CN109877485B - Welding method of composite steel plate of coal scuttle in power plant - Google Patents
Welding method of composite steel plate of coal scuttle in power plant Download PDFInfo
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Abstract
The invention discloses a welding method of a composite steel plate of a coal scuttle of a power plant, which comprises the following steps: checking raw materials; groove machining; assembling; positioning welding; performing primary welding on the truncated edge of the base layer on one side of the base layer to obtain a first welding line; carrying out second welding in the first groove to obtain a second welding seam, then carrying out third welding in the first groove, and fully welding the first groove to obtain a third welding seam; performing fourth welding on the bottom of the second groove on one side of the composite layer to obtain a transition layer with the thickness of 2-3 mm, wherein the transition layer covers the interface of the composite layer and the base layer; and fully welding the second groove to obtain a fifth welding seam. The invention adopts reasonable welding process measures, welding methods, welding parameters, welding sequence and the like, effectively monitors the welding process, can well ensure the welding construction quality of the composite steel plate of the steel coal scuttle, and can meet the requirements of mechanical property and corrosion resistance of a welding seam.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a welding method of a coal scuttle composite steel plate of a power plant.
Background
Stainless steel clad steel board includes basic unit (material Q235B, thickness 14mm) and composite bed (material 1Cr13, thickness 3mm), and stainless steel clad steel board wide application is in the former feed bin of power plant, compares in other compound or polycrystalline material, and its advantage has: firstly, the coating has corrosion resistance, wear resistance and diamagnetism; secondly, the steel has high strength and low cost of carbon steel or low alloy steel; and thirdly, the stainless steel composite plate is adopted to manufacture the steel coal hopper, and compared with the traditional mode of directly welding the stainless steel thin plate on the carbon steel wall plate in a plug welding manner, a large amount of manpower is saved, and the construction period is shortened.
The coal scuttle of the power plant is formed by welding the composite steel plates together, and the design requirement is that the quality grade of welding seams is not lower than two grades. The composite steel plate is special in material, if a conventional welding mode is adopted, the welding seam is difficult to meet the design requirement, and the composite layer is easily polluted by external iron and carbon elements to influence the corrosion resistance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a welding method of a coal scuttle composite steel plate of a power plant, which can ensure the quality of a welding seam and can ensure that the composite layer is polluted in the welding process to influence the corrosion resistance.
The technical scheme adopted by the invention for solving the technical problem is as follows: the welding method of the composite steel plate of the coal scuttle of the power plant comprises the following steps:
A. raw material inspection:
B. groove machining: blanking, namely processing a first groove at the welding end of the base layer, and reserving a truncated edge with the thickness of 1-2 mm at one side of the base layer close to the composite layer; processing a second groove at the welding end of the composite layer, wherein the processing direction of the second groove is from the composite layer to the base layer, and the bottom of the second groove is connected with the truncated edge;
C. assembling: aligning the grooves of two composite steel plates to be welded by taking the composite layer as a reference, wherein the butt gap is 2-4 mm, and the misalignment amount of the composite layer is less than 1 mm;
D. positioning welding: performing tack welding at the bottom of the first groove of the base layer;
E. welding:
e1, performing first welding on the truncated edge of the base layer on one side of the base layer to obtain a first welding line;
e2, carrying out second welding in the first groove to obtain a second welding seam, then carrying out third welding in the first groove, and fully welding the first groove to obtain a third welding seam;
e3, performing fourth welding on the bottom of the second groove on one side of the composite layer to obtain a transition layer with the thickness of 2-3 mm, wherein the transition layer covers the interface between the composite layer and the base layer;
e4, fully welding the second groove to obtain a fifth welding seam.
Further, in the step E1, welding is carried out by using an E5015 welding rod with the diameter of 3.2mm, the welding current is 120 to 135A, the voltage is 20 to 24V, and the welding speed is 70 to 85 mm/min;
in the step E2, welding is carried out by adopting an ER50-6 welding wire with the diameter of 1.2mm, the welding current of a second welding line is 185-210A, the voltage is 22-26V, and the welding speed is 95-110 mm/min; the welding current of the third welding seam is 185-210A, the voltage is 22-26V, and the welding speed is 115-125 mm/min;
in the step E3, welding is carried out by adopting an A302 welding rod with the diameter of 3.2mm, the welding current is 115-215A, the voltage is 28-33V, and the welding speed is 120-135 mm/min;
in step E4, welding is carried out by using an A302 welding rod with the diameter of 3.2mm, the welding current is 115-120A, the voltage is 28-30V, and the welding speed is 110-120 mm/min.
Further, after the step E2 is finished, performing ultrasonic UT detection on the welding seam, if the welding seam has defects, polishing the welding seam on the side of the base layer, and then performing repair welding by using an E5015 welding rod until the welding seam meets the requirements, and then performing the step E3;
after the step E3 is finished, detecting all finished welding seams by adopting an ultrasonic UT or penetration coloring PT method, if a defect occurs in the base layer, polishing the welding seams at the side of the base layer, and then performing repair welding by utilizing an E5015 welding rod; if a defect occurs between the base layer and the transition layer, polishing the welding line on the side of the base layer, and then performing repair welding by using an A302 welding rod; if the transition layer has defects, polishing the transition layer by using an alloy polishing sheet on the composite layer side, and then performing repair welding by using an A302 welding rod; after the defect is eliminated, the step E4 is performed;
and E4, detecting the fifth welding seam by adopting a penetration coloring PT method, if the fifth welding seam has defects, polishing the fifth welding seam by utilizing an alloy polishing sheet, and then performing repair welding by utilizing an A302 welding rod.
Further, in step E4, gouging is performed first, and then welding is performed.
Further, in steps E3 and E4, lime powder is coated on the surface of the composite layer on both sides of the weld, and then welding is performed.
Further, in the step A, the appearance of the composite steel plate raw material is checked, air holes, cracks and interlayers cannot be formed on the surface, and the surface of the composite layer cannot be contacted with carbon steel or low alloy steel; and then sampling the composite steel plate raw material, and detecting whether each index of the sample meets the design specification requirement.
And further, in the step B, blanking and groove machining are carried out by utilizing a plasma cutting machine, and in the process, the flow direction of scrap iron is controlled, so that the scrap iron is prevented from being sprayed to the composite layer.
Further, in the step C, after the grooves of the two composite steel plates to be welded are aligned, the angle between the first grooves of the two composite steel plates is 60 to 65 degrees, and the angle between the second grooves of the two composite steel plates is 30 degrees.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts reasonable welding process measures, welding methods, welding parameters, welding sequence and the like, effectively monitors the welding process, can well ensure the welding construction quality of the composite steel plate of the steel coal scuttle, and can meet the requirements of mechanical property and corrosion resistance of a welding seam.
Drawings
FIG. 1 is a schematic diagram of a bevel;
FIG. 2 is a schematic illustration of an assembly;
FIG. 3 is a schematic view after completion of a first weld;
FIG. 4 is a schematic view after a second weld is completed;
FIG. 5 is a schematic view after a third weld is completed;
FIG. 6 is a schematic view after completion of the transition layer;
FIG. 7 is a schematic view after a fifth weld is completed;
reference numerals: 100-a base layer; 110 — a first bevel; 120-blunt edge; 200-a composite layer; 210 — a second bevel; 10-first weld; 20-second weld; 30-third weld; 40-a transition layer; 50-fifth weld.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The invention discloses a welding method of composite steel plates of a coal scuttle of a power plant, which comprises the following steps of:
A. raw material inspection: after the composite steel plate raw material is transported to a processing field, firstly, a material certificate and chemical element percentage data of steel are checked, and all performance indexes meet the requirements of design drawings and standard specifications; secondly, performing appearance inspection on the composite steel plates one by one, storing the composite steel plates in a specified area without defects of air holes, cracks, interlayers and the like on the surfaces, padding battens between the plates, and strictly prohibiting the surface of the composite layer 200 from contacting carbon steel or low alloy steel so as to avoid the composite layer 200 from being carbonized and polluted; finally, sampling test is carried out on the batch of composite steel plates according to the standard requirements, and whether the indexes such as hardness, strength, bending and the like meet the design standard requirements is tested again.
B. Groove machining:
and cutting and blanking by using a plasma cutting machine.
Upwards processing a first groove 110 at the welding end of the base layer 100 by using a plasma cutting machine, and reserving a blunt edge 120 with the thickness of 1-2 mm at one side of the base layer 100 close to the composite layer 200; turning over the composite steel plate to make the composite layer 200 face upwards, and processing a second bevel 210 at the welding end of the composite layer 200, wherein the processing direction of the second bevel 210 is from the composite layer 200 to the base layer 100, the bottom of the second bevel 210 is connected with the truncated edge 120, and the shape of the bevel is shown in fig. 1. The processing amount of the groove meets the following requirements: after the bevels of the two clad steel plates to be welded are aligned, the angle between the first bevels 110 of the two clad steel plates is 60 to 65 degrees, and the angle between the second bevels 210 of the two clad steel plates is 30 degrees. The groove with the structure and the size can meet the following requirements: firstly, the requirement of a welding mode; secondly, the filling metal of the welding seam is reduced as much as possible; avoiding generating defects; fourthly, reducing the residual welding stress; the dilution rate of transition weld metal is favorably reduced; sixthly, welding protection is facilitated; the operation of the welder is convenient, etc.
In the process of blanking and groove machining, the flow direction of the scrap iron should be controlled, so that the scrap iron is prevented from being sprayed to the composite layer 200 to damage the composite layer 200, and the composite layer 200 can keep enough strength, corrosion resistance and the like.
And after the groove is formed, the groove is polished to achieve smooth surface without cracks and layering. The second groove 210 can be polished only by an alloy polishing sheet to prevent the stainless steel composite layer 200 from being contaminated by carbonization, and the first groove 110 and the blunt edge 120 can be polished by polishing sheets of various materials.
C. Assembling: as shown in FIG. 2, the grooves of two composite steel plates to be welded are aligned with each other based on the composite layer 200, and it should be noted that the groove pair is a gap, and if the gap is too large or too small, the welding quality of the transition layer 40 will be affected, and the gap is 2 to 4mm, preferably about 3 mm. If the misalignment amount is too large, cracks are likely to be generated after welding or the welding seam of the composite layer 200 is rusted after welding, which has a great influence on welding and can not ensure welding quality, so that the misalignment amount, particularly the misalignment amount of the composite layer 200, should be strictly controlled during assembly, and the misalignment amount of the composite layer 200 is less than 1 mm.
D. Positioning welding: the E5015 welding rod with the diameter of 3.2mm is used for positioning welding at the bottom of the first groove 110 of the base layer 100, and the positioning welding cannot be carried out on the composite layer 200. The effective length of the tack welds is no less than 30 mm. In the welding process, the quality of the weld joint of the tack welding is noticed, if cracks appear, the weld joint with the cracks is immediately treated, and the weld joint with the cracks is ground off and then welded again to ensure the quality of the tack welding.
E. Welding: the surfaces of the base layer 100 and the composite layer 200 are cleaned before welding, and different steel wire brushes or polishing methods are adopted according to different materials of the base layer 100 and the composite layer 200 to remove substances which affect the welding quality, such as surface oxides, rust, oil, moisture and the like, so that the surfaces of the base layer 100 and the composite layer 200 are bright.
E1, performing a first welding on the base layer 100 at the blunt edge 120 of the base layer 100, and obtaining a first welding seam 10, as shown in fig. 3. Specifically, welding was carried out using an E5015 electrode having a diameter of 3.2mm, a welding current of 120 to 135A, a voltage of 20 to 24V, and a welding speed of 70 to 85 mm/min. The thickness of the first weld seam 10 is equal to the thickness of the blunt edge 120. And after welding, performing appearance inspection on the first welding seam 10, and polishing the first welding seam after the appearance inspection is qualified.
E2, performing a second weld in the first groove 110 to obtain a second weld 20, as shown in fig. 4. Then, a third welding is performed in the first groove 110, and the first groove 110 is fully welded to obtain a third weld 30, as shown in fig. 5. Specifically, ER50-6 welding wire with the diameter of 1.2mm is adopted for welding, the welding current of the second welding seam 20 is 185-210A, the voltage is 22-26V, and the welding speed is 95-110 mm/min; the welding current of the third welding seam 30 is 185-210A, the voltage is 22-26V, and the welding speed is 115-125 mm/min. The thickness of the second weld 20 is similar to the thickness of the third weld 30.
And (3) carrying out ultrasonic UT detection on the welding line in the base layer 100, if the welding line has defects, polishing the welding line on the side of the base layer 100, and then carrying out repair welding by using an E5015 welding rod with the diameter of 3.2mm until the welding line meets the requirements.
The steps E1 and E2 are welding of the base layer 100, transverse swing is reduced as much as possible during welding, the welding is divided into 3 times of welding, the composite layer 200 can be prevented from being melted during welding as much as possible, and if metal of the composite layer 200 is melted into a welding seam in the base layer 100, welding cracks can be generated, and welding quality is affected. The E5015 welding rod is a low-hydrogen sodium type low-alloy structural steel welding rod, has higher performance than a carbon steel welding rod, and can increase the tensile strength of the first welding line 10. The ER50-6 welding rod is a carbon steel welding wire, is consistent with the material of the base layer 100, and is combined with the base layer 100 after being melted, so that the base layers 100 of the two clad steel plates can be connected, and the welding connection strength is ensured.
E3, on one side of the composite layer 200, lime powder is coated on the surface of the composite layer 200 on both sides of the welding seam, so that the situation that the composite layer 200 is damaged due to the fact that molten metal is sputtered onto the surface of the composite layer 200 during welding can be avoided, and the strength and the corrosion resistance of the composite layer 200 are guaranteed. A fourth welding is then performed at the bottom of the second bevel 210 to obtain a transition layer 40 with a thickness of 2 to 3mm, and the transition layer 40 covers the interface between the composite layer 200 and the base layer 100, as shown in fig. 6. On the premise of ensuring good fusion, the welding line energy is strictly controlled, and small welding rods, small currents, narrow welding beads and rapid welding are adopted for welding so as to reduce the fusion ratio and reduce the fusion amount of metal of the composite layer 200 as much as possible, thereby reducing the probability of cracks and ensuring the strength of welding seams. Specifically, welding was carried out using an A302 electrode having a diameter of 3.2mm, a welding current of 115 to 215A, a voltage of 28 to 33V, and a welding speed of 120 to 135 mm/min. The thickness of the transition layer 40 should not be too large, and the fusion ratio of the weld is increased when the transition layer 40 is thick, and weld cracks are likely to occur, so that the thickness of the transition layer 40 is controlled to be 2 to 3 mm.
Detecting all finished welding seams by adopting an ultrasonic UT (ultrasonic) or penetration coloring PT (potential Transformer) method, if a defect occurs in the base layer 100, polishing the welding seams on the side of the base layer 100, and then performing repair welding by utilizing an E5015 welding rod; if a defect occurs between the base layer 100 and the transition layer 40, polishing the welding line on the side of the base layer 100, and then performing repair welding by using an A302 welding rod; if a defect occurs in the transition layer 40, the transition layer 40 is ground using an alloy grinding sheet on the side of the composite layer 200, and then repair-welded using an a302 welding rod to remove the defect.
E4, lime powder is coated on the surface of the composite layer 200 on both sides of the welding seam, so that the situation that the composite layer 200 is damaged due to the fact that molten metal is sputtered onto the surface of the composite layer 200 during welding can be avoided, and the strength and the corrosion resistance of the composite layer 200 are guaranteed. And then, carrying out gouging by using an air gouging to prevent incomplete penetration, planing till the welding line of the transition layer 40 is exposed, and then thoroughly polishing and smoothing the gouging surface by using an alloy polishing sheet.
And after the fifth welding seam 50 is finished, detecting the fifth welding seam 50 by adopting a penetration coloring PT method, if the fifth welding seam 50 has defects, polishing the fifth welding seam 50 by utilizing an alloy polishing sheet, and then performing repair welding by utilizing an A302 welding rod.
In the above steps E3 and E4, the welding is performed by using the a302 welding rod, and the a302 welding rod is a stainless steel welding rod, so that the stainless steel composite layer 200 can be stably connected.
After each welding line is finished, the welding line is subjected to appearance detection or nondestructive inspection, defects in the welding line can be found in time, the next welding line is welded after the defects are repaired, the welding quality can be strictly controlled, and the problem that the repair difficulty is too large due to accumulation of the defects is avoided.
Example one
After the composite steel plate raw material is inspected, processing a first groove 110 at the welding end of the base layer 100 by using a plasma cutting machine, and reserving a blunt edge 120 with the thickness of 1-2 mm at one side of the base layer 100 close to the composite layer 200; the clad steel plate is turned upside down to make the clad layer 200 face upward, and a second groove 210 is formed at the welding end of the clad layer 200.
And aligning the grooves of the two composite steel plates to be welded by taking the composite layer 200 as a reference, aligning the alignment gap with 3mm, and performing tack welding after the misalignment amount is less than 1 mm.
And (3) carrying out primary welding on the truncated edge 120 of the base layer 100 by adopting an E5015 welding rod with the diameter of 3.2mm to obtain a first welding seam 10, wherein the welding current is 120A, the voltage is 20V, and the welding speed is 70 mm/min. And (4) performing appearance inspection after welding, and polishing off the welding line at the defect position and performing repair welding if the defect exists.
And performing second welding in the first groove 110 by using an ER50-6 welding wire with the diameter of 1.2mm to obtain a second welding seam 20, wherein the welding current is 185A, the voltage is 22V, and the welding speed is 95 mm/min. And (4) performing appearance inspection after welding, and polishing off the welding line at the defect position and performing repair welding if the defect exists. And then, carrying out third welding in the first groove 110, and fully welding the first groove 110 to obtain a third welding seam 30, wherein the welding current is 185A, the voltage is 22V, and the welding speed is 115 mm/min. And (4) performing appearance inspection and nondestructive inspection after welding, and polishing off the welding line at the defect position and performing repair welding when the defect exists.
Performing fourth welding on the bottom of the second groove 210 at one side of the composite layer 200 by using an A302 welding rod with the diameter of 3.2mm to obtain a transition layer 40 with the thickness of 2-3 mm, wherein the transition layer 40 covers the interface between the composite layer 200 and the base layer 100; the welding current was 115A, the voltage was 28V, and the welding speed was 120 mm/min. And (4) performing appearance inspection and nondestructive inspection after welding, and polishing off the welding line at the defect position and performing repair welding when the defect exists.
And fully welding the second groove 210 by using an A302 welding rod with the diameter of 3.2mm to obtain a fifth welding seam 50, wherein the welding current is 115A, the voltage is 28V, and the welding speed is 110 mm/min. And (4) performing appearance inspection and nondestructive inspection after welding, and polishing off the welding line at the defect position and performing repair welding when the defect exists.
The welding seam of the embodiment is integrally sampled and checked, and the mechanical property and the corrosion resistance meet the design requirements.
Example two
After the composite steel plate raw material is inspected, processing a first groove 110 at the welding end of the base layer 100 by using a plasma cutting machine, and reserving a blunt edge 120 with the thickness of 1-2 mm at one side of the base layer 100 close to the composite layer 200; the clad steel plate is turned upside down to make the clad layer 200 face upward, and a second groove 210 is formed at the welding end of the clad layer 200.
And aligning the grooves of the two composite steel plates to be welded by taking the composite layer 200 as a reference, aligning the alignment gap with 3mm, and performing tack welding after the misalignment amount is less than 1 mm.
And (3) carrying out primary welding on the truncated edge 120 of the base layer 100 by using an E5015 welding rod with the diameter of 3.2mm to obtain a first welding seam 10, wherein the welding current is 120-135A, the voltage is 20-24V, and the welding speed is 70-85 mm/min. And (4) performing appearance inspection after welding, and polishing off the welding line at the defect position and performing repair welding if the defect exists.
And performing second welding in the first groove 110 by using an ER50-6 welding wire with the diameter of 1.2mm to obtain a second welding seam 20, wherein the welding current is 195A, the voltage is 24V, and the welding speed is 95-100 mm/min. And (4) performing appearance inspection after welding, and polishing off the welding line at the defect position and performing repair welding if the defect exists. And then, carrying out third welding in the first groove 110, and fully welding the first groove 110 to obtain a third welding seam 30, wherein the welding current is 195A, the voltage is 24V, and the welding speed is 120 mm/min. And (4) performing appearance inspection and nondestructive inspection after welding, and polishing off the welding line at the defect position and performing repair welding when the defect exists.
Performing fourth welding on the bottom of the second groove 210 at one side of the composite layer 200 by using an A302 welding rod with the diameter of 3.2mm to obtain a transition layer 40 with the thickness of 2-3 mm, wherein the transition layer 40 covers the interface between the composite layer 200 and the base layer 100; the welding current is 170A, the voltage is 30V, and the welding speed is 128 mm/min. And (4) performing appearance inspection and nondestructive inspection after welding, and polishing off the welding line at the defect position and performing repair welding when the defect exists.
And fully welding the second groove 210 by using an A302 welding rod with the diameter of 3.2mm to obtain a fifth welding seam 50, wherein the welding current is 117A, the voltage is 28V, and the welding speed is 115 mm/min. And (4) performing appearance inspection and nondestructive inspection after welding, and polishing off the welding line at the defect position and performing repair welding when the defect exists.
The welding seam of the embodiment is integrally sampled and checked, and the mechanical property and the corrosion resistance meet the design requirements.
EXAMPLE III
After the composite steel plate raw material is inspected, processing a first groove 110 at the welding end of the base layer 100 by using a plasma cutting machine, and reserving a blunt edge 120 with the thickness of 1-2 mm at one side of the base layer 100 close to the composite layer 200; the clad steel plate is turned upside down to make the clad layer 200 face upward, and a second groove 210 is formed at the welding end of the clad layer 200.
And aligning the grooves of the two composite steel plates to be welded by taking the composite layer 200 as a reference, aligning the alignment gap with 3mm, and performing tack welding after the misalignment amount is less than 1 mm.
And (3) carrying out primary welding on the truncated edge 120 of the base layer 100 by adopting an E5015 welding rod with the diameter of 3.2mm to obtain a first welding seam 10, wherein the welding current is 135A, the voltage is 24V, and the welding speed is 85 mm/min. And (4) performing appearance inspection after welding, and polishing off the welding line at the defect position and performing repair welding if the defect exists.
And performing second welding in the first groove 110 by using an ER50-6 welding wire with the diameter of 1.2mm to obtain a second welding seam 20, wherein the welding current is 210A, the voltage is 26V, and the welding speed is 110 mm/min. And (4) performing appearance inspection after welding, and polishing off the welding line at the defect position and performing repair welding if the defect exists. And then, carrying out third welding in the first groove 110, and fully welding the first groove 110 to obtain a third welding seam 30, wherein the welding current is 210A, the voltage is 26V, and the welding speed is 125 mm/min. And (4) performing appearance inspection and nondestructive inspection after welding, and polishing off the welding line at the defect position and performing repair welding when the defect exists.
Performing fourth welding on the bottom of the second groove 210 at one side of the composite layer 200 by using an A302 welding rod with the diameter of 3.2mm to obtain a transition layer 40 with the thickness of 2-3 mm, wherein the transition layer 40 covers the interface between the composite layer 200 and the base layer 100; the welding current is 215A, the voltage is 33V, and the welding speed is 135 mm/min. And (4) performing appearance inspection and nondestructive inspection after welding, and polishing off the welding line at the defect position and performing repair welding when the defect exists.
And fully welding the second groove 210 by using an A302 welding rod with the diameter of 3.2mm to obtain a fifth welding seam 50, wherein the welding current is 120A, the voltage is 30V, and the welding speed is 120 mm/min. And (4) performing appearance inspection and nondestructive inspection after welding, and polishing off the welding line at the defect position and performing repair welding when the defect exists.
The welding seam of the embodiment is integrally sampled and checked, and the mechanical property and the corrosion resistance meet the design requirements.
Claims (7)
1. The welding method of the composite steel plate of the coal scuttle in the power plant is characterized in that the composite steel plate comprises a base layer (100) and a composite layer (200), the base layer (100) is made of Q235B and has the thickness of 14mm, the composite layer (200) is made of 1Cr13 and has the thickness of 3mm, and the welding method comprises the following steps:
A. raw material inspection:
B. groove machining: blanking, namely processing a first groove (110) at the welding end of the base layer (100), and reserving a truncated edge (120) with the thickness of 1-2 mm at one side of the base layer (100) close to the composite layer (200); processing a second groove (210) at the welding end of the composite layer (200), wherein the processing direction of the second groove (210) is from the composite layer (200) to the base layer (100), and the bottom of the second groove (210) is connected with the truncated edge (120);
C. assembling: aligning the bevels of two composite steel plates to be welded by taking the composite layer (200) as a reference, wherein the angle between the first bevels (110) of the two composite steel plates is 60-65 degrees, the angle between the second bevels (210) of the two composite steel plates is 30 degrees, the butt gap is 2-4 mm, and the misalignment amount of the composite layer (200) is less than 1 mm;
D. positioning welding: performing tack welding at the bottom of the first groove (110) of the base layer (100);
E. welding:
e1, performing first welding on the truncated edge (120) of the base layer (100) at one side of the base layer (100) to obtain a first welding seam (10);
e2, carrying out second welding in the first groove (110) to obtain a second welding seam (20), then carrying out third welding in the first groove (110), and fully welding the first groove (110) to obtain a third welding seam (30);
e3, welding for the fourth time at the bottom of the second groove (210) on one side of the composite layer (200) to obtain a transition layer (40) with the thickness of 2-3 mm, wherein the transition layer (40) covers the interface of the composite layer (200) and the base layer (100);
e4, fully welding the second groove (210) to obtain a fifth welding seam (50).
2. The welding method of the composite steel plates for the coal scuttle of the power plant according to claim 1,
in the step E1, an E5015 welding rod with the diameter of 3.2mm is adopted for welding, the welding current is 120-135A, the voltage is 20-24V, and the welding speed is 70-85 mm/min;
in the step E2, an ER50-6 welding wire with the diameter of 1.2mm is adopted for welding, the welding current of the second welding seam (20) is 185-210A, the voltage is 22-26V, and the welding speed is 95-110 mm/min; the welding current of the third welding seam (30) is 185-210A, the voltage is 22-26V, and the welding speed is 115-125 mm/min;
in the step E3, welding is carried out by adopting an A302 welding rod with the diameter of 3.2mm, the welding current is 115-215A, the voltage is 28-33V, and the welding speed is 120-135 mm/min;
in step E4, welding is carried out by using an A302 welding rod with the diameter of 3.2mm, the welding current is 115-120A, the voltage is 28-30V, and the welding speed is 110-120 mm/min.
3. The welding method of the composite steel plates for the coal scuttle of the power plant according to claim 2,
after the step E2 is finished, carrying out ultrasonic UT detection on the welding seam, if the welding seam has defects, polishing the welding seam on the side of the base layer (100), and then carrying out repair welding by using an E5015 welding rod until the welding seam meets the requirements, and then carrying out the step E3;
after the step E3 is finished, detecting all finished welding seams by adopting an ultrasonic UT or penetration coloring PT method, if a defect occurs in the base layer (100), grinding the welding seams at the side of the base layer (100), and then performing repair welding by utilizing an E5015 welding rod; if a defect occurs between the base layer (100) and the transition layer (40), polishing the welding line on the side of the base layer (100), and then performing repair welding by using an A302 welding rod; if the transition layer (40) has defects, polishing the transition layer (40) by using an alloy polishing sheet on the side of the composite layer (200), and then performing repair welding by using an A302 welding rod; after the defect is eliminated, the step E4 is performed;
and E4, detecting the fifth welding seam (50) by adopting a penetration coloring PT method, polishing the fifth welding seam (50) by utilizing an alloy polishing sheet if a defect exists, and then performing repair welding by utilizing an A302 welding rod.
4. The method for welding the composite steel plates for the coal scuttle of a power plant according to claim 1, wherein in step E4, the back chipping is performed by using an air gouging and then the welding is performed.
5. The method for welding the composite steel plates of the coal scuttle of the power plant according to claim 1, wherein in the steps E3 and E4, lime powder is coated on the surfaces of the composite layers (200) at both sides of the weld, and then welding is performed.
6. The method for welding the composite steel plates of the coal scuttles of the power plant according to claim 1, wherein in the step A, the raw materials of the composite steel plates are subjected to appearance inspection, the surfaces of the composite steel plates are not provided with pores, cracks and interlayers, and the surfaces of the composite layers (200) are not contacted with carbon steel or low alloy steel; and then sampling the composite steel plate raw material, and detecting whether each index of the sample meets the design specification requirement.
7. The method for welding the composite steel plates of the coal scuttle in the power plant according to claim 1, wherein in the step B, the plasma cutting machine is used for blanking and beveling, and in the process, the flow direction of the scrap iron is controlled to avoid the scrap iron from spraying to the composite layer (200).
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| CN112575625A (en) * | 2019-09-27 | 2021-03-30 | 比亚迪股份有限公司 | Butt welding plate group, turnout beam and processing method of butt welding plate group |
| CN110695489A (en) * | 2019-10-22 | 2020-01-17 | 湖北理工学院 | Composite steel plate welding method |
| CN110900049A (en) * | 2019-12-13 | 2020-03-24 | 武船重型工程股份有限公司 | Welding method and welding system |
| CN111590223A (en) * | 2020-05-22 | 2020-08-28 | 中国石油天然气集团有限公司 | Welding method of titanium steel composite plate |
| CN112008194A (en) * | 2020-08-25 | 2020-12-01 | 江苏焱鑫科技股份有限公司 | Welding process of composite steel plate |
| CN114985884B (en) * | 2022-06-01 | 2023-09-19 | 中船黄埔文冲船舶有限公司 | Method for shielding numerical control cutting groove |
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