Welding process of titanium pipe

Abstract

The invention discloses a titanium pipe welding process, and belongs to the technical field of titanium pipe welding. A titanium pipe welding technology comprises the following steps that the welding portion of a titanium pipe is cleaned and treated, and it is guaranteed that the surface is smooth and free of oil stains and oxides; the two titanium pipes to be welded are fixed to the clamping assembly, and the distance between the two titanium pipes is kept to range from 1.5 mm to 2.0 mm; before welding, the titanium pipe is preheated, and then the welding assembly is used for welding the titanium pipe; after welding is completed, dust wiping and cleaning are conducted on the surface of a welding seam, and the quality of the welding seam is detected. A jacking mechanism is arranged to push the two moving blocks to move relatively, protruding blocks A are arranged on the two sides of the moving blocks, limiting blocks are movably connected to the protruding blocks A, and corresponding adjustment can be conducted when titanium pipes of different sizes are clamped through the movably-connected limiting blocks; and the arc surfaces of the bottom surfaces of the limiting blocks are arranged to be more attached to the outer wall of the titanium tube, and anti-skid protrusions are arranged on the arc surfaces to prevent the tube from shifting or rotating.

Description

Technical Field

[0001] The invention relates to the technical field of titanium pipe welding, and more specifically to a titanium pipe welding process. Background Art

[0002] Titanium has a light specific gravity, high specific strength, and excellent corrosion resistance. It is widely used in many fields such as chemical industry, military industry, marine engineering, power stations, etc. Pure titanium pipes are an important classification of titanium materials. There are currently two manufacturing methods for pipes below Φ120: (a) seamless pipes, which are processed by extrusion, extrusion perforation followed by rolling, and oblique rolling perforation followed by rolling. (b) titanium welded pipes, which are welded after rolling titanium strips. Usually used in heat exchangers in power stations, with specifications ranging from Φ16-40. Pipes with specifications above Φ120 are generally made by rolling and welding plates.

[0003] The welding device is a fixture with welding fixing, clamping and positioning functions, which is mainly used for welding various weldable materials and welding of large, medium and small components. The welding device is widely used in steel structures, bicycle and motorcycle manufacturing, engineering machinery, frames, boxes, pressure vessels, robot welding, sheet metal processing, metal furniture, equipment assembly and industrial pipelines (flanges) and other welding and detection systems; there are many sources of energy for modern welding, including gas flame, arc, laser, electron beam, friction and ultrasonic, etc. When welding titanium pipes, the efficiency of manual welding and clamping pipes is low. In view of this, we propose a welding process and welding process for titanium pipes. Summary of the invention

[0004] The purpose of the present invention is to provide a titanium pipe welding process to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A titanium tube welding process comprises the following steps:

[0007] Clean and treat the welding parts of the titanium tube to ensure that the surface is smooth, free of oil and oxide;

[0008] Fix the two titanium tubes to be welded on the clamping assembly so that the distance between the two titanium tubes is maintained at 1.5-2.0 mm;

[0009] Before welding, the titanium tube is preheated, and then the titanium tube is welded using a welding assembly;

[0010] The welded titanium tube is placed in a vacuum annealing furnace for annealing at a temperature of 550°C and an annealing holding time of 65 minutes to obtain a welded titanium tube;

[0011] Finally, the weld surface is cleaned by dusting and the weld quality is tested. A workbench is provided on one side of the welding assembly, a clamping assembly is provided on the top of the workbench, the clamping assembly includes two sets of oppositely arranged clamping mechanisms, a moving block is connected to the inner side of the clamping mechanism, and protrusions A are provided on both sides of the moving block, and a limit block is movably connected to the protrusion A, and the bottom surface of the limit block is set as an arc surface, and an anti-slip protrusion is provided on the arc surface.

[0012] Preferably, the tightening mechanism includes a fixed rod, a support is provided on one side of the fixed rod, the fixed rod passes through the support, and the fixed rod and the support are slidably matched, a pushing member is provided on the outside of the support, and the pushing member is rotatably connected to the fixed rod.

[0013] Preferably, the pushing member comprises a first connecting rod and a second connecting rod, one end of the second connecting rod is rotatably connected to the first connecting rod, and the other end of the second connecting rod is rotatably connected to the fixed rod;

[0014] One end of the outer side of the support extends to the end of the first connecting rod and is rotatably connected to the first connecting rod. A cylinder is arranged above the other end of the first connecting rod. A bracket is arranged on the top surface of the workbench. The cylinder is arranged tilted and installed on the bracket.

[0015] Preferably, a sliding groove is provided on the protrusion A, and a sliding block A is provided on the limiting block. The sliding block A is slidably matched with the sliding groove. A threaded rod is rotatably connected to the sliding block A, and the threaded rod is threadedly connected to the protrusion A.

[0016] Preferably, a slider B is provided at the bottom of the moving block, a slide rail is provided on the top surface of the workbench, and the slider B is slidably matched with the slide rail.

[0017] Preferably, a spring is sleeved on the inner end of the fixed rod, a stop ring A and a stop ring B are respectively arranged on both sides of the spring, and the inner end of the fixed rod is connected to the moving block.

[0018] Preferably, the gear ring A is fixedly connected to the fixed rod, and the gear ring B is slidably matched with the fixed rod; a groove is opened in the middle of the moving block, and two protrusions B are arranged opposite to each other in the groove, and the fixed rod passes between the two protrusions B.

[0019] Preferably, the welding assembly comprises a mechanical arm arranged at one side of the workbench, and a welding gun is arranged on the mechanical arm.

[0020] Preferably, a support plate is provided on the top surface of the workbench between the two moving blocks, and a limiting groove is provided on the top surface of the support plate.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention promotes the relative movement of two moving blocks by setting a tightening mechanism, and protrusions A are set on both sides of the moving blocks. The protrusions A are movably connected with limit blocks. When clamping titanium tubes of different sizes, the limit blocks can be adjusted accordingly, and the application range is wider. The bottom arc surface of the limit block is more closely fitted to the outer wall of the titanium tube, and the arc surface is provided with anti-slip protrusions to prevent the tube from shifting or rotating.

[0023] (2) The present invention uses a spring to apply a certain thrust to the moving block to prevent the moving block from clamping too tightly and damaging the titanium tube; when the moving block clamps the titanium tube, the moving block is subjected to a reverse thrust, which pushes the retaining ring B to squeeze the spring, thereby preventing the titanium tube from being clamped too strongly; and a preheating component can be provided in the limit block to preheat the titanium tube to be welded, so as to reduce thermal stress during welding, wherein the preheating temperature is set according to actual conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the titanium tube welding equipment of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the clamping assembly of the present invention;

[0026] Figure 3 It is a bottom view schematic diagram of the clamping assembly of the present invention.

[0027] Explanation of the numbers in the figure: 1. Workbench; 2. Welding assembly; 201. Robot arm; 202. Welding gun; 3. Clamping assembly; 301. Clamping mechanism; 302. Moving block; 303. Limiting block; 304. Anti-slip protrusion; 305. Slide groove; 306. Slider A; 307. Threaded rod; 308. Slider B; 309. Fixed rod; 310. Support; 311. First connecting rod; 312. Second connecting rod; 313. Spring; 314. Shift ring A; 315. Shift ring B; 316. Cylinder; 4. Slide rail; 5. Bracket; 6. Support plate; 601. Limiting groove. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] Example:

[0030] See also Figure 1-3 , a titanium tube welding process, comprising the following steps:

[0031] Clean and treat the welding parts of the titanium tube to ensure that the surface is smooth, free of oil and oxides; for example, the titanium tube to be welded is first immersed in the degreasing liquid for alkaline washing for degreasing treatment, and then wiped dry with absorbent cotton; then placed in the pickling liquid for pickling treatment for 10 minutes, rinsed with clean water after being taken out, and finally immersed in acetone for 2-3 minutes, taken out and dried for standby use. The degreasing liquid is a 20% mass concentration NaOH aqueous solution, the degreasing treatment temperature is 40-50℃, and the time is 10-15 minutes; the pickling liquid is a mixture of 1% hydrochloric acid and 1% nitric acid in a volume ratio of 3:1. Before welding, various impurities remaining on the surface of the pipe can be thoroughly removed, and the weld will be smoother and more precise after welding.

[0032] The two titanium tubes to be welded are fixed on the clamping assembly 3, so that the distance between the two titanium tubes is maintained at 1.5-2.0mm, and the welding environment is a closed welding environment, wherein the air humidity is 30-60%, and the temperature is 15°C-25°C; when clamping the titanium tube, the piston rod of the cylinder 316 is extended to drive the first connecting rod 311 to rotate away from the bracket 5. At this time, the first connecting rod 311 pushes the second connecting rod 312 to move inward, and the second connecting rod 312 pushes the fixed rod 309 to move, thereby pushing the moving block 302 and the limit block 303 to move inward, so that the limit blocks 303 on both sides are close to each other, so as to achieve the purpose of clamping the titanium tube

[0033] Before welding, the titanium tube is preheated to reduce the thermal stress during welding, wherein the preheating temperature is set according to the actual situation, and the preheating component can be set in the limit block 303, and then the titanium tube is welded using the welding component 2; after the titanium tube is welded, the piston rod of the cylinder 316 is contracted to drive the first connecting rod 311 to rotate toward the side of the bracket 5, at which time the first connecting rod 311 pulls the second connecting rod 312 to move toward the side of the bracket 5, thereby pulling the fixed rod 309 to move outward, and the fixed rod 309 drives the moving block 302 and the limit block 303 to move, thereby releasing the titanium tube.

[0034] The welded titanium tube is placed in a vacuum annealing furnace for annealing at a temperature of 550°C and an annealing holding time of 65 minutes to obtain a welded titanium tube;

[0035] Finally, the weld surface of the welded titanium tube is cleaned and the weld quality is tested.

[0036] Specifically, a workbench 1 is provided on one side of the welding assembly 2, and a clamping assembly 3 is provided on the top surface of the workbench 1 for fixing the titanium tube to be welded. The clamping assembly 3 includes two sets of relatively arranged clamping mechanisms 301, and a moving block 302 is connected to the inner side of the clamping mechanism 301. The clamping mechanism 301 is used to push the moving block 302 to move so that the two moving blocks 302 move relative to each other. Bumps A are provided on both sides of the moving block 302, and a limit block 303 is movably connected to the bump A. The titanium tube to be welded is clamped between the two relatively arranged limit blocks 303. The bottom surface of the limit block 303 is set as an arc surface, and the setting of the arc surface is more in line with the outer wall of the titanium tube. The arc surface is provided with an anti-slip protrusion 304 to prevent the tube from shifting or rotating. A preheating assembly can be provided in the limit block 303 to preheat the titanium tube to be welded.

[0037] In the present application, the tightening mechanism 301 includes a fixed rod 309, a support 310 is arranged on one side of the fixed rod 309, the support 310 is installed on the workbench 1, the fixed rod 309 passes through the support 310, and the fixed rod 309 and the support 310 are slidably matched, and a pushing member is arranged on the outer side of the support 310, the pushing member is rotatably connected to the fixed rod 309, and the pushing member can push the fixed rod 309 to move along its length direction.

[0038] In the present application, the pushing member includes a first connecting rod 311 and a second connecting rod 312, one end of the second connecting rod 312 is rotatably connected to a position near the middle of the first connecting rod 311, and the other end of the second connecting rod 312 is rotatably connected to the fixed rod 309; wherein the sizes of the first connecting rod 311 and the second connecting rod 312 are not limited to the sizes shown in the figure.

[0039] One outer end of the support 310 extends to the end of the first connecting rod 311 and is rotatably connected to the first connecting rod 311. A cylinder 316 is arranged above the other end of the first connecting rod 311. A bracket 5 is arranged on the top surface of the workbench 1. The cylinder 316 is inclined and installed on the bracket 5. The cylinder 316 is used to push the first connecting rod 311 to rotate around the axis connected to the support 310, and the second connecting rod 312 connected to the middle part of the first connecting rod 311 will drive the fixed rod 309 to reciprocate as the first connecting rod 311 moves.

[0040] When the piston rod of the cylinder 316 extends and drives the first connecting rod 311 to rotate away from the bracket 5, the first connecting rod 311 pushes the second connecting rod 312 to move inward, and the second connecting rod 312 pushes the fixed rod 309 to move, thereby pushing the moving block 302 and the limit block 303 to move inward, so that the limit blocks 303 on both sides are close to each other, thereby achieving the purpose of clamping the titanium tube.

[0041] When the piston rod of the cylinder 316 contracts and drives the first connecting rod 311 to rotate toward the side of the bracket 5, the first connecting rod 311 pulls the second connecting rod 312 to move toward the side of the bracket 5, thereby pulling the fixed rod 309 to move outward, and the fixed rod 309 drives the moving block 302 and the limit block 303 to move, thereby achieving the purpose of loosening the titanium tube.

[0042] In the present application, a slide groove 305 is provided on the projection A, and a slider A306 is provided on the limit block 303. The slider A306 is slidably matched with the slide groove 305. A threaded rod 307 is rotatably connected to the slider A306, and the threaded rod 307 is threadedly connected to the projection A. When the diameter of the clamped titanium tube changes, the slider A306 slides in the slide groove 305 by rotating the threaded rod 307, thereby adjusting the position of the limit block 303, so as to facilitate the clamping and fixing of titanium tubes of different sizes.

[0043] In a possible embodiment, a hydraulic rod may be used instead of the threaded rod 307 to achieve the purpose of automatic adjustment.

[0044] In the present application, a slider B308 is provided at the bottom of the moving block 302, and a slide rail 4 is provided on the top surface of the workbench 1. The slider B308 slides with the slide rail 4, and the slide rail 4 cooperates with the slider B308 to limit the moving track of the moving block 302. A mounting hole is provided in the middle of the slide rail 4, and the slide rail 4 is fixed to the top surface of the workbench 1 by bolts.

[0045] In the present application, a spring 313 is provided on the inner end of the fixed rod 309, and the spring is used to apply a certain thrust to the moving block 302 to prevent the moving block 302 from being clamped too tightly and damaging the titanium tube. A stop ring A314 and a stop ring B315 are respectively provided on both sides of the spring 313, and the inner end of the fixed rod 309 is connected to the moving block 302.

[0046] Among them, the gear ring A314 is fixedly connected to the fixed rod 309, and the gear ring B315 is slidably matched with the fixed rod 309. Through the cooperation between the gear ring B315 and the fixed rod 309, when the moving block 302 clamps the titanium tube, when the moving block 302 is subjected to reverse thrust, it will push the gear ring B315 to squeeze the spring 313, thereby preventing the titanium tube from being clamped too much.

[0047] Among them Figure 2As shown in the figure, a groove is provided on the middle part of the moving block 302 near the support 310, and two protrusions B are arranged opposite to each other in the groove. The fixing rod 309 passes through the two protrusions B, and there is a certain distance between the protrusion B and the retaining ring A314, which is the maximum displacement that the spring 313 can move when it is squeezed. By limiting the moving displacement, it is ensured that the force of the limit block 303 clamping the titanium tube is not too small, and the titanium tube is ensured not to loosen when clamping. A baffle is connected to the end of the fixing rod 309, and the baffle is connected and fixed to the moving block 302. A nut is set at the end of the fixing rod 309 to prevent the fixing rod 309 from slipping out.

[0048] In the present application, the welding assembly 2 includes a mechanical arm 201 disposed on one side of the workbench 1, and a welding gun 202 is disposed on the mechanical arm 201. The welding gun 202 is driven by the mechanical arm 201 to weld the titanium tube to be welded.

[0049] By arranging flipping mechanical claws on both sides of the clamping assembly 3, the titanium tube can be flipped and the other side of the titanium tube can be welded.

[0050] In the present application, a support plate 6 is provided on the top surface of the workbench 1 between the two moving blocks 302 , and a limiting groove 601 is provided on the top surface of the support plate 6 , and the titanium tube to be welded is located above the limiting groove 601 .

[0051] Working principle: two titanium tubes to be welded are placed in the limit groove 601 on the top surface of the support plate 6 respectively, and the opposite ends of the two titanium tubes are located in the middle of the limit groove 601. Then, the piston rod of the cylinder 316 is extended to drive the first connecting rod 311 to rotate away from the bracket 5. At this time, the first connecting rod 311 pushes the second connecting rod 312 to move inward, and the second connecting rod 312 pushes the fixed rod 309 to move, thereby pushing the moving block 302 and the limit block 303 to move inward, so that the limit blocks 303 on both sides are close to each other and contact the outer wall of the titanium tube. At this time, according to the different sizes of the titanium tube, the position of the limit block 303 is adjusted by rotating the threaded rod 307, so that the inner side of the limit block 303 is close to the surface of the titanium tube. When the moving block 302 clamps the titanium tube, when the moving block 302 is subjected to reverse thrust, it will push the gear ring B315 to squeeze the spring 313, thereby preventing the titanium tube from being clamped too much and damaging the surface of the titanium tube.

[0052] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A titanium tube welding process, characterized in that: The steps include: Clean and treat the welding parts of the titanium tube to ensure that the surface is smooth, free of oil and oxide; Fix the two titanium tubes to be welded on the clamping assembly (3) so that the distance between the two titanium tubes is maintained at 1.5-2.0 mm; Before welding, the titanium tube is preheated, and then the titanium tube is welded using a welding assembly (2); The welded titanium tube is placed in a vacuum annealing furnace for annealing at a temperature of 550°C and an annealing holding time of 65 minutes to obtain a welded titanium tube; Clean the weld surface of the welded titanium tube and inspect the weld quality; A workbench (1) is arranged on one side of the welding assembly (2), and the clamping assembly (3) comprises two sets of clamping mechanisms (301) arranged opposite to each other, a moving block (302) is connected to the inner side of the clamping mechanism (301), protrusions A are arranged on both sides of the moving block (302), a limiting block (303) is movably connected to the protrusion A, and the bottom surface of the limiting block (303) is arranged as a circular arc surface, and an anti-slip protrusion (304) is arranged on the circular arc surface.

2. A titanium tube welding process according to claim 1, characterized in that: The tightening mechanism (301) comprises a fixing rod (309), a support (310) is arranged on one side of the fixing rod (309), the fixing rod (309) passes through the support (310), and the fixing rod (309) and the support (310) are slidably matched, and a pushing member is arranged on the outer side of the support (310), and the pushing member is rotatably connected to the fixing rod (309).

3. A titanium tube welding process according to claim 2, characterized in that: The pushing member comprises a first connecting rod (311) and a second connecting rod (312), one end of the second connecting rod (312) is rotatably connected to the first connecting rod (311), and the other end of the second connecting rod (312) is rotatably connected to the fixing rod (309); One outer end of the support (310) extends to the end of the first connecting rod (311) and is rotatably connected to the first connecting rod (311); a cylinder (316) is arranged above the other end of the first connecting rod (311); a bracket (5) is arranged on the top surface of the workbench (1); the cylinder (316) is arranged obliquely, and the cylinder (316) is installed on the bracket (5).

4. A titanium tube welding process according to claim 1, characterized in that: The protrusion A is provided with a sliding groove (305), the limiting block (303) is provided with a sliding block A (306), the sliding block A (306) is slidably matched with the sliding groove (305), the sliding block A (306) is rotatably connected with a threaded rod (307), and the threaded rod (307) is threadedly connected with the protrusion A.

5. The titanium tube welding process according to claim 1, characterized in that: A slider B (308) is provided at the bottom of the moving block (302), a slide rail (4) is provided on the top surface of the workbench (1), and the slider B (308) is slidably matched with the slide rail (4).

6. A titanium tube welding process according to claim 2, characterized in that: The inner end of the fixed rod (309) is sleeved with a spring (313), and a stop ring A (314) and a stop ring B (315) are respectively arranged on both sides of the spring (313). The inner end of the fixed rod (309) is connected to the moving block (302).

7. A titanium tube welding process according to claim 6, characterized in that: The gear ring A (314) is fixedly connected to the fixing rod (309), and the gear ring B (315) is slidably matched with the fixing rod (309); A groove is provided in the middle of the moving block (302), two protrusions B are arranged opposite to each other in the groove, and the fixing rod (309) passes between the two protrusions B.

8. The titanium tube welding process according to claim 1, characterized in that: The welding assembly (2) comprises a mechanical arm (201) arranged on one side of the workbench (1), and a welding gun (202) is arranged on the mechanical arm (201).

9. A titanium tube welding process according to claim 1, characterized in that: A support plate (6) is provided on the top surface of the workbench (1) between the two moving blocks (302), and a limiting groove (601) is provided on the top surface of the support plate (6).

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