CN108788519B - Preparation process and application of high-strength stainless steel electric arc welding flux-cored wire - Google Patents
Preparation process and application of high-strength stainless steel electric arc welding flux-cored wire Download PDFInfo
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- CN108788519B CN108788519B CN201811056302.5A CN201811056302A CN108788519B CN 108788519 B CN108788519 B CN 108788519B CN 201811056302 A CN201811056302 A CN 201811056302A CN 108788519 B CN108788519 B CN 108788519B
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/406—Filled tubular wire or rods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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Abstract
The invention belongs to the technical field of welding material preparation, and particularly relates to a preparation process and application of a high-strength stainless steel arc welding flux-cored wire. The preparation process of the welding wire specifically comprises the following steps: (1) confirming the components of the medicine core; (2) grinding; (3) mixing and drying the powder; (4) preparing a welding wire bus; (5) treating the surface of the welding wire with a film; (6) drawing and bright annealing; (7) reducing and drawing; (8) eliminating internal stress and straightening; (9) dry wiping, washing with water, drying, coating with oil, coiling into disc, and sealing and packaging. The preparation process of the high-strength stainless steel electric arc welding flux-cored wire is stable and easy to realize, the drawing performance of the wire is excellent, and the diameter precision of the wire is high; the welding process is excellent, the electric arc is stable, the splashing is small, the welding seam is attractive in forming, the prepared welding wire has the advantages of high strength, good toughness and corrosion resistance, and the requirement of the welding of austenitic stainless steel with 650 MPa-level tensile strength is met.
Description
Technical Field
The invention belongs to the technical field of welding material preparation, and particularly relates to a preparation process and application of a high-strength stainless steel arc welding flux-cored wire.
Background
With the development of modern industrial technology, the stainless steel industry is rapidly developed, and stainless steel is widely applied due to excellent mechanical properties and corrosion resistance, but the welding problem is more obvious. The strong increase of the consumption of stainless steel inevitably drives the rapid growth of the welding market: on one hand, the quality of steel products is improved to promote the update of stainless steel welding materials; on the other hand, the high-efficiency (automatic) process of stainless steel welding is obviously accelerated, and the adjustment pace of various structures of welding materials is accelerated.
In the actual welding process of the stainless steel, the strength and toughness of a welding joint and the strength and toughness level of a base metal have great difference, so that the production cost of a product is increased, and safety accidents are easily caused. The welding rod consists of two parts, namely a welding core and a coating. The welding rod is made by uniformly and centripetally pressing and coating the coating (coating) on the metal core wire. The welding rod types are different, and the welding cores are also different. In order to ensure the quality and performance of welding seam, the contents of all metal elements in the welding core are strictly regulated, and especially the contents of harmful impurities (such as sulfur, phosphorus and the like) are strictly limited, which is superior to that of the base metal.
Compared with the traditional manual welding rod, a copper-plated solid-core welding wire and a submerged arc welding flux, the stainless steel flux-cored welding wire has obvious advantages, firstly, the welding process is more continuous, and automatic welding can be realized, so that welding joints are reduced, the production efficiency is greatly improved, the welding quality is 3-4 times that of manual electric arc welding, the energy is saved, and the comprehensive cost is reduced; secondly, the stainless steel flux-cored wire does not generate heat and reddens, the splashing is extremely small, the welding line is bright and silvery white, and acid pickling, grinding and polishing are not needed after welding; thirdly, the powder in the flux-cored wire is baked at high temperature, the moisture is very little, the powder does not need to be dried before welding, and the air hole sensitivity is low. Therefore, the stainless steel flux-cored wire is widely applied to the industries of shipbuilding, petrifaction, pressure vessels, steel structures, engineering machinery and the like.
Therefore, with the rapid, stable and continuous development of economy, the market demand for stainless steel materials is rapidly increased, the demand for stainless steel flux-cored wires is also increased, and a novel flux-cored wire matched with stainless steel is developed and developed, so that the novel flux-cored wire has the characteristics of good welding process performance, stable electric arc, small splashing and attractive weld forming under the condition of meeting the low cost, and is an important research subject.
Disclosure of Invention
The invention aims to provide a preparation process and application of a high-strength stainless steel arc welding flux-cored wire.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation process of a high-strength stainless steel arc welding flux-cored wire comprises a flux core and a stainless steel band, and specifically comprises the following steps:
(1) the medicine core comprises the following components in percentage by mass: chromium powder: 25-30%, nickel powder: 15-20% and molybdenum powder: 1-3% and manganese powder: 0.2-0.8%, titanium powder: 0.5-3%, multi-component alloy: 5-10% of quartz, 5-8% of rutile, 4-7% of zircon sand, 5-8% of fluoride and the balance of iron powder, wherein the sum of the mass percentages of the components is 100%;
(2) adding quartz, calcium fluoride, rutile, zircon sand and the multicomponent alloy weighed in the step (1) into a water glass adhesive agent accounting for 10-15% of the total mass of the flux core, uniformly mixing, then placing in a heating furnace for sintering at the temperature of 600 ℃ for 1-3h, grinding, sieving, and screening mixed powder with the granularity of 60-90 meshes;
(3) fully stirring the other residual components in the step (1) and the mixed powder prepared in the step (2), and drying the mixture for 3-5 hours in a drying furnace at the temperature of 155-165 ℃ after mixing to ensure that the moisture of the flux core is less than 400 ppm;
(4) placing the stainless steel strip on a strip placing machine of a flux-cored forming machine, rolling the stainless steel strip into a U-shaped groove by the forming machine, then adding half of the flux-cored powder obtained in the step (3) into the U-shaped groove, and rolling and closing the U-shaped groove; rolling into a U-shaped groove again, adding the residual flux-cored powder, controlling the integral filling rate of the flux-cored powder to be 23-28%, and then rolling and closing a U-shaped groove steel belt through a forming machine to form a welding wire bus with the diameter of 4-6 mm;
(5) rolling and drawing the welding wire bus in the step (4) into a tank containing a surface film removing solution to perform surface film treatment;
(6) drying the welding wire bus treated by the surface film in the step (5), sending the welding wire bus into a straight-moving type rough wire drawing machine for primary drawing, performing bright annealing, and repeating the process for 4-6 times to eliminate the processing hardening and shrinkage of the drawn welding wire;
(7) drawing the rough drawn welding wire in the step (6) into a straight-advancing type fine wire drawing machine, and performing 9-grade reducing treatment to obtain a welding wire with the diameter of 1.8-2 mm;
(8) straightening the welding wire subjected to drawing treatment in the step (7) in a straightener for eliminating residual stress generated in the drawing process;
(9) and (4) drying and washing the welding wire straightened in the step (8) by dry wiping, oiling, coiling into a disc, and sealing and packaging.
Further, the stainless steel band is a 304 stainless steel band with the carbon content of 0-0.04%.
Further, the multi-component alloy described in the above step (1) has a mass composition of Mg45%, Al 35%, Zn 12%, and B8%.
Further, the fluoride in the step (1) is one or a combination of more of sodium fluoride, sodium fluorosilicate, potassium fluorosilicate and sodium fluoroaluminate.
Further, the water glass in the step (2) is potassium water glass, the baume degree is 44-46, the modulus is 2.7-2.9, the mass percentage of potassium oxide is 14-17%, wherein the mass percentage of silicon dioxide is 28.0-31.0%, and the balance is water.
Further, the surface film removing solution in the step (5) is composed of 35% by mass of potassium sulfate, 20% by mass of sodium carbonate, 30% by mass of sodium stearate and 15% by mass of an extreme pressure additive.
Further, the extreme pressure additive comprises 35-45% of football alkene, 30-35% of molybdenum disulfide and 20-35% of sulfurized oleic acid in percentage by mass.
Furthermore, the high-strength stainless steel arc welding flux-cored wire is applied to austenitic stainless steel welding with the tensile strength of 650 MPa.
Furthermore, the purity is more than 99 percent when the carbon dioxide gas is adopted for protection during welding.
Further, the welding conditions are as follows: the current is 180-.
The invention has the following beneficial effects:
(1) the preparation process and the application of the high-strength stainless steel arc welding flux-cored wire have the advantages that the process is stable and easy to realize, the drawing performance of the welding wire is excellent, the diameter precision of the welding wire is high, the friction of a welding wire bus in the drawing process is reduced by utilizing a rolling traction mode, the roughness of the outer surface is low, and the appearance quality of the welding wire is good.
(2) According to the preparation process and the application of the high-strength stainless steel arc welding flux-cored wire, disclosed by the invention, the surface of the welding wire is subjected to film treatment, so that the welding process of the welding wire in the subsequent welding process is excellent, the electric arc is stable, the splashing is small, the weld joint is attractive in shape, the internal stress is eliminated, the linear stability effect is facilitated, and the welding crack is avoided.
(3) The preparation process and the application of the high-strength stainless steel electric arc welding flux-cored wire adopt the method of rolling the U-shaped groove twice and adding the flux core twice, so that the phenomenon that the flux core powder is rapidly compressed to cause overlarge pressure on a steel belt in the flattening or drawing process is avoided, the integrity of the steel belt is effectively protected, and the prepared welding wire has the advantages of high strength, good toughness and corrosion resistance, and meets the requirement of the welding of austenitic stainless steel with the tensile strength of 650 MPa.
(4) The preparation process and the application of the high-strength stainless steel arc welding flux-cored wire have the advantages of stable process, easy operation, low comprehensive cost, high efficiency and convenience for large-scale and continuous production operation.
Detailed Description
The present invention will now be described in further detail with reference to examples.
Example 1
A preparation process of a high-strength stainless steel arc welding flux-cored wire comprises a flux core and a 304 stainless steel band with the carbon content of 0.04%, and specifically comprises the following steps:
(1) the medicine core comprises the following components in percentage by mass: chromium powder: 25%, nickel powder: 15% and molybdenum powder: 1% and manganese powder: 0.2%, titanium powder: 0.5%, multi-component alloy: 10 percent of quartz, 8 percent of rutile, 7 percent of zircon sand, 3 percent of sodium fluoride and the balance of iron powder, wherein the sum of the mass percentages of the components is 100 percent, and the mass composition of the multicomponent alloy comprises Mg45 percent, Al 35 percent, Zn 12 percent and B8 percent;
(2) adding quartz, calcium fluoride, rutile, zircon sand and the multicomponent alloy weighed in the step (1) into a water glass adhesive agent accounting for 10% of the total mass of the flux core, uniformly mixing, then placing in a heating furnace, sintering at 550 ℃ for 3h, grinding, sieving, and screening mixed powder with the granularity of 60 meshes, wherein the water glass is potassium water glass, the baume degree is 44, the modulus is 2.7, the mass percentage of potassium oxide is 14%, the mass percentage of silicon dioxide is 28.0%, and the balance is water;
(3) fully stirring the other residual components in the step (1) and the mixed powder prepared in the step (2), and drying for 5 hours in a drying furnace at 155 ℃ after mixing to ensure that the moisture of the medicine core is lower than 400 ppm;
(4) placing the stainless steel strip on a strip placing machine of a flux-cored forming machine, rolling the stainless steel strip into a U-shaped groove by the forming machine, then adding half of the flux-cored powder obtained in the step (3) into the U-shaped groove, and rolling and closing the U-shaped groove; rolling into a U-shaped groove again, adding the residual flux-cored powder, controlling the integral filling rate of the flux-cored powder to be 28%, and then rolling and closing a U-shaped groove steel belt through a forming machine to form a welding wire bus with the diameter of 6 mm;
(5) rolling and drawing the welding wire bus in the step (4) into a groove containing a surface film removing solution to perform surface film treatment, wherein the surface film removing solution consists of 35 mass percent of potassium sulfate, 20 mass percent of sodium carbonate, 30 mass percent of sodium stearate and 15 mass percent of extreme pressure additive, and the extreme pressure additive consists of 35 mass percent of football, 35 mass percent of molybdenum disulfide and 30 mass percent of sulfurized oleic acid;
(6) drying the welding wire bus treated by the surface film in the step (5), sending the welding wire bus into a straight-moving type rough wire drawing machine for primary drawing, performing bright annealing, and repeating the process for 4-6 times to eliminate the processing hardening and shrinkage of the drawn welding wire;
(7) drawing the rough drawn welding wire in the step (6) into a straight-advancing type fine wire drawing machine, and performing 9-grade reducing treatment to obtain a welding wire with the diameter of 2 mm;
(8) straightening the welding wire subjected to drawing treatment in the step (7) in a straightener for eliminating residual stress generated in the drawing process;
(9) and (4) drying and washing the welding wire straightened in the step (8) by dry wiping, oiling, coiling into a disc, and sealing and packaging.
The welding wire prepared in the embodiment 1 is used for welding austenitic stainless steel with the tensile strength of 650MPa, carbon dioxide gas is adopted for protection during welding, and the purity is more than 99 percent; the welding current is 180A, the voltage is 30V, and the welding speed is 350 mm/min.
Example 2
A preparation process of a high-strength stainless steel arc welding flux-cored wire comprises a flux core and a 304 stainless steel band with the carbon content of 0.03%, and specifically comprises the following steps:
(1) the medicine core comprises the following components in percentage by mass: chromium powder: 20%, nickel powder: 18% and molybdenum powder: 2% and manganese powder: 0.5%, titanium powder: 2% of a multi-component alloy: 8 percent of quartz, 6 percent of rutile, 6.5 percent of zircon sand, 2 percent of sodium fluosilicate and the balance of iron powder, wherein the sum of the mass percentages of the components is 100 percent, and the mass composition of the multi-element alloy comprises Mg45 percent, Al 35 percent, Zn 12 percent and B8 percent;
(2) adding quartz, calcium fluoride, rutile, zircon sand and the multicomponent alloy weighed in the step (1) into a water glass adhesive agent with the total mass of 12% of the flux core, uniformly mixing, then placing in a heating furnace for sintering at 580 ℃ for 2h, grinding, sieving, and screening mixed powder with the granularity of 75 meshes, wherein the water glass is potassium water glass, the baume degree is 45, the modulus is 2.8, the mass percentage of potassium oxide is 16%, the mass percentage of silicon dioxide is 29%, and the balance is water;
(3) fully stirring the other residual components in the step (1) and the mixed powder prepared in the step (2), and drying for 4 hours in a drying furnace at 160 ℃ after mixing to ensure that the moisture of the medicine core is lower than 400 ppm;
(4) placing the stainless steel strip on a strip placing machine of a flux-cored forming machine, rolling the stainless steel strip into a U-shaped groove by the forming machine, then adding half of the flux-cored powder obtained in the step (3) into the U-shaped groove, and rolling and closing the U-shaped groove; rolling into a U-shaped groove again, adding the residual flux-cored powder, controlling the overall filling rate of the flux-cored powder to be 25%, and then rolling and closing a U-shaped groove steel belt through a forming machine to form a welding wire bus with the diameter of 5 mm;
(5) rolling and drawing the welding wire bus in the step (4) into a groove containing a surface film removing solution for surface film treatment, wherein the surface film removing solution consists of 35 mass percent of potassium sulfate, 20 mass percent of sodium carbonate, 30 mass percent of sodium stearate and 15 mass percent of extreme pressure additive, and the extreme pressure additive consists of 40 mass percent of football, 30 mass percent of molybdenum disulfide and 30 mass percent of sulfurized oleic acid;
(6) drying the welding wire bus treated by the surface film in the step (5), sending the welding wire bus into a straight-moving type rough wire drawing machine for primary drawing, performing bright annealing, and repeating the process for 4-6 times to eliminate the processing hardening and shrinkage of the drawn welding wire;
(7) drawing the rough drawn welding wire in the step (6) into a straight-advancing type fine wire drawing machine, and performing 9-grade reducing treatment to obtain a welding wire with the diameter of 1.9 mm;
(8) straightening the welding wire subjected to drawing treatment in the step (7) in a straightener for eliminating residual stress generated in the drawing process;
(9) and (4) drying and washing the welding wire straightened in the step (8) by dry wiping, oiling, coiling into a disc, and sealing and packaging.
The welding wire prepared in the embodiment 1 is used for welding austenitic stainless steel with the tensile strength of 650MPa, carbon dioxide gas is adopted for protection during welding, and the purity is more than 99 percent; welding current 195A, voltage 28V, welding speed 385 mm/min.
Example 3
A preparation process of a high-strength stainless steel arc welding flux-cored wire comprises a flux core and a 304 stainless steel band with the carbon content of 0.02%, and specifically comprises the following steps:
(1) the medicine core comprises the following components in percentage by mass: chromium powder: 30%, nickel powder: 20% and molybdenum powder: 3% and manganese powder: 0.8%, titanium powder: 3% of a multi-component alloy: 10 percent of quartz, 8 percent of rutile, 7 percent of zircon sand, 3 percent of potassium fluosilicate and the balance of iron powder, wherein the sum of the mass percentages of the components is 100 percent, and the mass composition of the multi-element alloy comprises Mg45 percent, Al 35 percent, Zn 12 percent and B8 percent;
(2) adding quartz, calcium fluoride, rutile, zircon sand and the multicomponent alloy weighed in the step (1) into a water glass adhesive agent accounting for 15% of the total mass of the flux core, uniformly mixing, then placing in a heating furnace, sintering for 1h at 600 ℃, grinding, sieving, and screening mixed powder with the granularity of 90 meshes, wherein the water glass is potassium water glass, the baume degree is 46, the modulus is 2.9, the mass percentage of potassium oxide is 17%, the mass percentage of silicon dioxide is 31.0%, and the balance is water;
(3) fully stirring the other residual components in the step (1) and the mixed powder prepared in the step (2), and drying for 3 hours at 164 ℃ in a drying furnace after mixing to ensure that the moisture of the medicine core is lower than 400 ppm;
(4) placing the stainless steel strip on a strip placing machine of a flux-cored forming machine, rolling the stainless steel strip into a U-shaped groove by the forming machine, then adding half of the flux-cored powder obtained in the step (3) into the U-shaped groove, and rolling and closing the U-shaped groove; rolling into a U-shaped groove again, adding the residual flux-cored powder, controlling the integral filling rate of the flux-cored powder to be 23%, and then rolling and closing a U-shaped groove steel belt through a forming machine to form a welding wire bus with the diameter of 4 mm;
(5) rolling and drawing the welding wire bus in the step (4) into a groove containing a surface film removing solution to perform surface film treatment, wherein the surface film removing solution consists of 35 mass percent of potassium sulfate, 20 mass percent of sodium carbonate, 30 mass percent of sodium stearate and 15 mass percent of extreme pressure additive, and the extreme pressure additive consists of 45 mass percent of football, 35 mass percent of molybdenum disulfide and 20 mass percent of sulfurized oleic acid;
(6) drying the welding wire bus treated by the surface film in the step (5), sending the welding wire bus into a straight-moving type rough wire drawing machine for primary drawing, performing bright annealing, and repeating the process for 4-6 times to eliminate the processing hardening and shrinkage of the drawn welding wire;
(7) drawing the rough drawn welding wire in the step (6) into a straight-advancing type fine wire drawing machine, and performing 9-grade reducing treatment to obtain a welding wire with the diameter of 1.8 mm;
(8) straightening the welding wire subjected to drawing treatment in the step (7) in a straightener for eliminating residual stress generated in the drawing process;
(9) and (4) drying and washing the welding wire straightened in the step (8) by dry wiping, oiling, coiling into a disc, and sealing and packaging.
The welding wire prepared in the embodiment 1 is used for welding austenitic stainless steel with the tensile strength of 650MPa, carbon dioxide gas is adopted for protection during welding, and the purity is more than 99 percent; welding current 210A, voltage 30V and welding speed 400 mm/min.
Comparative example 1 compares to example 1, where the wire is currently free of surface film treatment.
Comparative example 2 compares with example 1 and the wire residual stress is eliminated.
And (3) performance testing:
using the welding wires obtained in examples 1 to 3 and comparative examples 1 to 2, welding operations were carried out to evaluate arc stability, slag removability, and bead shape at the upward vertical position. Further, as weld metal properties, tensile strength, toughness, flaw resistance, high temperature crack resistance, and corrosion resistance were evaluated.
The welding workability was evaluated by fillet welding in the upward vertical welding. Specifically, carbon dioxide is used as the protective gas, welding is carried out at a welding current of 180-210A, a voltage of 28-30V and a welding speed of 350-400mm/min, and the welding operability is evaluated.
Tensile strength and toughness of the weld metal were evaluated by AWS B4.0 test.
The weld metal was evaluated for flaw resistance by performing an RT test of AWS A5.11.
The weld metal was evaluated for high-temperature cracking resistance by performing a FISCO cracking test, performing a penetration flaw detection test on the surface of the weld bead immediately after welding, and examining the presence or absence of cracking.
The corrosion resistance of the weld metal was evaluated by the SATM G48C method.
The evaluation criteria are as follows:
arc stability criteria are as follows:
regarding arc stability, it is extremely good that droplets are small and spatter little for spray transition (□), that droplets close to spray transition are good for spray transition with comparatively little spatter (good), that droplets are coarse for spray transition, and that droplets are large and generate a large amount of spatter is poor (x).
Slag peelability criteria:
regarding the slag removability, the slag removability was extremely good (□), the slag removability was good (good quality) by tapping gently with a hammer, and the slag removability by hot sticking to the bead surface was poor (x).
Bead shape at the upward vertical position:
with respect to the bead shape at the upward vertical position, the bead shape satisfying the criterion for the fillet of AWS a5.34 is extremely good (□), the bead shape satisfying the criterion for the fillet of a5.34 is good (good), and the bead shape satisfying the criterion for the fillet of a5.34 is poor (x).
Standard of tensile strength:
the tensile strength was found to be extremely good (□) at 650MPa or more, good (good) at 600-650MPa, and poor (x) at less than 600 MPa.
And (3) toughness standard:
as regards toughness, it is evaluated in a pendulum impact test at-196 ℃. The absorption energy was 60J or more (good), and less than 60J was poor (x).
Defect resistance criteria:
regarding the defect resistance, the ones satisfying the acceptance criterion of the RT test of AWS a5.11 were good (good), and the ones not satisfying the acceptance criterion of the RT test of AWSA5.11 were poor (x).
High temperature cracking resistance standard:
the high temperature cracking resistance was evaluated by the FISO cracking test. When the test was carried out at a welding current of 200A and a welding speed of 400mm/min, the test was good (good quality) with no crack, and the test was poor (x) with crack.
Standard of corrosion resistance:
with respect to the corrosion resistance, in the ASTM G48C method, a good (good) CPT of not less than 50 ℃ is obtained, and a poor (X) CPT of less than 50 ℃.
The overall evaluation was that all of the welding workability was □, and all of the weld metal properties were good √ which is good, any one or more of the welding workability was good, and all of the weld metal properties were good, and of the welding workability and the weld metal properties, x was x, and these results are shown in table 1.
Table 1:
as can be seen from the test results of Table 1, examples 1-3 satisfying the scope of the present invention are good in welding operability, easy to handle, and good in weld metal properties, while comparative examples 1-2 are poor in overall evaluation due to poor results in welding operability and weld metal properties due to lack of critical surface film treatment and residual stress relief.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (7)
1. A preparation technology of a high-strength stainless steel electric arc welding flux-cored wire comprises a flux core and a stainless steel band, and is characterized in that: the method specifically comprises the following steps:
(1) the medicine core comprises the following components in percentage by mass: chromium powder: 25-30%, nickel powder: 15-20% and molybdenum powder: 1-3% and manganese powder: 0.2-0.8%, titanium powder: 0.5-3%, multi-component alloy: 5-10% of quartz, 5-8% of rutile, 4-7% of zircon sand, 5-8% of fluoride and the balance of iron powder, wherein the sum of the mass percentages of the components is 100%;
(2) weighing quartz, fluoride, rutile, zircon sand and the multicomponent alloy in the step (1), adding a water glass adhesive accounting for 10-15% of the total mass of the flux core, uniformly mixing, then placing in a heating furnace for sintering at the temperature of 550-600 ℃ for 1-3h, grinding, sieving, and screening mixed powder with the granularity of 60-90 meshes;
(3) fully stirring the other residual components in the step (1) and the mixed powder prepared in the step (2), and drying the mixture for 3-5 hours in a drying furnace at the temperature of 155-165 ℃ after mixing to ensure that the moisture of the flux core is less than 400 ppm;
(4) placing the stainless steel strip on a strip placing machine of a flux-cored forming machine, rolling the stainless steel strip into a U-shaped groove by the forming machine, then adding half of the flux-cored powder obtained in the step (3) into the U-shaped groove, and rolling and closing the U-shaped groove; rolling into a U-shaped groove again, adding the residual flux-cored powder, controlling the integral filling rate of the flux-cored powder to be 23-28%, and then rolling and closing a U-shaped groove steel belt through a forming machine to form a welding wire bus with the diameter of 4-6 mm;
(5) rolling and drawing the welding wire bus in the step (4) into a tank containing a surface film removing solution to perform surface film treatment;
(6) drying the welding wire bus treated by the surface film in the step (5), sending the welding wire bus into a straight-moving type rough wire drawing machine for primary drawing, performing bright annealing, and repeating the process for 4-6 times to eliminate the processing hardening and shrinkage of the drawn welding wire;
(7) drawing the rough drawn welding wire in the step (6) into a straight-advancing type fine wire drawing machine, and performing 9-grade reducing treatment to obtain a welding wire with the diameter of 1.8-2 mm;
(8) straightening the welding wire subjected to drawing treatment in the step (7) in a straightener for eliminating residual stress generated in the drawing process;
(9) dry wiping, washing, drying, oiling, coiling into a disc, and sealing and packaging the welding wire straightened in the step (8);
the mass percentages of the multi-element alloy in the step (1) are Mg45%, Al 35%, Zn 12% and B8%;
the surface film removing solution in the step (5) consists of 35 mass percent of potassium sulfate, 20 mass percent of sodium carbonate, 30 mass percent of sodium stearate and 15 mass percent of extreme pressure additive;
the extreme pressure additive consists of 35-45% of football, 30-35% of molybdenum disulfide and 20-35% of sulfurized oleic acid in percentage by mass.
2. The process for preparing a high strength stainless steel flux cored wire for arc welding of claim 1, wherein: the stainless steel band is a 304 stainless steel band with the carbon content of 0-0.04%.
3. The process for preparing a high strength stainless steel flux cored wire for arc welding of claim 1, wherein: the fluoride in the step (1) is one or a combination of more of sodium fluoride, sodium fluosilicate, potassium fluosilicate and sodium fluoroaluminate.
4. The process for preparing a high strength stainless steel flux cored wire for arc welding of claim 1, wherein: the water glass in the step (2) is potassium water glass, the Baume degree is 44-46, the modulus is 2.7-2.9, the mass percentage of potassium oxide is 14-17%, wherein the mass percentage of silicon dioxide is 28.0-31.0%, and the balance is water.
5. Use of a flux-cored wire for high-strength stainless steel arc welding prepared by the process according to any one of claims 1 to 4, wherein the wire is used in austenitic stainless steel welding with a tensile strength of 650 MPa.
6. The use of the high strength stainless steel flux cored wire for arc welding of claim 5 wherein the purity is greater than 99% with carbon dioxide shielding.
7. The use of the high strength stainless steel flux cored wire for arc welding of claim 6 wherein the welding conditions are: the current is 180-.
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| CN109706402B (en) * | 2018-12-27 | 2020-12-25 | 浙江腾龙精线有限公司 | Preparation method of duplex stainless steel consumable electrode gas shielded welding wire |
| CN109926755A (en) * | 2019-03-19 | 2019-06-25 | 江苏孚尔姆焊业股份有限公司 | Stainless flux-cored wire additive |
| CN110052698A (en) * | 2019-05-29 | 2019-07-26 | 河北科技大学 | Preset metal wire type mixing yoghurt method |
| CN113732569B (en) * | 2021-10-08 | 2022-04-22 | 江苏九洲新材料科技有限公司 | Preparation method of high-strength stainless steel flux-cored wire |
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