Bimetal explosion clad steel plate, butt joint method thereof and butt joint piece of bimetal explosion clad steel plate

Abstract

The invention discloses a bimetal explosion clad steel plate, a butt joint method thereof and a bimetal explosion clad steel plate butt joint piece. The bimetal explosion clad steel plate comprises a 316L stainless steel plate and a Q460 low-alloy high-strength steel plate which are composited through explosive welding. In the bimetal explosion cladding steel plate, the Q460 low-alloy high-strength steel plate is used as a base layer, and the 316L stainless steel plate is used as a cladding layer; and the bonding interface of the base layer and the covering layer is wavy. According to the bimetal explosion clad steel plate, the bimetal explosion clad steel plate is obtained through explosive welding, the manufacturing cost is low, and the bimetal explosion clad steel plate has the advantages of corrosion resistance, radiation resistance, high strength, high toughness and the like, and is wide in application range and high in economical efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of metal composite plates, and particularly relates to a bimetallic explosion composite steel plate, a butt joint method thereof, and a bimetallic explosion composite steel plate butt joint member. Background Art

[0002] The bimetallic explosion-welded stainless steel composite steel plate is a bimetallic composite material with carbon steel or stainless steel as the base and stainless steel composite on one or both sides. The production method of the explosion-welded composite steel plate is to place the prepared clad plate on the base plate, and then lay a layer of explosive on the clad plate. The instantaneous high pressure and high-speed impact energy generated by the explosion of the explosive are used to achieve the solid-state metallurgical bonding between metals. The explosion-welded composite steel plate produced by using the explosion welding technology will not change the chemical composition and physical state of the original materials. Therefore, according to actual needs, the materials to be composite can be separately processed into the best state required. The explosion-welded composite material can give full play to the characteristic advantages of the base layer and the clad layer materials. It can not only have the corrosion resistance or wear resistance and other characteristics of the clad layer material, but also have the excellent mechanical properties and weldability of the base layer material. Therefore, the bimetallic explosion-welded composite material is a multi-functional material.

[0003] The explosion welding composite of 316L stainless steel and Q460 low-alloy high-strength steel is an effective method to improve the material cost savings and can also improve the strength at the same time. However, there are still technical difficulties in the composite of 316L stainless steel and Q460 low-alloy high-strength steel: when the two materials are composite, the hot working properties of 316L stainless steel and Q460 low-alloy high-strength steel are quite different, and the hot working process is difficult. Due to the poor corrosion resistance of Q460 low-alloy high-strength steel, the metal at the welded joint of the composite material of 316L stainless steel and Q460 low-alloy high-strength steel has poor corrosion resistance due to the dilution effect of the base plate composition. In addition, the welding of the transition layer of the explosion composite steel plate has always been a technical difficulty in engineering construction. Cracks are likely to occur at the welded joint of the transition layer, which may lead to fracture in severe cases, and further affect the welding joint quality of the explosion composite steel plate. Therefore, in the whole process of welding the composite steel plate, both the appropriate welding materials should be selected to enable the materials at the transition layer to be mutually melted and avoid the generation of transition layer cracks, and the appropriate welding process parameters should be selected, and the welding technical difficulties will be overcome.

[0004] Among the equipment in the field of marine equipment manufacturing, the materials are required to have high strength, high corrosion resistance, nuclear radiation resistance, high plasticity, excellent low-temperature toughness and processing performance at the same time. The requirement of high strength can, on the one hand, reduce the thickness of the materials used and make the equipment lighter. Special requirements such as high plasticity and radiation resistance are convenient for the feasibility of equipment manufacturing on the one hand, and on the other hand, the equipment has excellent service safety performance and can prevent impacts and other events during use. Therefore, it is of great significance to develop a low-cost large-area bimetallic composite steel plate that has corrosion and radiation resistance, high strength and high toughness, good welding performance and service performance, so as to expand the application range of the composite steel plate, save raw material resources and reduce manufacturing costs. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a low-cost bimetallic explosion composite steel plate, its butt joint method, and a bimetallic explosion composite steel plate butt joint.

[0006] The technical solution adopted by the present invention to solve its technical problems is: to provide a bimetallic explosion composite steel plate, which includes a 316L stainless steel plate and a Q460 low-alloy high-strength steel plate composite by explosion welding; in the bimetallic explosion composite steel plate, the Q460 low-alloy high-strength steel plate is used as the base layer, and the 316L stainless steel plate is used as the cladding layer; the bonding interface between the base layer and the cladding layer is wavy.

[0007] In one embodiment, the Q460 low-alloy high-strength steel plate includes the following chemical components in mass percentages: 0.15% C, 0.34% Si, 1.41% Mn, 0.011% P, 0.0013% S, 0.023% Nb, 0.049 V, 0.003% Ti, 0.06% Cr, 0.02% Ni, 0.04% Cu, 0.008% Mo, 0.0044 N, and the rest is Fe and inevitable trace impurities in smelting.

[0008] In one embodiment, the 316L stainless steel plate includes the following chemical components in mass percentages: 0.019% C, 0.486% Si, 1.48% Mn, 0.028% P, 0.0066 S, 16.81% Cr, 10.08% Ni, 2.03% Mo, 0.012% N, and the rest is Fe and inevitable trace impurities in smelting.

[0009] In one embodiment, the thickness of the base layer is ≥8 mm, and the thickness of the cladding layer is 1 mm to 14 mm.

[0010] In one embodiment, in the explosion welding, the explosives used include powdered emulsion explosives and inert additives;

[0011] Heat treatment is carried out after explosive cladding: heat at 600°C ± 15°C, with a heating rate < 200°C / hour, hold the temperature, then cool in the furnace to 250°C ± 15°C, and then take out of the furnace and air-cool to room temperature.

[0012] The present invention also provides a butt joint method for a bimetallic explosion-clad steel plate, comprising the following steps:

[0013] S1. Grooves are respectively arranged on the butt joint surfaces of two bimetallic explosion-clad steel plates;

[0014] S2. The two bimetallic explosion-clad steel plates are butted with a gap in the form of the grooves, and the two grooves are butted to form an X-shaped groove; on both sides inside the X-shaped groove, the base layers of the two bimetallic explosion-clad steel plates are facing each other, and the clad layers of the two bimetallic explosion-clad steel plates are facing each other;

[0015] S3. Weld with a first electrode in the X-shaped groove to weld and connect the two base layers, and form a base layer weld in the X-shaped groove;

[0016] S4. Weld with a second electrode at the narrowest part of the X-shaped groove to form a transition weld, and the transition weld covers the connection interface between the base layer and the clad layer; the second electrode uses an E309LMO stainless steel electrode;

[0017] S5. Weld with a third electrode in the X-shaped groove to weld and connect the two clad layers, and form a clad layer weld in the X-shaped groove.

[0018] In one embodiment, the narrowest part of the X-shaped groove is located at the end of the base layer close to the clad layer.

[0019] In one embodiment, the first electrode uses an E5515 stainless steel electrode; the third electrode uses an E316L stainless steel electrode.

[0020] In one embodiment, in step S3, before welding, the bimetallic explosion-clad steel plate is preheated, and 150°C < preheating temperature < 300°C.

[0021] In one embodiment, in step S3, the welding current is 150A - 180A, and the welding speed is 100mm / min - 150mm / min.

[0022] In one embodiment, in step S4, the welding current is 90A - 120A, and the welding speed is 160mm / min - 200mm / min.

[0023] In one embodiment, in step S5, the welding current is 90A - 120A, and the welding speed is 150mm / min - 180mm / min.

[0024] The present invention also provides a butt joint of a bimetallic explosion - clad steel plate, which is formed by the butt - joint method of the bimetallic explosion - clad steel plate.

[0025] The beneficial effects of the present invention: The bimetallic explosion - clad steel plate is obtained by explosion welding, with low manufacturing cost, and has the advantages of corrosion resistance, radiation resistance, high strength and high toughness, etc. It has a wide range of applications and high economic efficiency.

[0026] The butt - joint method of the bimetallic explosion - clad steel plate of the present invention realizes full - penetration welding between the butt joints of 316L / Q460 bimetallic explosion - clad steel plates with low cost and high strength, enabling the welded joint to achieve high - strength metallurgical bonding, which can meet the design requirements of offshore nuclear engineering equipment, etc. The 316L / Q460 composite steel plate and welding process technology can be popularized and applied to the manufacturing of chemical industry, offshore equipment and other related equipment. The overall manufacturing cost of the bimetallic explosion - clad steel plate is greatly reduced, the product can simultaneously realize large - area production and manufacturing, the welding process is simple and operable, which is convenient for the engineering application of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0028] Figure 1 is a schematic structural diagram of a bimetallic explosion - clad steel plate according to an embodiment of the present invention;

[0029] Figure 2 is a schematic structural diagram of the butt - joint of two bimetallic explosion - clad steel plates in the butt - joint method of the bimetallic explosion - clad steel plate according to an embodiment of the present invention;

[0030] Figure 3 is a schematic structural diagram of the two bimetallic explosion - clad steel plates after welding in the butt - joint method of the bimetallic explosion - clad steel plate according to an embodiment of the present invention;

[0031] Figure 4 is a metallographic diagram of the butt - joint of the bimetallic explosion - clad steel plate in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In order to have a clearer understanding of the technical features, objectives and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the drawings.

[0033] Refer to Figure 1 , the bimetallic explosion - clad steel plate of the present invention includes a 316L stainless steel plate 20 and a Q460 low - alloy high - strength steel plate 10 which are composite - welded by explosion welding.

[0034] The 316L stainless steel plate 20 has excellent corrosion resistance and mechanical properties, and the Q460 low-alloy high-strength steel plate 10 has properties such as high strength and high toughness. The two stainless steel plates are compounded to form an integrated composite steel plate, so that the composite steel plate combines the advantages of the two stainless steel plates, that is, it has high strength, high toughness and high radiation resistance. Moreover, the 316L stainless steel plate 20 and the Q460 low-alloy high-strength steel plate 10 have lower costs compared with other stainless steel plates such as 304L, improve economic efficiency, and have a wide range of applications.

[0035] In the bimetallic explosion-clad steel plate, the Q460 low-alloy high-strength steel plate 10 serves as the base layer, and the 316L stainless steel plate 20 serves as the clad layer. The thickness of the base layer is ≥8 mm, and the maximum thickness can reach 300 mm; the thickness of the clad layer is 1 mm to 14 mm.

[0036] Preferably, the thickness of the base layer is greater than that of the clad layer. In one embodiment, the thickness of the base layer is 20 mm, and the thickness of the clad layer is 3 mm.

[0037] In one embodiment, the Q460 low-alloy high-strength steel plate 10 includes the following chemical components by mass percentage: 0.15% C, 0.34% Si, 1.41% Mn, 0.011% P, 0.0013% S, 0.023% Nb, 0.049 V, 0.003% Ti, 0.06% Cr, 0.02% Ni, 0.04% Cu, 0.008% Mo, 0.0044 N, and the rest is Fe and inevitable trace impurities in smelting. The 316L stainless steel plate 20 includes the following chemical components by mass percentage: 0.019% C, 0.486% Si, 1.48% Mn, 0.028% P, 0.0066 S, 16.81% Cr, 10.08% Ni, 2.03% Mo, 0.012% N, and the rest is Fe and inevitable trace impurities in smelting.

[0038] When manufacturing the bimetallic explosion - clad steel plate, the Q460 low - alloy high - strength steel plate 10 serving as the base layer is placed on the lower layer, and the intermediate support distance between the base layer and the clad layer is 8 mm. Explosives are laid on the 316L stainless steel plate 20 serving as the clad layer. The explosives used include 50% powdered emulsion explosive and 50% inert additive, which can be abbreviated as F50; the inert additive is further a mineral powder additive, preferably brown fused alumina powder. The laying thickness of the explosives can be 30 mm. The initiation point of the explosives is located at the mid - point of the short side. By detonating the point explosives, using the explosives as the energy source, the clad layer rapidly impacts the base layer under the action of the impact force generated by the explosion of the explosives, thus realizing the welding of the two - layer metals. Due to the action of the shock wave during the explosion of the explosives, a wavy - combined structure is formed between the two - layer metals, and this structure further consolidates the welding stability between the clad layer and the base layer to a certain extent. The bonding rate of the bimetallic explosion - clad steel plate can reach 100% through ultrasonic non - destructive testing, and it can also meet the Class I flaw detection level in the standard NB / T47013.

[0039] The bimetallic explosion - clad steel plate formed by explosion welding is heat - treated: heated at 600 °C for 15 min, with a heating rate < 200 °C / hour, held for 90 minutes, then cooled in the furnace to 250 °C, and then air - cooled to room temperature outside the furnace. The finally obtained heat - treated product forms a typical wavy - structure composite body at the interface, and the wavelength and amplitude are 1064 μm and 426 μm respectively. In the above heat treatment, the temperature can be increased or decreased by 15 °C (±15 °C) as needed, and the heating time and holding time are selected to increase or decrease according to the temperature to meet the corresponding requirements.

[0040] In the bimetallic explosion - clad steel plate, the bonding interface between the 316L stainless steel plate 20 and the Q460 low - alloy high - strength steel plate 10 is wavy, as Figure 1 shown.

[0041] At least two bimetallic explosion - clad steel plates are butt - welded to form butt - joints of various structural forms, including but not limited to containers, pipelines, tank bodies, etc.

[0042] Refer to Figures 2 - 4 , the butt - welding method of the bimetallic explosion - clad steel plate according to an embodiment of the present invention includes the following steps:

[0043] S1. Grooves are respectively set on the butt - joint surfaces of the two bimetallic explosion - clad steel plates.

[0044] As Figure 2 shown, the groove of each bimetallic explosion - clad steel plate is roughly V - shaped, the groove has a root face 301, and the root face 301 is located at the end of the base layer (Q460 low - alloy high - strength steel plate 10) close to the clad layer. The unilateral angle of the groove 103 can be 30°±5°.

[0045] Among them, after each bimetallic explosion composite steel plate is processed with a bevel, it also includes cleaning the stains on the bevel and within the surrounding area with alcohol.

[0046] S2. Gap butt joint the two bimetallic explosion composite steel plates with bevels, and the two bevels are butted to form an X-shaped bevel 30.

[0047] On both sides within the X-shaped bevel 30, the base layers (Q460 low-alloy high-strength steel plates 10) of the two bimetallic explosion composite steel plates face each other, and the clad layers (316L stainless steel plates 20) of the two bimetallic explosion composite steel plates face each other.

[0048] The root faces 301 of the upper bevels of the two bimetallic explosion composite steel plates are opposite to form the narrowest part of the X-shaped bevel 30. The angle of the X-shaped bevel 30 can be 60° ± 10°. The narrowest part of the X-shaped bevel 30 is located at the end of the base layer close to the clad layer. In one embodiment, the length (in the thickness direction of the bimetallic explosion composite steel plate) of the narrowest part of the X-shaped bevel 30 is 2 mm.

[0049] S3. Weld within the X-shaped bevel 30 using a first welding electrode to weld and connect the base layers (Q460 low-alloy high-strength steel plates 10) of the two bimetallic explosion composite steel plates, and form a base layer weld 31 within the X-shaped bevel 30.

[0050] Before welding, preheat the bimetallic explosion composite steel plate, and the preheating temperature is above 150°C and below 300°C.

[0051] Preferably, corresponding to the base layer being the Q460 low-alloy high-strength steel plate 10, the first welding electrode uses an E5515 stainless steel electrode. When welding, a crescent-shaped arc movement is used. The welding current is 150 A - 180 A, and the welding speed is 100 mm / min - 150 mm / min.

[0052] After welding is completed, back gouging is performed. The two bimetallic explosion composite steel plates are connected as a whole through the base layer weld 31 within the X-shaped bevel 30.

[0053] S4. Weld at the narrowest part of the X-shaped bevel 30 using a second welding electrode to form a transition weld 32, and the transition weld 32 covers the connection interface between the base layer and the clad layer.

[0054] When welding, specifically start welding on one side of the base layer weld 31 facing the narrowest part of the X-shaped bevel 30, with a crescent-shaped arc movement, fill the narrowest part of the X-shaped bevel 30 and connect the ends of the two opposite base layers as a whole. The transition weld 32 not only fills the narrowest part of the X-shaped bevel 30 but also covers the connection interface between the base layer and the clad layer, that is: butt the wavy bonding interfaces in the two bimetallic explosion composite steel plates and butt the bonding interfaces of the two bimetallic explosion composite steel plates as a whole.

[0055] The thickness of the transition weld 32 is preferably greater than the width of the wavy bonding interface.

[0056] Based on the base layer being the Q460 low-alloy high-strength steel plate 10 and the clad layer being the 316L stainless steel plate 20, to ensure the mutual fusion of the materials at the transition weld 32 and avoid the initiation of cracks in the transition weld 32, the second electrode uses an E309LMO stainless steel electrode. During welding, the welding current is 90A - 120A, and the welding speed is 160mm / min - 200mm / min.

[0057] S5. Use the third electrode to weld within the X-shaped groove 30 to connect the two clad layers and form a clad weld 33 within the X-shaped groove 30.

[0058] Specifically, use the third electrode to weld on the transition weld 32 to form a clad weld 33, which is filled between the clad layers of the two bimetallic explosion-clad steel plates, and butt-join the two clad layers into one body.

[0059] Preferably, the third electrode uses an E316L stainless steel electrode. During welding, the welding current is 90A - 120A, and the welding speed is 150mm / min - 180mm / min.

[0060] During the above welding processes, the interpass temperature during the welding of the base weld 31 is not higher than 300°C, and the interpass temperature of the transition weld 32 and the clad weld 33 layers is not higher than 150°C.

[0061] In an embodiment, the thickness of the base layer of each bimetallic explosion-clad steel plate is 20mm, and the thickness of the clad layer is 3mm. The base weld 31 is formed by welding with an E5515 electrode of φ4.0mm, the transition weld 32 is formed by welding with an E309LMO electrode of φ3.2mm, and the clad weld 33 is formed by welding with an E316L electrode of Φ3.2.

[0062] The welding parameters of each weld in the present invention are shown in Table 1 below.

[0063] Table 1

[0064]

[0065]

[0066] Perform tensile, bending, and impact performance tests on the butt-jointed parts after welding, and use the metallographic method for microstructure and morphology analysis. The metallography of the butt-jointed parts of the bimetallic explosion-clad steel plates is as Figure 4 shown.

[0067] After welding, the weld seams were ground flat and subjected to penetrant testing. Then, the test plates were dissected and sampled for testing and analysis. The test and analysis referred to the method in NB / T 47013 "Welding Procedure Qualification for Pressure Equipment".

[0068] 1. Visual inspection of the butt joints of bimetallic explosion clad steel plates:

[0069] After the welding of the specimens was completed, the external dimensions and surface quality of the weld seams were inspected, and the inspection rate was 100%. The weld surface was smooth and dense, and uniformly and smoothly transitioned to the base metal. There were no defects such as pores, weld beads, depressions, and undercuts in the visual inspection, and the appearance quality was good.

[0070] 2. Nondestructive testing of the butt joints of bimetallic explosion clad steel plates:

[0071] After the visual inspection, 100% penetrant (PT) testing was carried out on the front and back weld surfaces of the specimens, meeting the Class I requirements of NB / T47013-2015 "Nondestructive Testing of Pressure Equipment".

[0072] 3. Joint strength and bending properties of the butt joints of bimetallic explosion clad steel plates:

[0073] For the tensile test and bending test of the welded joints, specimen processing and experimental testing were carried out in accordance with NB / T 47014 "Welding Procedure Qualification for Pressure Equipment". The tensile test was carried out on a 600KN material testing machine, and the bending test was carried out on a 1000kN bending testing machine. The tensile strength of the welded joints of the butt joints could reach 654MPa (qualified standard value ≥ 537MPa). The tensile strength of the base layer Q460 could reach 615MPa (qualified standard value ≥ 540MPa).

[0074] 4. Impact properties of the butt joints of bimetallic explosion clad steel plates:

[0075] The Charpy V-notch impact test was used to evaluate the impact toughness of the welded joints. According to the requirements specified in the standard NB / T 47014 "Welding Procedure Qualification for Pressure Equipment", the impact absorption energy of the base layer weld metal and the heat affected zone of the joints was tested at -20°C respectively.

[0076] Under the test conditions of -20°C, the average value of KV2 of a set of three weld impact specimens was 62.7J (62J, 62J, 64J), and each individual data was higher than the lower limit value of the impact energy of the base metal specified in GB / T 1591, which was 20J. The impact performance of the heat affected zone was relatively high, reaching 153.7J (167J, 143J, 151J). From the data results, the impact energy values of the weld and the heat affected zone both met the requirements specified in NB / T47014 "Welding Procedure Qualification for Pressure Equipment".

[0077] 5. Intergranular corrosion properties of the joints of bimetallic explosion clad steel plates:

[0078] The intergranular corrosion performance of the clad weld of the clad steel plate was tested by using Test Method E (Stainless Steel Sulfuric Acid-Copper Sulfate Corrosion Test Method) specified in the standard GB / T 4334-2020 "Corrosion of Metals and Alloys - Test Methods for Intergranular Corrosion of Austenitic and Ferritic-Austenitic (Duplex) Stainless Steels - Method E". The experimental results showed that no cracks caused by intergranular corrosion occurred on the outer surface of the bent part, and there was no tendency to intergranular corrosion.

[0079] The present invention realizes full penetration welding between the butt joints of low-cost and high-strength 316L / Q460 clad steel plates (bimetallic explosion clad steel plates), enabling the welded joints to achieve high-strength metallurgical bonding, which can meet the design requirements of offshore nuclear engineering equipment, etc. The 316L / Q460 clad steel plate and the welding process technology can be popularized and applied to the manufacturing of chemical engineering, offshore equipment and other related equipment. The overall manufacturing cost of the clad steel plate is greatly reduced, and large-area production and manufacturing of products can be achieved at the same time. The welding process is simple and operable, facilitating the convenient application of products in engineering.

[0080] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A bimetallic explosion-proof composite steel plate, characterized in that: It comprises a 316L stainless steel plate and a Q460 low alloy high strength steel plate compounded by explosion welding; in the bimetallic explosion composite steel plate, the Q460 low alloy high strength steel plate is used as a base layer, and the 316L stainless steel plate is used as a cladding layer; the bonding interface between the base layer and the cladding layer is wavy.

2. The bimetallic explosion-composite steel plate according to claim 1, characterized in that: The Q460 low alloy high strength steel plate includes the following chemical components in mass percentage: 0.15% C, 0.34% Si, 1.41% Mn, 0.011% P, 0.0013% S, 0.023% Nb, 0.049V, 0.003% Ti, 0.06% Cr, 0.02% Ni, 0.04% Cu, 0.008% Mo, 0.0044N, and the rest is Fe and unavoidable trace impurities in smelting; The 316L stainless steel plate includes the following chemical components in mass percentage: 0.019% C, 0.486% Si, 1.48% Mn, 0.028% P, 0.0066S, 16.81% Cr, 10.08% Ni, 2.03% Mo, 0.012% N, and the rest is Fe and inevitable trace impurities in smelting.

3. The bimetallic explosion-composite steel plate according to claim 1, characterized in that: The thickness of the base layer is ≥8 mm, and the thickness of the coating layer is 1 mm to 14 mm.

4. The bimetallic explosion-composite steel plate according to claim 1, characterized in that: In explosive welding, the explosives used include powdered emulsion explosives and inert additives; After the explosive compounding, heat treatment is performed: heating at 600°C ± 15°C, with a heating rate of <200°C / hour, keeping warm, then cooling in the furnace to 250°C ± 15°C, and then taking out of the furnace and air cooling to room temperature.

5. A method for butting bimetallic explosion-clad steel plates according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Bevels are respectively provided on the butt joint surfaces of two bimetallic explosion-composite steel plates; S2, butting the two bimetallic explosion composite steel plates at a groove to form an X-shaped groove; on both sides of the X-shaped groove, the base layers of the two bimetallic explosion composite steel plates are facing each other, and the covering layers of the two bimetallic explosion composite steel plates are facing each other; S3, using a first welding rod to weld in the X-shaped groove, welding the two base layers together, and forming a base weld in the X-shaped groove; S4, using a second welding rod to weld at the narrowest part of the X-shaped groove to form a transition weld, wherein the transition weld covers the connection interface between the base layer and the cladding layer; the second welding rod is an E309LMO stainless steel welding rod; S5. Use a third welding rod to perform welding in the X-shaped groove to weld the two cladding layers together and form a cladding weld in the X-shaped groove.

6. The method for butting bimetallic explosively composite steel plates according to claim 5, characterized in that: The narrowest part of the X-shaped groove is located at the end of the base layer close to the covering layer.

7. The method for butting bimetallic explosively composite steel plates according to claim 5, characterized in that: The first welding rod is made of E5515 stainless steel welding rod; the third welding rod is made of E316L stainless steel welding rod.

8. The method for butting bimetallic explosively composite steel plates according to claim 5, characterized in that: In step S3, before welding, the bimetallic explosion composite steel plate is preheated, 150°C<preheating temperature<300°C.

9. The method for butting bimetallic explosion-clad steel plates according to any one of claims 5 to 8, characterized in that: In step S3, the welding current is 150A to 180A, and the welding speed is 100mm / min to 150mm / min; In step S4, the welding current is 90A to 120A, and the welding speed is 160mm / min to 200mm / min; In step S5, the welding current is 90A to 120A, and the welding speed is 150mm / min to 180mm / min.

10. A bimetallic explosion-composite steel plate butt joint, characterized in that: It is formed by the butt-jointing method of bimetallic explosion-composite steel plates as described in any one of claims 6 to 9.

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