Tailor welding method for manufacturing narrow and long alloy bar

Abstract

A tailor-welding method for manufacturing narrow and long alloy bars comprises the steps that firstly, an I-shaped intermediate alloy bar and a T-shaped end alloy bar are machined, and the flatness of the butt joint side faces of the alloy bars meets the requirement; secondly, the two alloy strips needing to be tailor-welded are placed in the corresponding grooves of the tool platform, and the gap value of the butt joint position of the two alloy strips meets the requirement; thirdly, the alloy strips in the grooves of the tool platform are fixed to the tool platform through pressing blocks and compression bolts; fourthly, the butt joint position of the two alloy strips is subjected to friction stir welding; fifthly, the remaining alloy bars are assembled again, and the operation from the second step to the fourth step is repeated till all the alloy bars are welded; and sixthly, after the tailor welding of the alloy bars is completed, redundant parts are machined off on a machine tool. Therefore, the splicing welding seam quality of the narrow and long alloy strip manufactured through the design is good.

Description

Technical Field

[0001] The invention relates to a butt welding method, belongs to the field of alloy material processing, and in particular to a butt welding method for manufacturing narrow and long alloy strips. Background Art

[0002] At present, due to process limitations, narrow and long alloy strips cannot be formed at one time, and multiple alloy strips need to be welded together using stir friction welding. Stir friction welding is a solid-phase connection method under the action of mechanical force and friction heat, which is widely used in aerospace, automobiles, rail trains, electronic products, ships and other fields; because in the process of stir friction welding, the stirring head needs to drive the stirring needle to rotate and insert into the workpiece to be welded, and a keyhole will be left on the workpiece when the stirring head is pulled out at the end of welding, and it is difficult to repair the weld. At present, in order to avoid leaving a keyhole on the workpiece when the stirring needle is pulled out, welding transition plates are added on both sides of the weld during welding. However, due to the interface between the alloy strip and the welding transition plate, the plastic metal flow field here is unstable during welding, and the stress concentration is large, which will cause defects similar to cracks at the edge of the weld; in addition, due to the vibration of the equipment during the welding process, the depth of the stirring needle inserted into the workpiece fluctuates, resulting in local incomplete penetration defects on the lower surface of the weld, which ultimately leads to unqualified weld quality.

[0003] The Chinese patent application with application number 202010545226.5 and application date June 16, 2020, discloses a method for continuous splicing of aluminum alloy plates with good connection effect. Step 1, advance preparation of aluminum alloy plates: select aluminum alloy plates of suitable thickness, flatten them, and the overall horizontal error is less than 0.5 degrees, then place the aluminum alloy plates for standby, and then prepare the connecting aluminum bars that have been previously injection molded, and the number of connecting aluminum bars is the same as the number of aluminum alloy plates; Step 2, preliminary processing of the plates: transport the aluminum alloy plates to the welding table; when welding, groove the aluminum alloy plates in advance, and then use the connecting aluminum bars as welding rods. When welding is performed by a stir friction welding device, the connecting aluminum bars melt quickly and fill in between the two aluminum alloy plates, so that the aluminum alloy plates can be quickly connected together. Although this patent does not produce hollows at the welding point and has a good connection effect, it still has the following defects: The quality of the weld seams of the alloy strips produced by this design is poor.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of this patent application, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects and problems of poor quality of alloy strip splicing welds in the prior art, and to provide a method for welding alloy strips with better quality of splicing welds for making narrow and long alloy strips.

[0006] To achieve the above objectives, the technical solution of the present invention is: a method for welding a narrow and long alloy strip, the method for welding a narrow and long alloy strip comprising the following steps: The first step: first process the alloy strips to be welded, and after the alloy strips are processed, respectively detect the flatness of the butt joint side of each alloy strip, and when the flatness is qualified, proceed to the next step, and when the flatness is unqualified, grind the butt joint side of each alloy strip until the flatness is qualified, and then proceed to the next step; The intermediate alloy strip is located in the middle of the splicing, and the end alloy strips are located at both ends; the intermediate alloy strip is I-shaped, and includes a first splicing portion, a second splicing portion, and a connecting portion. The first splicing portion, the second splicing portion, and the connecting portion are all rectangular parallelepipeds. In the thickness direction, the upper and lower portions of the first splicing portion are respectively thicker than the connecting portion by A, in the length direction, the length of the first splicing portion is L1, and in the width direction, the front and rear portions of the first splicing portion are respectively thicker than the connecting portion by L2, and the second splicing portion is the same as the first splicing portion; the end alloy strip is T-shaped, and includes a splicing portion and an end portion. The splicing portion and the end portion are rectangular parallelepipeds, and the splicing portion is the same as the first splicing portion and the second splicing portion; the width of the end portion, the connecting portion, and the alloy strip is consistent, the thickness of the end portion, the connecting portion, and the alloy strip is consistent, the sum of the lengths of the first splicing portion, the second splicing portion, and the connecting portion is consistent with the length of the alloy strip, and the sum of the lengths of the splicing portion and the end portion is consistent with the length of the alloy strip; Step 2: When welding the end alloy bar and the middle alloy bar, place the end alloy bar and the middle alloy bar in the grooves corresponding to the tooling platform respectively, and then check the gap value at the joint between the end alloy bar and the middle alloy bar. When the gap value at the joint meets the requirements, proceed to the next step. When the gap value at the joint does not meet the requirements, adjust the relative position of the end alloy bar and the middle alloy bar until the gap value meets the requirements, and then proceed to the next step; When welding two middle alloy bars, place the two middle alloy bars in the grooves corresponding to the tooling platform respectively, and then check the gap value at the joint between the two middle alloy bars. When the gap value at the joint meets the requirements, proceed to the next step. When the gap value at the joint does not meet the requirements, adjust the relative position of the two middle alloy bars until the gap value meets the requirements, and then proceed to the next step; Step 3: When welding the end alloy bar and the intermediate alloy bar, use a pressing block and a clamping bolt to fix the end alloy bar and the intermediate alloy bar on the tooling platform respectively; when welding two intermediate alloy bars, use a pressing block and a clamping bolt to fix the two intermediate alloy bars on the tooling platform respectively; Step 4: When welding the end alloy strip and the intermediate alloy strip, a friction stir welding device is used to perform friction stir welding on the butt joint between the splicing portion and the first splicing portion; when welding two intermediate alloy strips, a friction stir welding device is used to perform friction stir welding on the butt joint between the second splicing portion of one intermediate alloy strip and the first splicing portion of the other intermediate alloy strip; Step 5: Loosen the clamping bolts and the clamping block first, then reassemble the remaining alloy bars to be spliced ​​into the corresponding grooves of the tooling platform, and then repeat the above steps 2 to 4 to complete the welding of the remaining alloy bars until all the alloy bars are welded; Step 6: First transfer the welded finished alloy bars to the machine tool, and then machine off the excess parts of each alloy bar joint on the machine tool.

[0007] In the first step, the further detecting the flatness of the butted side surfaces of each alloy strip respectively refers to: detecting the flatness of the first joint portion, the second joint portion, and the side surfaces of the alloy strips that are in contact with each other respectively; In the first step, when the flatness is qualified, it means that when the measured flatness of the first splicing part, the second splicing part, and the side surface where the splicing parts contact each other is ≤0.05mm, the flatness is qualified; In the first step, A is 0.5-1 mm, L1 is 10-15 mm, and L2 is 20-25 mm.

[0008] In the second step, the step of then checking the gap value at the joint between the end alloy strip and the intermediate alloy strip refers to: using a feeler gauge to check the gap value at the joint between the joint portion of the end alloy strip and the first joint portion of the intermediate alloy strip; In the second step, the step of then checking the gap value at the joint of the two master alloy strips refers to: using a feeler gauge to check the gap value at the joint of the first joint portion of one master alloy strip and the second joint portion of the other master alloy strip; In the second step, when the gap value at the butt joint meets the requirement, it means that when the gap value at the butt joint is ≤0.05 mm, it meets the gap value requirement.

[0009] The grooves include connecting grooves and docking grooves, the depth of the connecting grooves is consistent with the thickness of the connecting portion and the end portion, and the width of the connecting grooves is consistent with the width of the connecting portion and the end portion; The depth of the docking groove is equal to the sum of the thickness of the connecting part and A or the sum of the thickness of the end part and A, the length of the docking groove is the sum of two L1, and the width of the docking groove is consistent with the width of the first splicing part, the second splicing part, and the splicing part.

[0010] In the second step, the step of placing the end alloy bar and the intermediate alloy bar in the grooves corresponding to the tooling platform respectively means that when welding the end alloy bar and the intermediate alloy bar, the end of the end alloy bar and the connecting part of the intermediate alloy bar are placed in the connecting groove respectively, and the splicing part and the first splicing part are placed together in the butt joint groove; In the second step, placing the two intermediate alloy bars in the grooves corresponding to the tooling platform respectively means: when welding two intermediate alloy bars, placing the connecting parts of the two intermediate alloy bars in the connecting grooves respectively, and placing the first splicing part of one of the intermediate alloy bars and the second splicing part of the other intermediate alloy bar together in the docking groove.

[0011] The tooling platform and the pressure block are both provided with through bolt holes matched with the clamping bolts. The clamping bolts pass through the bolt holes of the pressure block and the tooling platform in turn to fix the alloy strip. The lower surface of the pressure block and the upper surface of the alloy strip are pressed against each other.

[0012] In the third step, the use of pressing blocks and clamping bolts to fix the end alloy bars and the intermediate alloy bars on the tooling platform respectively means that the end alloy bars and the intermediate alloy bars correspond to four pressing blocks and clamping bolts respectively, and the pressing blocks and clamping bolts are evenly distributed along the length direction of the end alloy bars and the intermediate alloy bars, so as to fix the end alloy bars and the intermediate alloy bars on the tooling platform; In the third step, the use of pressing blocks and clamping bolts to fix the two intermediate alloy bars on the tooling platform respectively means that each intermediate alloy bar corresponds to four pressing blocks and clamping bolts, and the pressing blocks and clamping bolts are evenly distributed along the length direction of each intermediate alloy bar to fix the two intermediate alloy bars on the tooling platform.

[0013] In the fifth step, the method of first loosening the clamping bolts and the pressing block, and then reassembling the remaining alloy bars to be spliced ​​in the grooves corresponding to the tooling platform means: after the welding of two alloy bars is completed, first loosen the clamping bolts and the pressing block, move the welded alloy bars out of the tooling platform from one side, and then re-place the remaining alloy bars to be spliced ​​in the grooves corresponding to the tooling platform from the other side.

[0014] In the sixth step, the step of then machining away the excess parts of each joint of the finished alloy strips on the machine tool means: removing the parts of the first splicing part and the second splicing part that are each thicker by A than the connecting part in the thickness direction, the parts of the first splicing part and the second splicing part that are each wider by L2 than the connecting part in the width direction, the parts of the splicing part that are each thicker by A than the end part in the thickness direction, and the parts of the splicing part that are each wider by L2 than the end part in the width direction.

[0015] The processing refers to using an end mill on a gantry milling machine and using a small cutting speed and a small feed rate to control the cutting process.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. A method for welding a narrow and long alloy strip, wherein the intermediate alloy strip is I-shaped, comprises a first splicing portion, a second splicing portion, and a connecting portion, wherein the first splicing portion, the second splicing portion, and the connecting portion are all rectangular parallelepipeds, and the end alloy strip is T-shaped, comprises a splicing portion and an end portion, wherein the splicing portion and the end portion are rectangular parallelepipeds, and the splicing portion is the same as the first splicing portion and the second splicing portion; when used, an I-shaped intermediate alloy strip and a T-shaped end alloy strip are processed respectively, since the first splicing portion, the second splicing portion, and the splicing portion are all butt joints, and the first splicing portion The thickness and width of the first and second joints are larger than the required alloy strips, so that after the friction stir welding of the alloy strips, the welds formed at the first and second joints and the joints have machining allowances in thickness and width. The increase in the width of the joints avoids the gap between the welding transition plate and the alloy strips, thereby improving the crack-like defects at the weld edge. The increase in the thickness of the joints avoids the crack-like defects at the weld edge, and at the same time, the partially incomplete welded portion of the lower surface of the weld can be reprocessed and removed, so that the quality of the weld meets the quality requirements. Therefore, the present invention can not only perform butt welding on alloy strips, but also improve the crack-like defects at the weld edge.

[0017] 2. In a method for welding narrow and long alloy strips, the end alloy strips and the middle alloy strips are placed in grooves corresponding to the tooling platform, the grooves include connecting grooves and docking grooves, and the end alloy strips and the middle alloy strips are fixed on the tooling platform respectively by using a pressure block and a clamping bolt; when used, the end alloy strips and the middle alloy strips are first placed in the corresponding grooves of the tooling platform as required, and then the alloy strips are fixed on the tooling platform by using a pressure block and a clamping bolt, because the grooves are set according to the first splicing part, the second splicing part, the splicing part, the connecting part, and the end part, the fixing effect of the alloy strips can be improved, thereby avoiding the assembly and welding directly on the welding platform, resulting in insufficient assembly rigidity and stability, thereby improving the quality of the weld. Therefore, the present invention can not only improve the crack-like cracks appearing at the edge of the weld, but also avoid the defects of partial incomplete penetration on the lower surface of the weld.

[0018] 3. In a method for welding narrow and long alloy strips, the processing refers to using an end mill on a gantry milling machine, and using a small cutting speed and a small feed rate to control the cutting process; when applied, the finished alloy strip welded together is transferred to the gantry milling machine, and then the processing parameters of the machine are set according to the size of the excess part, so that the finished alloy strip meets the final size requirements, and the cutting process is controlled by a small cutting speed and a small feed rate, which can avoid introducing new wounds during the cutting process or affecting the flatness of the finished alloy strip, so that the quality of the finished alloy strip meets the requirements. Therefore, the present invention can not only avoid the defect of partial incomplete penetration on the lower surface of the weld, but also improve the quality of the finished alloy strip after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the welding process in the present invention.

[0020] Figure 2 It is an assembly schematic diagram of the present invention.

[0021] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure along the AA direction.

[0022] Figure 4 yes Figure 2 Schematic diagram of the cross-sectional structure along the BB direction.

[0023] Figure 5 It is a front view of alloy welding in the prior art.

[0024] Figure 6 It is a top view of alloy welding in the prior art.

[0025] Figure 7 It is a front view of friction stir welding in the prior art.

[0026] Figure 8 It is a top view of friction stir welding in the prior art.

[0027] Fig. 9 It is a schematic diagram of friction stir welding.

[0028] Fig.10 It is a front view of the end alloy strip in the present invention.

[0029] Fig.11 It is a top view of the end alloy strip in the present invention.

[0030] Fig.12 It is a front view of the intermediate alloy strip in the present invention.

[0031] Fig.13 It is a top view of the intermediate alloy strip in the present invention.

[0032] Fig.14 It is a schematic diagram of the docking groove in the present invention.

[0033] In the figure: alloy strip 1, intermediate alloy strip 11, first splicing part 111, second splicing part 112, connecting part 113, end alloy strip 12, splicing part 121, end part 122, finished alloy strip 13, tooling platform 2, groove 21, connecting groove 211, docking groove 212, pressing block 23, clamping bolt 24, friction stir welding device 3, stirring head 31, stirring needle 32, welding transition plate 33, shaft shoulder 34, weld 4, workpiece to be welded 5, welding pad 6, welding direction 61, base material a, heat affected zone b, thermomechanical affected zone c, weld core zone d. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] See also Figure 1 — Fig.14 A method for welding a narrow and long alloy strip, the method comprising the following steps: The first step: firstly process the alloy strips 1 to be welded, and after the alloy strips 1 are processed, respectively detect the flatness of the butted side surfaces of each alloy strip 1, and when the flatness is qualified, proceed to the next step, and when the flatness is unqualified, grind the butted side surfaces of each alloy strip 1 until the flatness is qualified, and then proceed to the next step; The intermediate alloy strip 11 is located in the middle of the splicing, and the end alloy strips 12 are located at both ends; the intermediate alloy strip 11 is an I-shaped strip, and includes a first splicing portion 111, a second splicing portion 112, and a connecting portion 113. The first splicing portion 111, the second splicing portion 112, and the connecting portion 113 are all rectangular parallelepipeds. In the thickness direction, the upper and lower portions of the first splicing portion 111 are thicker than the connecting portion 113 by A, and in the length direction, the length of the first splicing portion 111 is L1. In the width direction, the front and rear portions of the first splicing portion 111 are thicker than the connecting portion 113 by L2, and the second splicing portion 112 is thicker than the connecting portion 113. The end alloy strip 12 is T-shaped, and the end alloy strip 12 includes a splicing portion 121 and an end portion 122. The splicing portion 121 and the end portion 122 are rectangular parallelepipeds, and the splicing portion 121 is the same as the first splicing portion 111 and the second splicing portion 112; the width of the end portion 122, the connecting portion 113, and the alloy strip 1 is consistent, and the thickness of the end portion 122, the connecting portion 113, and the alloy strip 1 is consistent. The sum of the lengths of the first splicing portion 111, the second splicing portion 112, and the connecting portion 113 is consistent with the length of the alloy strip 1, and the sum of the lengths of the splicing portion 121 and the end portion 122 is consistent with the length of the alloy strip 1; Step 2: When welding the end alloy strip 12 and the middle alloy strip 11, place the end alloy strip 12 and the middle alloy strip 11 in the groove 21 corresponding to the tooling platform 2, and then check the gap value at the joint of the end alloy strip 12 and the middle alloy strip 11. When the gap value at the joint meets the requirements, proceed to the next step. When the gap value at the joint does not meet the requirements, adjust the relative position of the end alloy strip 12 and the middle alloy strip 11 until the gap value meets the requirements, and then proceed to the next step; when welding two middle alloy strips 11, place the two middle alloy strips 11 in the groove 21 corresponding to the tooling platform 2, and then check the gap value at the joint of the two middle alloy strips 11. When the gap value at the joint meets the requirements, proceed to the next step. When the gap value at the joint does not meet the requirements, adjust the relative position of the two middle alloy strips 11 until the gap value meets the requirements, and then proceed to the next step; Step 3: When welding the end alloy strip 12 and the intermediate alloy strip 11, the end alloy strip 12 and the intermediate alloy strip 11 are fixed on the tooling platform 2 by using the pressing block 23 and the clamping bolt 24; when welding two intermediate alloy strips 11, the two intermediate alloy strips 11 are fixed on the tooling platform 2 by using the pressing block 23 and the clamping bolt 24; Step 4: When welding the end alloy strip 12 and the intermediate alloy strip 11, the friction stir welding device 3 is used to perform friction stir welding on the butt joint between the splicing portion 121 and the first splicing portion 111; when welding two intermediate alloy strips 11, the friction stir welding device 3 is used to perform friction stir welding on the butt joint between the second splicing portion 112 of one intermediate alloy strip 11 and the first splicing portion 111 of the other intermediate alloy strip 11; Step 5: first loosen the clamping bolts 24 and the pressing block 23, then reassemble the remaining alloy bars 1 to be spliced ​​into the corresponding grooves 21 of the tooling platform 2, and then repeat the operations of the second to fourth steps to complete the welding of the remaining alloy bars 1 until all the alloy bars 1 are welded; Step 6: first transfer the welded finished alloy strip 13 to the machine tool, and then machine off the redundant parts of the joints of each alloy strip 1 on the finished alloy strip 13 on the machine tool.

[0036] In the first step, the further detecting the flatness of the butted side surfaces of each alloy strip 1 refers to: detecting the flatness of the contacting side surfaces of the first splicing portion 111, the second splicing portion 112, and the splicing portion 121 of the alloy strip 1; In the first step, when the flatness is qualified, it means that when the flatness of the side surfaces of the first splicing portion 111, the second splicing portion 112, and the splicing portion 121 that are in contact with each other is ≤0.05 mm, the flatness is qualified; In the first step, A is 0.5-1 mm, L1 is 10-15 mm, and L2 is 20-25 mm.

[0037] In the second step, the step of then checking the gap value at the joint between the end alloy strip 12 and the intermediate alloy strip 11 means: using a feeler gauge to check the gap value at the joint between the joint portion 121 of the end alloy strip 12 and the first joint portion 111 of the intermediate alloy strip 11; In the second step, the step of then checking the gap value at the joint of the two intermediate alloy strips 11 refers to: using a feeler gauge to check the gap value at the joint of the first joint portion 111 of one intermediate alloy strip 11 and the second joint portion 112 of the other intermediate alloy strip 11; In the second step, when the gap value at the butt joint meets the requirement, it means that when the gap value at the butt joint is ≤0.05 mm, it meets the gap value requirement.

[0038] The groove 21 includes a connecting groove 211 and a docking groove 212. The depth of the connecting groove 211 is consistent with the thickness of the connecting portion 113 and the end portion 122. The width of the connecting groove 211 is consistent with the width of the connecting portion 113 and the end portion 122. The depth of the docking groove 212 is equal to the sum of the thickness of the connecting portion 113 and A or the sum of the thickness of the end portion 122 and A. The length of the docking groove 212 is the sum of two L1s. The width of the docking groove 212 is consistent with the widths of the first splicing portion 111, the second splicing portion 112, and the splicing portion 121.

[0039] In the second step, the end alloy strip 12 and the intermediate alloy strip 11 are placed in the grooves 21 corresponding to the tooling platform 2 respectively, which means that when welding the end alloy strip 12 and the intermediate alloy strip 11, the end 122 of the end alloy strip 12 and the connecting portion 113 of the intermediate alloy strip 11 are placed in the connecting groove 211 respectively, and the splicing portion 121 and the first splicing portion 111 are placed together in the butt joint groove 212; In the second step, placing the two intermediate alloy bars 11 in the grooves 21 corresponding to the tooling platform 2 respectively means: when welding the two intermediate alloy bars 11, the connecting parts 113 of the two intermediate alloy bars 11 are placed in the connecting grooves 211 respectively, and the first splicing part 111 of one of the intermediate alloy bars 11 and the second splicing part 112 of the other intermediate alloy bar 11 are placed together in the docking groove 212.

[0040] The tooling platform 2 and the pressing block 23 are both provided with through bolt holes adapted to the clamping bolts 24. The clamping bolts 24 pass through the bolt holes of the pressing block 23 and the tooling platform 2 in sequence to fix the alloy strip 1. The lower surface of the pressing block 23 and the upper surface of the alloy strip 1 are pressed against each other.

[0041] In the third step, the use of the pressing blocks 23 and the clamping bolts 24 to fix the end alloy strips 12 and the intermediate alloy strips 11 on the tooling platform 2 respectively means that the end alloy strips 12 and the intermediate alloy strips 11 correspond to four pressing blocks 23 and the clamping bolts 24 respectively, and the pressing blocks 23 and the clamping bolts 24 are evenly distributed along the length direction of the end alloy strips 12 and the intermediate alloy strips 11, so as to fix the end alloy strips 12 and the intermediate alloy strips 11 on the tooling platform 2; In the third step, the use of the pressing blocks 23 and the clamping bolts 24 to fix the two intermediate alloy strips 11 on the tooling platform 2 respectively means that each intermediate alloy strip 11 corresponds to four pressing blocks 23 and clamping bolts 24, and the pressing blocks 23 and clamping bolts 24 are evenly distributed along the length direction of each intermediate alloy strip 11, so as to fix the two intermediate alloy strips 11 on the tooling platform 2.

[0042] In the fifth step, the clamping bolts 24 and the pressing block 23 are loosened first, and then the remaining alloy strips 1 to be spliced ​​are reassembled in the grooves 21 corresponding to the tooling platform 2. This means that after the welding of two alloy strips 1 is completed, the clamping bolts 24 and the pressing block 23 are loosened first, the welded alloy strips 1 are moved out of the tooling platform 2 from one side, and then the remaining alloy strips 1 to be spliced ​​are re-placed in the grooves 21 corresponding to the tooling platform 2 from the other side.

[0043] In the sixth step, the redundant parts of each alloy strip 1 at the joint of the finished alloy strip 13 are then processed on the machine tool, which means: the parts of the first splicing part 111 and the second splicing part 112 that are thicker by A than the connecting part 113 in the thickness direction, the parts of the first splicing part 111 and the second splicing part 112 that are wider by L2 than the connecting part 113 in the width direction, the parts of the splicing part 121 that are thicker by A than the end part 122 in the thickness direction, and the parts of the splicing part 121 that are wider by L2 than the end part 122 in the width direction are removed.

[0044] The processing refers to using an end mill on a gantry milling machine and using a small cutting speed and a small feed rate to control the cutting process.

[0045] The supplementary description of the present invention is as follows: The preferred alloy strip 1 of the present invention is a copper alloy strip, an aluminum alloy strip, or a magnesium alloy strip, and is particularly suitable for copper alloys.

[0046] In the present invention, the size of each alloy strip 1 is preferably 800-1500 mm in length, 10-200 mm in width, and 2-5 mm in thickness.

[0047] The dimensions of the narrow and long finished alloy strip 13 preferably manufactured in the present invention are 9600-18000 mm in length, 10-200 mm in width, and 2-5 mm in thickness.

[0048] The present invention preferably performs 100% color flaw detection and 100% radiographic flaw detection on the weld 4 at the joint, and the flaw detection results meet the Grade I requirements of the NB / T47013-2015 standard, indicating that the quality of the weld 4 is qualified.

[0049] The preferred working principle of the friction stir welding of the present invention is as follows: during the friction stir welding process, the stirring head 31 drives the stirring needle 32 to rotate and slowly insert into the workpiece 5 to be welded. The friction shear resistance between the stirring head 31 and the material to be welded generates friction heat, which plasticizes the parent material a in the adjacent area being stirred. The stirring head 31 rotates and moves forward along the joint of the workpiece 5 to be welded. The hot plasticized metal material flows to the rear of the stirring head under the welding pressure and the wrapping action of the shoulder 34, forming a dense solid-phase connection joint.

[0050] The reason why the present invention preferably increases A in the thickness direction is that the material is plasticized during the welding process, and the thickness dimension of the part will decrease under the action of pressure.

[0051] In the present invention, the dimension A increased in the thickness direction is preferably 0.5-1 mm, the dimension L1 increased in the width direction is 10-15 mm, and the dimension L2 increased in the length direction is 20-25 mm.

[0052] The reason why the present invention prefers that L1 is 10-15 mm and L2 is 20-25 mm is that it is determined according to the structure of the friction stir welding equipment.

[0053] In the preferred sixth step of the present invention, in the process of machining off the excess portion of the joint of each alloy bar 1 on the finished alloy bar 13 on the machine tool, the process parameters of the machine tool are set to the machining thickness A and the machining single side length L2.

[0054] The reason why the present invention preferably adopts a small cutting speed and a small feed rate to control the removal process in the sixth step is to avoid introducing new wounds or affecting the flatness of the finished alloy strip 13 during the process of machining the excess part, and to ensure that the spliced ​​weld 4 is 100% color flaw detection and 100% radiographic flaw detection after machining, and the flaw detection results meet the Grade I requirements of the NB / T47013-2015 standard.

[0055] Embodiment 1: See also Figure 1 — Fig.14 A method for welding a narrow and long alloy strip, the method comprising the following steps: The first step: firstly process the alloy strips 1 to be welded, and after the alloy strips 1 are processed, respectively detect the flatness of the butted side surfaces of each alloy strip 1, and when the flatness is qualified, proceed to the next step, and when the flatness is unqualified, grind the butted side surfaces of each alloy strip 1 until the flatness is qualified, and then proceed to the next step; The intermediate alloy strip 11 is located in the middle of the splicing, and the end alloy strips 12 are located at both ends; the intermediate alloy strip 11 is an I-shaped strip, and includes a first splicing portion 111, a second splicing portion 112, and a connecting portion 113. The first splicing portion 111, the second splicing portion 112, and the connecting portion 113 are all rectangular parallelepipeds. In the thickness direction, the upper and lower portions of the first splicing portion 111 are thicker than the connecting portion 113 by A, and in the length direction, the length of the first splicing portion 111 is L1. In the width direction, the front and rear portions of the first splicing portion 111 are thicker than the connecting portion 113 by L2, and the second splicing portion 112 is thicker than the connecting portion 113. The end alloy strip 12 is T-shaped, and the end alloy strip 12 includes a splicing portion 121 and an end portion 122. The splicing portion 121 and the end portion 122 are rectangular parallelepipeds, and the splicing portion 121 is the same as the first splicing portion 111 and the second splicing portion 112; the width of the end portion 122, the connecting portion 113, and the alloy strip 1 is consistent, and the thickness of the end portion 122, the connecting portion 113, and the alloy strip 1 is consistent. The sum of the lengths of the first splicing portion 111, the second splicing portion 112, and the connecting portion 113 is consistent with the length of the alloy strip 1, and the sum of the lengths of the splicing portion 121 and the end portion 122 is consistent with the length of the alloy strip 1; Step 2: When welding the end alloy strip 12 and the middle alloy strip 11, place the end alloy strip 12 and the middle alloy strip 11 in the groove 21 corresponding to the tooling platform 2, and then check the gap value at the joint of the end alloy strip 12 and the middle alloy strip 11. When the gap value at the joint meets the requirements, proceed to the next step. When the gap value at the joint does not meet the requirements, adjust the relative position of the end alloy strip 12 and the middle alloy strip 11 until the gap value meets the requirements, and then proceed to the next step; when welding two middle alloy strips 11, place the two middle alloy strips 11 in the groove 21 corresponding to the tooling platform 2, and then check the gap value at the joint of the two middle alloy strips 11. When the gap value at the joint meets the requirements, proceed to the next step. When the gap value at the joint does not meet the requirements, adjust the relative position of the two middle alloy strips 11 until the gap value meets the requirements, and then proceed to the next step; Step 3: When welding the end alloy strip 12 and the intermediate alloy strip 11, the end alloy strip 12 and the intermediate alloy strip 11 are fixed on the tooling platform 2 by using the pressing block 23 and the clamping bolt 24; when welding two intermediate alloy strips 11, the two intermediate alloy strips 11 are fixed on the tooling platform 2 by using the pressing block 23 and the clamping bolt 24; Step 4: When welding the end alloy strip 12 and the intermediate alloy strip 11, the friction stir welding device 3 is used to perform friction stir welding on the butt joint between the splicing portion 121 and the first splicing portion 111; when welding two intermediate alloy strips 11, the friction stir welding device 3 is used to perform friction stir welding on the butt joint between the second splicing portion 112 of one intermediate alloy strip 11 and the first splicing portion 111 of the other intermediate alloy strip 11; Step 5: first loosen the clamping bolts 24 and the pressing block 23, then reassemble the remaining alloy bars 1 to be spliced ​​into the corresponding grooves 21 of the tooling platform 2, and then repeat the operations of the second to fourth steps to complete the welding of the remaining alloy bars 1 until all the alloy bars 1 are welded; Step 6: first transfer the welded finished alloy strip 13 to the machine tool, and then machine off the redundant parts of the joints of each alloy strip 1 on the finished alloy strip 13 on the machine tool.

[0056] Embodiment 2: The basic content is the same as Example 1, except that: in the first step, the further detecting of the flatness of the butting side surfaces of each alloy strip 1 refers to detecting the flatness of the contacting side surfaces of the first splicing portion 111, the second splicing portion 112, and the splicing portion 121 of the alloy strip 1; in the first step, when the flatness is qualified, it means that when the measured flatness of the contacting side surfaces of the first splicing portion 111, the second splicing portion 112, and the splicing portion 121 is ≤0.05mm, the flatness is qualified; in the first step, A is 0.5-1mm, L1 is 10-15mm, and L2 is 20-25mm.

[0057] When applying, firstly, respectively check the flatness of the contacting sides of the first splicing part 111, the second splicing part 112, and the splicing part 121. When the flatness is ≤0.05mm, the flatness is qualified and proceed to the next step. If the flatness is unqualified, grind the contacting sides of the first splicing part 111, the second splicing part 112, and the splicing part 121 until the flatness is qualified. Ensuring the flatness of the side of the joint is qualified can improve the firmness, sealing and appearance quality of the weld 4 joint, thereby improving the quality of the weld 4.

[0058] Embodiment 3: The basic content is the same as that of Example 1, except that: in the second step, the step of then checking the gap value at the joint between the end alloy strip 12 and the intermediate alloy strip 11 refers to: using a feeler gauge to check the gap value at the joint between the splicing portion 121 of the end alloy strip 12 and the first splicing portion 111 of the intermediate alloy strip 11; in the second step, the step of then checking the gap value at the joint between the two intermediate alloy strips 11 refers to: using a feeler gauge to check the gap value at the joint between the first splicing portion 111 of one intermediate alloy strip 11 and the second splicing portion 112 of the other intermediate alloy strip 11; in the second step, the step of when the gap value at the joint meets the requirement refers to: when the gap value at the joint is ≤0.05mm, it meets the gap value requirement.

[0059] When applying, first check the gap value at the joint of the two alloy strips 1. When the gap value is ≤0.05mm, it meets the gap value requirement and proceed to the next step. If the gap value is unqualified, continue to adjust the relative position of the two alloy strips 1 until the gap value is qualified; because the size of the gap at the joint will directly affect the formation of the weld, too large a gap value will lead to uneven weld formation, increase welding defects, and thus affect the quality of the weld 4.

[0060] Embodiment 4: The basic content is the same as that of Example 1, except that: the groove 21 includes a connecting groove 211 and a docking groove 212, the depth of the connecting groove 211 is consistent with the thickness of the connecting portion 113 and the end portion 122, and the width of the connecting groove 211 is consistent with the width of the connecting portion 113 and the end portion 122; the depth of the docking groove 212 is equal to the sum of the thickness of the connecting portion 113 and A or the sum of the thickness of the end portion 122 and A, the length of the docking groove 212 is the sum of two L1, and the width of the docking groove 212 is consistent with the width of the first splicing portion 111, the second splicing portion 112, and the splicing portion 121; in the second step, The said placing the end alloy strip 12 and the intermediate alloy strip 11 in the groove 21 corresponding to the tooling platform 2 respectively means: when welding the end alloy strip 12 and the intermediate alloy strip 11, the end 122 of the end alloy strip 12 and the connecting portion 113 of the intermediate alloy strip 11 are respectively placed in the connecting groove 211, and the splicing portion 121 and the first splicing portion 111 are placed together in the docking groove 212; in the second step, the said placing the two intermediate alloy strips 11 in the groove 21 corresponding to the tooling platform 2 respectively means: when welding the two intermediate alloy strips 11, the connecting portions 113 of the two intermediate alloy strips 11 are respectively placed in the connecting groove 211, and the two intermediate alloy strips 11 are respectively placed in the connecting groove 211. The first splicing portion 111 of one intermediate alloy strip 11 and the second splicing portion 112 of another intermediate alloy strip 11 are placed together in the docking groove 212; the tooling platform 2 and the pressing block 23 are both provided with through bolt holes adapted to the clamping bolts 24, and the clamping bolts 24 are passed through the bolt holes of the pressing block 23 and the tooling platform 2 in sequence to fix the alloy strip 1, and the lower surface of the pressing block 23 and the upper surface of the alloy strip 1 are pressed against each other; in the third step, the use of the pressing block 23 and the clamping bolts 24 to fix the end alloy strip 12 and the intermediate alloy strip 11 on the tooling platform 2 respectively means: the end alloy strip 12, the intermediate alloy strip 11 The gold bar 11 corresponds to four pressing blocks 23 and clamping bolts 24 respectively, and the pressing blocks 23 and clamping bolts 24 are evenly distributed along the length direction of the end alloy bar 12 and the middle alloy bar 11, and the end alloy bar 12 and the middle alloy bar 11 are fixed on the tooling platform 2; in the third step, the use of pressing blocks 23 and clamping bolts 24 to fix the above two middle alloy bars 11 on the tooling platform 2 respectively means that each middle alloy bar 11 corresponds to four pressing blocks 23 and clamping bolts 24 respectively, and the pressing blocks 23 and clamping bolts 24 are evenly distributed along the length direction of each middle alloy bar 11, and the two middle alloy bars 11 are fixed on the tooling platform 2.

[0061] In application, when welding the end alloy strip 12 and the middle alloy strip 11, the end 122 of the end alloy strip 12 and the connecting portion 113 of the middle alloy strip 11 are placed in the connecting groove 211 respectively, and the splicing portion 121 and the first splicing portion 111 are placed in the docking groove 212 together, and then the gap value at the docking of the splicing portion 121 and the first splicing portion 111 is measured. If the gap value is qualified, the clamping bolt 24 is passed through the corresponding bolt holes of the pressing block 23 and the tooling platform 2, and then the end alloy strip 12 and the middle alloy strip 11 are fixed on the tooling platform 2; when welding two middle alloy strips 11, the connecting portions 113 of the two middle alloy strips 11 are placed in the connecting groove 211 respectively, and one of the middle alloy strips 11 is placed in the connecting groove 212. The first joint portion 111 of the gold bar 11 and the second joint portion 112 of the other intermediate alloy bar 11 are placed together in the docking groove 212, and then the gap value at the docking point between the first joint portion 111 of one intermediate alloy bar 11 and the second joint portion 112 of the other intermediate alloy bar 11 is measured. If the gap value is qualified, the clamping bolts 24 are passed through the corresponding bolt holes of the pressing block 23 and the tooling platform 2 to fix the two intermediate alloy bars 11 on the tooling platform 2; because the connecting grooves 211 and the docking grooves 212 on the tooling platform 2 are consistent with the outer dimensions of the alloy bar 1, the alloy bar 1 can be prevented from moving in the tooling platform 2 during welding, thereby ensuring the assembly rigidity and stability, thereby improving the quality of the weld 4.

[0062] Embodiment 5: The basic content is the same as Example 1, except that: in the fifth step, the first loosening of the clamping bolts 24 and the pressing block 23, and then reassembling the remaining alloy strips 1 to be spliced ​​in the groove 21 corresponding to the tooling platform 2 means: after the welding of two alloy strips 1 is completed, first loosen the clamping bolts 24 and the pressing block 23, move the welded alloy strips 1 out of the tooling platform 2 from one side, and then re-place the remaining alloy strips 1 to be spliced ​​in the groove 21 corresponding to the tooling platform 2 from the other side.

[0063] During use, after the two alloy strips 1 are welded, first loosen the clamping bolts 24 and the pressing blocks 23, then move the welded alloy strips 1 out of the tooling platform 2 from one side, and then re-place the remaining alloy strips 1 to be spliced ​​into the corresponding grooves 21 of the tooling platform 2 from the other side, and dock and weld the first splicing portion 111 of the newly installed alloy strip 1 with the second splicing portion 112 of the middle alloy strip 11 on one side.

[0064] Embodiment 6: The basic content is the same as that of Example 1, except that: in the sixth step, the processing of the excess parts of each alloy strip 1 at the joint of the finished alloy strip 13 on the machine tool means: removing the parts of the first splicing part 111 and the second splicing part 112 whose thickness direction is increased by A compared with the thickness of the connecting part 113, the parts of the first splicing part 111 and the second splicing part 112 whose width direction is increased by L2 compared with the width of the connecting part 113, the parts of the splicing part 121 whose thickness direction is increased by A compared with the thickness of the end part 122, and the parts of the splicing part 121 whose width direction is increased by L2 compared with the width of the end part 122; the processing means using an end mill on a gantry milling machine, and controlling the removal process by using a small cutting speed and a small feed rate.

[0065] When in use, the finished alloy strip 13 welded together is transferred to a gantry milling machine, and an end mill is used to cut off the excess part at the joint. During the cutting process, the processing parameters of the machine are set according to the size of the excess part, and a small cutting speed and a small feed rate are used for control, so that the finished alloy strip 13 meets the final size requirements, while avoiding the introduction of new wounds during the cutting process or affecting the flatness of the finished alloy strip 13, so that the quality of the finished alloy strip 13 meets the requirements.

[0066] Embodiment 7: The basic content is the same as that of Example 1, except that: the size of the alloy bar 1 is 3×14×1000 mm, and twelve alloy bars 1 are welded by friction stir welding to obtain a finished alloy bar 13 with a size of 3×14×12000 mm; two T-shaped end alloy bars 12 and ten I-shaped intermediate alloy bars 11 are first processed; When processing the end alloy strip 12, the thickness of the end 122 of the end alloy strip 12 is 3mm, the thickness of the splicing portion 121 of the end alloy strip 12 is 4mm, and the upper and lower margins are 0.5mm (i.e. A=0.5mm), the width of the end 122 is 14mm, and the width of the splicing portion 121 is L2 more than the width of the end 122 on one side, i.e. the width of the splicing portion 121 is 14+2*L2, the length of the splicing portion 121 is L1, and the length of the end 122 is 1000-L1; when processing the intermediate alloy strip 1 1, the first splicing part 111, the second splicing part 112 and the splicing part 121 in the intermediate alloy strip 11 are the same, the thickness of the connecting part 113 is 3mm, the width is 14mm, and the length is 1000-2*L1; then the flatness of the corresponding side surfaces of the splicing part 121, the first splicing part 111, and the second splicing part 112 are respectively detected. When the flatness is ≤0.05mm, the flatness is qualified and the next step is continued. When the flatness is unqualified, the butt-jointed side surfaces of each alloy strip 1 are polished until the flatness is qualified and the next step is continued.

[0067] Embodiment 8: The basic content is the same as Example 7, except that: the depth of the connecting groove 211 is consistent with the thickness of the connecting part 113 and the end part 122, which is 3 mm, and the width of the connecting groove 211 is consistent with the width of the connecting part 113 and the end part 122, which is 14 mm; the depth of the docking groove 212 is equal to the sum of the thickness of the connecting part 113 and A or the sum of the thickness of the end part 122 and A, which is 3.5 mm, the length of the docking groove 212 is the sum of two L1, which is 2*L1, and the width of the docking groove 212 is consistent with the width of the first splicing part 111, the second splicing part 112, and the splicing part 121, which is 14+2*L2, where L1 is 10-15 mm and L2 is 20-25 mm.

[0068] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A method for welding narrow and long alloy strips, characterized in that: The method for welding a narrow and long alloy strip comprises the following steps: The first step is to first process the alloy strips (1) to be welded. After the alloy strips (1) are processed, the flatness of the butted side surfaces of each alloy strip (1) is respectively detected. When the flatness is acceptable, the next step is performed. When the flatness is unacceptable, the butted side surfaces of each alloy strip (1) are polished until the flatness is acceptable, and the next step is performed. The intermediate alloy strip (11) is located in the middle of the splicing, and the end alloy strips (12) are located at both ends; the intermediate alloy strip (11) is in an I-shape, and comprises a first splicing portion (111), a second splicing portion (112), and a connecting portion (113); the first splicing portion (111), the second splicing portion (112), and the connecting portion (113) are all rectangular parallelepipeds; in the thickness direction, the upper and lower portions of the first splicing portion (111) are thicker than the connecting portion (113) by A, in the length direction, the length of the first splicing portion (111) is L1, and in the width direction, the front and rear portions of the first splicing portion (111) are thicker than the connecting portion (113) by L2, and the second splicing portion (112) and the first splicing portion (113) are connected by a plurality of holes. 111); the end alloy strip (12) is T-shaped, the end alloy strip (12) comprises a splicing portion (121) and an end portion (122), the splicing portion (121) and the end portion (122) are rectangular parallelepiped, the splicing portion (121) is the same as the first splicing portion (111) and the second splicing portion (112); the end portion (122), the connecting portion (113) and the alloy strip (1) have the same width, the end portion (122), the connecting portion (113) and the alloy strip (1) have the same thickness, the sum of the lengths of the first splicing portion (111), the second splicing portion (112) and the connecting portion (113) is the same as the length of the alloy strip (1), and the sum of the lengths of the splicing portion (121) and the end portion (122) is the same as the length of the alloy strip (1); Step 2: When welding the end alloy strip (12) and the intermediate alloy strip (11), the end alloy strip (12) and the intermediate alloy strip (11) are respectively placed in the groove (21) corresponding to the tooling platform (2), and then the gap value at the joint between the end alloy strip (12) and the intermediate alloy strip (11) is checked. When the gap value at the joint meets the requirement, the next step is continued. When the gap value at the joint does not meet the requirement, the relative position of the end alloy strip (12) and the intermediate alloy strip (11) is adjusted until the gap value meets the requirement, and then the next step is carried out; when welding two intermediate alloy strips (11), the two intermediate alloy strips (11) are respectively placed in the groove (21) corresponding to the tooling platform (2), and then the gap value at the joint between the two intermediate alloy strips (11) is checked. When the gap value at the joint meets the requirement, the next step is continued. When the gap value at the joint does not meet the requirement, the relative position of the two intermediate alloy strips (11) is adjusted until the gap value meets the requirement, and then the next step is carried out; Step 3: when welding the end alloy strip (12) and the intermediate alloy strip (11), the end alloy strip (12) and the intermediate alloy strip (11) are respectively fixed on the tooling platform (2) by using a pressing block (23) and a clamping bolt (24); when welding two intermediate alloy strips (11), the two intermediate alloy strips (11) are respectively fixed on the tooling platform (2) by using a pressing block (23) and a clamping bolt (24); Step 4: when welding the end alloy strip (12) and the intermediate alloy strip (11), the friction stir welding device (3) is used to perform friction stir welding on the butt joint between the joint portion (121) and the first joint portion (111); when welding two intermediate alloy strips (11), the friction stir welding device (3) is used to perform friction stir welding on the butt joint between the second joint portion (112) of one intermediate alloy strip (11) and the first joint portion (111) of the other intermediate alloy strip (11); Step 5: first loosen the clamping bolt (24) and the clamping block (23), then reassemble the remaining alloy strips (1) to be spliced ​​into the corresponding grooves (21) of the tooling platform (2), and then repeat the operations of steps 2 to 4 to complete the welding of the remaining alloy strips (1), until all the alloy strips (1) are welded; Step 6: First, the welded finished alloy strip (13) is transferred to a machine tool, and then the excess portion of each alloy strip (1) at the joint of the finished alloy strip (13) is machined off on the machine tool.

2. A method for welding narrow and long alloy strips according to claim 1, characterized in that: In the first step, the further detecting the flatness of the butted side surfaces of each alloy strip (1) refers to: detecting the flatness of the contacting side surfaces of the first splicing portion (111), the second splicing portion (112), and the splicing portion (121) of the alloy strip (1); In the first step, when the flatness is qualified, it means that when the flatness of the side surfaces of the first splicing portion (111), the second splicing portion (112), and the splicing portion (121) in contact with each other is ≤0.05 mm, the flatness is qualified; In the first step, A is 0.5-1 mm, L1 is 10-15 mm, and L2 is 20-25 mm.

3. A method for welding narrow and long alloy strips according to claim 1, characterized in that: In the second step, the step of then checking the gap value at the joint between the end alloy strip (12) and the intermediate alloy strip (11) refers to: using a feeler gauge to check the gap value at the joint between the joint portion (121) of the end alloy strip (12) and the first joint portion (111) of the intermediate alloy strip (11); In the second step, the step of then checking the gap value at the joint of the two intermediate alloy strips (11) refers to: using a feeler gauge to check the gap value at the joint between the first joint portion (111) of one intermediate alloy strip (11) and the second joint portion (112) of the other intermediate alloy strip (11); In the second step, when the gap value at the butt joint meets the requirement, it means that when the gap value at the butt joint is ≤0.05 mm, it meets the gap value requirement.

4. A method for welding narrow and long alloy strips according to claim 1, 2 or 3, characterized in that: The groove (21) comprises a connecting groove (211) and a docking groove (212); the depth of the connecting groove (211) is consistent with the thickness of the connecting portion (113) and the end portion (122); and the width of the connecting groove (211) is consistent with the width of the connecting portion (113) and the end portion (122); The depth of the docking groove (212) is equal to the sum of the thickness of the connecting portion (113) and A or the sum of the thickness of the end portion (122) and A, the length of the docking groove (212) is the sum of two L1s, and the width of the docking groove (212) is consistent with the widths of the first splicing portion (111), the second splicing portion (112), and the splicing portion (121).

5. A method for welding narrow and long alloy strips according to claim 4, characterized in that: In the second step, the step of placing the end alloy strip (12) and the intermediate alloy strip (11) in the grooves (21) corresponding to the tooling platform (2) respectively means that when welding the end alloy strip (12) and the intermediate alloy strip (11), the end portion (122) of the end alloy strip (12) and the connecting portion (113) of the intermediate alloy strip (11) are placed in the connecting groove (211) respectively, and the splicing portion (121) and the first splicing portion (111) are placed together in the butt-joining groove (212); In the second step, the step of placing the two intermediate alloy bars (11) in the grooves (21) corresponding to the tooling platform (2) respectively means that when welding the two intermediate alloy bars (11), the connecting portions (113) of the two intermediate alloy bars (11) are placed in the connecting grooves (211) respectively, and the first splicing portion (111) of one of the intermediate alloy bars (11) and the second splicing portion (112) of the other intermediate alloy bar (11) are placed together in the butt joint groove (212).

6. A method for welding narrow and long alloy strips according to claim 1, 2 or 3, characterized in that: The tooling platform (2) and the pressing block (23) are both provided with through bolt holes that are compatible with the clamping bolts (24); the clamping bolts (24) are passed through the bolt holes of the pressing block (23) and the tooling platform (2) in sequence to fix the alloy strip (1); the lower surface of the pressing block (23) and the upper surface of the alloy strip (1) are pressed against each other.

7. A method for welding narrow and long alloy strips according to claim 6, characterized in that: In the third step, the use of the pressing blocks (23) and the clamping bolts (24) to fix the end alloy strip (12) and the intermediate alloy strip (11) on the tooling platform (2) respectively means that the end alloy strip (12) and the intermediate alloy strip (11) correspond to four pressing blocks (23) and clamping bolts (24) respectively, and the pressing blocks (23) and the clamping bolts (24) are evenly distributed along the length direction of the end alloy strip (12) and the intermediate alloy strip (11), so as to fix the end alloy strip (12) and the intermediate alloy strip (11) on the tooling platform (2); In the third step, the use of pressure blocks (23) and clamping bolts (24) to fix the two intermediate alloy strips (11) on the tooling platform (2) respectively means that each intermediate alloy strip (11) corresponds to four pressure blocks (23) and clamping bolts (24), and the pressure blocks (23) and clamping bolts (24) are evenly distributed along the length direction of each intermediate alloy strip (11), so as to fix the two intermediate alloy strips (11) on the tooling platform (2).

8. A method for welding narrow and long alloy strips according to claim 1, 2 or 3, characterized in that: In the fifth step, the method of first loosening the clamping bolt (24) and the pressing block (23) and then reassembling the remaining alloy strip (1) to be spliced ​​into the corresponding groove (21) of the tooling platform (2) means that after the welding of the two alloy strips (1) is completed, the clamping bolt (24) and the pressing block (23) are first loosened, the welded alloy strip (1) is moved out of the tooling platform (2) from one side, and then the remaining alloy strip (1) to be spliced ​​is re-placed into the corresponding groove (21) of the tooling platform (2) from the other side.

9. A method for welding narrow and long alloy strips according to claim 1, 2 or 3, characterized in that: In the sixth step, the step of then machining away the excess parts of the joints of each alloy strip (1) on the finished alloy strip (13) on a machine tool means: removing the parts of the first splicing part (111) and the second splicing part (112) whose thickness direction is increased by A compared with the thickness of the connecting part (113), the parts of the first splicing part (111) and the second splicing part (112) whose width direction is increased by L2 compared with the width of the connecting part (113), the parts of the splicing part (121) whose thickness direction is increased by A compared with the thickness of the end part (122), and the parts of the splicing part (121) whose width direction is increased by L2 compared with the width of the end part (122).

10. A method for welding narrow and long alloy strips according to claim 9, characterized in that: The processing refers to using an end mill on a gantry milling machine and using a small cutting speed and a small feed rate to control the cutting process.

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