CN111390350A - Submerged-arc welding method for C-276 composite board - Google Patents
Submerged-arc welding method for C-276 composite board Download PDFInfo
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- CN111390350A CN111390350A CN202010223686.6A CN202010223686A CN111390350A CN 111390350 A CN111390350 A CN 111390350A CN 202010223686 A CN202010223686 A CN 202010223686A CN 111390350 A CN111390350 A CN 111390350A
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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
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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
- B23K9/18—Submerged-arc 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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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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
- B23K9/32—Accessories
Abstract
The invention provides a submerged-arc welding method for a C-276 composite board, and belongs to the technical field of welding processes. The invention determines the optimal welding parameters by optimizing the groove type, selecting proper welding materials and reducing the welding speed, thereby obtaining the remarkable beneficial effects that: the traditional 55-70 degree groove is reduced to 40-44 degrees, the filling amount of welding materials is reduced by about 20 percent, the groove processing and the weld back chipping are carried out by adopting a mechanical mode, the hardening of base materials caused by the rapid heating and the rapid cooling of thermal cutting or carbon arc gouging is effectively avoided, the welding materials of the transition layer are added with Mo element, the compatibility of the weld components of the transition layer and the corrosion resistance of the transition layer are improved, the welding heat input amount of the transition layer and the multi-layer is reduced, the welding stress is reduced, the crack resistance of a welding joint is effectively improved, and the welding joint has good value of practical application.
Description
Technical Field
The invention relates to the technical field of welding processes, in particular to a submerged-arc welding method for a C-276 composite plate, wherein a base layer is made of low alloy steel and the thickness of the base layer is not more than 30 mm.
Background
In recent years, along with the development of manufacturing technology in China, Hastelloy is more and more widely applied to the aspect of Cl ion corrosion resistance. In order to effectively control the cost, the hastelloy composite plate is increasingly applied under the condition of ensuring the corrosion resistance.
The welding of the transition layer in the Hastelloy composite plate belongs to the dissimilar steel phase welding, the welding seam components are complex, and the requirements on interlayer temperature and welding heat input control are strict. Welding is carried out by adopting shielded metal arc welding or even argon arc welding in the prior art, the welding quality has higher dependence on the skill level of an operator, the negative influence of subjective factors such as the reduction of the energy and the physical strength of the operator, the reduction of the responsibility and the like on the welding quality is larger along with the increase of the welding process, and the possibility of generating defects due to operation reasons is higher; the larger the diameter of the equipment is, the larger the welding workload is, and the more obvious the defects of low efficiency and serious interference of human factors of the two methods of shielded metal arc welding and argon arc welding are.
Submerged automatic arc welding is one of the important welding methods in manufacturing pressure vessels, pipe sections, box beams and columns and the like because of its advantages of high welding productivity, stable welding quality, good labor conditions and the like. However, in the process of welding the transition layer of the composite plate, the inventor finds that the submerged automatic arc welding is not easy to control the fusion ratio due to large fusion depth and large heat input amount, and defects are easy to occur in the welding process. Particularly, the traditional hastelloy composite plate transition layer welding adopts a groove with an angle of 55-70 degrees, the welding heat input is large, the hot crack defect is more likely to occur in the welding process, and the base metal has a diluting effect, namely a diluting effect, on the content of welding seam alloy elements in the transition layer welding process, the welded joint is deteriorated, so that the corrosion resistance is reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a submerged arc automatic welding method of a C-276 composite plate with a low alloy steel base layer and a hastelloy composite layer, which can solve the problem of easy generation of hot crack defect in the welding process of the hastelloy transition layer, reduce the filling amount of welding materials, improve the welding efficiency and the corrosion resistance of the hastelloy composite plate, and therefore has good practical application value.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a submerged arc welding method for a C-276 composite board, wherein a base layer of the C-276 composite board is low alloy steel, and a clad layer of the C-276 composite board is Hastelloy, and the submerged arc welding method comprises the following steps:
(1) performing groove machining on a welding part, wherein a single-side V-shaped inner groove is adopted, and the single-side angle of the groove is 20-22 degrees;
(2) cleaning impurities such as oil stains, iron rust and the like on the welding wire, the groove and two sides of the groove to expose metallic luster;
(3) sequentially carrying out secondary shielded welding, submerged automatic welding and welding for bottoming the base layer of the inner opening of the welding seam and filling the base layer;
(4) back gouging the welding seam on the back of the base layer and welding a cover surface layer;
(5) detecting the base layer;
(6) and welding the transition layer and the multiple layers in sequence.
Further, the welding process in the welding method further comprises the following steps:
1) backing and welding a base layer: the welding current is 110-200A, the welding voltage is 22-33V, and the welding speed is 25-35 cm/min;
2) base layer filling and cover surface welding: the welding current is 480-580A, the welding voltage is 28-35V, and the welding speed is 35-45 cm/min;
3) welding a transition layer: the welding current is 220-300A, the welding voltage is 28-32V, and the welding speed is 25-35 cm/min;
4) multilayer welding: the welding current is 240-300A, the welding voltage is 28-32V, and the welding speed is 25-35 cm/min.
The C-276 composite board is a composite board with a base layer made of low alloy steel and a composite layer made of Hastelloy alloy, and further, the thickness of the base layer is not more than 30 mm.
The beneficial effects of one or more technical schemes are as follows:
1. the traditional groove with the angle of 55-70 degrees is reduced to 40-44 degrees, and the filling amount of welding materials is reduced by about 20 percent.
2. The welding heat input of the transition layer and the multiple layers is reduced, the welding stress is reduced, and the crack resistance of the welding joint is effectively improved.
3. The welding material of the transition layer adopts an ERNiCrMo-3 submerged arc welding wire, and the Mo element is added, so that the component compatibility of the welding line of the transition layer and the corrosion resistance of the transition layer are improved, and cracks are avoided.
4. The welding speed is adjusted to 25-35cm/min from the traditional 35-45cm/min, the fusion ratio is reduced on the basis of not reducing the welding current and the voltage, and the components of a welding seam are ensured.
The welding of the C-276 composite board by the submerged arc automatic welding is realized by changing the groove type, selecting proper welding materials, reducing the welding speed and determining the optimal welding parameters, so that the welding time of a transition layer and a composite layer is effectively shortened, the labor intensity of a welder is reduced, the welding efficiency and the corrosion resistance of a welding line are improved, and the method has good practical application value.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings according to the provided drawings without creative efforts.
FIG. 1 is a weld joint and groove form of the present invention;
FIG. 2 is a graph illustrating the amount of filler metal required for each layer of a weld joint according to the present invention;
FIG. 3 shows the form of a bevel 1 in example 1 of the present invention.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As mentioned above, in the welding process of the transition layer of the composite board, the submerged automatic arc welding is not easy to control the fusion ratio due to the large fusion depth and large heat input amount, and defects are easy to occur in the welding process. Particularly, the traditional hastelloy composite plate transition layer welding adopts a groove with an angle of 55-70 degrees, the welding heat input is large, the hot crack defect is more likely to occur in the welding process, and the base metal has a diluting effect, namely a diluting effect, on the content of welding seam alloy elements in the transition layer welding process, the welded joint is deteriorated, so that the corrosion resistance is reduced.
In view of the above, one embodiment of the present invention provides a submerged arc welding method for a C-276 composite panel, comprising the steps of:
(1) performing groove machining on the welding part by adopting a mechanical machining method, wherein a single-side V-shaped inner groove is adopted, and the single-side angle of the groove is 20-22 degrees;
(2) cleaning impurities such as oil stains, iron rust and the like on the welding wire, the groove and two sides of the groove to expose metallic luster;
(3) sequentially carrying out secondary shielded welding, submerged automatic welding and welding for bottoming the base layer of the inner opening of the welding seam and filling the base layer;
(4) back gouging the welding seam on the back of the base layer and welding a cover surface layer;
(5) detecting the base layer;
(6) and welding the transition layer and the multiple layers in sequence.
In another embodiment of the present invention, after the groove is processed in step (1), the penetration detection is performed on the groove to ensure the quality of the combination of the composite layer and the base layer.
In another specific embodiment of the invention, in the step (2), the cleaning areas on both sides of the groove are in the range of 50mm on both sides of the groove, and the silvery white surface of the compound layer is qualified and cannot be blackened.
In another embodiment of the present invention, the welding of the base layer at the inner opening in step (3) is 2 to 4mm lower than the boundary line between the composite layer and the base layer.
In another embodiment of the present invention, the back surface back gouging of the base layer in the step (4) is performed by mechanical gouging.
In another embodiment of the present invention, the step (5) of detecting the substrate uses radiation detection and penetration detection.
In another embodiment of the present invention, in the step (6), the welding of the transition layer is 0.5 to 1.5mm higher than the boundary line between the composite layer and the base layer.
In another embodiment of the present invention, the interlayer temperature during the step (6) of the transition layer and the multilayer welding process should not be higher than 150 ℃ and should not be lower than 60 ℃.
In another embodiment of the present invention, the welding wire in step (2) is an ERNiCrMo-3 submerged arc welding wire with specification
Chemical components: less than or equal to 0.1 percent of C, less than or equal to 0.5 percent of Mn, less than or equal to 5 percent of Fe, less than or equal to 0.02 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.5 percent of Si, less than or equal to 0.5 percent of Cu, more than or equal to 58 percent of Ni, less than or equal to 0.4 percent of Ti, 20-23 percent of Cr, 3.15-4.15 percent of Nb3, less than or. According to the invention, the welding material adopts an ERNiCrMo-3 submerged arc welding wire, and the Mo element is added, so that the component compatibility of a welding seam of the transition layer and the corrosion resistance of the transition layer are improved, and cracks are avoided.
In another embodiment of the present invention, the welding process in the welding method further includes:
1) backing and welding a base layer: the welding current is 110-200A, the welding voltage is 22-33V, and the welding speed is 25-35 cm/min;
2) base layer filling and cover surface welding: the welding current is 480-580A, the welding voltage is 28-35V, and the welding speed is 35-45 cm/min;
3) welding a transition layer: the welding current is 220-300A, the welding voltage is 28-32V, and the welding speed is 25-35 cm/min;
4) multilayer welding: the welding current is 240-300A, the welding voltage is 28-32V, and the welding speed is 25-35 cm/min. By adjusting the traditional welding speed, the fusion ratio is reduced on the basis of not reducing the welding current and the welding voltage, and the components of the welding seam are ensured.
In another embodiment of the present invention, the C-276 composite board is a composite board with a base layer made of low alloy steel and a composite layer made of hastelloy alloy, and further, the thickness of the base layer is not greater than 30 mm.
The invention will be further described with reference to examples of embodiments shown in the drawings. But are not to be construed as limiting the invention. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
In the embodiment of the invention, the welding parameters are shown in the table 1 and are executed in the welding process;
1) the filling amount of the base metal is executed according to the process requirement, and the base metal is not contacted with the multiple layers;
2) performing penetration detection after the welding of the transition layer is finished, and meeting the requirement of NB/T47013.5-2015I level, if a defect occurs, removing the defect and performing repair welding after the defect is qualified, and then performing multilayer welding;
3) the temperature between the transition layer and the multilayer welding layer is controlled to be 60-150 ℃, and the temperature is not suitable to exceed the temperature or be lower than the temperature for welding;
4) and after the multilayer welding is finished, performing spectrum detection on the multilayer to ensure that the components of the multilayer meet the requirements.
TABLE 1
Example 1
An automatic welding method for a low alloy steel composite nickel-based alloy with the material quality of Q345R + N10276 and the specification of phi 2000 × (14+4) comprises the following steps:
1. the groove is machined by a machining method in a V-shaped 22-degree groove form, and the machining form is shown in figure 1.
2. Cleaning up impurities such as oil stains, iron rust and the like in the welding wire, the welding seam groove and the range of 50mm on two sides of the groove;
the welding wire is an ERNiCrMo-3 submerged arc welding wire with specification
Chemical components: 0.03% of C, 0.3% of Mn0.3%, Fe 3%, 0.01% of P, 0.01% of S, 0.4% of Si, 0.03% of Cu0.6%, 61.6% of Ni61, 0.03% of Ti0.03%, Cr 22%, Nb3.7%, 0.1% of Al, 8.7% of Mos, and the balance of impurities.
3. And (4) welding the base layer, namely sequentially performing base layer priming, base layer filling and cover layer welding.
Backing and welding a base layer: the welding current is 180A, the welding voltage is 30V, and the welding speed is 35 cm/min;
base layer filling and cover surface welding: the welding current is 550A, the welding voltage is 35V, and the welding speed is 45 cm/min;
wherein, the welding of the base layer is 2mm lower than the boundary line between the composite layer and the base layer.
4. And performing ray detection on the base layer to meet NB/T47013.2-2015 II level qualification, and performing penetration detection on the base layer to meet NB/T47013.5-2015I level qualification.
5. And welding the transition layer and the multiple layers.
Welding a transition layer: the welding current is 260A, the welding voltage is 28V, and the welding speed is 35 cm/min;
multilayer welding: the welding current is 280A, the welding voltage is 30V, and the welding speed is 35 cm/min.
The interlayer temperature is controlled to be 60-150 ℃ in the welding process, and the welding of the transition layer is 0.5mm higher than the boundary line between the composite layer and the base layer.
6. And (4) immediately carrying out penetration detection after the welding of the transition layer is finished, and meeting the qualification of NB/T47013.5-2015I level. And (4) after the welding of the multiple layers is finished, performing permeation detection on the multiple layers, and meeting the requirement of NB/T47013.5-2015I grade.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A submerged arc welding method for a C-276 composite plate is characterized by comprising the following steps:
(1) performing groove machining on a welding part, wherein a single-side V-shaped inner groove is adopted, and the single-side angle of the groove is 20-22 degrees;
(2) cleaning the welding wire, the groove and two sides of the groove;
(3) sequentially carrying out secondary shielded welding, submerged automatic welding and welding for bottoming the base layer of the inner opening of the welding seam and filling the base layer;
(4) back gouging the welding seam on the back of the base layer and welding a cover surface layer;
(5) detecting the base layer;
(6) and welding the transition layer and the multiple layers in sequence.
2. The submerged arc welding method according to claim 1, characterized in that after the groove is machined in step (1), the groove is subjected to penetration detection.
3. The submerged arc welding method according to claim 1, characterized in that the cleaning areas on both sides of the groove in the step (2) are within 50mm of both sides of the groove, and the silvery white surface of the clad layer is acceptable and the blackening is not caused.
4. The submerged arc welding method according to claim 1, characterized in that in the step (3), the welding of the base layer of the inner port is 2-4 mm lower than the boundary line between the clad layer and the base layer.
5. A submerged arc welding process as claimed in claim 1, wherein the back surface back gouging of the substrate in step (4) is performed by mechanical gouging.
6. A submerged arc welding process as claimed in claim 1, characterized in that the substrate inspection of step (5) uses radiation inspection and penetration inspection.
7. The submerged arc welding method according to claim 1, characterized in that in the step (6), the welding of the transition layer is 0.5 to 1.5mm higher than the boundary line between the clad layer and the base layer.
8. The submerged arc welding method according to claim 1, characterized in that the interlayer temperature during the welding of the transition layer and the clad layer in the step (6) is controlled within a range of 60 to 150 ℃.
9. The submerged arc welding method of claim 1, characterized in that in the step (2), an ERNiCrMo-3 submerged arc welding wire is used as the welding wire, the specification is 2.5mm, and the chemical composition is as follows: less than or equal to 0.1 percent of C, less than or equal to 0.5 percent of Mn, less than or equal to 5 percent of Fe, less than or equal to 0.02 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.5 percent of Si, less than or equal to 0.5 percent of Cu, more than or equal to 58 percent of Ni, less than or equal to 0.4 percent of Ti, 20-23 percent of Cr, 3.15-4.15 percent of Nb3, less than or.
10. A submerged arc welding method as claimed in claim 1, characterized in that the welding process comprises:
1) backing and welding a base layer: the welding current is 110-200A, the welding voltage is 22-33V, and the welding speed is 25-35 cm/min;
2) base layer filling and cover surface welding: the welding current is 480-580A, the welding voltage is 28-35V, and the welding speed is 35-45 cm/min;
3) welding a transition layer: the welding current is 220-300A, the welding voltage is 28-32V, and the welding speed is 25-35 cm/min;
4) multilayer welding: the welding current is 240-300A, the welding voltage is 28-32V, and the welding speed is 25-35 cm/min.
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Cited By (4)
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| CN112548268A (en) * | 2020-12-31 | 2021-03-26 | 江苏京沪重工有限公司 | Welding method for butt weld of stainless steel composite plate |
| CN112589333A (en) * | 2020-11-24 | 2021-04-02 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Dissimilar steel welded joint |
| CN112620897A (en) * | 2020-11-30 | 2021-04-09 | 中国化学工程第十四建设有限公司 | Welding method for ultra-low carbon type nickel-based hastelloy pipeline |
| CN114888401A (en) * | 2022-06-22 | 2022-08-12 | 扬州惠通科技股份有限公司 | Welding method of stainless steel composite plate |
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| CN112548268A (en) * | 2020-12-31 | 2021-03-26 | 江苏京沪重工有限公司 | Welding method for butt weld of stainless steel composite plate |
| CN114888401A (en) * | 2022-06-22 | 2022-08-12 | 扬州惠通科技股份有限公司 | Welding method of stainless steel composite plate |
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