Multipurpose submerged arc automatic welding sintering flux, preparation method and application thereof

Abstract

The application relates to the technical field of welding materials, and discloses a multipurpose submerged arc automatic welding sintering flux, a preparation method and application thereof, the chemical components of the flux include the following components in percentage by mass: CaF2: 20.95%-21.05%, MgO: 35.95%-36.05%, SiO2: 18.95%-19.05%, Al2O3: 18.95%-19.05%, CaO: 1.95%-2.05%, K2O+Na2O: 2.95%-3.05%, and the impurity content satisfies the following conditions: Mn<=1.5%, Si<=1.5%, S<=0.05%, and P<=0.05%. The flux can be used in combination with various welding wires, the weld appearance is not only beautiful, but also easy to remove slag, and excellent mechanical properties and low-temperature toughness can be obtained, so that the welding requirements of multiple fields such as thermal power boilers, bridge structural parts, building structural steel, hydropower pressure steel pipes and the like can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding materials, in particular, to a multipurpose submerged arc automatic welding sintered flux, a preparation method and application thereof. BACKGROUND

[0002] In the field of submerged arc automatic welding, sintered flux as a key auxiliary material in the welding process directly determines the weld quality, welding efficiency and applicable scenarios, and is widely used in major engineering fields such as thermal power boilers, bridge structural components, building structural steel, and hydroelectric pressure steel pipes.

[0003] However, the existing sintered flux generally has the limitation of "single welding wire adaptation": most products can only match 1-2 specific chemical components of submerged arc welding wire, and if faced with welding requirements of different base materials, the flux needs to be frequently replaced to adapt to the corresponding welding wire. This not only increases the inventory cost and replacement time of the flux, but also easily causes mixing due to flux residue, leading to quality defects such as weld slag inclusion and porosity, and in severe cases, may cause construction safety accidents. For example, the flux used for thermal power boiler welding is usually difficult to adapt to the welding wire required for bridge structural steel, and special flux needs to be purchased, which greatly reduces the production flexibility; and in hydroelectric pressure steel pipe welding, if the welding wire and flux combination needs to be adjusted multiple times due to insufficient flux adaptability, the construction period will be significantly prolonged.

[0004] In addition, although some existing fluxes attempt to expand the adaptation range, they often sacrifice other performance, such as some fluxes that adapt to multiple welding wires, resulting in decreased arc stability, poor weld formation, or difficulty in deslagging, making it difficult to balance "multipurpose" and "welding quality"; at the same time, due to unreasonable component design, the mechanical properties of the welds fluctuate greatly when adapting to different welding wires, especially the low-temperature toughness is insufficient, and cannot meet the strength and toughness requirements in multiple scenarios.

[0005] Therefore, developing a multipurpose submerged arc automatic welding sintered flux that can stably adapt to multiple welding wires and meet welding quality standards is crucial to solving current industry pain points and improving welding efficiency and engineering applicability. SUMMARY

[0006] The present application aims to provide a multipurpose submerged arc automatic welding sintered flux to solve the problem of "single welding wire adaptation" of existing sintered fluxes and achieve stable adaptation to multiple different welding wires.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] The utility model provides a multipurpose submerged arc automatic welding sintered flux, and the chemical composition for preparing the flux comprises, in percentage by mass, CaF2: 20.95%~21.05%, MgO: 35.95%~36.05%, SiO2: 18.95%~19.05%, Al2O3: 18.95%~19.05%, CaO: 1.95%~2.05%, K2O+Na2O: 2.95%~3.05%, and the impurity content satisfies: Mn<=1.5%, Si<=1.5%, S<=0.05%, P<=0.05%.

[0009] Further, the raw materials for preparing the flux comprise, in percentage by mass, fluorite: 26.4%, magnesite: 36.6%, alumina: 16.3%, wollastonite: 6.1%, clay: 6.1%, atomized ferrosilicon: 1.4%, electrolytic manganese: 1.0%, and dehydrated potash feldspar: 6.1%.

[0010] The fluorite is selected from a low-sulfur and low-phosphorus grade (S<=0.02%, P<=0.01%), which mainly serves as the main source of CaF2 and plays a role in slagging, purifying the weld, improving the purity of the weld, and improving the overall basicity of the flux. However, since the flux needs to be matched with a variety of alloy components of the welding wire, the basicity of the flux needs to be strictly controlled. Therefore, the added amount of CaF2 in the present application is 21%. With this amount, the flux matched with the welding wire with a variety of alloy components has excellent performance, and the weld forming is not narrow, the slag shell is not hard, and the flux itself does not have the adverse effects such as being difficult to remove the slag.

[0011] The main source of MgO is sintered magnesite, which is the core slagging component of the flux and plays a basic role in the slagging process of the flux. Specifically, the thickness parameter and flow characteristics of the slag shell formed during the welding process of the flux are mainly controlled by the content and ratio of the MgO component to achieve precise control of the performance of the slag shell. The flowability of the slag shell is a key factor affecting the purity of the weld, and the optimization of its performance can directly reduce the generation of common defects such as slag inclusion and porosity in the weld, thereby ensuring the welding quality and mechanical properties of the weld. In the present application, the added amount of MgO is set to 36%, which can effectively balance the overall basicity of the flux and the slagging component system. Based on this design, the flux can have excellent slag removal performance and suitable slag shell flowability while maintaining a medium basicity level.

[0012] The alumina is selected from an industrial pure grade raw material with Al2O3>=98%, and the amount of 16.3% corresponds to an Al2O3 content of about 19% in the flux. On the one hand, it can enhance the chemical stability of the molten slag and ensure consistent molten slag protection effect during welding. On the other hand, it can be used as a heterogeneous nucleation core for weld crystallization to refine the weld grains.

[0013] Wollastonite adopts natural low-impurity grade, and the proportion of 6.1% can supplement about 2.0% CaO, which can avoid the abnormal increase of the basicity of the welding flux due to the too high content of CaO. If the basicity of the welding flux is too high, it is easy to cause the decrease of the weld toughness, the increase of the risk of cold cracks after welding and other adverse effects, so it is necessary to strictly control the addition amount to avoid the above problems; on the other hand, on the basis of ensuring the stability of the basicity of the welding flux and no adverse effects, the dosage of CaO can effectively enhance the resistance to large current of the welding flux, so that the welding flux can still maintain stable arc shape and molten pool protection effect under large current welding working condition, avoiding the problems of too fast burning loss of the welding flux, poor weld forming and other problems caused by too large current, thereby adapting to the higher efficiency of welding operation demand.

[0014] Atomized ferrosilicon can form "manganese-silicon combined deoxidation" with electrolytic manganese, silicon preferentially reacts with oxygen to form SiO2 into the slag, reducing the oxidation of the weld metal, and the fine particle size design ensures that it is fully mixed with other raw materials, avoiding incomplete local deoxidation and improving the low-temperature toughness of the weld. And the manganese-silicon that does not participate in deoxidation can also participate in the supplement of the composition of the welding wire, thereby reducing the burn loss of manganese-silicon in the weld and improving the strength and toughness of the weld. At the same time, Mn can react with S element in the weld to form MnS (melting point 1610℃, higher than the welding temperature), and MnS can reduce the risk of hot cracking by separating from the slag, and a small amount of manganese solid solution in the weld metal can improve the yield strength without affecting the elongation.

[0015] Dehydrated potassium feldspar selects raw materials with water content ≤0.5% and K2O+Na2O≥12%, and the dosage of 6.1% can provide about 3.0% K2O and Na2O, which cooperates with CaF2 and MgO to adjust the basicity of the welding flux, enhances the arc conductivity, ensures that the arc voltage fluctuation is ≤±1V during welding, and there is no arc breaking or deflection phenomenon. The low water content design can also prevent the welding flux from absorbing moisture after drying, prolonging the shelf life.

[0016] The application provides a matching welding wire for the multipurpose submerged arc automatic welding sintering flux, which comprises at least any one of H08CrMoVA, XY-S65R, XY-S80A, EF3, H08Mn2MoA and H08CrMoG.

[0017] When the multipurpose submerged arc automatic welding sintering flux is used for matching the welding wire H08CrMoVA, the welding process adopts multi-layer and multi-pass cladding metal welding, and the welding parameters are as follows: current: 450-500 A, voltage: 25-30 V, welding speed: 350-450 mm / min, interpass temperature: 230-250 DEG C, and heat treatment is carried out after welding, 12 passes and 6 layers.

[0018] The multipurpose submerged arc automatic welding sintering flux of the application is used for matching the welding wire XY-S65R, the welding process adopts multi-layer multi-pass metal deposition welding, and the welding parameters are as follows: current: 550-620A, voltage: 25-35V, and welding speed: 350mm / min-450mm / min. A total of 10 passes and 5 layers are welded, the inter-pass temperature is 170-180 DEG C, and heat treatment can be selectively performed after welding.

[0019] The multipurpose submerged arc automatic welding sintering flux of the application is used for matching the welding wire XY-S65R, the welding process adopts multi-layer multi-pass metal deposition welding, and the welding parameters are as follows: current: 550-620A, voltage: 25-35V, and welding speed: 350mm / min-450mm / min. A total of 10 passes and 5 layers are welded, the inter-pass temperature is 170-180 DEG C, and heat treatment can be selectively performed after welding.

[0020] The multipurpose submerged arc automatic welding sintering flux of the application is used for matching the welding wire EF3, the welding process adopts multi-layer multi-pass metal deposition welding, and the welding parameters are as follows: current: 480-550A, voltage: 23-30V, and welding speed: 380mm / min-450mm / min. A total of 13 passes and 6 layers are welded, the inter-pass temperature is 230-250 DEG C, and heat treatment is performed after welding.

[0021] The multipurpose submerged arc automatic welding sintering flux of the application is used for matching the welding wire H08Mn2MoA, the welding process adopts multi-layer multi-pass metal deposition welding, and the welding parameters are as follows: current: 580-650A, voltage: 28-35V, and welding speed: 380mm / min-450mm / min. A total of 5 layers and 10 passes are welded, and the inter-pass temperature is 180-200 DEG C.

[0022] The multipurpose submerged arc automatic welding sintering flux of the application is used for matching the welding wire H08CrMoG, the welding process adopts multi-layer multi-pass metal deposition welding, and the welding parameters are as follows: current: 580-650A, voltage: 28-35V, and welding speed: 380mm / min-450mm / min. A total of 10 passes and 5 layers are welded, the inter-pass temperature is 280-300 DEG C, and heat treatment is performed after welding.

[0023] The application further provides a preparation method of the multipurpose submerged arc automatic welding sintering flux.

[0024] S1: screening: screening the raw materials in claim 2 according to the proportion, and controlling the uniformity of the particle size of the raw materials;

[0025] S2: wet mixing: wet mixing the screened raw materials by fully mixing the screened raw materials and adding water glass.

[0026] S3 granulation: the wet mixed mixture is put into a granulator for granulation, and the solder particle size is controlled;

[0027] S4 drying: the granulated solder is dried;

[0028] S5 high-temperature sintering: the dried solder is high-temperature sintered;

[0029] S6 sorting and packaging: the sintered solder is sorted and then packed in a moisture-proof packaging bag.

[0030] Further, in step S2, the water glass is sodium water glass with a modulus of 2.5-3.0, and the added amount of the water glass is 8%-12% of the total mass of the raw materials.

[0031] Further, in step S3, the solder particle size is controlled at 10-50 mesh.

[0032] Further, in step S4, the drying temperature is set to 230-250 DEG C.

[0033] Further, in step S5, the sintering temperature is set to 650-690 DEG C.

[0034] Further, in step S5, the sintering time is not more than 2 hours.

[0035] Compared with the prior art, the present application has the following beneficial effects:

[0036] (1) The multipurpose submerged arc automatic welding sintering flux provided by the present application can stably adapt to submerged arc welding wires of various chemical compositions (such as H08CrMoVA, XY-S65R, XY-S80A, etc.), without the need to frequently replace the flux due to different base materials, thereby reducing the inventory cost and replacement time loss of the flux and avoiding the problem of mixed materials caused by incomplete replacement of the flux; at the same time, thanks to the multi-wire adaptability and balanced performance, the flux can be directly applied to submerged arc automatic welding operations in multiple fields such as thermal power boilers, bridge structural components, building structural steel, and hydroelectric pressure steel pipes, thereby significantly improving the application flexibility and economy.

[0037] (2) The present application ensures that the molten pool fluidity is appropriate, the weld formation is beautiful, and the slag shell is easy to fall off through precise proportioning of slag-making components such as CaF2:21% and MgO:36%, thereby significantly improving the welding efficiency; at the same time, relying on the manganese-silicon combined deoxidation design of atomized ferrosilicon:1.4% and electrolytic manganese:1.0%, the welds adapted to different welding wires all have excellent mechanical properties, which can meet the engineering requirements of thermal power boilers, hydroelectric pressure steel pipes, and other low-temperature or cold-hot alternating working conditions, thereby reducing the risk of low-temperature cracking of the welds. DETAILED DESCRIPTION

[0038] For a further understanding of the present application, preferred embodiments thereof will be described in conjunction with the accompanying drawings, it being understood, however, that the description is made only by way of preference for the purposes of exemplification and is not intended to limit the present application as defined by the claims.

[0039] Example 1

[0040] The present embodiment provides a multipurpose submerged arc automatic welding sintering flux, which comprises, in terms of mass percentage, CaF2: 21%, MgO: 36%, SiO2: 19%, Al2O3: 19%, CaO: 2.0%, K2O+Na2O: 3.0%, and impurity content satisfies: Mn≤1.5%, Si≤1.5%, S≤0.05%, P≤0.05%.

[0041] The raw materials for preparing the flux comprise, in terms of mass percentage, fluorite: 26.4%, magnesite: 36.6%, alumina: 16.3%, wollastonite: 6.1%, clay: 6.1%, atomized ferrosilicon: 1.4%, electrolytic manganese: 1.0%, and dehydrated potash feldspar: 6.1%.

[0042] The preparation steps are as follows:

[0043] S1: screening: the above raw materials are screened according to the ratio, and the particle size of the raw materials is controlled to be uniform;

[0044] S2: wet mixing: the screened raw materials are mixed uniformly, and sodium water glass with a modulus of 2.8 is added for wet mixing, and the amount of the sodium water glass added is 10% of the total mass of the raw materials;

[0045] S3: granulation: the wet-mixed mixture is put into a granulator for granulation, and the particle size of the flux is controlled to be 30 mesh;

[0046] S4: drying: the granulated flux is dried at a temperature of 240℃;

[0047] S5: high-temperature sintering: the dried flux is subjected to high-temperature sintering at a temperature of 680℃ for two hours;

[0048] S6: sorting and packaging: the sintered flux is sorted and packed in a moisture-proof packaging bag.

[0049] Example 2

[0050] The present embodiment provides an application of the flux prepared in the above example 1.

[0051] The embodiment selects a welding wire with a brand H08CrMoVA to be used in combination with the flux of the embodiment 1 for welding a 12Cr1MoV steel, which is a 1-1.25Cr-0.5MoV pearlite series plus vanadium heat-resistant steel, wherein the chemical composition of the welding wire is shown in Table 1.

[0052] Table 1 Chemical composition of H08CrMoVA welding wire

[0053]

[0054] The welding process adopts multi-layer and multi-pass cladding metal welding, and the welding parameters are: current: 450A, voltage: 25V, welding speed: 350mm / min, interpass temperature: 230℃, and heat treatment is performed after the welding is completed. The weld surface is uniformly smooth without defects such as undercut and porosity; the deslagging performance is excellent, and the test results are shown in Table 2.

[0055] Table 2 Test results of the embodiment 2

[0056]

[0057] As shown in Table 2, after the heat treatment, the mechanical properties of the weld area are excellent: the tensile strength R m is 616MPa (satisfying the requirement of low-alloy high-strength steel), the yield strength Rp 0.2 is 525MPa (ensuring the carrying capacity), the elongation after fracture A is 25.0% (good plasticity); the room temperature impact value is 198-219J (the average value is about 209J), and the 0℃ impact value is 158-151J (the average value is about 155J), which are all higher than the conventional engineering requirements, and are suitable for the welding of structures such as thermal power stations and synthetic chemical containers.

[0058] Embodiment 3

[0059] The embodiment provides an application of the flux prepared in the above embodiment 1.

[0060] This embodiment selects the welding wire with the brand of XY-S65R to be used in combination with the flux of Example 1 for welding 13MnNiMoR base material, which is a kind of low alloy high strength quenched and tempered pressure vessel steel, and the core positioning is to be used for manufacturing large pressure vessels (such as storage tanks, reactors, boiler drums, etc.) bearing medium-high pressure, low temperature or dynamic load, which belongs to special steel materials with extremely high requirements for safety and toughness in engineering field. It can also be used for welding SA533B, which is a special quenched and tempered steel for high pressure, low temperature and high safety requirement pressure vessel design, and its core advantages are "balance of high strength and high toughness" and "excellent welding performance", especially in the field of nuclear power, it becomes the key material of reactor pressure vessel. Compared with the standard steel grade in China (such as 13MnNiMoR), SA533B pays more attention to international universality and nuclear level working condition adaptability, and its production and inspection need to fully comply with ASME standard, and the requirements for quality traceability and purity are higher. It can also be used for welding SA-533GRBCL2 steel grade, which is a steel plate equivalent to domestic 16MnD5 steel for pressure vessels in American standard. The chemical composition of XY-S65R welding wire is shown in Table 3.

[0061] Table 3 Chemical composition of XY-S65R welding wire

[0062]

[0063] The welding process adopts multi-layer and multi-pass cladding metal welding, and the welding parameters are: current: 620 A, voltage: 35 V, welding speed: 450 mm / min. A total of 10 passes, 5 layers, interpass temperature 180℃, and after welding, heat treatment can be selectively performed. The welded joint surface after welding is smooth, easy to remove slag, and free of cracks or slag inclusion defects, and the test results are shown in Table 4.

[0064] Table 4 Test results of Example 3

[0065]

[0066] As shown in Table 4, after testing, the flux prepared by the application is used in combination with XY-S65R welding wire, and in the as-welded state (without heat treatment): the tensile strength R m reaches 718 MPa (high strength reserve), the yield strength R p0.2 is 624 MPa, the elongation A% after fracture is 25.5%, the impact value at-10℃ is 121-122 J (the average is about 121.5 J), and the impact value at-20℃ is 120-120 J (the average is about 120 J), which shows that the welded joint still maintains good toughness at-20℃ low temperature, and is suitable for pressure vessels and heads, large low temperature storage tanks, high pressure chemical reactors, and fields such as drums and headers of super-high pressure boilers.

[0067] After heat treatment (615℃x3h), R mto 665 MPa, R p0.2 to 586 MPa (slightly reduced strength but more matching to base material), elongation A% of 26.5% (improved plasticity); -10℃ impact value of 158-140 J (average about 149 J), -20℃ impact value of 153-145 J (average about 149 J), impact toughness is further optimized, suitable for higher low temperature toughness requirement scenarios (such as service below -20℃).

[0068] After long time heat treatment (620℃x3.5h / 10hr), the strength is slightly reduced (R m : 651-629 MPa), but the -20℃ impact value is still maintained at 168-185 J (average ≥176 J), proving that the weld joint still has reliable performance after certain heat aging.

[0069] Example 4

[0070] The embodiment provides an application of the flux prepared in the above example 1.

[0071] The embodiment selects a welding wire with a brand of XY-S80A to be used in combination with the flux of example 1, and is used for welding 690 special steel plates for water and electricity of Q690SD, Q690SE and WSD690E, wherein the 690 steel for water and electricity refers to a water and electricity steel with a yield strength of 690 MPa, and is mainly used for manufacturing key components such as water and electricity pressure steel pipes, and the chemical components of the welding wire are shown in table 5.

[0072] Table 5 Chemical components of the welding wire XY-S80A

[0073]

[0074] The welding process adopts multi-layer and multi-pass cladding metal welding, and the welding parameters are as follows: current: 600 A, voltage: 33 V, welding speed: 370 mm / min. A total of 10 passes, 5 layers, interpass temperature 150℃, after welding, 200℃ heat preservation for 2 hours is carried out for hydrogen removal treatment, the welded joint after welding is formed beautiful, easy to remove slag, no hydrogen cracking defects, and the detection results are shown in table 6.

[0075] Table 6 Detection results of example 4

[0076]

[0077] As shown in table 6, the tensile strength R m is 857 MPa (ultra-high strength, meeting the demand of high pressure equipment), the yield strength R p0.2The tensile strength Rm is 712 MPa, the elongation A% is 21.0% (considering the strength and certain plasticity), the impact value at -40 DEG C is 77-87 J (the average is about 82 J), and the performance fully meets the relevant requirements of the 690 high-strength steel welding material in the DL / T541-2010 "Hydropower and Water Conservancy Engineering Pressure Steel Pipe Manufacturing, Installation and Acceptance Specification", and the combination can also be applied to the welding operation of the corresponding strength of the marine engineering.

[0078] Example 5

[0079] The embodiment provides an application of the welding flux prepared in the above example 1.

[0080] The embodiment selects a welding wire with a brand EF3, and is used in combination with the welding flux in the example 1 to weld the Gr.C steel plate, the Gr.D steel plate and the A533 steel plate in the ASTM A302 standard, wherein the Gr.C steel plate and the Gr.D steel plate are low-alloy high-strength steels, the A533 steel plate is a low-alloy steel for nuclear pressure vessels, and all the three have high strength and good toughness. The combination of the welding wire and the welding flux can also be used for welding of structural steels with a tensile strength greater than 620 MPa, and the chemical components of the welding wire are shown in Table 7.

[0081] Table 7 Chemical components of the EF3 welding wire

[0082]

[0083] The welding process adopts multi-layer and multi-pass cladding metal welding, and the welding parameters are as follows: current 480 A, voltage 23 V and welding speed 380 mm / min. A total of 13 passes and 6 layers are welded, the interpass temperature is 230 DEG C, and after the welding is completed, the conventional heat treatment is performed. The welded joint has a smooth surface, the deslagging is smooth, and there is no welding defect. The detection results are shown in Table 8.

[0084] Table 8 Detection results of the example 5

[0085]

[0086] As shown in Table 8, after the heat treatment at 615 DEG C*9h, the tensile strength R m is 685 MPa (matching the strength of the base material), the yield strength R p0.2 is 590 MPa, and the elongation A% is 23.0%. The impact value at 0 DEG C is 114-121 J (the average is about 117.5 J) and 118 J (the whole is greater than or equal to 114 J), and the welding meets the relevant pressure vessels under the long-time heat treatment.

[0087] Example 6

[0088] The embodiment provides an application of the welding flux prepared in the above example 1.

[0089] In this embodiment, welding wire of grade H08Mn2MoA is used in combination with the flux of Example 1. The base material used for welding is mainly B610CF, a steel grade with a tensile strength between 610-740MPa, which is widely used in various fields. In the power industry, it can be used to manufacture pressure-bearing components of power plant boilers and various structural components of thermal power units; in the construction machinery industry, it is commonly used to manufacture components such as booms, jibs, and frames of loaders, excavators, and cranes; in the shipbuilding industry, it can be used to manufacture components such as hull structures, decks, and bulkheads; in addition, it can also be used in automobile manufacturing, such as manufacturing key structural components such as car frames and chassis. The chemical composition of H08Mn2MoA welding wire is shown in Table 9.

[0090] Table 9 Chemical Composition of H08Mn2MoA Welding Wire

[0091]

[0092] The welding process employed multi-layer, multi-pass cladding metal welding. The welding parameters were: current: 600A, voltage: 28V, welding speed: 400mm / min. A total of 5 layers and 10 passes were used, with an interpass temperature of 200℃. After welding, the weld quality was good, and the inspection results are shown in Table 10.

[0093] Table 10 Detection results of Example 6

[0094]

[0095] As shown in Table 10, its tensile strength R m 652 MPa, yield strength R p0.2 The weld strength is 581 MPa, and the elongation after fracture (A%) is 27.0% (high plasticity). The impact value at -20℃ is 176-168 J (average about 172 J), and the impact value at -40℃ is 168-129 J (average about 149 J), indicating that the weld still has sufficient toughness at a low temperature of -40℃, making it suitable for welding bridges or low-temperature pressure pipelines in northern regions.

[0096] Example 7

[0097] This embodiment provides an application of the flux prepared in Embodiment 1 above.

[0098] In this embodiment, welding wire of grade H08CrMoG is used in combination with the flux of Example 1 for welding 1.25Cr-0.5Mo series pearlitic heat-resistant steels without vanadium, such as 12CrMo, 12CrMoG, 15CrMo, 15CrMoG, and 15CrMoR. The chemical composition of the welding wire is shown in Table 11.

[0099] Table 11 Chemical Composition of H08CrMoG Welding Wire

[0100]

[0101] The welding process employs multi-layer, multi-pass cladding metal welding with the following parameters: 620A, voltage: 30V, and welding speed: 440mm / min. A total of 10 passes (5 layers) are welded, with an interpass temperature of 300℃. After welding, heat treatment is performed. The resulting weld has a beautiful shape and is easy to remove slag. The test results are shown in Table 12. It exhibits good mechanical properties, and all indicators meet engineering requirements, making it suitable for welding structures such as thermal power plants and synthetic chemical containers.

[0102] Table 12 Detection Results of Example 7

[0103]

[0104] In summary, the above embodiments cover welding scenarios for various welding wires, ranging from conventional high-strength steel (H08Mn2MoA, H08CrMoVA) to corrosion-resistant steel (XY-S65R, XY-S80A) and heat-resistant steel (H08CrMoG). By adjusting the welding process parameters (current / voltage / interpass temperature) and heat treatment regime, the goals of aesthetically pleasing weld formation, easy slag removal, and excellent mechanical properties and impact toughness have been achieved. This verifies the wide applicability and reliability of the multi-purpose submerged arc automatic welding sintering flux and different welding wire combinations provided by this invention.

Claims

1. A multi-purpose submerged arc automatic welding sintering flux, characterized in that, The components include the following mass percentages: CaF2: 20.95%~21.05%, MgO: 35.95%~36.05%, SiO2: 18.95%~19.05%, Al2O3: 18.95%~19.05%, CaO: 1.95%~2.05%, K2O+Na2O: 2.95%~3.05%, and the impurity content meets the following requirements: Mn≤1.5%, Si≤1.5%, S≤0.05%, P≤0.05%. The flux is intended for use alone in conjunction with at least one type of welding wire, including H08CrMoVA, XY-S65R, XY-S80A, EF3, H08Mn2MoA, and H08CrMoG. in: The chemical composition of H08CrMoVA is C: 0.087%, Si: 0.17%, Mn: 0.53%, S: 0.007%, P: 0.006%, Cr: 1.15%, Mo: 0.57%, V: 0.184%, with the balance being Fe and other uncontrollable impurities. The chemical composition of XY-S65R is: C: 0.08%, Si: 0.04%, Mn: 1.84%, S: 0.006%, P: 0.01%, Ni: 0.95%, Mo: 0.31%, Cr: 0.25%, Cu: 0.17%, Ti: 0.11%, with the balance being Fe and other uncontrollable impurities; The chemical composition of XY-S80A is: C: 0.07%, Si: 0.04%, Mn: 1.67%, S: 0.003%, P: 0.06%, Ni: 2.67%, Mo: 0.62%, Cr: 0.40%, Cu: 0.03%, Al: 0.01%, with the balance being Fe and other uncontrollable impurities; The chemical composition of EF3 is: C: 0.09%, Si: 0.12%, Mn: 2.21%, S: 0.007%, P: 0.011%, Ni: 0.90%, Mo: 0.52%, V: 0.002%, with the balance being Fe and other uncontrollable impurities; The chemical composition of H08Mn2MoA is as follows: C: 0.08%, Si: 0.16%, Mn: 1.66%, S: 0.004%, P: 0.009%, Ni: 0.03%, Mo: 0.54%, V: 0.003%, Ti: 0.12%, with the balance being Fe and other uncontrollable impurities. The chemical composition of H08CrMoG is as follows: C: 0.14%, Si: 0.20%, Mn: 0.68%, S: 0.003%, P: 0.012%, Cr: 1.36%, Mo: 0.55%, V: 0.004%, Cu: 0.06%, with the balance being Fe and other uncontrollable impurities.

2. The method for preparing a multi-purpose submerged arc automatic welding sintering flux according to claim 1, characterized in that, Includes the following steps: S1 Ingredient Sieving: The raw materials required for preparing the flux according to claim 1 are sieved according to the proportion to control the uniformity of the raw material particle size; S2 Mixing and Wet Mixing: The sieved raw materials are thoroughly mixed and then water glass is added for wet mixing. S3 Granulation: The wet-mixed mixture is put into a granulator for granulation to control the flux particle size; S4 Drying: Drying the granulated flux; S5 High-temperature sintering: The flux is obtained after high-temperature sintering and drying; S6 Sorting and Packaging: The sintered flux is sorted and then packaged.

3. The application of the multi-purpose submerged arc automatic welding sintering flux according to claim 1, characterized in that, When using the matching welding wire H08CrMoVA, the welding process adopts multi-layer, multi-pass cladding metal welding. The welding parameters are: current: 450~500A, voltage: 25~30V, welding speed: 350mm / min~450mm / min, interpass temperature 230℃~250℃. After welding, heat treatment is performed. Welding is done in 12 passes, 6 layers.

4. The application of the multi-purpose submerged arc automatic welding sintering flux according to claim 1, characterized in that, When using the XY-S65R welding wire, the welding process adopts multi-layer, multi-pass cladding metal welding. The welding parameters are: current: 550~620A, voltage: 25~35V, welding speed: 350mm / min~450mm / min, a total of 10 passes, 5 layers, and interpass temperature 170℃~180℃. After welding, heat treatment can be selectively performed.

5. The application of the multi-purpose submerged arc automatic welding sintering flux according to claim 1, characterized in that, When using the XY-S80A welding wire, the welding process adopts multi-layer, multi-pass cladding metal welding. The welding parameters are: current: 550~600A, voltage: 25~33V, welding speed: 350mm / min~420mm / min, a total of 10 passes, 5 layers, interpass temperature 140℃~150℃, and hydrogen removal treatment at 200℃ for 2 hours after welding.

6. The application of the multi-purpose submerged arc automatic welding sintering flux according to claim 1, characterized in that, When using the matching welding wire EF3, the welding process adopts multi-layer and multi-pass cladding metal welding. The welding parameters are: current: 480~550A, voltage: 23~30V, welding speed: 380mm / min~450mm / min, a total of 13 passes, 6 layers, and interpass temperature 230℃~250℃. Heat treatment is performed after welding.

7. The application of the multi-purpose submerged arc automatic welding sintering flux according to claim 1, characterized in that, When using H08Mn2MoA welding wire, the welding process adopts multi-layer and multi-pass cladding metal welding. The welding parameters are: current: 580~650A, voltage: 28~35V, welding speed: 380mm / min~450mm / min, total number of layers: 5, total number of passes: 10, and interpass temperature: 180℃~200℃.

8. The application of the multi-purpose submerged arc automatic welding sintering flux according to claim 1, characterized in that, When using the matching welding wire H08CrMoG, the welding process adopts multi-layer and multi-pass cladding metal welding. The welding parameters are: 580~650A, voltage: 28~35V, welding speed: 380mm / min~450mm / min, a total of 10 passes, 5 layers, and interpass temperature 280℃~300℃. Heat treatment is performed after welding.

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