CN104148788A - Small-diameter pipe inner wall consumable electrode nickel base alloy anti-corrosion build up welding method - Google Patents
Small-diameter pipe inner wall consumable electrode nickel base alloy anti-corrosion build up welding method Download PDFInfo
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- CN104148788A CN104148788A CN201410451879.1A CN201410451879A CN104148788A CN 104148788 A CN104148788 A CN 104148788A CN 201410451879 A CN201410451879 A CN 201410451879A CN 104148788 A CN104148788 A CN 104148788A
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Classifications
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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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
- B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
- B23K9/044—Built-up welding on three-dimensional surfaces
- B23K9/046—Built-up welding on three-dimensional surfaces on surfaces of revolution
- B23K9/048—Built-up welding on three-dimensional surfaces on surfaces of revolution on cylindrical surfaces
Abstract
The invention discloses a small-diameter pipe inner wall consumable electrode nickel base alloy anti-corrosion build up welding method which is used for solving the problem that welding quality is poor due to the fact that an existing small-diameter pipe inner wall anti-corrosion build up welding connector is too hot. In the welding process through the method, two weld layers are welded, and the method is characterized in that in the first weld layer, welding current is 110-120A, welding voltage is 25-30V, and welding speed is 25-30 cm/min; in the second weld layer, welding current is 100-110A, welding voltage is 23-25V, and welding speed is 25-30 cm/min. By means of the method, a welding connector is prevented being too hot, so that thick columnar grains are avoided, welding strength is improved, cracks are avoided, and welding quality is improved.
Description
Technical field
The present invention relates to welding field, be specifically related to the anti-corrosion overlaying method of a kind of small-bore pipe fitting inwall consumable electrode nickel-base alloy.
Background technology
Flourish along with oil cause, and the carrying out of China's oil strategic reserves engineering.Duration of a project requires tight, working environment harshness in device, and built-up welding that pipe fitting inner wall is anti-corrosion requires more and more higher, and the demand in each engineering is also increasing, the most important thing is the directly quality requirement of the whole engineering of impact of quality of welding quality.
For small-bore pipe fitting, due to the restrictive condition of its caliber, so can only adopt open arc overlaying method, gas metal-arc welding (GMAW) and two kinds of duct butt-welding method of non-consumable gas shielded arc welding (GTAW).
Nickel and nickel-base alloy have unique physics, chemistry and corrosion resisting property, all have good mechanical property under high temperature and low temperature simultaneously, and therefore nickel and nickel-base alloy are used widely in many fields such as chemistry, oil, space flight, navigation and atomic energy.
But, in the process of built-up welding due to nickel and nickel-base alloy weld metal surface tension large, poor fluidity, viscosity are difficult for being greatly shaped and easily produce oxidation and causes poor welding quality, and the weld seam being shaped is generally convex, for small-bore pipe fitting, the weld seam of convex is the use that affects pipe fitting, even can not use.
In addition, due to nickel and nickel-base alloy poor thermal conductivity, existing welding procedure easily makes welding point overheated, produce thick columnar grain, on thick column border, concentrated low-melting-point eutectic, their intensity is low, fragility is large, is easy to form crackle, thereby causes poor welding quality under the effect of welding stress.
Summary of the invention
The present invention is for solving the problems of the technologies described above, and provides a kind of small-bore pipe fitting inwall consumable electrode nickel-base alloy anti-corrosion overlaying method, can prevent that welding point is overheated, thereby prevent thick columnar grain, the intensity that improves welding, prevents the generation of crackle, thereby improves the quality of welding.
Meanwhile, can change the mobility of welding pool, can change Nickel-based Alloy Welding molten bath mobility, prevent that welding bead is oxidized, ensure the chemical composition of layer, thereby improve the quality of welding, weld seam can not protrude simultaneously, can meet the welding requirements of small-bore pipe fitting.
For addressing the above problem, the technical solution adopted in the present invention is:
The anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy, it is characterized in that, in welding process, every one weld seam has two-layer layer, and welding current when ground floor layer is 110-120A, weldingvoltage is 25-30V, and speed of welding is 25-30 cm/min; Welding current when second layer layer is 100-110A, and weldingvoltage is 23-25V, and speed of welding is 25-30 cm/min.
After ground floor layer has welded, temperature is cooled to 90 degree left and right and carries out the welding of second layer layer again, thereby avoids the too high problem of interlayer temperature.
In welding process, adopt protective gas to protect, the component of protective gas and the percent by volume of component are:
Argon gas 90-95%,
Helium 5-10%.
The percent by volume of described argon gas is 95%, and the percent by volume of described helium is 5%.
In welding process, the gas flow of argon gas is 20-25 L/min.
In welding process, the gas flow of argon gas is 20 L/min.
In welding process, nickel-base alloy is ERNiCrMo-3, is nickel-base alloy bare welding filler metal SNi6625.
Compared with prior art, the present invention has following beneficial effect:
The anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy of the present invention, can prevent that welding point is overheated, thereby prevents thick columnar grain, improves the intensity of welding, prevents the generation of crackle, ensures the quality of welding fabrication and weld seam.
In welding process of the present invention; the protective gas that adopts the helium of the argon gas that is 90-95% by percent by volume and 5-10% to form welds; can change welding pool mobility, prevent that welding bead is oxidized, ensure the chemical composition of layer, thereby improve the quality of welding.Make weld seam can not protrude simultaneously, keep the level and smooth of welding bead and tube wall, can meet the welding requirements of small-bore pipe fitting.Viscosity and the surface tension of Ni-based liquid metals are larger, and poor fluidity, under the air blast effect of protective gas, has improved the mobility of metal, and appearance of weld is good.Argon gas and helium are very strong inert gases, have prevented the chemical reaction of liquid nickel based metal and air simultaneously, have prevented oxidation.
Meanwhile, in the process of welding, the gas flow of argon gas is controlled at 20-25L/min can open good protective effect.If gas flow is less than 20 L/min, can not reach the effect of protection, outward appearance moulding is poor; If gas flow is greater than 25 L/min, cost of goods manufactured increases, inadvisable.
Nickel-base alloy of the present invention is ERNiCrMo-3, and this material, in severe corrosive environment, has wider temperature range, and has good opposing pitting corrosion and the ability of crevice corrosion.Thereby raising corrosion resistance, the service life of improving pipe fitting.
Brief description of the drawings
Fig. 1 is that the present invention welds welding schematic diagram later;
Fig. 2 does not adopt the present invention to weld welding schematic diagram later.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, and described embodiment is only the present invention's part embodiment, is not whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiment used that obtain under creative work prerequisite, belongs to protection scope of the present invention.
The anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy of the present invention, in welding process, every one weld seam has two-layer layer, and welding current when ground floor layer is 110-120A, and weldingvoltage is 25-30V, and speed of welding is 25-30 cm/min; Welding current when second layer layer is 100-110A, and weldingvoltage is 23-25V, and speed of welding is 25-30 cm/min.
Before welding, workpiece is cleared up, ensure the clean of weldment surface, be to obtain essential condition of the good overlay cladding of nickel-base alloy.On surface of the work, often there are one deck grease, dirt and oxide etc., can adopt the PROCESS FOR TREATMENT such as machining and Chemical cleaning.
Also need workpiece to carry out the pre-heat treatment, the temperature of preheating is 90-100 DEG C simultaneously.Nickel-base alloy poor fluidity, in order to avoid cause overlay cladding surface forming poor.
Simultaneously, carry out welding in welding process time, take short arc, fast welding, should control interlayer temperature and be controlled at 90 ° of left and right, be no more than 100 DEG C, heat input is as much as possible little, when ground floor layer, heat input is controlled at below 8.6kj/cm, and when second layer layer, heat input is controlled at below 6.6kj/cm.The poor fluidity of liquid state of molten pool metal when Nickel-based Alloy Welding, fusion penetration is shallow, prevent the generation of pore, the defect such as lack of penetration.
The anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy of the present invention, can prevent that welding point is overheated, thereby prevents thick columnar grain, improves the intensity of welding, prevents the generation of crackle, ensures the quality of welding fabrication and weld seam.
In welding process, adopt protective gas to protect, the component of protective gas and the percent by volume of component are:
Argon gas 90-95%,
Helium 5-10%.
In welding process of the present invention, the hybrid protection gas of selection argon gas and helium can change the mobility of welding pool, prevent that welding bead is oxidized, ensures the chemical composition of layer, thereby improves the quality of welding.Make weld seam can not protrude simultaneously, keep the level and smooth of welding bead and tube wall, can meet the welding requirements of small-bore pipe fitting.
Viscosity and the surface tension of Ni-based liquid metals are larger, and poor fluidity, under the air blast effect of protective gas, has improved the mobility of metal, and appearance of weld is good.Argon gas and helium are very strong inert gases, have prevented the chemical reaction of liquid nickel based metal and air simultaneously, have prevented oxidation.
As the preferred mode of one, the percent by volume of argon gas is 95%, and the percent by volume of described helium is 5%.
In welding process, the gas flow of argon gas is 20-25 L/min.
In welding process, the gas flow of argon gas is 20 L/min.
In welding process, the gas flow of argon gas is 20-25 L/min, if gas flow is less than 20 L/min, can not reach the effect of protection, and outward appearance moulding is poor; If gas flow is greater than 25 L/min, cost of goods manufactured increases, inadvisable.
As a kind of preferred mode of the present invention, in welding process, the gas flow of argon gas is 20 L/min.Can either meet the outward appearance technological requirement of welding, simultaneously also can be cost-saving.
In welding process, nickel-base alloy is ERNiCrMo-3, is nickel-base alloy bare welding filler metal SNi6625; This material, in severe corrosive environment, has wider temperature range, and has good opposing pitting corrosion and the ability of crevice corrosion.Thereby raising corrosion resistance, the service life of improving pipe fitting.
Embodiment mono-
The anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy of the present embodiment, in welding process, every one weld seam has two-layer layer, and welding current when ground floor layer is 110A, and weldingvoltage is 30V, and speed of welding is 25 cm/min; Welding current when second layer layer is 110A, and weldingvoltage is 23V, and speed of welding is 25 cm/min.The present embodiment welding weld seam schematic diagram later as shown in Figure 1.
Embodiment bis-
The anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy of the present embodiment, in welding process, every one weld seam has two-layer layer, and welding current when ground floor layer is 120A, and weldingvoltage is 25V, and speed of welding is 30 cm/min; Welding current when second layer layer is 100A, and weldingvoltage is 25V, and speed of welding is 30cm/min.The present embodiment welding weld seam schematic diagram later as shown in Figure 1.
Embodiment tri-
The anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy of the present embodiment, in welding process, every one weld seam has two-layer layer, and welding current when ground floor layer is 115A, and weldingvoltage is 28V, and speed of welding is 26 cm/min; Welding current when second layer layer is 105A, and weldingvoltage is 24V, and speed of welding is 27cm/min.The present embodiment welding weld seam schematic diagram later as shown in Figure 1.
Embodiment tetra-
The anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy of the present embodiment, in welding process, every one weld seam has two-layer layer, and welding current when ground floor layer is 118A, and weldingvoltage is 26V, and speed of welding is 29cm/min; Welding current when second layer layer is 107A, and weldingvoltage is 23.5V, and speed of welding is 28cm/min.The present embodiment welding weld seam schematic diagram later as shown in Figure 1.
Embodiment five
The anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy of the present embodiment, in welding process, every one weld seam has two-layer layer, and welding current when ground floor layer is 120A, and weldingvoltage is 30V, and speed of welding is 30cm/min; Welding current when second layer layer is 110A, and weldingvoltage is 25V, and speed of welding is 30cm/min.The present embodiment welding weld seam schematic diagram later as shown in Figure 1.
Embodiment six
The anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy of the present embodiment, in welding process, every one weld seam has two-layer layer, and welding current when ground floor layer is 110A, and weldingvoltage is 25V, and speed of welding is 25cm/min; Welding current when second layer layer is 100A, and weldingvoltage is 23V, and speed of welding is 25cm/min.The present embodiment welding weld seam schematic diagram later as shown in Figure 1.
Embodiment eight
The anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy of the present embodiment, in welding process, every one weld seam has two-layer layer, and welding current when ground floor layer is 112A, and weldingvoltage is 26V, and speed of welding is 27 cm/min; Welding current when second layer layer is 101A, and weldingvoltage is 24V, and speed of welding is 28 cm/min.In welding process, the protective gas that adopts the helium of the argon gas that is 90% by percent by volume and 10% to form is protected.As shown in Figure 1, the gas flow that keeps argon gas when welding is 20-25 L/min to the present embodiment welding weld seam schematic diagram later.Can find out from outward appearance, even weld, level and smooth, adopts the protective gas of this component composition to weld, and the appearance effect of welding is all right, meets technological requirement.
Weld laggard line bend test, the table of crooked test is as shown in the table:
Anti-corrosion built-up welding deposited metal composition (%) is analyzed, analysis result is as shown in the table again:
Can find out from tabular analysis, the metallochemistry composition after welding, can reach actual needs requirement.
Embodiment nine
The anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy of the present embodiment, in welding process, every one weld seam has two-layer layer, and welding current when ground floor layer is 119A, and weldingvoltage is 26V, and speed of welding is 26 cm/min; Welding current when second layer layer is 102A, and weldingvoltage is 23.5V, and speed of welding is 29 cm/min.In welding process, the protective gas that adopts the helium of the argon gas that is 95% by percent by volume and 5% to form is protected.As shown in Figure 1, the gas flow that keeps argon gas when welding is 20-25 L/min to the present embodiment welding weld seam schematic diagram later.The even weld of the present embodiment, level and smooth, adopts the protective gas of this component composition to weld, and the appearance effect of welding is all right, meets technological requirement.
Embodiment ten
The anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy of the present embodiment, in welding process, every one weld seam has two-layer layer, and welding current when ground floor layer is 112A, and weldingvoltage is 26V, and speed of welding is 27 cm/min; Welding current when second layer layer is 101A, and weldingvoltage is 24V, and speed of welding is 28 cm/min.In welding process, the protective gas that adopts the helium of the argon gas that is 80% by percent by volume and 20% to form is protected.When welding, keeping the gas flow of argon gas is 20-25 L/min.As shown in Figure 2, the outward appearance of welding is poor for the present embodiment welding weld seam schematic diagram later, and weld seam protrudes, and can not meet technological requirement.
Weld laggard line bend test, the table of crooked test is as shown in the table:
Crooked test meets technological requirement.
After welding, then carry out metallochemistry composition (%) analysis, analysis result is as shown in the table:
As can be seen from the table, the metallochemistry constituent analysis after the present embodiment welding can not reach actual needs requirement, can not meet process conditions.
Embodiment 11
The anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy of the present embodiment, in welding process, every one weld seam has two-layer layer, and welding current when ground floor layer is 112A, and weldingvoltage is 26V, and speed of welding is 27 cm/min; Welding current when second layer layer is 101A, and weldingvoltage is 24V, and speed of welding is 28 cm/min.In welding process, the protective gas that adopts the helium of the argon gas that is 99% by percent by volume and 1% to form is protected.When welding, keeping the gas flow of argon gas is 20-25 L/min.As shown in Figure 2, the outward appearance of welding is poor for the present embodiment welding weld seam schematic diagram later, and weld seam protrudes, and can not meet technological requirement.
Weld laggard line bend test, the table of crooked test is as shown in the table:
Crooked test meets technological requirement.
After welding, then carry out metallochemistry composition (%) analysis, analysis result is as shown in the table:
Can not reach actual needs requirement.
Embodiment 12
The ground floor layer welding current of the present embodiment is not 110-120A, and weldingvoltage is not at 25-30V, and speed of welding is not in 25-30cm/min, and the design sketch of welding as shown in Figure 2, can not meet process conditions.
Embodiment 12
The present embodiment second layer layer welding welding current is at 100-110A, weldingvoltage not in 23-30V second layer layer speed of welding not in 25-30cm/min, the design sketch of welding as shown in Figure 2, can not meet technique.
Claims (5)
1. the anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy, it is characterized in that, in welding process, every one weld seam has two-layer layer, and welding current when ground floor layer is 110-120A, weldingvoltage is 25-30V, and speed of welding is 25-30 cm/min; Welding current when second layer layer is 100-110A, and weldingvoltage is 23-25V, and speed of welding is 25-30 cm/min.
2. the anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy according to claim 1, is characterized in that, in welding process, adopts protective gas to protect, and the component of protective gas and the percent by volume of component are:
Argon gas 90-95%,
Helium 5-10%.
3. the anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy according to claim 2, is characterized in that, the percent by volume of described argon gas is 95%, and the percent by volume of described helium is 5%.
4. according to the anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy described in claim 2 or 3, it is characterized in that, in welding process, the gas flow of argon gas is 20-25 L/min.
5. the anti-corrosion overlaying method of small-bore pipe fitting inwall consumable electrode nickel-base alloy according to claim 4, is characterized in that, in welding process, the gas flow of argon gas is 20 L/min.
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| CN201410451879.1A CN104148788A (en) | 2014-09-05 | 2014-09-05 | Small-diameter pipe inner wall consumable electrode nickel base alloy anti-corrosion build up welding method |
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| CN201410451879.1A CN104148788A (en) | 2014-09-05 | 2014-09-05 | Small-diameter pipe inner wall consumable electrode nickel base alloy anti-corrosion build up welding method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109396612A (en) * | 2018-12-10 | 2019-03-01 | 中石化第十建设有限公司 | A kind of UNS N08825 nickel-base material pipeline solid core welding wire consumable electrode pulse MIG welding procedure |
| CN110125515A (en) * | 2019-04-24 | 2019-08-16 | 武汉船用机械有限责任公司 | Nickel alloy overlaying method |
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| CN103111722A (en) * | 2013-02-21 | 2013-05-22 | 上海电气核电设备有限公司 | Method for welding tubes with tube sheets under protection action of mixed gas |
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| JP2004009077A (en) * | 2002-06-04 | 2004-01-15 | Daido Steel Co Ltd | Metallic composite pipe and its production method |
| JP2006320909A (en) * | 2005-05-17 | 2006-11-30 | Daido Steel Co Ltd | Heat resistant multilayer metal tube |
| CN101402152A (en) * | 2008-08-05 | 2009-04-08 | 烟台国冶冶金水冷设备有限公司 | Steel-smelting revolving furnace smoke canal weld deposit process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109396612A (en) * | 2018-12-10 | 2019-03-01 | 中石化第十建设有限公司 | A kind of UNS N08825 nickel-base material pipeline solid core welding wire consumable electrode pulse MIG welding procedure |
| CN110125515A (en) * | 2019-04-24 | 2019-08-16 | 武汉船用机械有限责任公司 | Nickel alloy overlaying method |
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Application publication date: 20141119 |