CN114260615B - Welding wire for welding T91-TP304H dissimilar materials and preparation method thereof - Google Patents
Welding wire for welding T91-TP304H dissimilar materials and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a welding wire for welding T91-TP304H dissimilar materials and a preparation method thereof, wherein the welding wire comprises a flux core and a welding skin, wherein the flux comprises the following components in percentage by mass: 45-50% of Cr powder, 17-20% of Mo powder, 13-15% of Nb powder, 8-10% of V powder, 3-5% of ferromanganese powder, 2-4% of ferrosilicon powder, 1-3% of Al powder and 1-3% of Cu powder, wherein the sum of the mass percentages of the components is 100%. The preparation method comprises the following steps: mixing Cr powder, mo powder, nb powder, V powder, ferromanganese powder, ferrosilicon powder, al powder and Cu powder, drying, wrapping by a pure nickel belt, and drawing to obtain the alloy. The welding joint obtained by the flux-cored wire has excellent obdurability; the flux-cored wire has less alloy elements, simple preparation process and convenient large-scale batch production.
Description
Technical Field
The invention belongs to the technical field of metal material welding, and particularly relates to a welding wire for welding T91-TP304H dissimilar materials and a preparation method of the welding wire.
Background
The steel for thermal power plants has strict requirements on material properties, and mainly has room temperature and high temperature strength in the aspect of mechanical properties. The performance of the T91 steel meets the standard specification of ASME-AS335, the tensile strength at room temperature can reach 770MPa, and the T91 steel has good ductility and toughness, good processability and oxidation resistance and excellent comprehensive mechanical properties. In the aspect of physical properties, the T91 steel has good heat-conducting property and high heat exchange efficiency, and can reduce the temperature gradient stress of pipelines and accessories; the thermal expansion coefficient is low, the thermal instantaneous stress and the thermal expansion stress generated by the temperature gradient can be reduced by using the thermal expansion coefficient, and the thermal expansion coefficient can be well adapted to the severe high-temperature and high-pressure environment of a thermal power plant. In addition, the T91 steel has excellent performance at high temperature, and the reduction of the wall thickness of the pipeline does not affect the function of the pipeline, so that the weight of the pipeline can be reduced, the thrust of the pipeline to equipment such as a steam turbine, a boiler and the like is reduced, the elasticity of a pipeline system is improved, and the processing and the installation of the pipeline are facilitated.
TP304H stainless steel belongs to austenitic heat-resistant steel, is used for manufacturing high-temperature pipelines of a superheater and a reheater, and is characterized by high lasting strength and excellent oxidation resistance and corrosion resistance. In a power plant pipeline system, along with different working temperatures of various parts, various steel materials with different chemical compositions and organizational structures are correspondingly used for various parts of a thermal engine unit, and the problem of welding of dissimilar steel is inevitable. Wherein, T91 and TP304H pipeline connection is a typical power plant dissimilar steel connection mode. However, at present, when T91 and TP304H are welded, no welding material specially matched with T91 and TP304H dissimilar material connection exists. Due to the difference of thermal physical properties and chemical compositions of T91 and TP304H, stress concentration, alloy element diffusion and other phenomena are easy to occur during welding connection, and the integral service performance is influenced. Therefore, the development of a welding material specially used for the connection of T91 and TP304H has important engineering practical significance.
Disclosure of Invention
The invention aims to provide a welding wire for welding T91-TP304H dissimilar materials, which solves the problems of unstable performance and the like when the T91-TP304H dissimilar materials are welded.
The invention also aims to provide a preparation method of the welding wire for welding the T91-TP304H dissimilar materials.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a welding wire for welding T91-TP304H dissimilar materials comprises a flux core and a welding skin, wherein the flux powder comprises the following components in percentage by mass: 45-50% of Cr powder, 17-20% of Mo powder, 13-15% of Nb powder, 8-10% of V powder, 3-5% of ferromanganese powder, 2-4% of ferrosilicon powder, 1-3% of Al powder and 1-3% of Cu powder, wherein the sum of the mass percentages of the components is 100%.
The invention is also characterized in that:
the purity of eight metal powders contained in the medicinal powder is more than or equal to 99.9 percent, and the particle sizes of the eight metal powders are 200 meshes.
The welding skin adopts a pure nickel strip, the thickness of the pure nickel strip is 0.3mm, and the width of the pure nickel strip is 7mm.
The filling amount of the flux-cored wire is controlled to be 35-40 wt%.
The second technical scheme adopted by the invention is a preparation method of the welding wire for welding the T91-TP304H dissimilar materials, which comprises the following specific steps:
step 1: respectively weighing 45-50% of Cr powder, 17-20% of Mo powder, 13-15% of Nb powder, 8-10% of V powder, 3-5% of ferromanganese powder, 2-4% of ferrosilicon powder, 1-3% of Al powder and 1-3% of Cu powder according to the mass percent, wherein the sum of the mass percent of the components is 100%;
and 2, step: heating the powder weighed in the step 1 in a vacuum heating furnace at 260-300 ℃ for 0.5-1h, and removing crystal water in the powder; placing the dried medicinal powder in a powder mixer for mixing for 0.3-0.5h;
and step 3: removing grease on the surface of the pure nickel strip by using alcohol, wrapping the medicinal powder prepared in the step (2) in the pure nickel strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing grinding tool is 2.5mm;
and 4, step 4: after the first procedure of drawing is finished, the diameter of the grinding tool is changed to 2.3mm,2.2mm,2.1mm,2.0mm,1.9mm,1.8mm,1.7mm,1.6mm,1.5mm,1.4mm,1.3mm and 1.2mm in turn, and the diameter of the finally obtained flux-cored wire is 1.2mm;
and 5: and after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for later use.
The third technical scheme adopted by the invention is that a groove form of welding the T91-TP304H dissimilar materials by the welding wire is adopted, and a V-shaped groove is formed, wherein the groove angle of the T91 side is 30 degrees, and the groove angle of the TP304H side is 20 degrees.
The beneficial effect of the invention is that,
(1) The strength and toughness of the welding seam can be effectively improved by adopting multi-alloy composite reinforcement of Cr, mo, nb, V and the like;
(2) Considering the problems of recarburization and decarbonization caused by different Cr contents in T91 ferrite steel and TP304H austenitic steel, the Cr content in the welding wire is reasonably designed, so that the phenomena of decarbonization on the T91 ferrite welding seam side and recarburization on the TP304H austenitic stainless steel side are reduced.
(3) The pure nickel solder strip is adopted for drawing, the content of C is lower, and the brittleness tendency of the joint is small;
(4) The flux-cored wire has a small diameter, the wire diameter is 1.2mm, and the flux-cored wire is widely applicable, and can be used for TIG welding and MIG welding;
(5) In the case of welding of different materials of T91-TP304H, the bevel angle on the T91 side is larger than that on the TP304H side, and is set mainly in consideration of different alloy elements of the base materials on both sides. Compared with TP304H, the T91 side slope angle is increased, so that the dilution rate during welding of the T91 base metal can be effectively reduced, and the decarburization problem is reduced.
(6) The flux-cored wire has less alloy elements, simple preparation process and convenient large-scale batch production.
Drawings
FIG. 1 is a groove structure for welding T91-TP304H dissimilar materials in the present invention;
FIG. 2 is a microstructure (corroded by 4% nitric acid alcohol) of a flux-cored wire prepared in embodiment 2 at the interface of TP1 and a welding seam when T91-TP304H dissimilar materials are welded;
FIG. 3 is a cross section of a microstructure (aqua regia corrosion) of a weld joint of a flux-cored wire prepared in example 2 during welding of T91-TP304H dissimilar materials;
FIG. 4 is a microstructure (aqua regia corrosion, longitudinal section) of a welding seam of the flux-cored wire prepared in embodiment 2 when T91-TP304H dissimilar materials are welded;
FIG. 5 is the appearance of impact fracture at the weld seam of the flux-cored wire prepared in example 2 when T91-TP304H dissimilar materials are welded.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The welding wire for welding the T91-TP304H dissimilar materials comprises a flux core and a welding skin, wherein the flux powder comprises the following components in percentage by mass: 45-50% of Cr powder, 17-20% of Mo powder, 13-15% of Nb powder, 8-10% of V powder, 3-5% of ferromanganese powder, 2-4% of ferrosilicon powder, 1-3% of Al powder and 1-3% of Cu powder, wherein the sum of the mass percentages of the components is 100%.
The purity of eight metal powders contained in the medicinal powder is more than or equal to 99.9 percent, and the granularity of the eight metal powders is 200 meshes.
The welding skin adopts a pure nickel strip, the thickness of the pure nickel strip is 0.3mm, and the width of the pure nickel strip is 7mm.
The filling amount of the flux-cored wire is controlled to be 35-40 wt%.
The flux-cored wire comprises the following components in parts by weight:
the welding skin adopts a pure nickel strip, the weldability between Ni and base metals on two sides is good, and the welding seam mainly based on Ni has excellent low-temperature toughness. In addition, the Ni element is a graphitized element, so that the activity of carbon atoms can be improved, the diffusion rate of carbon and the stability of carbide can be reduced, and the carbon migration from the low-alloy heat-resistant steel side to the high-alloy steel side can be slowed down.
Cr is used as main alloy component of flux-cored wire powder, and can expand alpha-Fe phase region, close gamma-Fe phase region and raise A 1 In addition, cr can form a substitutional solid solution and an infinite solid solution in α -Fe, and can form a strong carbide. The Cr element has the function of improving the oxidation resistance and the corrosion resistance of the heat-resistant steel. When the Cr content is less than 5%, severe oxidation starts at 600 ℃, and when the Cr content exceeds 5%, good oxidation resistance is achieved. The Cr content of the base metal of T91 per se is about 8-10%, and the Cr content in the welding seam is increased in the application, so that the generation of poor Cr on the T91 side can be effectively improved.
Mo is used as a main alloy element of the flux-cored wire powder, and can also expand an alpha-Fe phase region, close a gamma-Fe phase region and strongly increase A 1 And (4) point. Mo can form a substitutional solid solution in alpha-Fe, but cannot be infinitely solid-dissolved, and is a strong carbide-forming element.
V and Nb are main alloy elements of the flux-cored wire powder, are strong carbide forming elements, can form fine and stable alloy carbide with carbon after being added, and have strong dispersion strengthening effect. V can enlarge an alpha-Fe phase region, close a gamma-Fe phase region, strongly increase an A1 point, and form a substitutional solid solution and an infinite solid solution in alpha-Fe and is also a strong carbide forming element. Nb can also enlarge the alpha-Fe phase region, close the gamma-Fe phase region and strongly increase A 1 And (4) point.
C is the most obvious element of solid solution strengthening in steel, the short-time strength of the steel is increased along with the increase of the content of C, the plasticity and the toughness are reduced, for T91 type ferrite steel, the increase of the content of C can accelerate the spheroidization and aggregation speed of carbides, accelerate the redistribution of alloy elements and reduce the weldability, the corrosion resistance and the oxidation resistance of the steel, so that the pure nickel welding strip is adopted for drawing, the content of C is lower, and the strength reduction caused by low carbon is compensated by the strengthening of other alloy elements.
Al is used as another additive element of the flux-cored wire powder, al and N can form AlN, alN is dissolved into the matrix in a large amount at the temperature of over 1100 ℃, and is separated out again at a lower temperature, so that a better dispersion strengthening effect can be achieved.
A certain amount of Cu element is added into the flux-cored wire powder, and the Cu element can generate a copper-rich phase which is dispersed and precipitated in an austenite matrix in the service process of the steel pipe and is tightly combined with the copper-rich phase. Such copper-rich encounters NbC, nbN, nbCrN, and M 23 C 6 Such compounds serve an excellent dispersion strengthening effect.
The preparation method of the welding wire for welding the T91-TP304H dissimilar materials comprises the following specific steps:
step 1: respectively weighing 45-50% of Cr powder, 17-20% of Mo powder, 13-15% of Nb powder, 8-10% of V powder, 3-5% of ferromanganese powder, 2-4% of ferrosilicon powder, 1-3% of Al powder and 1-3% of Cu powder according to the mass percent, wherein the sum of the mass percent of the components is 100%;
and 2, step: heating the powder weighed in the step 1 in a vacuum heating furnace at 260-300 ℃ for 0.5-1h, and removing crystal water in the powder; placing the dried medicinal powder in a powder mixer for mixing for 0.3-0.5h;
and 3, step 3: removing grease on the surface of the pure nickel strip by using alcohol, wrapping the medicinal powder prepared in the step (2) in the pure nickel strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing grinding tool is 2.5mm;
and 4, step 4: after the first procedure of drawing is finished, the diameter of the grinding tool is changed to 2.3mm,2.2mm,2.1mm,2.0mm,1.9mm,1.8mm,1.7mm,1.6mm,1.5mm,1.4mm,1.3mm and 1.2mm in turn, and the diameter of the finally obtained flux-cored wire is 1.2mm;
and 5: and after the flux-cored wire is drawn, winding the flux-cored wire on a wire reel through a wire winding machine, and finally sealing the flux-cored wire in a flux-cored wire vacuum packaging bag for later use.
As shown in fig. 1, when welding different T91-TP304H materials by using the welding wire, a V-groove is formed, wherein the groove angle on the T91 side is 30 ° and the groove angle on the TP304H side is 20 °.
Example 1
Step 1: respectively weighing 45% of Cr powder, 17% of Mo powder, 15% of Nb powder, 8% of V powder, 5% of ferromanganese powder, 4% of ferrosilicon powder, 3% of Al powder and 3% of Cu powder according to the mass percent, wherein the sum of the mass percentages of the components is 100%;
and 2, step: putting the powder weighed in the step 1 into a vacuum heating furnace for heating, wherein the heating temperature is 260 ℃, the heat preservation time is 0.5h, and removing crystal water in the powder; placing the dried medicinal powder into a powder mixing machine for fully mixing for 0.3h;
and step 3: removing grease on the surface of the pure nickel strip by adopting alcohol, wrapping the medicinal powder prepared in the step (2) in the pure nickel strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing grinding tool is 2.5mm;
and 4, step 4: after the first procedure is finished, the aperture of the grinding tool is changed to 2.3mm,2.2mm,2.1mm,2.0mm,1.9mm,1.8mm,1.7mm,1.6mm,1.5mm,1.4mm,1.3mm and 1.2mm in turn, and the diameter of the finally obtained flux-cored wire is 1.2mm;
and 5: and after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for later use.
The flux-cored wire prepared in example 1 was used to weld a T91-TP304H dissimilar material, and a V-groove was formed, in which the groove angle on the T91 side was 30 ° and the groove angle on the TP304H side was 20 °. The welding is carried out in a multilayer and multi-channel mode, TIG welding is selected as a welding method, welding current is selected to be 80-120A, and interlayer temperature is controlled to be 100-150 ℃.
Through tests, the mechanical properties of the welding joint are as follows: the tensile strength is 701MPa, the elongation after fracture is 20 percent, and the room temperature impact toughness is 90J.
Example 2
Step 1: respectively weighing 50% of Cr powder, 20% of Mo powder, 13% of Nb powder, 10% of V powder, 3% of ferromanganese powder, 2% of ferrosilicon powder, 1% of Al powder and 1% of Cu powder according to the mass percent, wherein the sum of the mass percentages of the components is 100%;
step 2: placing the alloy powder weighed in the step 1 into a vacuum heating furnace for heating, wherein the heating temperature is 300 ℃, the heat preservation time is 1h, and removing crystal water in the powder; placing the dried medicinal powder into a powder mixing machine for fully mixing for 0.5h;
and 3, step 3: removing grease on the surface of the pure nickel strip by using alcohol, wrapping the medicinal powder prepared in the step (2) in the pure nickel strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing grinding tool is 2.5mm;
and 4, step 4: after the first procedure is finished, the aperture of the grinding tool is changed to 2.3mm,2.2mm,2.1mm,2.0mm,1.9mm,1.8mm,1.7mm,1.6mm,1.5mm,1.4mm,1.3mm and 1.2mm in turn, and the diameter of the finally obtained flux-cored wire is 1.2mm;
and 5: and after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for later use.
The flux-cored wire prepared in example 2 was used to weld different materials of T91 to TP304H, and V-grooves were formed, in which the groove angle on the T91 side was 30 ° and the groove angle on the TP304H side was 20 °. Welding is carried out in a multilayer and multi-channel mode, TIG welding is selected as a welding method, welding current is selected from 80 to 120A, and interlayer temperature is controlled to be 100 to 150 ℃.
Through testing, the mechanical properties of the welding joint are as follows: the tensile strength is 731MPa, the elongation after fracture is 22 percent, and the room-temperature impact toughness is 94J.
The appearance of the interface between the T91 and the weld joint of the flux-cored wire prepared in example 2 and the T91-TP304H dissimilar material is shown in fig. 2, and it can be seen from the figure that a martensite structure appears at the T91 position after corrosion by 4% nitric acid alcohol due to the difference in corrosion resistance between T91 and TP304, and a structure does not appear at the weld joint after corrosion by 4% nitric acid alcohol due to the fact that a pure nickel strip is adopted as a welding skin, the Ni content is high, the corrosion resistance is strong. FIG. 3 is a structural morphology of a weld joint after being corroded by aqua regia (a mixture of concentrated hydrochloric acid HCl and concentrated nitric acid HNO3 according to a volume ratio of 3. FIG. 4 is a microstructure of a longitudinal section of a weld, from which it can be seen that the cross section of the columnar dendrites in FIG. 3 is an equiaxed structure. FIG. 5 shows the fracture morphology after the weld impact test, which shows that the weld mainly comprises the bremsstrahlung and has better toughness.
Example 3
Step 1: respectively weighing 47% of Cr powder, 18% of Mo powder, 14% of Nb powder, 9% of V powder, 4% of ferromanganese powder, 3% of ferrosilicon powder, 2% of Al powder and 3% of Cu powder according to the mass percent, wherein the sum of the mass percent of the components is 100%;
and 2, step: placing the alloy powder weighed in the step 1 into a vacuum heating furnace for heating, wherein the heating temperature is 280 ℃, the heat preservation time is 0.7h, and removing crystal water in the powder; putting the dried medicinal powder into a powder mixing machine for fully mixing for 0.4h;
and step 3: removing grease on the surface of the pure nickel strip by adopting alcohol, wrapping the medicinal powder prepared in the step (2) in the pure nickel strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing grinding tool is 2.5mm;
and 4, step 4: after the first procedure is finished, the aperture of the grinding tool is changed to 2.3mm,2.2mm,2.1mm,2.0mm,1.9mm,1.8mm,1.7mm,1.6mm,1.5mm,1.4mm,1.3mm and 1.2mm in turn, and the diameter of the finally obtained flux-cored wire is 1.2mm;
and 5: and after the flux-cored wire is drawn, winding the flux-cored wire on a wire reel through a wire winding machine, and finally sealing the flux-cored wire in a flux-cored wire vacuum packaging bag for later use.
The flux-cored wire prepared in example 3 was used to weld a T91-TP304H dissimilar material, and a V-groove was formed, in which the groove angle on the T91 side was 30 ° and the groove angle on the TP304H side was 20 °. The welding is carried out in a multilayer and multi-channel mode, TIG welding is selected as a welding method, welding current is selected to be 80-120A, and interlayer temperature is controlled to be 100-150 ℃.
Through tests, the mechanical properties of the welding joint are as follows: the tensile strength is 722MPa, the elongation after fracture is 23 percent, and the room temperature impact toughness is 89J.
Example 4
Step 1: respectively weighing 48% of Cr powder, 17.5% of Mo powder, 14.5% of Nb powder, 8% of V powder, 3.5% of ferromanganese powder, 3.5% of ferrosilicon powder, 2.5% of Al powder and 2.5% of Cu powder according to the mass percent, wherein the sum of the mass percent of the components is 100%;
step 2: heating the alloy powder weighed in the step 1 in a vacuum heating furnace at the heating temperature of 270 ℃ for 0.8h, and removing crystal water in the powder; placing the dried medicinal powder into a powder mixing machine for fully mixing for 0.35h;
and step 3: removing grease on the surface of the pure nickel strip by using alcohol, wrapping the medicinal powder prepared in the step (2) in the pure nickel strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing grinding tool is 2.5mm;
and 4, step 4: after the first procedure is finished, the aperture of the grinding tool is changed to 2.3mm,2.2mm,2.1mm,2.0mm,1.9mm,1.8mm,1.7mm,1.6mm,1.5mm,1.4mm,1.3mm and 1.2mm in turn, and the diameter of the finally obtained flux-cored wire is 1.2mm;
and 5: and after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for later use.
The flux-cored wire prepared in example 4 was used to weld a T91-TP304H dissimilar material, and a V-groove was formed, in which the groove angle on the T91 side was 30 ° and the groove angle on the TP304H side was 20 °. Welding is carried out in a multilayer and multi-channel mode, TIG welding is selected as a welding method, welding current is selected from 80 to 120A, and interlayer temperature is controlled to be 100 to 150 ℃.
Through tests, the mechanical properties of the welding joint are as follows: the tensile strength is 739MPa, the elongation after fracture is 22%, and the room-temperature impact toughness is 94J.
Example 5
Step 1: respectively weighing 46.5% of Cr powder, 20% of Mo powder, 15% of Nb powder, 8.5% of V powder, 4.5% of ferromanganese powder, 2.5% of ferrosilicon powder, 1.5% of Al powder and 1.5% of Cu powder according to the mass percent, wherein the sum of the mass percent of the components is 100%;
step 2: heating the alloy powder weighed in the step 1 in a vacuum heating furnace at 290 ℃ for 0.9h, and removing crystal water in the powder; placing the dried medicinal powder into a powder mixing machine for fully mixing for 0.45h;
and step 3: removing grease on the surface of the pure nickel strip by using alcohol, wrapping the medicinal powder prepared in the step (2) in the pure nickel strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing grinding tool is 2.5mm;
and 4, step 4: after the first procedure is finished, the aperture of the grinding tool is changed to 2.3mm,2.2mm,2.1mm,2.0mm,1.9mm,1.8mm,1.7mm,1.6mm,1.5mm,1.4mm,1.3mm and 1.2mm in turn, and the diameter of the finally obtained flux-cored wire is 1.2mm;
and 5: and after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for later use.
The flux-cored wire prepared in example 5 was used to weld different materials of T91 to TP304H, and V-grooves were formed, in which the groove angle on the T91 side was 30 ° and the groove angle on the TP304H side was 20 °. The welding is carried out in a multilayer and multi-channel mode, TIG welding is selected as a welding method, welding current is selected to be 80-120A, and interlayer temperature is controlled to be 100-150 ℃.
Through testing, the mechanical properties of the welding joint are as follows: the tensile strength is 737MPa, the elongation after fracture is 26 percent, and the room temperature impact toughness is 95J.
Claims (2)
1. The welding wire for welding the T91-TP304H dissimilar materials is characterized by comprising a flux core and a welding skin, wherein the flux powder comprises the following components in percentage by mass: 45-50% of Cr powder, 17-20% of Mo powder, 13-15% of Nb powder, 8-10% of V powder, 3-5% of ferromanganese powder, 2-4% of ferrosilicon powder, 1-3% of Al powder and 1-3% of Cu powder, wherein the sum of the mass percentages of the components is 100%;
the purity of eight metal powders contained in the medicinal powder is more than or equal to 99.9 percent, and the granularity of the eight metal powders is 200 meshes;
the welding skin adopts a pure nickel strip, the thickness of the pure nickel strip is 0.3mm, and the width of the pure nickel strip is 7mm;
the filling amount of the flux-cored wire is controlled to be 35-40 wt%.
2. The method for preparing the welding wire for welding the T91-TP304H dissimilar materials, which is disclosed by claim 1, is characterized by comprising the following specific steps of:
step 1: respectively weighing 45-50% of Cr powder, 17-20% of Mo powder, 13-15% of Nb powder, 8-10% of V powder, 3-5% of ferromanganese powder, 2-4% of ferrosilicon powder, 1-3% of Al powder and 1-3% of Cu powder according to the mass percent, wherein the sum of the mass percent of the components is 100%;
step 2: heating the powder weighed in the step 1 in a vacuum heating furnace at 260-300 ℃ for 0.5-1h, and removing crystal water in the powder; placing the dried medicinal powder into a powder mixer for fully mixing for 0.3-0.5h;
and step 3: removing grease on the surface of the pure nickel strip by adopting alcohol, wrapping the medicinal powder prepared in the step (2) in the pure nickel strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing die is 2.5mm;
and 4, step 4: after the drawing of the first procedure is finished, the pore diameters of the dies are changed to 2.3mm,2.2mm,2.1mm,2.0mm,1.9mm,1.8mm,1.7mm,1.6mm,1.5mm,1.4mm,1.3mm and 1.2mm in sequence, and the diameter of the finally obtained flux-cored wire is 1.2mm;
and 5: and after the flux-cored wire is drawn, winding the flux-cored wire on a wire reel through a wire winding machine, and finally sealing the flux-cored wire in a flux-cored wire vacuum packaging bag for later use.
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| CN104959746A (en) * | 2015-04-18 | 2015-10-07 | 盐城市成功机械制造有限公司 | Self-shielded flux-cored wire for extrusion roller remanufacturing |
| CN109940308B (en) * | 2019-04-24 | 2021-05-25 | 西安理工大学 | Iron-based welding wire for laser cladding and preparation method thereof |
| CN110216398A (en) * | 2019-05-24 | 2019-09-10 | 西安理工大学 | A kind of fan impeller blade gas shielded metal flux-cored wire |
| CN112453758B (en) * | 2020-10-29 | 2022-04-29 | 西安理工大学 | Welding wire for graphene-enhanced TA1-Q345 middle layer and preparation method |
| CN113182731B (en) * | 2021-05-08 | 2023-04-18 | 广西辉煌耐磨技术股份有限公司 | High-performance hard-face surfacing flux-cored wire |
| CN113732560B (en) * | 2021-08-23 | 2023-03-14 | 西安理工大学 | Nickel-chromium-based welding wire capable of effectively controlling heat cracking, method and groove form |
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2021
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