CN112548276B - Bimetal welding construction process method for overlaying prefabricated internal repaired mouth bimetal pipeline - Google Patents
Bimetal welding construction process method for overlaying prefabricated internal repaired mouth bimetal pipeline Download PDFInfo
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- B23K9/00—Arc welding or cutting
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- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
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Abstract
The invention belongs to the field of welding of built-up welding prefabricated inner repaired mouth bimetal pipelines, in particular to a bimetal welding construction process method of built-up welding prefabricated inner repaired mouth bimetal pipelines, which adopts double U-shaped butt joint grooves to fuse the truncated edges of a prefabricated inner repaired mouth layer through fusion welding to form a root welding layer, realizes the reliable connection of the corrosion resistant alloy prefabricated inner repaired mouth layer, forms a transition welding layer through the fusion leveling of metal in a built-up welding fusion area, realizes the transition to a low carbon steel welding layer, and completes the welding seam welding through the filling cover surface of a low carbon steel welding material in the welding seam; the bimetallic weld joint finished by the method solves the technical problem that a low-carbon steel welding material cannot weld a stainless steel base metal, avoids the risk of electrochemical corrosion caused by the fact that a prefabricated inner repaired mouth corrosion-resistant alloy layer is fused into low-carbon steel components, and ensures the physical and chemical properties of the weld joint; the process plays an important role in popularization and application of corrosion-resistant alloy prefabricated inner repaired mouth inner anti-corrosion pipelines and prolonging the service life of the pipelines.
Description
Technical Field
The invention relates to the technical field of welding of overlaying prefabricated inner repaired mouth bimetal pipelines, in particular to a bimetal welding construction process method of overlaying prefabricated inner repaired mouth bimetal pipelines.
Background
In the pipeline transportation of corrosive medium, the inner wall of the pipeline needs to be subjected to anti-corrosion treatment to prolong the service life of the pipeline, but the anti-corrosion coating on the inner wall of a welded junction is damaged by the heat input of the butt welding of the pipeline, and the continuity of the inner anti-corrosion coating is usually realized on the inner wall of a pipe end through anti-corrosion alloy surfacing and an anti-corrosion alloy welding seam; at present, the domestic welding of the corrosion-resistant alloy surfacing prefabricated internal repaired mouth pipeline generally adopts a welding method of a lining stainless steel composite pipe: the welding is carried out through the stainless steel welding material, during actual welding construction, as fewer welders are required to master the welding technology of the bimetal composite pipe stainless steel, and the common groove type is difficult to avoid the fusion of the low-carbon steel component of the base metal in the welding seam during welding, the low-carbon steel inclusion in the inner welding seam is easy to cause, when a conductive medium is conveyed, the electrochemical reaction is caused due to the potential difference of the bimetal, the corrosion resistance of the welding seam is reduced, and the condition is particularly serious and difficult to avoid when the root welding layer is burnt through;
another method is to use a bi-metal layered welding method, which is: firstly, welding and fusing a corrosion-resistant alloy layer by adopting a stainless steel welding material, then welding a low-carbon steel base metal on a root welding layer by adopting a low-carbon steel welding material, and finally forming a bimetal welding line; the reason why the method is represented as 'incomplete penetration' in radiographic inspection is that the low-carbon steel welding material cannot be welded with the stainless steel base metal (or the stainless steel root welding layer) due to the differences of the melting points and the materials of the two metals and the physical and chemical properties, and cannot reach the qualified standard in a mechanical property test.
At present, no bimetal transition welding material exists, namely, the bimetal transition welding material can be fused with a corrosion-resistant alloy overlaying layer to form a welding layer, and a common low-carbon steel welding material can be fused with the welding layer to form the welding layer, so that the problem that the bimetal welding line cannot be completely fused is difficult to solve, the inner welding layer is made of stainless steel materials, the outer welding layer is made of low-carbon steel materials, and the bimetal welding line which is good in fusion can not be realized in practice.
Disclosure of Invention
The invention aims to solve the defect that a bimetal welding seam cannot be penetrated in the prior art, and provides a bimetal welding construction process method for overlaying a prefabricated internal repaired mouth bimetal pipeline.
In order to achieve the purpose, the invention adopts the following technical scheme:
a bimetal welding construction process method for overlaying a prefabricated internal repaired mouth bimetal pipeline is characterized in that an upper U-shaped groove and a lower U-shaped groove are processed at the end of a corrosion-resistant alloy overlaying prefabricated internal repaired mouth steel pipe as shown in figure 1, wherein the truncated edge of the bottom layer groove is completely formed by overlaying corrosion-resistant alloy, a bevel face is formed by metal in an overlaying fusion area, metal alloy components of the bevel face contain low-carbon steel components in a certain proportion due to 'dilution' caused by overlaying, and the proportion changes along with 'penetration' (the overlaying dilution alloy is called as the overlaying dilution alloy for short in the following); the upper U-shaped bevel face is completely composed of a low-carbon steel base metal;
during welding construction, the blunt edges which are in gapless butt joint are melted by adopting pulsed argon arc to form a root welding layer which is formed by a corrosion-resistant alloy overlaying layer and has one-side welding and two-side forming, and the continuity of the inner corrosion-resistant layer is realized as shown in (figure 2) by connecting the corrosion-resistant alloy welding line, the prefabricated corrosion-resistant alloy inner repaired mouth layer and the prefabricated inner corrosion-resistant coating;
then, melting and leveling the lower U-shaped bevel face through argon arc oscillation by a tungsten electrode and fusing the lower U-shaped bevel face and a root welding layer together to form a transition welding layer as shown in a figure 3, wherein the alloy components of the transition layer contain a certain proportion of corrosion-resistant alloy components and can be effectively fused with the corrosion-resistant alloy layer; the alloy also contains a certain proportion of low-carbon steel components, and can be reliably fused with low-carbon steel deposited metal;
finally, filling and welding a cover surface welding layer on the transition layer by low-carbon steel welding rod arc welding or other welding methods to finish the butt welding of the corrosion-resistant alloy surfacing prefabricated inner repaired mouth pipeline;
the performance of the welding seam finished by the process method can reach the specification of relevant standards;
the welding process method is a welding process method of the corrosion-resistant alloy prefabricated inner repaired mouth pipeline, wherein the corrosion-resistant alloy welding material does not need to be filled, and the welding line is formed by bimetal;
when the all-position automatic welding is adopted, the welding process can be completed at one time;
the welding process of the bimetal butt weld of the surfacing prefabricated internal repaired mouth bimetal pipeline comprises the processes of double U-shaped groove processing, gapless assembly and back protection of a pipe orifice, fusion welding root welding and fusion welding transition layer welding, low-carbon steel welding material metal filling cover surface welding and the like, wherein the welded pipeline bimetal butt weld is as shown in figure 4;
1. processing a double U-shaped groove:
processing an upper U-shaped groove and a lower U-shaped groove as shown in figure 1, wherein the truncated edge of the lower U-shaped groove is completely formed by surfacing corrosion-resistant alloy, and the bevel surface is formed by surfacing diluted alloy; the upper U-shaped bevel face is composed of a low-carbon steel base metal, and the truncated edge of the upper U-shaped bevel face is the bevel face of the lower groove;
2. pipe orifice pairing and back protection:
cleaning the pipe orifice assembly before removing impurity oil stains on the pipe orifice and a nearby area to expose metallic luster at the groove;
the pipe orifice adopts a gapless assembly method as shown in (figure 2), when back welding flux is adopted for protection, protective welding flux is coated on the inner wall of the pipe orifice before assembly; when gas protection is adopted, argon is filled in a butt weld joint to protect a molten pool during welding;
the effect of the pairing method is as follows: the welding of the fusion welding root layer can be realized without filling welding materials;
3. fusion welding root welding and fusion welding of a fusion welding transition layer:
adopting pulsed argon arc to melt the truncated edges which are in gapless butt joint to form a root welding layer which is formed by a corrosion-resistant alloy overlaying layer and has one-side welding and two-side forming, and realizing the continuity of the inner corrosion-resistant layer as shown in (figure 3) by connecting the corrosion-resistant alloy welding line, the prefabricated corrosion-resistant alloy inner repaired mouth layer and the prefabricated inner corrosion-resistant coating;
then argon arc is used for melting and leveling the lower U-shaped bevel surfacing diluted alloy through tungsten electrode swinging and fusing the lower U-shaped bevel surfacing diluted alloy and a root welding layer together to form a transition welding layer as shown in figure 4,
the function of adopting the filling-free welding material for fusion welding is as follows: a. the root welding layer can not be melted with low-carbon steel components, so that the corrosion resistance of the inner wall of the welding line is ensured; b. the surfacing diluted alloy components are melted and leveled to form a transition welding layer of a bimetal interface, which is beneficial to the reliable fusion of the low-carbon steel filling welding layer and the transition welding layer;
4. welding the metal filling cover surface of the low-carbon steel welding material:
filling low-carbon steel welding materials on the transition welding layer by adopting welding methods such as automatic welding or shielded metal arc welding to complete the welding of the pipe orifice, wherein the bimetal butt welding seam of the welded pipeline is shown as a figure 5;
and finishing the bimetal welding of the corrosion-resistant alloy prefabricated inner repaired mouth pipeline.
In the invention:
1. the root welding layer formed by single-side welding and double-side forming is formed by the fillet fusion welding of the U-shaped groove under the surfacing corrosion-resistant alloy, so that the risk of bimetallic electrochemical corrosion caused by the low-carbon steel component fused into the welding line is avoided, and the corrosion resistance of the inner surface of the welding line is ensured;
2. the lower U-shaped groove is a transition welding layer formed by argon arc melting of a groove face formed by overlaying diluted alloy, so that the effect of connecting the corrosion-resistant alloy welding layer and the low-carbon steel welding layer is achieved, and favorable conditions are provided for reliable fusion of a low-carbon steel welding material and transition layer metal;
3. forming a reliable bimetal welding seam by an upper U-shaped groove formed by a low-carbon steel base material and a low-carbon steel welding material filling cover surface;
the invention solves the problem that the low-carbon steel welding material cannot be reliably fused with the bottom stainless steel welding layer, provides a new choice for butt welding of the corrosion-resistant alloy prefabricated internal repaired mouth pipeline, and has important significance for facilitating welding construction of the corrosion-resistant alloy prefabricated internal repaired mouth pipeline, prolonging the service life of the pipeline, reducing the safety and environmental protection risks of corrosion leakage of the pipeline and reducing resource waste.
Drawings
FIG. 1 is a schematic view of double U groove machining according to the present invention;
FIG. 2 is a schematic view of the paired orifice and back protection of the present invention;
FIG. 3 is a schematic illustration of fusion welding root welds and welds of fusion welded transition layers of the present invention;
FIG. 4 is a schematic view of forming a transitional weld layer according to the present invention;
FIG. 5 is a schematic illustration of the welding of the metal filled cap of the low carbon steel weld material of the present invention;
fig. 6 is a schematic diagram of a bimetal welding construction process for overlaying a prefabricated internal repaired mouth bimetal pipeline provided by the invention.
In the figure: 1) a steel pipe base material; 2) an anti-corrosion coating in the steel pipe; 3) prefabricating an inner repaired mouth layer by using the corrosion resistant alloy; 4) welding a backing welding layer by the corrosion-resistant alloy; 5) a bimetal transition welding layer; 6) a low-carbon steel coating welding layer; 7) welding a low-carbon steel cover surface layer; 8) an upper U-shaped bevel face; 9) surfacing a weld line; 10) and overlaying a fusion area.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1:
the specification phi of the bimetal composite pipe is 914.4mm multiplied by 68mm, the base material is ASTM standard ASTMA671CC65 carbon steel, the corrosion-resistant inner lining layer is UNS N06625 nickel-based alloy, and the thickness of the inner lining layer is 3 mm. The main operation steps are as follows:
firstly, double U-shaped groove machining:
the double U-shaped groove is processed as shown in figure 1, wherein the truncated edge of the lower U-shaped groove is completely formed by surfacing corrosion-resistant alloy, and the bevel surface is formed by surfacing diluted alloy; the upper U-shaped bevel face is composed of a low-carbon steel base metal, and the truncated edge of the upper U-shaped bevel face is the bevel face of the lower groove;
(II) protecting the pipe orifice group and the back:
cleaning the pipe orifice before assembling the pipe orifice, removing impurity oil stains on the pipe orifice and nearby areas, exposing metal luster on the groove, checking the processing quality of the pipe orifice, and assembling the pipe orifice after ensuring the integrity of the pipe orifice and accessory areas;
the pipe orifice adopts a gapless assembly method as shown in (figure 2), when back welding flux is adopted for protection, protective welding flux is coated on the inner wall of the pipe orifice before assembly; when gas shielding is adopted, argon is filled into the butt weld joint during welding;
and (III) fusion welding root welding and fusion welding of the transition layer:
adopting pulsed argon arc to melt the truncated edges of the lower U-shaped grooves butted without gaps to form a root welding layer which is formed by a corrosion-resistant alloy overlaying layer and formed by single welding and double surfaces, and realizing the continuity of the inner corrosion-resistant layer as shown in (figure 3) by connecting the corrosion-resistant alloy welding line, the prefabricated corrosion-resistant alloy inner joint coating and the prefabricated inner corrosion-resistant coating;
then the surfacing diluted alloy of the lower U-shaped bevel face is melted and leveled by a tungsten electrode swinging argon arc and is fused with a root welding layer to form a transition welding layer as shown in figure 4,
and (IV) welding the metal filling cover surface of the low-carbon steel welding material:
filling low-carbon steel welding materials on the transition welding layer by adopting welding methods such as automatic welding or shielded metal arc welding to complete the welding of the pipe orifice, wherein the bimetal butt welding seam of the welded pipeline is shown as a figure 5;
and finishing the bimetal welding of the corrosion-resistant alloy prefabricated inner repaired mouth pipeline.
In the invention, the groove in the step (I) adopts a double-U-shaped groove, and the structure of the double-U-shaped groove comprises an upper U-shaped groove surface and a lower U-shaped groove surface; in the step (I), the slope angle of the groove is 7 degrees, the thickness of the truncated edge is 1.7mm, the corrosion resistance treatment on the surface of the groove lining layer is to etch the surface of the groove lining layer by using a saturated copper sulfate solution so as to confirm that the nickel-based residue on the surface of the carbon steel is completely removed, the base material of the bimetallic pipeline is low-temperature carbon steel with the tensile strength not less than 450MPa, the material of the corrosion-resistant lining layer is nickel-based 625 alloy, and the base body and the lining layer are metallurgically bonded; the carbon steel substrate welding material is AWS A5.18 argon arc welding wire + AWS A5.17 submerged arc welding wire or AWS A5.18 argon arc welding wire + AWS A5.29 carbon dioxide gas shielded welding wire, the lining layer welding material is AWS A5.11E NiCrMo-3 welding material, and the low-carbon steel welding material is TG-S50 argon arc welding back cover; TG-S50 argon arc welding, DW-A55L SR semi-automatic carbon dioxide gas shielded welding or LA-71 submerged arc welding is selected for filling, wherein the submerged arc welding flux is 880M; DW-A55L SR semi-automatic carbon dioxide gas shielded welding or LA-71 submerged arc welding cover surface is selected, wherein the submerged arc welding flux is 880M; the welding material of the inner liner layer is INCONEL WE112 welding rod; after the preparation of welding materials is finished, scrubbing the welding materials by using absolute ethyl alcohol solution before welding, melting the truncated edges of the U-shaped grooves in gapless butt joint by adopting pulsed argon arc to form a root welding layer formed by a corrosion-resistant alloy overlaying layer in the step (three), melting and leveling the overlaying diluted alloy of the lower U-shaped groove surface by argon arc through tungsten electrode swing and fusing the alloy and the root welding layer together to form a transition welding layer, setting the parameters of the shielded metal arc welding process to be welding current 60A, setting the welding speed to be 85mm/Min, controlling the heat input quantity to be not more than 1.6KJ/mm, and at least ensuring two layers of four overlaying welding processes, wherein the parameters of the root welding process are as follows: the welding material model is ER 316L; the diameter of the welding material is 2.5 mm; the welding direction is upward; the welding current is 55A; the arc voltage is 8V; the welding speed is 5 cm/min; the argon flow on the back surface is 10L/min, and the groove is manufactured by adopting a machining method or a machining and polishing method.
Example 2:
the specification of the bimetal composite sea pipe is phi 219.1 multiplied by 14.3+3mm, wherein the parent metal is made of PSL2X65SMLS material adopting API standard, and the lining is made of stainless steel material of 316L. The process method mainly comprises the following operation steps:
firstly, double U-shaped groove machining:
the double U-shaped groove is processed as shown in figure 1, wherein the truncated edge of the lower U-shaped groove is completely formed by surfacing corrosion-resistant alloy, and the bevel surface is formed by surfacing diluted alloy; the upper U-shaped bevel face is composed of a low-carbon steel base metal, and the truncated edge of the upper U-shaped bevel face is the bevel face of the lower groove;
(II) protecting the pipe orifice group and the back:
cleaning the pipe orifice before assembling the pipe orifice, removing impurity oil stains on the pipe orifice and nearby areas, exposing metal luster on the groove, checking the processing quality of the pipe orifice, and assembling the pipe orifice after ensuring the integrity of the pipe orifice and accessory areas;
the pipe orifice adopts a gapless assembly method as shown in (figure 2), when back welding flux is adopted for protection, protective welding flux is coated on the inner wall of the pipe orifice before assembly; when gas shielding is adopted, argon is filled into the butt weld joint during welding;
and (III) welding root welding and welding the fusion welding transition layer:
adopting pulsed argon arc to melt the truncated edges of the lower U-shaped grooves butted without gaps to form a root welding layer which is formed by a corrosion-resistant alloy overlaying layer and formed by single welding and double surfaces, and realizing the continuity of the inner corrosion-resistant layer as shown in (figure 3) by connecting the corrosion-resistant alloy welding line, the prefabricated corrosion-resistant alloy inner joint coating and the prefabricated inner corrosion-resistant coating;
then the surfacing diluted alloy of the lower U-shaped bevel face is melted and leveled by a tungsten electrode swinging argon arc and is fused with a root welding layer to form a transition welding layer as shown in figure 4,
and (IV) welding the metal filling cover surface of the low-carbon steel welding material:
filling low-carbon steel welding materials on the transition welding layer by adopting welding methods such as automatic welding or shielded metal arc welding to complete the welding of the pipe orifice, wherein the bimetal butt welding seam of the welded pipeline is shown as a figure 5;
and finishing the bimetal welding of the corrosion-resistant alloy prefabricated inner repaired mouth pipeline.
In the invention, the groove in the step (I) adopts a double-U-shaped groove, and the structure of the double-U-shaped groove comprises an upper U-shaped groove surface and a lower U-shaped groove surface; in the step (I), the slope angle of the groove is 8 degrees, the thickness of the truncated edge is 1.8mm, the corrosion resistance treatment on the surface of the groove lining layer is to etch the surface of the groove lining layer by using a saturated copper sulfate solution so as to confirm that the nickel-based residue on the surface of the carbon steel is completely removed, the base body of the bimetallic pipeline is low-temperature carbon steel with the tensile strength not less than 450MPa, the corrosion-resistant lining layer is a nickel-based 625 alloy, and the base body and the lining layer are metallurgically bonded; the carbon steel substrate welding material is AWS A5.18 argon arc welding wire + AWS A5.17 submerged arc welding wire or AWS A5.18 argon arc welding wire + AWS A5.29 carbon dioxide gas shielded welding wire, the lining layer welding material is AWS A5.11E NiCrMo-3 welding material, and the low-carbon steel welding material is TG-S50 argon arc welding back cover; TG-S50 argon arc welding, DW-A55L SR semi-automatic carbon dioxide gas shielded welding or LA-71 submerged arc welding is selected for filling, wherein the submerged arc welding flux is 880M; DW-A55L SR semi-automatic carbon dioxide gas shielded welding or LA-71 submerged arc welding cover surface is selected, wherein the submerged arc welding flux is 880M; the welding material of the inner liner layer is INCONEL WE112 welding rod; after the preparation of welding materials is finished, scrubbing the welding materials by using absolute ethyl alcohol solution before welding, melting the truncated edges of the U-shaped grooves in gapless butt joint by adopting pulsed argon arc to form a root welding layer formed by a corrosion-resistant alloy overlaying layer in the step (three), melting and leveling the overlaying diluted alloy of the lower U-shaped groove surface by argon arc through tungsten electrode swing and fusing the alloy and the root welding layer together to form a transition welding layer, setting the parameters of the shielded metal arc welding process to be welding current 80A, setting the welding speed to be 100mm/Min, controlling the heat input quantity to be not more than 1.6KJ/mm, and at least ensuring two layers of four overlaying welding processes, wherein the parameters of the root welding process are as follows: the welding material model is ER 316L; the diameter of the welding material is 2.5 mm; the welding direction is upward; the welding current is 70A; the arc voltage is 10V; the welding speed is 8 cm/min; the argon flow on the back surface is 12L/min, and the groove is manufactured by adopting a machining method or a machining and grinding method.
Example 3:
the specification of the bimetal composite sea pipe is phi 219.1 multiplied by 14.3+3mm, wherein the parent metal is made of PSL2X65SMLS material adopting API standard, and the lining is made of stainless steel material of 316L. The process method mainly comprises the following operation steps:
firstly, double U-shaped groove machining:
the double U-shaped grooves are processed as shown in figure 1, wherein the truncated edges of the lower U-shaped groove are all made of surfacing corrosion-resistant alloy, and the groove surface is made of surfacing diluted alloy; the upper U-shaped bevel face is composed of a low-carbon steel base metal, and the truncated edge of the upper U-shaped bevel face is the bevel face of the lower groove;
(II) protecting the pipe orifice group and the back:
cleaning the pipe orifice before assembling the pipe orifice, removing impurity oil stains on the pipe orifice and nearby areas, exposing metal luster on the groove, checking the processing quality of the pipe orifice, and assembling the pipe orifice after ensuring the integrity of the pipe orifice and accessory areas;
the pipe orifice adopts a gapless assembly method as shown in (figure 2), when back welding flux is adopted for protection, protective welding flux is coated on the inner wall of the pipe orifice before assembly; when gas shielding is adopted, argon is filled into the butt weld joint during welding;
and (III) fusion welding root welding and fusion welding of the transition layer:
adopting pulsed argon arc to melt the truncated edges of the lower U-shaped grooves butted without gaps to form a root welding layer which is formed by a corrosion-resistant alloy overlaying layer and formed by single welding and double surfaces, and realizing the continuity of the inner corrosion-resistant layer as shown in (figure 3) by connecting the corrosion-resistant alloy welding line, the prefabricated corrosion-resistant alloy inner joint coating and the prefabricated inner corrosion-resistant coating;
then the surfacing diluted alloy of the lower U-shaped bevel face is melted and leveled by a tungsten electrode swinging argon arc and is fused with a root welding layer to form a transition welding layer as shown in figure 4,
and (IV) welding the metal filling cover surface of the low-carbon steel welding material:
filling a low-carbon steel welding material on the transition welding layer by adopting a welding method such as automatic welding or shielded metal arc welding to complete the welding of the pipe orifice, wherein the bimetal butt weld of the welded pipeline is shown as a figure 5;
and finishing the bimetal welding of the corrosion-resistant alloy prefabricated inner repaired mouth pipeline.
In the invention, the groove in the step (I) adopts a double-U-shaped groove, and the structure of the double-U-shaped groove comprises an upper U-shaped groove surface and a lower U-shaped groove surface; in the step (I), the slope angle of the groove is 9 degrees, the thickness of the truncated edge is 1.9mm, the corrosion resistance treatment on the surface of the groove lining layer is to etch the surface of the groove lining layer by using a saturated copper sulfate solution so as to confirm that the nickel-based residue on the surface of the carbon steel is completely removed, the base body of the bimetallic pipeline is low-temperature carbon steel with the tensile strength not less than 450MPa, the corrosion-resistant lining layer is a nickel-based 625 alloy, and the base body and the lining layer are metallurgically bonded; the carbon steel substrate welding material is AWS A5.18 argon arc welding wire + AWS A5.17 submerged arc welding wire or AWS A5.18 argon arc welding wire + AWS A5.29 carbon dioxide gas shielded welding wire, the lining layer welding material is AWS A5.11E NiCrMo-3 welding material, and the low-carbon steel welding material is TG-S50 argon arc welding back cover; TG-S50 argon arc welding, DW-A55L SR semi-automatic carbon dioxide gas shielded welding or LA-71 submerged arc welding is selected for filling, wherein the submerged arc welding flux is 880M; DW-A55L SR semi-automatic carbon dioxide gas shielded welding or LA-71 submerged arc welding cover surface is selected, wherein the submerged arc welding flux is 880M; the welding material of the inner liner layer is INCONEL WE112 welding rod; after the preparation of welding materials is finished, scrubbing the welding materials by using absolute ethyl alcohol solution before welding, melting the truncated edges of the U-shaped grooves in gapless butt joint by adopting pulsed argon arc to form a root welding layer formed by a corrosion-resistant alloy overlaying layer in the step (three), melting and leveling the overlaying diluted alloy of the lower U-shaped groove surface by argon arc through tungsten electrode swing and fusing the alloy and the root welding layer together to form a transition welding layer, setting the parameters of the shielded metal arc welding process to be welding current 95A, setting the welding speed to be 120mm/Min, controlling the heat input quantity to be not more than 1.6KJ/mm, and at least ensuring two layers of four overlaying welding processes, wherein the parameters of the root welding process are as follows: the welding material model is ER 316L; the diameter of the welding material is 2.5 mm; the welding direction is upward; the welding current is 80A; the arc voltage is 13V; the welding speed is 12 cm/min; the argon flow on the back surface is 15L/min, and the groove is manufactured by adopting a machining method or a machining and polishing method.
According to the working principle, when the corrosion-resistant alloy surfacing welding is adopted to prefabricate the truncated edge fusion welding of the inner repaired mouth layer, the risk of electrochemical corrosion caused by the fusion of low-carbon steel components of a root welding layer can be avoided, but the low-carbon steel welding material cannot be used for completely fusing a bimetallic interface when being welded on the corrosion-resistant alloy root welding layer, because the low-carbon steel welding material cannot be used for welding the corrosion-resistant alloy; because the surfacing prefabricated inner repaired mouth is formed by performing corrosion-resistant alloy surfacing on the inner wall of the pipe end of the low-carbon steel pipe, the alloy components of a surfacing layer and a base metal fusion area are changed, and the alloy components are expressed as dilution of the corrosion-resistant alloy components and alloying of the low-carbon steel base metal, and the surfacing diluted alloy can be fused with the corrosion-resistant alloy welding material and the low-carbon steel welding material to form a bridge fused between double metals, so that the double-metal welding seam is realized;
the welding process problem of the bimetal butt weld of the surfacing prefabricated inner repaired mouth bimetal pipeline is solved; the on-site welding difficulty and the construction cost are reduced, and a new choice is provided for the welding construction of the surfacing prefabricated internal repaired mouth bimetal pipeline.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A bimetal welding construction process method for overlaying a prefabricated internal repaired mouth bimetal pipeline is characterized by comprising the following steps:
firstly, double U-shaped groove machining:
processing a double-U-shaped groove, wherein the truncated edge of the lower U-shaped groove is completely formed by surfacing corrosion-resistant alloy, and the groove surface is formed by surfacing diluted alloy; the upper U-shaped bevel face is composed of a low-carbon steel base metal, and the truncated edge of the upper U-shaped bevel face is the bevel face of the lower groove;
(II) protecting the pipe orifice group and the back:
cleaning the pipe orifice before assembling the pipe orifice, removing impurity oil stains on the pipe orifice and nearby areas, exposing metal luster on the groove, checking the processing quality of the pipe orifice, and assembling the pipe orifice after ensuring the integrity of the pipe orifice and accessory areas;
the pipe orifice adopts a gapless assembly method, and when back welding flux is adopted for protection, the inner wall of the pipe orifice is coated with protection welding flux before assembly; when gas shielding is adopted, argon is filled into the butt weld joint during welding;
and (III) fusion welding root welding and fusion welding of the transition layer:
the lower U-shaped groove truncated edges which are in gapless butt joint are melted by adopting pulsed argon arc to form a root welding layer which is formed by a corrosion-resistant alloy overlaying layer and formed on one side and two sides, and the continuity of the inner corrosion-resistant layer is realized by connecting the corrosion-resistant alloy welding line, the prefabricated corrosion-resistant alloy inner joint coating and the prefabricated inner corrosion-resistant coating;
then, melting and leveling the overlay welding diluted alloy on the lower U-shaped bevel face through a tungsten electrode swinging argon arc and fusing the overlay welding diluted alloy and a root welding layer together to form a transition welding layer;
and (IV) welding the metal filling cover surface of the low-carbon steel welding material:
filling low-carbon steel welding materials on the transition welding layer by adopting a welding method such as automatic welding or shielded metal arc welding to complete the welding of the pipe orifice, and performing bimetal butt welding on the welded pipeline;
the double-U-shaped groove machining in the step (I) comprises the following steps: and etching the surface of the groove lining layer by using a saturated copper sulfate solution to confirm that the nickel-based residue on the surface of the carbon steel is completely removed.
2. The bimetal welding construction process method for overlaying a prefabricated internal repaired mouth bimetal pipeline according to claim 1, wherein the groove in the step (I) adopts a double U-shaped groove, and the structure of the double U-shaped groove comprises an upper U-shaped groove surface and a lower U-shaped groove surface.
3. The bimetal welding construction process method for overlaying the prefabricated inner repaired mouth bimetal pipeline according to claim 1, wherein in the step (one), the slope angle of the groove is 7-9 degrees, and the thickness of the truncated edge is 1.7-1.9 mm.
4. The bimetal welding construction process method for overlaying a prefabricated internal repaired mouth bimetal pipeline according to claim 1, wherein the bimetal pipeline is made of low-temperature carbon steel with the tensile strength not less than 450MPa, the corrosion-resistant lining layer is made of nickel-based 625 alloy, and the substrate and the lining layer are metallurgically bonded; the carbon steel substrate welding material is AWS A5.18 argon arc welding wire + AWS A5.17 submerged arc welding wire or AWS A5.18 argon arc welding wire + AWS A5.29 carbon dioxide gas shielded welding wire, and the lining layer welding material is AWS A5.11E NiCrMo-3 welding material.
5. The bimetal welding construction process method for overlaying prefabricated internal repaired mouth bimetal pipelines according to claim 1, characterized in that the low-carbon steel welding material is TG-S50 argon arc welding back cover; TG-S50 argon arc welding, DW-A55L SR semi-automatic carbon dioxide gas shielded welding or LA-71 submerged arc welding is selected for filling, wherein the submerged arc welding flux is 880M; DW-A55L SR semi-automatic carbon dioxide gas shielded welding or LA-71 submerged arc welding cover surface is selected, wherein the submerged arc welding flux is 880M; the welding material of the inner liner is INCONEL WE112 welding rod; after the welding material is prepared, the welding material is scrubbed by absolute ethyl alcohol solution before welding.
6. The bimetal welding construction process method for overlaying prefabricated internal repaired mouth bimetal pipelines according to claim 1, wherein in the step (three), the truncated edges of the U-shaped grooves which are in gapless butt joint are melted by adopting pulsed argon arc to form a root welding layer formed by the corrosion resistant alloy overlaying layer, and the overlaying diluted alloy melting flow of the lower U-shaped slope surface is leveled and fused with the root welding layer together by the argon arc through tungsten electrode swing to form a transition welding layer.
7. The bimetal welding construction process method for overlaying a prefabricated internal repaired mouth bimetal pipeline according to claim 1, wherein the parameters of the shielded metal arc welding process are set to be welding current of 60-95A, welding speed of 85-120 mm/Min, heat input is controlled to be not more than 1.6KJ/mm, and at least two layers of four overlaying welding processes are ensured.
8. The bimetal welding construction process method for overlaying a prefabricated internal repaired mouth bimetal pipeline according to claim 1, wherein the root welding process parameters are as follows: the welding material model is ER 316L; the diameter of the welding material is 2.5 mm; the welding direction is upward; the welding current is 55-80A; the arc voltage is 8-13V; the welding speed is 5-12 cm/min; the argon flow on the back surface is 10-15L/min.
9. The bimetal welding construction process method for overlaying a prefabricated internal repaired mouth bimetal pipeline according to claim 1, characterized in that the groove is manufactured by machining or a method of machining and grinding.
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