for the counterpart welding of 4 millimeters≤δ of wall thickness 〉=8 millimeters copper tubes.
Summary of the invention
The technical problem to be solved in the present invention, provide and a kind ofly need not preheating, one side welding with back formation, welding process and do not have hot tearing, weld seam and can satisfy visual examination, penetration inspection, radioscopy, tension test and macroscopic view and detect, guarantee mother metal and welding point mechanical performance, high-quality, alleviate labor intensity, improve not preheating of the thin-walled copper nickel pipe butt weld one side welding with back formation welding method of execution conditions.
Concrete technical scheme:
A kind of welding method of copper nickel pipe, it comprises that the selecting for use of material selection, welding method and wlding, welding procedure and welding quality detect four partial contents, wherein welding procedure comprises step as described below:
1, groove processing: adopt mechanical means processing to make copper nickel pipe bevel for welding;
2, groove polishing cleaning: strict oxide skin, oil, rust, water and other dirt of removing in the 20 millimeters scopes in weld seam both sides before the weldering, and use the acetone wiped clean, guarantee that the weld zone totally cleans;
3, tack weld: adopt gas tungsten arc welding, 1 millimeter of copper nickel pipe welding point root root face, 2 millimeters of root gaps, tack weld respectively welds place's tack weld along copper nickel pipe circumferential direction position of halving, do not want root of weld portion during tack welding, when formally being welded to anchor point, grind off tack weld with emery wheel;
4, welding position: two bronze medal nickel pipes tilt to fix 45 °, do not rotate during welding, and welding direction is taked upright upwards weldering;
5, back protection: the back protective device is arranged in the copper nickel pipe joint two bronze medal nickel pipes (1), two ends seal (6) with sponge or the middle glued board that accompanies sponge, the also available material that other is fit to, one end is provided with air admission hole (7), be connected with Ar gas appendix (3), an end is provided with venthole (4); The weld seam of two pipe joints seals with sealing strip (5), can be divided into 4 parts to whole welding line and weld, and welds about 1/4 all circles at every turn;
6, backing weld seam: adopt gas tungsten arc welding, when backing weld seam is carried out in preparation, logical Ar of a few minutes enters in the protection of back at first in advance, must continuously fill highly purified argon gas with the air in the complete drain, after finishing fully, welding stops the logical Ar protection at back again, then the round sealing strip (5) of 1/4 week of preparing welding is torn, welding feels secure;
7, fill weld seam: adopt gas tungsten arc welding, cooperate the welding of corronil welding wire to fill weld seam, carrying out multi-pass welding connects, weld maximum weld width and be no more than 10 millimeters, layer is too not thick, the polishing of stainless steel wire brush is adopted in the interlayer cleaning, measures monitoring weld seam interlayer temperature with the numerical digit thermometer in the process of filling weld seam, can not surpass 150 degree;
8, weld inspection: it comprises that visual examination, penetration inspection, radiological survey X, tension test, bend test and macroscopic view detect the inspection content of six parts.
Visual examination, appearance of weld is attractive in appearance, does not find weld defect, and weld width is even, and joint is excessively good, and face of weld is higher than mother metal, and reinforcement is between the 0-1.5 millimeter;
Penetration inspection, butt welded seam permeates detection, and defective is not found on face of weld and nearly surface;
Radiological survey X carries out the X-ray inspection of taking pictures to the whole piece weld seam of pipe fitting, does not find any internal flaw;
Tension test, the tensile strength of detection weld seam;
Bend test, the flexibility of detection welding line joint;
Macroscopic view detects, the polishing of pipe fitting section, and aggressive agent presents clear cross section after corroding, and fills metal and mother metal and merges flawless fully.
The bevel for welding of described copper nickel pipe, joint adopts the single face V-butt, and bevel angle is 60 °;
The gas tungsten arc welding that described tack weld, backing weld seam and filling weld seam all adopt is argon tungsten-arc welding, adopts Ar (〉=99.99%) to protect shield gas flow rate 10-20L/min during welding;
In the described backing weld seam welding process, back protection domestic demand is continuously filled highly purified argon shield, and its purity is protected greater than 99.99% straight argon, and the weld seam back is protected by Ar, prevent that root pass is oxidated, the gas flow in the protective device of back is 10-15L/min;
Described corronil welding wire is that corronil is the alloy of CuNi90/10, CuNi70/30, CuNi25/75;
Described not preheating of copper nickel pipe butt weld one side welding with back formation welding method is used for 4 millimeters≤δ 〉=8 millimeter thin wall shape copper nickel material welding.
In the welding process of described tack weld, backing weld seam and filling weld seam, strict control welding temperature reduces the quantity of welding point as far as possible, and adopts less weld seam heat input, and hot input should be controlled in the 1.5KJ/MM.
This method need not the weld seam preheating, improved working environment, alleviated labour intensity, thin-walled copper nickel pipeline or not preheating of light sheet butt weld one side welding with back formation have been realized, weldquality meets the requirement of GB quality, improve weld strength, but do not reduced plastic property of weld bead, improved the mechanical performance of weld seam heat crack resistance and joint.
Description of drawings
Fig. 1 is the joint design schematic diagram;
Fig. 2 is the welding position schematic diagram;
Fig. 3 is a back protective device schematic diagram;
The 1st, copper nickel pipe, 2 is groove, 3 is appendix, the 4th, venthole, 5 is sealing strip, and 6 is sealing block, and 7 is air admission hole.
The specific embodiment
A kind of welding method of copper nickel pipe; be to adopt the direct current source of welding current; reversal connection; its power output is greater than 80A; simultaneously with the argon tungsten-arc welding of pure argon as protective gas; be because argon tungsten-arc welding arc length and arc stability are fine; concentration of energy can reduce distortion, protects effective; the heat affected area is narrow; characteristics such as flexible operation relatively are fit to the pipeline welding of thin plate and full position, are the thoriated tungsten electrode of 2.4 millimeters of Φ so tungsten electrode adopts the EWTH-2 diameter; nozzle bore is 12.5 millimeters, and tungsten electrode stretches out nozzle length between 6 millimeters-8 millimeters.Utilize the molten fully admittedly principle of copper nickel, adopt intensity, plasticity, alloy solution surface tension good comprehensive properties corronil welding wire, again according to matching principles such as wlding composition and mechanical properties, select the corronil wlding, therefore the wlding of selecting is that the tungsten argon arc welding wire trade mark is UTPA387, specification Φ 2.00, operative norm AWS A5.7 ERCuNi, improve liquid weld metal surface tension, reduce the flowability of liquid weld metal, thereby improve the appearance of weld ability, strengthened weld metal by in wlding, dosing nickel, and resistance to corrosion, particularly anti-brine corrosion have been improved.In the welding process of tack weld, backing weld seam and filling weld seam, strict control welding temperature reduces the quantity of welding point as far as possible, and takes less sweating heat input, and hot input should be controlled in the 1.5KJ/MM.
Embodiment:
A kind of welding method of copper nickel pipe comprises the steps:
1, adopt machining to make the bevel for welding (2) of copper nickel pipe, bevel for welding (2) is 60 ° for single face V-butt groove (2) angle, sees Fig. 1;
2, strict oxide skin, oil, rust, water and other dirt of removing in the 20 millimeters scopes in weld seam both sides before the weldering, and use the acetone wiped clean, guarantee that the weld zone totally cleans;
3, adopt argon tungsten-arc welding, hot input should be controlled in the 1.5KJ/MM, does not dose welding wire and does fusion welding, and tack welding respectively welds place's tack welding along copper nickel pipe circumferential direction trisection posistion, promptly along even tack welding 3 points of circumference, does not want root of weld portion during tack welding;
4, two copper nickel pipes (1) to be welded are tilted to fix 45 °, do not rotate during welding, welding direction is taked upright upwards weldering, sees Fig. 2;
5, through after 3 and 4 the operation, in copper nickel pipe joint two bronze medal nickel pipes (1), two ends seal (6) with sponge or the middle glued board that accompanies sponge, and an end is provided with air admission hole (7) and is connected with Ar gas appendix (3), and an end is provided with venthole (4); The weld seam of two pipe joints seals with sealing strip (5) (sealant tape), sees Fig. 3;
6, adopt argon tungsten-arc welding, hot input should be controlled in the 1.5KJ/MM, when backing weld seam is carried out in preparation, logical Ar of a few minutes enters in 5 devices of making at first in advance, its be purity greater than 99.99% pure argon, must continuously fill purity greater than 99.99% pure argon by the air in the complete drain of venthole, stop the logical Ar at back after welding finishes fully again, then the round sealing strip (5) of 1/4 week of preparing welding is torn, welding feels secure;
7, adopt argon tungsten-arc welding, hot input should be controlled in the 1.5KJ/MM, cooperating the tungsten argon arc welding wire trade mark is UTP A387, weld seam is filled in the welding wire welding of specification Φ 2.00, carries out multi-pass welding and connects, and welds maximum weld width and is no more than 10 millimeters, layer is too not thick, the polishing of stainless steel wire brush is adopted in the interlayer cleaning, measures monitoring weld seam interlayer temperature with the numerical digit thermometer in the process of filling weld seam, can not surpass 150 degree; Welding condition sees Table 1.
Table 1 welding condition
8, by visual examination, it is attractive in appearance to be checked through appearance of weld, and whether weld defect is arranged, and weld width is even, and joint is excessively good, and face of weld is higher than mother metal, and reinforcement is between the 0-1.5 millimeter;
Permeate detection by butt welded seam, whether face of weld and nearly surface defectiveness;
Carry out the X-ray inspection of taking pictures by whole piece weld seam, whether any internal flaw is arranged pipe fitting;
By tension test, the welding point stretch test result sees Table 2
Table 2 welding point stretch test result
By bend test, the welding point bend test the results are shown in Table 3
Table 3 welding point bend test result
Annotate (1): bend test flexual center diameter 4t (t is a sample thickness);
Annotate (2): weld seam has reinforcement, must repair and remove, and makes it to flush with the initial surface of mother metal.
By to the polishing of pipe fitting section, present clear cross section after the aggressive agent erosion, fill metal and mother metal and merge flawless fully.
Claims (4)
1. the welding method of a copper nickel pipe; it comprises that the selecting for use of material selection, welding method and wlding, welding procedure and welding quality detect four partial contents; wherein welding procedure comprises groove processing, groove polishing cleaning, tack weld, welding position, back protection, backing weld seam and filling weld seam, it is characterized in that:
Described tack weld: adopt gas tungsten arc welding, tack weld respectively welds some tack welds along copper nickel pipe circumference direction trisection posistion, does not want root of weld portion during tack welding;
Described welding position: copper nickel pipe joint tilts to fix 45 degree, does not rotate during welding, and welding direction adopts upright upwards weldering;
The protection of described back: the back protective device is arranged in the two bronze medal nickel pipes of copper nickel pipe joint, and two ends seal with sponge or the middle glued board that accompanies sponge, also available material that other is fit to, and an end is provided with an air admission hole, and an end is provided with venthole; The weld seam of two pipe joints seals with sealing strip, can be divided into 4 parts to whole welding line and weld, and welds about 1/4 all circles at every turn;
Described backing weld seam: adopt gas tungsten arc welding, when backing weld seam is carried out in preparation, at first must continuously charge into highly purified argon gas in the back protective device with joint in the copper nickel pipe, then the round sealing strip of 1/4 week of preparing welding be torn, welding feels secure;
Described filling weld seam: adopt gas tungsten arc welding, carry out multi-pass welding and connect, in the process of filling weld seam, measure monitoring weld seam interlayer temperature, can not surpass 150 degree with the numerical digit thermometer.
2. the welding method of a kind of copper nickel pipe according to claim 1; it is characterized in that: the gas tungsten arc welding that described tack weld, backing weld seam and filling weld seam adopt is argon tungsten-arc welding; adopt Ar (〉=99.99%) to protect shield gas flow rate 10-20L/min during welding.
3. the welding method of a kind of copper nickel pipe according to claim 1; it is characterized in that: in the described backing weld seam welding process; back protective device domestic demand is continuously filled highly purified argon shield; its purity is protected greater than 99.99% straight argon, and the gas flow in the protective device of back is 10-15L/min.
4. the welding method of a kind of copper nickel pipe according to claim 1 and 2 is characterized in that: in the welding process of described tack weld, backing weld seam and filling weld seam, hot input should be controlled in the 1.5KJ/MM.
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| CN 201110002053 CN102091852A (en) | 2011-01-07 | 2011-01-07 | Method for welding copper nickel pipe |
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| CN 201110002053 CN102091852A (en) | 2011-01-07 | 2011-01-07 | Method for welding copper nickel pipe |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102310249A (en) * | 2011-06-22 | 2012-01-11 | 中国海洋石油总公司 | Welding method of composite hose stainless steel joint |
| CN103028819A (en) * | 2012-12-12 | 2013-04-10 | 江阴中南重工股份有限公司 | Welding technology for nickel-based alloy weld part |
| CN103317217A (en) * | 2013-03-14 | 2013-09-25 | 上海振华重工(集团)股份有限公司 | Weld pore control method for nickel-copper alloy pipes |
| CN104625349A (en) * | 2014-12-19 | 2015-05-20 | 沈阳富创精密设备有限公司 | Aluminum alloy thin water channel cover plate and thick vacuum cavity water channel welding technology |
| CN109404628A (en) * | 2017-08-16 | 2019-03-01 | 张跃 | A kind of large-scale pipeline structure |
| CN110899912A (en) * | 2019-10-29 | 2020-03-24 | 沪东中华造船(集团)有限公司 | Argon filling method for argon arc welding butt joint of pipelines |
| CN112122864A (en) * | 2020-08-11 | 2020-12-25 | 沪东中华造船(集团)有限公司 | Device and method for emergency welding of oil leakage of marine fuel pipeline |
| CN112719533A (en) * | 2020-12-08 | 2021-04-30 | 山西平阳重工机械有限责任公司 | Welding method of zirconium oxygen-free copper |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102310249A (en) * | 2011-06-22 | 2012-01-11 | 中国海洋石油总公司 | Welding method of composite hose stainless steel joint |
| CN103028819A (en) * | 2012-12-12 | 2013-04-10 | 江阴中南重工股份有限公司 | Welding technology for nickel-based alloy weld part |
| CN103317217A (en) * | 2013-03-14 | 2013-09-25 | 上海振华重工(集团)股份有限公司 | Weld pore control method for nickel-copper alloy pipes |
| CN103317217B (en) * | 2013-03-14 | 2015-08-19 | 上海振华重工(集团)股份有限公司 | Copper-nickel alloy tube weld blowhole control method |
| CN104625349A (en) * | 2014-12-19 | 2015-05-20 | 沈阳富创精密设备有限公司 | Aluminum alloy thin water channel cover plate and thick vacuum cavity water channel welding technology |
| CN109404628A (en) * | 2017-08-16 | 2019-03-01 | 张跃 | A kind of large-scale pipeline structure |
| CN110899912A (en) * | 2019-10-29 | 2020-03-24 | 沪东中华造船(集团)有限公司 | Argon filling method for argon arc welding butt joint of pipelines |
| CN112122864A (en) * | 2020-08-11 | 2020-12-25 | 沪东中华造船(集团)有限公司 | Device and method for emergency welding of oil leakage of marine fuel pipeline |
| CN112719533A (en) * | 2020-12-08 | 2021-04-30 | 山西平阳重工机械有限责任公司 | Welding method of zirconium oxygen-free copper |
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Application publication date: 20110615 |