CN110814478A - Overlaying welding manufacturing method for lug boss of hydrogenation reactor made of vanadium steel - Google Patents
Overlaying welding manufacturing method for lug boss of hydrogenation reactor made of vanadium steel Download PDFInfo
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- CN110814478A CN110814478A CN201911172522.9A CN201911172522A CN110814478A CN 110814478 A CN110814478 A CN 110814478A CN 201911172522 A CN201911172522 A CN 201911172522A CN 110814478 A CN110814478 A CN 110814478A
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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
- B23K9/04—Welding for other purposes than joining, e.g. built-up 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
- B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
- B23K9/133—Means for feeding electrodes, e.g. drums, rolls, motors
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Abstract
The invention relates to a surfacing manufacturing method for a lug boss of a hydrogenation reactor for vanadium steel, belonging to the field of welding manufacturing. The surfacing method for manufacturing the lug boss of the hydrogenation reactor for vanadium steel comprises the following steps: preheating the vanadium-added steel base material to be more than or equal to 165 ℃, performing surfacing welding on the surface of the base material by adopting composite cold wire submerged arc welding, performing postweld heat treatment, and cooling to obtain a surfacing welding boss; the composite cold wire submerged arc welding is to adopt two identical welding guns to carry out welding, wherein each welding gun comprises 1 hot wire and 2 cold wires; the surfacing process parameters are as follows: the welding speed of the two main wires is 450-; the wire feeding speed of the front auxiliary wire is 200 +/-20 mm/min, and the wire feeding speed of the rear auxiliary wire is 1500 +/-50 mm/min; interlayer temperature 165-250 ℃; the maximum linear energy was 27.1 KJ/cm. The invention greatly improves the surfacing efficiency of the lug boss on the vanadium steel adding equipment under the condition of ensuring the product quality.
Description
Technical Field
The invention relates to a surfacing manufacturing method for a lug boss of a hydrogenation reactor for vanadium steel, belonging to the field of welding manufacturing.
Background
A supporting boss of an internal part is usually arranged on a product shell of the vanadium steel hydrogenation reactor, the boss needs to be supplemented by the machining allowance of a forge piece as much as possible, and the rest part is supplemented by a mode of surfacing body materials. Because the machining allowance of the forged piece after quenching and tempering is small, and the forged piece is used for compensating the deformation of the barrel after quenching and tempering, the boss is almost formed by build-up welding, the boss needs to be subjected to stress relief treatment in the middle of a furnace after build-up welding, and then is machined and subjected to flaw detection, and the manufacturing process is more. The working procedure time is as long as 20-30 days according to the size of the lug boss, thereby bringing contradictions of equipment occupation, energy consumption and the like. For a reactor with large equipment size and a plurality of bosses, the requirement on the high efficiency of boss surfacing is particularly urgent, for example, 40 bosses need to be surfaced in 6 products of the constant-force petrochemical project manufactured by our company, as shown in fig. 1.
The method has the advantages that the composite cold wire submerged arc welding (multi-gun and multi-wire) can be utilized to improve the surfacing efficiency, two electric arcs share a molten pool during welding, although the width of a welding seam is increased (the effect of strip surfacing is achieved), because the multi-wire is adopted for surfacing at the same time, the increase of welding heat input can cause coarse welding seam grains, so that the impact toughness of the cladding metal is poor, and the evaluation test results of the impact toughness and the tempering embrittlement resistance tendency of the vanadium-added steel are key acceptance indexes. Due to the characteristics of the welding method, the welding method is used for surfacing on the vanadium-added steel base metal, and the impact toughness and tempering embrittlement resistance tendency evaluation test result of boss cladding metal after surfacing cannot meet the requirement of vanadium-added steel performance. Until now, composite cold wire submerged arc welding (multi-gun multi-wire) has not been successfully used for build-up welding on vanadium-containing steel.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-surfacing-efficiency surfacing manufacturing method for a lug boss of a vanadium steel hydrogenation reactor.
The surfacing method for manufacturing the lug boss of the hydrogenation reactor made of vanadium steel comprises the following steps: preheating the vanadium-added steel base material to be more than or equal to 165 ℃, then performing surfacing welding on the surface of the vanadium-added steel base material by adopting composite cold wire submerged arc welding, performing postweld heat treatment after surfacing welding is completed, and cooling to obtain a surfacing welding boss;
the composite cold wire submerged arc welding is characterized in that two identical three-wire welding guns are adopted for welding at the same time, and welding wires of each welding gun are 1 hot wire and 2 cold wires; the two welding guns are perpendicular to the surface of the vanadium-added steel base metal, are respectively arranged on two sides of a welding line to be welded and are arranged side by side in the width direction of the welding line;
on the welder: the projection points of the front end points of the hot wire and the front end points of the two cold wires on the surface of the workpiece to be welded are positioned on the same straight line, the projection point of the hot wire is positioned between the projection points of the two cold wires, wherein the hot wire is communicated with a power supply and is called a main wire, and the two cold wires are not communicated with the power supply and are called auxiliary wires; in the welding process, a straight line connecting three welding wire projection points of a welding gun is parallel to the welding direction; in the welding direction, the front cold wire is a front auxiliary wire, and the rear cold wire is a rear auxiliary wire;
the technological parameters adopted by surfacing are as follows: the welding speed of the two main wires is 450-550mm/min, the welding current is 500-580A, and the arc voltage is 30-35V; controlling the wire feeding speed of the front auxiliary wire of each main wire to be 200 +/-20 mm/min, and controlling the wire feeding speed of the rear auxiliary wire to be 1500 +/-50 mm/min; the interlayer temperature is 165-250 ℃; the maximum linear energy was 27.1 KJ/cm.
Preferably, the cold wire and the hot wire are made of the same material and are both US-521H welding wires; the flux was PF 500.
Preferably, the hot wire has a diameter of 4.0mm and the cold wire has a diameter of 2.0 mm.
Preferably, on the welding gun, the two cold wires are symmetrically arranged relative to the extension axis of the hot wire, the extension axis of the cold wire and the extension axis of the hot wire form an included angle, and the included angle enables the hot wire and the two cold wires to be gathered towards the generation direction of the electric arc; the shortest distance from the front end point of the cold wire to the surface of the hot wire is 2-3 mm.
Preferably, the wire feeding speed of the front auxiliary wire is controlled to be 200 mm/min; the wire feeding speed of the rear auxiliary wire is 1500 mm/min.
Preferably, the welding speed of the two main wires is 500mm/min, the welding current is 540-550A, and the arc voltage is 33V; preferably, the welding current for one main wire is 540A and the welding current for the other main wire is 550A.
Preferably, during welding, the hot wire has a rod elongation of 35 ± 2mm and the distance between the two main wires is 15 mm.
Preferably, the material of the parent metal of the hydrogenation reactor of the vanadium steel is 12Cr2Mo 1V.
Preferably, the thickness of the overlaying is 30-45 mm.
Preferably, the post-welding heat treatment is dehydrogenation treatment or stress relief treatment; preferably, the dehydrogenation treatment is carried out at 300-350 ℃ for at least 2 h.
The invention has the beneficial effects that:
by adjusting the surfacing process parameters and adopting effective surfacing process measures, the surfacing of the composite cold wire submerged arc welding (two guns and six wires) on the vanadium steel boss is realized, and the mechanical property of the boss surfacing layer can meet the manufacturing requirement of the vanadium steel hydrogenation reactor product. Under the precondition of ensuring the product quality, the surfacing efficiency of the lug boss on the vanadium steel adding equipment is greatly improved, the production efficiency can be improved by 2-2.5 times compared with the conventional single-wire submerged arc welding, and the bottleneck of the surfacing manufacturing progress of the lug boss on the vanadium steel adding reactor is effectively solved.
Drawings
FIG. 1 is a view of a boss on the shell of a hydrogenation reactor;
FIG. 2 is a view of a step-by-step cooling embrittlement treatment process;
fig. 3 is a graph showing the results of a full-face bending test of a welded joint in the min.
FIG. 4 illustrates weld formation and skull formation;
FIG. 5 is an operation diagram during overlaying;
FIG. 6 is a view showing a build-up welding condition, wherein a is a view showing a build-up welding boss during build-up welding, and c is a view showing a processed sample;
fig. 7 is a view for evaluating the build-up welding.
Fig. 8 is a schematic view of the side-by-side use of two welding guns of the present invention.
Detailed Description
The invention aims to solve the technical problem of providing a high-surfacing-efficiency surfacing manufacturing method for a lug boss of a vanadium steel hydrogenation reactor.
The surfacing method for manufacturing the lug boss of the hydrogenation reactor made of vanadium steel comprises the following steps: preheating the vanadium-added steel base material to be more than or equal to 165 ℃, then performing surfacing welding on the surface of the vanadium-added steel base material by adopting composite cold wire submerged arc welding, performing postweld heat treatment after surfacing welding is completed, and cooling to obtain a surfacing welding boss;
the composite cold wire submerged arc welding is characterized in that two identical three-wire welding guns are adopted for welding at the same time, welding wires of each welding gun are 1 hot wire and 2 cold wires, the two welding guns are respectively arranged on two sides of a welding seam to be welded and are arranged side by side in the width direction of the welding seam; and the two welding guns are vertical to the surface of the vanadium-added steel base metal;
on each welder: the projection points of the front end points of the hot wire and the front end points of the two cold wires on the surface of the workpiece to be welded are positioned on the same straight line, the projection point of the hot wire is positioned between the projection points of the two cold wires, wherein the hot wire is communicated with a power supply and is called a main wire, and the two cold wires are not communicated with the power supply and are called auxiliary wires; in the welding process, a straight line connecting projection points of three welding wires in a welding gun is parallel to the welding direction; in the welding direction, the front cold wire is a front auxiliary wire, and the rear cold wire is a rear auxiliary wire;
the technological parameters adopted by surfacing are as follows: the welding speed of two main wires in the two welding guns is 450-550mm/min, the welding current is 500-580A, and the arc voltage is 30-35V; controlling the wire feeding speed of the front auxiliary wire of each main wire to be 200 +/-20 mm/min, and controlling the wire feeding speed of the rear auxiliary wire to be 1500 +/-50 mm/min; the interlayer temperature is 165-250 ℃; the maximum linear energy was 27.1 KJ/cm.
Wherein, the front end point of the welding wire refers to the end point of the side of the welding wire where the arc is generated.
The front end point of the hot wire and the front end point of the cold wire refer to the central points of the end points.
When the double-gun six-wire surfacing welding is adopted, currents connected with the two main wires are all alternating currents.
The welding speed, the welding current, the arc voltage, the interlayer temperature, the maximum linear energy and the wire feeding speed of the cold wire are controlled within the ranges, and the evaluation test results of the impact toughness and the tempering embrittlement resistance tendency of the deposited metal after the deposited metal is subjected to overlaying welding beyond the parameter ranges are unqualified.
Preferably, the cold wire and the hot wire are made of the same material and are both US-521H welding wires; the flux was PF 500.
Preferably, the hot wire has a diameter of 4.0mm and the cold wire has a diameter of 2.0 mm. The hot wire and the cold wire are matched, and the welding wire has the specification, so that the welding efficiency is highest, and the performance after welding can meet the requirement. If the diameter of the welding wire is increased, in order to ensure normal welding, the welding specification is large, the heat input is large, and the performance of the welded cladding metal can not meet the performance requirement of 2.25Cr1Mo0.25V vanadium-added steel.
Preferably, on one welding gun, the two cold wires are symmetrically arranged relative to the extension axis of the hot wire, the extension axis of the cold wire and the extension axis of the hot wire form an included angle, and the included angle enables the hot wire and the two cold wires to be gathered towards the generation direction of the electric arc; the shortest distance from the front end point of the cold wire to the surface of the hot wire is 2-3 mm.
Preferably, the wire feeding speed of the front auxiliary wire is controlled to be 200 mm/min; the wire feeding speed of the rear auxiliary wire is 1500 mm/min.
Preferably, the welding speed of the two main wires is 500mm/min, the welding current is 540-550A, and the arc voltage is 33V; more preferably, the welding current for one main wire is 540A and the welding current for the other main wire is 550A.
Preferably, during welding, the rod elongation is 35 ± 2mm and the spacing between the two main wires is 15 mm. The pitch of two main filaments refers to the distance between the axes of the two main filaments.
Preferably, the material of the boss of the vanadizing steel hydrogenation reactor is 12Cr2Mo 1V.
Preferably, the thickness of the overlaying is 30-45 mm.
Preferably, the post-welding heat treatment is dehydrogenation treatment or stress relief treatment; more preferably, the dehydrogenation treatment is carried out at 300-350 ℃ for at least 2 h.
The steel grade of the vanadium-added steel has high cold crack sensitivity, and needs to be subjected to dehydrogenation treatment or stress relief treatment immediately after welding, if the stress relief treatment is carried out, the dehydrogenation treatment can not be carried out, but the temperature is lower than 300 ℃ when the dehydrogenation treatment is carried out, so that cold cracks are easy to appear in the subsequent process; the temperature is too high, the energy is wasted, and the field execution is not convenient.
The following examples are provided to further illustrate the embodiments of the present invention and are not intended to limit the scope of the present invention.
Overlaying welding is carried out on a boss on a hydrogenation reactor for vanadium steel, and the technical indexes are as follows:
(1) the deposited metal has the chemical compositions as shown in the following table 1:
table 1 deposited metal chemistry (Wt%) (min
(2) The deposited metal and the mechanical property requirements of the welding joint are shown in the following table 2:
TABLE 2 deposited metal and mechanical properties of welded joint
(3) And (3) hardness detection: and (5) testing the hardness of the welding seam, the base material and the heat affected zone, and marking three points on each zone, wherein the measured value is less than or equal to 248HV 10.
(4) The test of the tempering embrittlement tendency evaluation requires the following test indexes: vTr54+3.0 delta vTr54 is less than or equal to 0 ℃.
The figure of the procedure of the step-cooling embrittlement treatment is shown in fig. 2. The step cooling test is composed of 8 different temperature points, but the temperature is-30 ℃, the suggested temperature is-100 ℃, 80 ℃, 60 ℃, 40 ℃, 30 ℃, 18 ℃, 0 ℃ and 20 ℃, 3 samples are respectively taken at each temperature for carrying out the Charpy impact test, 48 samples are needed in total, the samples are required to be sampled at two sides of the T/2 central plane of the welding line, and the axis of the samples is vertical to the axis of the welding line. The curve should be complete and should have upper and lower plateau values.
In the process of surfacing by adopting the scheme of the invention, the following problems and solutions appear:
1) in the process of surfacing, the crossbeam shakes very seriously, seriously influences the surfacing forming quality.
The analysis reason is as follows: the front end of the beam is of a hollow structure, and three operation control boxes are arranged in the beam. The rigidity of the front end of the cross beam is not enough, so that the machine head vibrates in the surfacing process.
The solution is as follows: the front end of the beam is made into a solid core, so that the rigidity is increased. The operation control box is placed on the suspension arm.
2) In the process of surfacing, the defect of shunting often appears.
The analysis reason is as follows: a. in the process of overlaying welding of the two main wires, fastening equipment for fixing the distance between the two main wires is loosened frequently, so that the distance is enlarged in the process of overlaying welding, and a lane dividing defect is possibly caused. b. The alternating current frequencies of the two main wires may be out of synchronization in the surfacing process, so that the lane defect may be caused.
The solution is as follows: and reinforcing the fastening equipment, and debugging the alternating current frequency of the two main wires in the surfacing process again.
3) In the process of overlaying welding, the phenomena that one main wire is successfully ignited, the other main wire is not successfully ignited, but the wire feeding system still feeds wires, so that jackscrews are pushed, wire feeding hoses are damaged, and welding defects are generated often occur.
The analysis reason is as follows: when the main wire is not successfully ignited, no voltage or current feedback information exists in the wire feeding mechanism, and the phenomena of wire jacking and welding defects caused by the fact that the wire feeding mechanism continues to feed wires are caused.
The solution is as follows: the feedback system is improved, when the main wire is in arc striking, the voltage or current is reversely information to the wire feeding mechanism, if the main wire is in arc striking, the voltage or current information is fed back to the wire feeding mechanism, and the wire feeding mechanism feeds the wire again. If the main wire is not successfully ignited and no voltage or current information is fed back, the wire feeding mechanism does not feed wires.
The following examples are provided to further illustrate the embodiments of the present invention and are not intended to limit the scope of the present invention.
Examples
1. Base material: 12Cr2Mo 1V.
The welding material is a welding material of Nippon Steel company used on products: hot wire US-521H (wire diameter 4.0mm), cold wire US-521H (wire diameter 2.0mm) and welding flux PF 500.
The thickness of the surfacing is 30-45 mm.
2. Welding test
Preheating the test plate to 165 ℃ before welding, keeping the temperature of the interlayer at 230 ℃ in the welding process, and keeping the temperature for 2 hours at 300 ℃ after welding. Under the precondition of ensuring the molding, surfacing is carried out by different welding specification parameters, and after minimal heat treatment (705 ℃ multiplied by 8h) after surfacing, sampling is carried out for a-30 ℃ impact test.
In the test, Max.PWHT is 705 ℃ multiplied by 32 h; min. PWHT 705 ℃ C.. times.8 h.
The welding guns used in the experiments 1-12# are completely the same, except that a single welding gun (namely, a single gun with three wires) is used in the experiments 1-4# and two welding guns are used side by side in the experiments 5-12# (namely, two guns with six wires, the position relationship is that the two welding guns are perpendicular to the surface of the vanadium-added steel base metal, are respectively arranged on two sides of the same welding line to be welded and are arranged side by side in the width direction of the welding line). When two guns and six wires are adopted for welding, the two main wires adopt alternating current. Specific welding parameters are shown in table 3 below.
TABLE 3
3. Charpy V-notch impact test
The test is carried out by adopting welding parameters of 1# -12#, each group of methods is repeated for 10 times, and the surfacing welding seam is subjected to a summer-30 ℃ V-notch impact test after minimum heat treatment (705 ℃ multiplied by 8h), and the result is shown in the following table 4.
TABLE 4-30 ℃ impact test values for each group
| Numbering | Impact value (J) | 10 test specimens impact average value (J) |
| 1# | 55、46、25、66、94、57、97、24、132、145 | 74.1 |
| 2# | 118、19、38、68、22、100、52、67、19、48 | 55.1 |
| 3# | 91、65、97、90、130、114、89、135、154、146 | 111.1 |
| 4# | 36、38、59、31、21、135、179、116、130、60 | 80.5 |
| 5# | 24、38、18、30、57、54、92、64、21、18 | 41.6 |
| 6# | 39、45、12、47、22、29、22、32、54、11 | 31.3 |
| 7# | 18、12、21、11、23、11、14、21、19、16 | 16.6 |
| 8# | 114、56、108、59、21、45、41、164、43、88 | 73.9 |
| 9# | 86、83、19、45、21、17、23、88、48、16 | 44.6 |
| 10# | 64、76、70、48、133、139、42、35、66、42 | 71.5 |
| 11# | 93、87、82、115、40、23、122、110、113、128 | 85.9 |
| 12# | 83、84、42、19、116、65、41、121、25、39 | 63.5 |
1-4# is a gun three wire build-up weld, and from the above data, when the welding specification adopts 3#, all the impact values are higher than 48J, and the average impact value is highest 111.1J. And the No. 5-12 welding method adopts two-gun six-wire surfacing, and the impact performance is not ideal by adopting the same or similar welding specification of one-gun three-wire surfacing from the view of equipment data. But the impact toughness data is better after the welding current and the welding voltage are reduced, only two numerical values in 10 data of No. 11 are lower than qualified indexes, and the rest numerical values are about 100. And the serial numbers 11# and 12# adjust the cold wire feeding speed and the distance between the main wires to be smaller, and then the forming effect is more excellent.
4. Evaluation of welding Process
Ideal welding standard parameters are screened out through a welding test, and as shown in table 5, an evaluation test is carried out according to the requirements of NB/T47014-2011 'evaluation of welding process of pressure-bearing equipment' in combination with the technical requirements in the product manufacturing process, and the physicochemical performance is detected.
TABLE 5 weld Specification parameters
Note: 1. preheating before overlaying is more than or equal to 165 ℃, and the interlayer temperature in the welding process is 230 ℃.
2. DHT was performed immediately after build-up welding: 300 ℃ and 350 ℃ for 2 h.
3. The distance between the main wire 1 and the main wire 2 is 15 mm. The rod elongation was 35 mm.
Ultrasonic detection is carried out on deposited metal after surfacing, NB/T47013.3-2015, grade I is qualified, and the situation that the sample is waste due to the fact that the sample is positioned at a welding defect position when a subsequent physicochemical performance test is carried out is avoided. The physical and chemical property test results are as follows:
1) the deposited metal was analyzed and shown in Table 6.
Table 6 deposited metal chemistry (Wt%) (min
As can be seen from the above Table 6, the analysis results of the weld overlay deposited metal all meet the product requirements, and the content of S, P impurity elements is low. The X coefficient was calculated to be (10 × 30+5 × 10+4 × 20+50) × 10-24.8PPm is less than or equal to 12 PPm; and (3) test results: and (4) passing.
2) Tensile test
The results of the round bar drawing test at room temperature and elevated temperature (454 ℃) are shown in tables 7 and 8.
TABLE 7 tensile test results for round bars at room temperature
As can be seen from the above table 7, the room temperature tensile test result is 610-682 MPa, and the strength value is moderate. And (3) test results: and (4) passing.
TABLE 8454 ℃ high temperature round bar tensile test results
As can be seen from the above table 8, the yield strength results of the high-temperature tensile test are 390-447 MPa, and the requirements of being more than or equal to 339.8MPa are met. And (3) test results: and (4) passing.
3) Guided bending test
Under the Min.PWHT and Max.PWHT states, the welding joint full section bending test, sample 4. And (3) test results: no cracks and pass results are shown in FIG. 3.
4) Charpy V-notch impact test results are shown in Table 9.
TABLE 9 weld joint toughness test results
As can be seen from the above table 9, the impact value is 82-285J, the requirement of the impact value is completely met, and the average value of three samples is more than or equal to 54; the minimum value of one sample is more than or equal to 48. And (3) test results: and (4) passing.
5) Hardness test
The hardness test tests the hardness of the weld joint, the base metal and the heat affected zone, and the test results are shown in Table 10 below.
TABLE 10 hardness test results
As can be seen from Table 10 above, the hardness test results are 202-224 HV10The measured values are all less than or equal to 248HV 10. And (4) testing results: and (4) passing.
6) Tempering embrittlement tendency evaluation test (Min. PWHT)
TABLE 11 evaluation test results of embrittlement tendency of weld center tempering
| VTr54 | -39.7℃ |
| VTr'54 | -42.8℃ |
| ΔVTr54＝∣VTr54-VTr'54∣ | 0℃ |
| VTr54+3×ΔVTr54 | -39.7 |
TABLE 12 Heat-affected zone temper embrittlement tendency evaluation test results
| VTr54 | -89℃ |
| VTr'54 | -61.2℃ |
| ΔVTr54＝∣VTr54-VTr'54∣ | 27.7℃ |
| VTr54+3×ΔVTr54 | -5.9 |
As can be seen from the above tables 11 and 12, the test results both satisfy the requirement that VTr54+3 XΔ VTr54 is less than or equal to 0 ℃. And (4) testing results: and (4) passing.
5. And (3) analyzing test results:
(1) chemical components: from the results of the chemical composition detection of the deposited metal, each element was within a predetermined value range, and the content of the impurity element S, P was low.
(2) Tensile property: the tensile test results of the welding joint all meet the requirements of technical conditions, and the strength value is moderate.
(3) Bending property: through a lateral bending test, the base metal, the heat affected zone and the welding seam have no defects, the tensile surface is smooth and complete, the deformation is uniform and consistent, and the toughness and the plasticity are good.
(4) Impact toughness: from the impact result, the impact values of the welding line and the heat affected zone at the temperature of-30 ℃ can completely meet the requirements of technical conditions, and a certain reserve amount is reserved.
(5) And (3) hardness testing: from the results of the hardness test, the measured values all meet the requirements of the specifications, indicating that no hardened zone is present throughout the welded joint.
(6) Tempering embrittlement tendency evaluation test: from the calculation results of detection values of the weld joint and the heat affected zone before and after the step cooling, the requirements of technical conditions on the tempering embrittlement prevention tendency of the material are met.
Claims (10)
1. The surfacing manufacturing method of the lug boss of the hydrogenation reactor made of vanadium steel is characterized by comprising the following steps: preheating the vanadium-added steel base material to be more than or equal to 165 ℃, then performing surfacing welding on the surface of the vanadium-added steel base material by adopting composite cold wire submerged arc welding, performing postweld heat treatment after surfacing welding is completed, and cooling to obtain a surfacing welding boss;
the composite cold wire submerged arc welding is characterized in that two identical three-wire welding guns are adopted for welding at the same time, and welding wires of each welding gun are 1 hot wire and 2 cold wires; the two welding guns are perpendicular to the surface of the vanadium-added steel base metal, are respectively arranged on two sides of the same welding line to be welded, and are arranged side by side in the width direction of the welding line to be welded;
on the welder: the projection points of the front end points of the hot wires and the front end points of the two cold wires on the surface of the workpiece to be welded are positioned on the same straight line, the straight line is parallel to the welding direction, and the projection points of the front end points of the hot wires are positioned between the projection points of the front end points of the two cold wires; the hot wire is communicated with a power supply and is called a main wire, and the two cold wires are not communicated with the power supply and are called auxiliary wires; in the welding direction, the front cold wire is a front auxiliary wire, and the rear cold wire is a rear auxiliary wire;
the technological parameters adopted by surfacing are as follows: the welding speed of the two main wires is 450-550mm/min, the welding current is 500-580A, and the arc voltage is 30-35V; controlling the wire feeding speed of the front auxiliary wire of each main wire to be 200 +/-20 mm/min, and controlling the wire feeding speed of the rear auxiliary wire to be 1500 +/-50 mm/min; the interlayer temperature is 165-250 ℃; the maximum linear energy was 27.1 KJ/cm.
2. The overlaying manufacturing method for the lug boss of the vanadic steel hydrogenation reactor according to claim 1, characterized by comprising the following steps: the cold wire and the hot wire are made of the same material and are both US-521H welding wires; the flux was PF 500.
3. The overlaying manufacturing method for the lug boss of the vanadic steel hydrogenation reactor according to claim 1, characterized by comprising the following steps: the diameter of the hot wire is 4.0mm, and the diameter of the cold wire is 2.0 mm.
4. The overlaying manufacturing method for the lug boss of the vanadic steel hydrogenation reactor according to claim 1, characterized by comprising the following steps: on the welding gun, the two cold wires are symmetrically arranged relative to the extension axis of the hot wire, the extension axis of the cold wire and the extension axis of the hot wire form an included angle, the included angle enables the hot wire and the two cold wires to be gathered towards the generation direction of electric arcs, and the shortest distance from the front end point of the cold wire to the surface of the hot wire is 2-3 mm.
5. The overlaying manufacturing method for the lug boss of the vanadic steel hydrogenation reactor according to claim 1, characterized by comprising the following steps: controlling the wire feeding speed of the front auxiliary wire to be 200 mm/min; the wire feeding speed of the rear auxiliary wire is 1500 mm/min.
6. The overlaying manufacturing method for the lug boss of the vanadic steel hydrogenation reactor according to claim 1, characterized by comprising the following steps: the welding speed of the two main wires is 500mm/min, the welding current is 540-550A, and the arc voltage is 33V; preferably, the welding current for one main wire is 540A and the welding current for the other main wire is 550A.
7. The overlaying manufacturing method for the lug boss of the vanadic steel hydrogenation reactor according to claim 1, characterized by comprising the following steps: in the welding process, the rod elongation of the hot wire is 35 +/-2 mm, and the distance between the two main wires is 15 mm.
8. The overlaying manufacturing method for the lug boss of the vanadic steel hydrogenation reactor according to claim 1, characterized by comprising the following steps: the material of the base metal of the hydrogenation reactor made of the vanadium adding steel is 12Cr2Mo 1V.
9. The method for manufacturing the boss of the hydrogenation reactor for the vanadic steel according to any one of claims 1 to 8, wherein the thickness of the build-up welding is 30 to 45 mm.
10. The method for manufacturing the boss surfacing welding of the hydrogenation reactor for the vanadium adding steel according to any one of claims 1 to 9, wherein the post-welding heat treatment is dehydrogenation treatment or stress relief treatment; preferably, the dehydrogenation treatment is carried out at 300-350 ℃ for at least 2 h.
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