Deep hole welding repair method

Abstract

The invention relates to the technical field of petrochemical pipeline welding, in particular to a deep hole welding repair method which achieves automatic welding repair of welding seams by building a simple supporting mechanism and using an automatic welding machine and can achieve automatic welding of multiple welding seams through a sliding table module and a servo motor. Triple protection of the welding seam is achieved through the welding seam back face and welding seam front face inert gas protection technology. The welding process is divided into bottoming, filling, pavement and multi-pass welding, welding beads are divided into eight areas, the problem that upslope welding seams are concave inwards is avoided, the advancing and retreating functions of the sliding table module are utilized, human manual swing welding of the welding seams is simulated, and the appearance quality of the welding seams is improved. All-position GTAW welding is used in the welding process, multiple weld joints can be welded at a time, partition of the weld joints is carried out, the weld joints are prevented from being concaved inwards, repair can be carried out in a narrow pipe box and on a device line, and compared with a traditional manual welding repair method, the repair welding efficiency and quality are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of petrochemical pipeline welding, and specifically relates to a method for repairing deep-hole welding. Background Art

[0002] In the fields of chemical industry, petroleum, medicine, atomic energy, and nuclear industry, heat exchangers are widely used, and among them, shell-and-tube heat exchangers are the most commonly used. In the design, manufacturing, etc. of shell-and-tube heat exchangers, the quality of the welding between the heat exchange tubes and the tube holes on the tube sheet determines the quality and service life of the heat exchanger. In a conventional welding structure, there are gaps between the tube holes and the heat exchange tubes, which are prone to problems such as crevice corrosion and overheating. Inner hole welding can overcome the above problems, and long-distance inner hole welding is usually called deep-hole welding. When manufacturing the equipment, after the deep-hole welding between the tube holes on the tube sheet and the heat exchange tubes is completed, it is necessary to detect and flaw detect the weld seams of the deep-hole welding between the heat exchange tubes and the tube sheet to check whether the weld seams of the deep-hole welding are qualified. If there are problems with the weld seams, repair is required.

[0003] For the repair welding of on-site weld seams, some may be welded inside the tube box or on the refining on-site line. The space is narrow, and welding robots or traditional welding machines cannot be used. Therefore, most on-site repairs are carried out by manual welding. Manual welding for repair welding has the following limitations: the diameter of the heat exchange tube is small and the depth is deep. It is impossible to accurately align the root of the weld seam with manual welding, so it is impossible to ensure that the weld seam is penetrated. At the same time, restricted by manual work, the welding technology requirements for people are relatively high, and the surface quality of the weld seam cannot be guaranteed, easily resulting in quality defects such as uneven weld seams or undercut. At the same time, the purchase of a special hanging welding machine has a high price and a small scope of application. Summary of the Invention

[0004] In view of all or part of the above technical problems existing in the prior art, the present invention provides a method for repairing deep-hole welding.

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

[0006] Provide a method for repairing deep-hole welding, which is used to remove and re-weld the defective weld seams between the tube sheet and the heat exchange tubes. The characteristics are as follows: it includes the following steps:

[0007] Defective weld seam removal step: Use a weld seam removal tool to remove the defective circumferential weld seam between the tube sheet and the heat exchange tubes, and process a groove;

[0008] Welding preparation step: Build a support mechanism and a deep-hole welding machine. The deep-hole welding machine includes a wire feeder, a welding head, and a slide table module. The welding head includes a welding torch head, a gas blowing component, and a tungsten electrode. The tungsten electrode is located at the end of the welding torch head, and the gas blowing component is located beside the tungsten electrode to spray inert gas; The welding head is equipped with a first servo motor for driving the welding torch head to rotate;

[0009] The support mechanism uses the tube holes of the tube sheet as support points to support the entire deep-hole welding machine.

[0010] The sliding table module is installed on the support mechanism, and the wire feeder and the welding head are installed on the sliding table module. The sliding table module is used to drive the welding head to move, align the welding torch head with the tube hole where the weld to be repaired is located, and enable the tungsten electrode and the gas blowing component to move forward or backward manually or automatically towards / away from the groove; the wire feeder is used to supply welding wire to the welding head.

[0011] Alignment step: Adjust the sliding table module to the manual mode, put the positioning sleeve outside the welding torch head and clamp one end of it in the positioning hole of the welding head itself, manually move the welding head and the positioning sleeve towards the tube hole, insert and clamp the other end of the positioning sleeve into the tube hole to achieve coaxial positioning of the welding head and the tube hole; then move the welding head in the reverse direction, the positioning sleeve disengages from the tube hole, and move the positioning sleeve away from the welding head.

[0012] Measure the distance between the groove and the end face of the tube sheet, and based on this distance, measure the relative position of the tungsten electrode to the welding torch head, and align this position with the end face of the tube sheet to determine that the tungsten electrode is aligned with the groove.

[0013] Welding step: Along the direction of the tube hole axis, the circumferential direction of the groove is divided into eight zones, each zone covers 45° - 50°, and the total coverage is 370° - 400°. The area exceeding 360° in one circle is the overlapping zone; the zones in the upper and lower parts are the flat welding zones, and the zones on the left and right sides are the uphill welding zone and the downhill welding zone respectively according to the welding direction.

[0014] The current used in the uphill welding zone is A1, the current used in the flat welding zone is A2, and the current used in the downhill welding zone is A3, where A3 > A2 > A1.

[0015] The welding process of each zone includes a backing pass, a filling pass, and a capping pass in sequence. In the backing pass, the wire feeder stops feeding the welding wire, and the groove self-fusion method is adopted; in the filling pass and the capping pass, the wire feeder continuously feeds the wire, and the sliding table module drives the welding head to continuously move back and forth in the automatic mode, driving the tungsten electrode to perform a swinging welding back and forth.

[0016] Protection step: Use inert gas to discharge the air in the shell-side space surrounded by the cylinder body and the tube sheets at both ends. At the same time, use an oxygen detector to detect the oxygen content in the shell-side space to ensure that the oxygen content in the shell-side space is lower than the preset value during the above welding step; and at the same time, the gas blowing component sprays inert gas.

[0017] Inspection step: During the welding step, observe the forming condition of the back of the weld through an endoscope inserted into the shell-side space.

[0018] Specifically, the support mechanism includes a support pipe and a steel plate platform. The support pipe is partially inserted into the pipe holes of the tube sheet, and the steel plate platform is horizontally fixed to the section of the support pipe extending outside the pipe holes. The deep-hole welding machine is installed on the steel plate platform.

[0019] Specifically, the sliding table module includes a first sliding table and a second sliding table that are perpendicular and horizontal. The first sliding table is installed on the steel plate platform, and the second sliding table is arranged front and back on the first sliding table. The wire feeder and the welding head are installed on the second sliding table. The first sliding table is equipped with a handwheel to drive the second sliding table to move left and right. The second sliding table is equipped with a second servo motor to automatically drive the welding head to move back and forth.

[0020] Specifically, a leveling mechanism is provided between the first sliding table and the steel plate platform to adjust the flatness of the first sliding table and its height relative to the steel plate platform.

[0021] Specifically, the leveling mechanism includes a plurality of leveling screws that pass through the steel plate platform and abut against the first sliding table upward.

[0022] Specifically, the gas blowing assembly includes a ceramic nozzle and a microporous aeration head. The tungsten electrode is arranged at the end of the microporous aeration head, and the ceramic nozzle is located beside the tungsten electrode. Both the ceramic nozzle and the microporous aeration head are connected to the peripheral inert gas supply mechanism.

[0023] Specifically, there is a clearance fit between the positioning sleeve and the positioning hole of the welding head, and the clearance is 0.02 - 0.05 mm. There is also a clearance fit between the positioning sleeve and the pipe hole, and the clearance is 0.02 - 0.05 mm.

[0024] Specifically, in the welding step, in the counterclockwise direction, the uphill welding area is the 5 - 1 o'clock area, the flat welding area is the 1 - 11 o'clock and 7 - 5 o'clock areas, and the downhill welding area is the 11 - 7 o'clock area.

[0025] In the defective weld removal step, the weld removal tool used includes a main shaft, a positioning sleeve, an outer base sleeve, and a tool assembly. The outer base sleeve includes a fixed sleeve and a sliding sleeve. The sliding sleeve is coaxially inserted through the fixed sleeve. The positioning sleeve is coaxially installed at the end of the fixed sleeve and is used to coaxially insert and lock to the peripheral hole opening.

[0026] A bearing is provided between the fixed sleeve and the positioning sleeve to enable relative rotation between the two.

[0027] The main shaft coaxially passes through the outer base sleeve and the positioning sleeve, and the main shaft, the sliding sleeve, and the fixed sleeve rotate together. The main shaft can axially move relative to the outer base sleeve within a preset range. The main shaft is provided with a tool holder groove along its length direction, and the tool holder groove has a first inclined surface.

[0028] The tooling assembly includes a tool holder seat, a blade, and a resilient piece. The blade is fixed to the tool holder seat. The tool holder seat is provided with a second inclined surface. Two ends of the resilient piece are respectively connected to a sliding sleeve and the tool holder seat to keep the second inclined surface in close contact with the first inclined surface. The axial movement of the main shaft drives the tool holder seat and the blade to radially approach / away from the weld to be repaired.

[0029] The sliding sleeve is installed between the fixed sleeve in a releasable manner so that the sliding sleeve can be axially adjusted by a preset distance and then locked to the fixed sleeve to adjust the distance between the blade and the positioning sleeve.

[0030] Specifically, a spring sleeve is fixed to the main shaft. A compression spring is arranged in the spring sleeve. The compression spring respectively abuts against the spring sleeve and the sliding sleeve to enable the main shaft to maintain the potential energy for resetting to the initial state.

[0031] Specifically, a first stop step is arranged on the outer side of the main shaft, and a second stop step is arranged on the inner side of the sliding sleeve. In the initial state, the first stop step axially abuts against the second stop step.

[0032] Specifically, the spring sleeve and the main shaft, the tool holder seat and the blade, the sliding sleeve and the main shaft, the resilient piece and the sliding sleeve, and the fixed sleeve and the sliding sleeve are respectively installed via setscrews.

[0033] Specifically, a guiding groove arranged axially is provided on the outer side of the main shaft, and a guide pin embedded in the guiding groove is arranged on the sliding sleeve.

[0034] Specifically, an annular groove is provided on the outer side of the positioning sleeve, and a snap ring is embedded in the annular groove to axially limit the fixed sleeve.

[0035] Specifically, the tool holder seat is provided with a locking groove, and the end of the resilient piece is bent and embedded in the locking groove. The tooling assembly further includes a pressing block and a locking screw. The locking screw fixes the pressing block to the tool holder seat, and the pressing block presses the resilient piece.

[0036] Specifically, a positioning convex ring is provided on the outer side of the positioning sleeve.

[0037] Specifically, a Morse taper shank is provided at the end of the main shaft.

[0038] Specifically, a chip removal port communicating with the tool holder groove is provided at the end of the main shaft.

[0039] The beneficial effects of the present invention:

[0040] A deep-hole welding repair method of the present invention realizes the automatic welding repair of welds by building a simple support mechanism and using an automatic welding machine. The automatic welding of multiple welds can be achieved through a sliding table module and a servo motor. Triple protection of the weld is realized through the inert gas protection technology on the back and front of the weld. The welding process is divided into multiple passes of backing, filling, and surfacing, and the weld beads are divided into eight zones to avoid the problem of concave in the uphill weld. By using the forward and backward functions of the sliding table module, the weld is simulated to swing manually, improving the appearance quality of the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present invention will be further described below with reference to the drawings. However, the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on the following drawings without creative work.

[0042] Figure 1 It is a schematic diagram of a deep-hole welding repair method in an embodiment.

[0043] Figure 2 It is a schematic diagram of the assembly step in an embodiment.

[0044] Figure 3 It is a schematic diagram of argon protection inside the hole in an embodiment.

[0045] Figure 4 It is a schematic diagram of the weld zone division in the welding step in an embodiment.

[0046] Figure 5 It is a schematic diagram of the structure of an adjustable deep-hole weld removal tool in an embodiment.

[0047] Figure 6 It is a schematic diagram of the structure when an adjustable deep-hole weld removal tool in an embodiment is combined with a deep-hole weld structure.

[0048] Figure 7 It is a schematic diagram of a spring sleeve in an embodiment.

[0049] Figure 8 It is a schematic diagram of a fixed sleeve in an embodiment.

[0050] Figure 9 It is a schematic diagram of a sliding sleeve in an embodiment.

[0051] Figure 10 It is a schematic diagram of another perspective of the sliding sleeve in an embodiment.

[0052] Figure 11 It is a schematic diagram of a positioning sleeve in an embodiment.

[0053] Figure 12 It is a top view of the main shaft in an embodiment.

[0054] Figure 13 It is a side view of the main shaft in the embodiment, showing the tool holder groove and chip removal port in the middle part.

[0055] Reference numerals:

[0056] Tube sheet 01, tube hole 011, short cylinder 012, heat exchange tube 02, weld 03, cylinder 04, shell side space 05, flange 06, air inlet 07;

[0057] Support mechanism 100, support tube 101, steel plate platform 102;

[0058] Deep hole welding machine 200, wire feeder 201, welding head 202, welding torch head 203, tungsten electrode 204;

[0059] Slide table module 300, first slide table 301, second slide table 302, second servo motor 3021;

[0060] Blowing component 400, tile nozzle 401, microporous aeration head 402;

[0061] Leveling mechanism 500, positioning sleeve 600, endoscope 700, oxygen detector 800.

[0062] Main shaft 1, tool holder groove 11, first inclined surface 12, first stop step 13, guide groove 14, Morse taper shank 15, chip removal port 16;

[0063] Positioning sleeve 2, annular groove 21, snap ring 22, positioning convex ring 23;

[0064] Outer base sleeve 3, second stop step 31, fixing sleeve 32, sliding sleeve 33;

[0065] Tool component 4, tool holder seat 41, second inclined surface 411, locking groove 412, blade 42, elastic piece 43, pressing block 44, locking screw 45;

[0066] Bearing 5, spring sleeve 6, compression spring 7;

[0067] First machine screw 81, second machine screw 82, third machine screw 83, fourth machine screw 84, fifth machine screw 85. Specific implementation mode

[0068] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0069] A deep hole welding repair method in this embodiment is as Figures 1 to 4As shown in the figure, the tube sheet 01, the heat exchange tube 02, and the weld 03 form a deep-hole weld structure. A short cylinder 012 extends inward at the tube hole 011 of the tube sheet 01, and the heat exchange tube 02 is connected to the short cylinder 012 to form a connection of the weld 03. This repair method aims to remove the problematic weld 03, machine a weld groove, and re-weld.

[0070] This repair method includes the following steps:

[0071] Defective weld removal step: Use a weld removal tool to remove the defective circumferential weld between the tube sheet 01 and the heat exchange tube 02 and machine a groove.

[0072] Welding preparation step: Build a support mechanism 100 and a deep-hole welding machine 200. The deep-hole welding machine 200 includes a wire feeder 201, a slide table module 300, and a welding head 202. The welding head 202 includes a welding torch head 203, a gas blowing assembly 400, and a tungsten electrode 204. The tungsten electrode 204 is located at the end of the welding torch head 203, and the gas blowing assembly 400 is located beside the tungsten electrode 204 to spray inert gas. Specifically, the gas blowing assembly 400 includes a ceramic nozzle 401 and a microporous aeration head 402. The tungsten electrode 204 is arranged at the end of the microporous aeration head 402, and the ceramic nozzle 401 is located beside the tungsten electrode 204. Both the ceramic nozzle 401 and the microporous aeration head 402 are connected to the external inert gas supply mechanism, and both the microporous aeration head 402 and the ceramic nozzle 401 can disperse inert gas. The welding head 202 is equipped with a first servo motor (not shown in the figure) for driving the welding torch head 203 to rotate, driving the welding torch head 203 to perform a rotational movement. The welding head 202 is a prior art, and the microporous aeration head 402 is also called a metal sintered porous filter element, which is an externally purchased component and will not be elaborated here.

[0073] The support mechanism 100 uses the tube hole 011 of the tube sheet 01 as a support point to support the entire deep-hole welding machine 200. Specifically, the support mechanism 100 includes a support tube 101 and a steel plate platform 102. The support tube 101 is partially inserted into other tube holes 011 near the tube hole 011 where the weld to be repaired of the tube sheet 01 is located, and the steel plate platform 102 is horizontally welded and fixed to the section of the support tube 101 extending outside the tube hole 011. The number of support tubes 101 is two, and the specifications of the support tubes 101 are close to the inner hole specifications, and the outer diameter is 0.5 - 1 mm smaller than the inner diameter of the tube hole 011.

[0074] The slide table module 300 is installed on the steel plate platform 102, the wire feeder 201 and the welding head 202 are installed on the slide table module 300. The slide table module 300 is used to drive the welding head 202 to move, align the welding torch head 203 with the tube hole 011 where the weld to be repaired is located, and enable the tungsten electrode 204 and the gas blowing assembly 400 to move forward / backward close to / away from the groove manually or automatically. The wire feeder 201 is used to supply welding wire to the welding head 202.

[0075] Specifically, the sliding table module 300 includes a first sliding table 301 and a second sliding table 302 that are perpendicular and horizontally arranged. The first sliding table 301 is installed on the steel plate platform 102, and the second sliding table 302 is arranged front and back on the first sliding table 301. The wire feeder 201 and the welding head 202 are installed on the second sliding table 302. The first sliding table 301 is configured with a handwheel to drive the second sliding table 302 to move left and right, thereby driving the welding head 202 and the wire feeder 201 to move left and right. The second sliding table 302 is equipped with a second servo motor 3021 to drive the welding head 202 to move automatically back and forth, aiming to automatically drive the welding torch head 203 in and out of the tube hole 011. The "front and back" here corresponds to Figure 1 the left and right directions in Figure 1 , that is, the direction close to / away from the end face of the tube sheet 01; the "left and right" corresponds to Figure 1 the direction perpendicular to the paper surface in Figure 1 .

[0076] Specifically, a leveling mechanism 500 is provided between the first sliding table 301 and the steel plate platform 102, which is used to adjust the flatness of the first sliding table 301 and its height relative to the steel plate platform 102, so that the steel plate platform 102 is in a horizontal state, ensuring that the welding torch head 203 is perpendicular to the end face of the tube sheet 01, and the perpendicularity is within 0.1 mm. At the same time, enough space is left on the steel plate platform 102 to withdraw the torch head.

[0077] Specifically, the leveling mechanism 500 includes a plurality of leveling screws that pass through the steel plate platform 102 and abut against the first sliding table 301 upward. In this embodiment, four are provided, which are respectively located at the four corner positions of the first sliding table 301.

[0078] Pairing step: In order to ensure that the coaxiality between the welding head 202 and the tube hole 011 is within 0.1 mm, a positioning sleeve 600 is used to improve the positioning accuracy. Adjust the sliding table module 300 to the manual mode, put the positioning sleeve 600 outside the welding torch head 203 and one end of it is clamped in the positioning hole of the welding head 202 itself. Manually move the welding head 202 and the positioning sleeve 600 towards the tube hole 011, so that the other end of the positioning sleeve 600 is inserted into and clamped in the tube hole 011 to realize the coaxial positioning of the welding head 202 and the tube hole 011. Then make the welding head 202 move in the reverse direction, the positioning sleeve 600 is separated from the tube hole 011, and the positioning sleeve 600 is moved away from the welding head 202. If there is a phenomenon of non - concentricity, it can be corrected by finely adjusting the leveling mechanism 500 to move the sliding table assembly and the welding torch head 203 thereon up and down, and rotating the handwheel of the first sliding table 301 to move the welding torch head 203 left and right. The outer diameter of the positioning sleeve 600 can be replaced according to the diameter of the tube hole 011 to adapt to different specifications of the heat exchange tubes 02 or tube holes 011.

[0079] Confirm that the position of the tungsten electrode 204 is aligned with the root of the weld seam. Adopt a double-insurance method of measurement + observation method. Measure the distance between the groove and the end face of the tube sheet 01. Based on this distance, measure the relative position of the tungsten electrode 204 to the welding torch head 203, and align this position with the end face of the tube sheet 01 to determine that the tungsten electrode 204 is aligned with the groove. Observe whether the tungsten electrode 204 is aligned through the endoscope 700. At the same time, observe the rotation of the tungsten electrode 204 during the welding process to ensure that the tungsten electrode 204 always maintains the correct position throughout the welding process, and at the same time, the distance between the end of the tungsten electrode 204 and the welded surface is always 0.1 - 0.2 mm.

[0080] Specifically, there is a clearance fit between the positioning sleeve 600 and the positioning hole of the welding machine head 202, and the fit clearance is 0.02 - 0.05 mm; there is a clearance fit between the positioning sleeve 600 and the tube hole 011, and the fit clearance is 0.02 - 0.05 mm.

[0081] Welding steps: Along the axis direction of the tube hole 011, the circumference of the groove is divided into eight zones, each zone covering 45° - 50°, with a total coverage of 370° - 400°. The area exceeding 360° in one circle is the overlap zone; the zones in the upper and lower parts are the flat welding zones, and the zones on the left and right sides are the uphill welding zone and the downhill welding zone respectively according to the welding direction.

[0082] The current used in the uphill welding zone is A1, the current used in the flat welding zone is A2, and the current used in the downhill welding zone is A3, A3 > A2 > A1. That is, the current of the welding torch head 203 in the uphill welding zone is appropriately reduced to reduce the sag of the molten pool, and the wire feeding speed of the wire feeder 201 is increased to enhance filling. In the flat welding zone, the current is medium, and the pulse is used to control the molten pool, and the welding speed is uniform to avoid undercutting. In the downhill welding zone, the welding torch head 203 uses a higher current to stabilize the molten pool by gravity, and at the same time, the flow rate of the inert gas is increased to ensure sufficient protection.

[0083] The welding process of each zone includes in sequence a backing pass, a filling pass, and a capping pass. In the backing pass, the wire feeder 201 stops feeding the welding wire, and the groove self-fusion method is adopted; in the filling pass and the capping pass, the wire feeder 201 continuously feeds the wire, and the slide table module 300 drives the welding machine head 202 to continuously move back and forth in the automatic mode, driving the tungsten electrode 204 to perform a swinging welding back and forth. The forward and backward amplitude and trajectory can be adjusted through the program, simulating the welding torch trajectory swing of manual welding. Using a 45° welding torch head can weld a relatively flat and wider weld seam, reducing the number of multi-layer filling and surfacing times, thereby effectively reducing the interlayer temperature of the weld, reducing the melting time of the weld, avoiding the concave of the weld, especially the problem of the gravity drop of the uphill welding molten pool, realizing single-layer single-pass welding forming, and rapidly improving the welding quality and welding efficiency.

[0084] The welding filling process and the capping process can be automatically completed under the program control of the control module. The entire filling and surfacing process requires no manual intervention. Through the wire feeder 201, the servo motors of the sliding table module 300, and the motors of the welding head 202, linkage is achieved under the control of the established program. Multiple weld seams can be welded until the entire weld seam is filled, saving the steps of the welder moving the position of the welding torch for weld bead distribution and constantly observing the forming situation to control the wire feeding speed, which will greatly reduce the labor intensity of the workers.

[0085] Specifically, in this welding step, in the counterclockwise direction, the uphill welding area is the 5 - 1 o'clock area, the flat welding area is the 1 - 11 o'clock and 7 - 5 o'clock areas, and the downhill welding area is the 11 - 7 o'clock area. Area 1: 4 - 6 o'clock direction (starting arc point Q), covering 45° - 50°. Areas 2 - 8: Divided counterclockwise in sequence, each area is 45° - 50°. The overlapping area: The last partition (area 8) extends to the arc extinguishing point S, which is 10° - 40° before the starting arc point Q, to complete the overlap.

[0086] Protection step: Input inert gas from the air inlet 07 at the bottom of the cylinder body 04, and use the inert gas to discharge the air in the shell - side space 05 surrounded by the cylinder body 04 and the tube sheets 01 at both ends. At the same time, use an oxygen detector 800 to detect the oxygen content in the shell - side space 05 to ensure that the oxygen content in the shell - side space 05 is lower than the preset value during the above - mentioned welding step. Generally, ensure that the oxygen content in the shell during welding is lower than 5%. At the same time, the blowing component 400 sprays inert gas. Specifically, the inert gas exits from one end of the welding torch head 203 through the microporous aeration head 402, making the inert gas evenly spread on the front of the weld seam, so that the just - welded but still high - temperature (high temperature is prone to oxidation) weld seam is in a low - oxygen environment, thus playing an anti - oxidation role. Especially in multi - layer welding, the protection effect is obvious; at the same time, inert gas is passed inside the nozzle 401 to protect the welding molten pool with inert gas, forming triple protection inside and outside the weld seam. The oxygen detector 800 is a pump - type oxygen - absorbing instrument that can always extract the gas in the shell - side space 05 for oxygen content detection and has an alarm function.

[0087] The inert gas can be argon, nitrogen, etc.

[0088] Inspection step: During the welding step, observe the forming situation of the back of the weld seam through the endoscope 700 penetrating into the shell - side space 05 to ensure that the weld seam is fused and penetrated, and take pictures for record at the same time. After welding is completed, use the endoscope 700 again to conduct 100% visual inspection on the front of the weld seam, and use PT and helium leak detection methods to detect whether the weld seam is qualified. The endoscope 700 is equipped with a steerable probe, which can penetrate into the shell - side space 05 through the flange 06 of the cylinder body 04 to observe and repair the forming situation of the back of the weld seam. At the same time, the endoscope 700 has a specific photographing function, and the photographed pictures have a watermark function.

[0089] The repair method adopts an automatic welding method, which can perform welding in a narrow space, such as inside the tube sheet and for repair on the refining production line. Compared with manual welding repair, the repair efficiency and quality are higher. The automatic welding platform is easy to build, overcoming the problems of insufficient space such as in the tube sheet and on-site, and the narrow space. By adjusting the size of the welding positioning sleeve 600 and the position of the welding torch head 203, deep-hole welding repair welding with different hole diameters, different depths, and different thicknesses of the heat exchange tube 02 can be achieved, featuring a wide repair range. Through the argon protection technology on the back and front of the weld seam, triple protection of the weld seam is realized. By optimizing the welding parameters, the welding process is divided into multiple passes of backing, filling, and surfacing, and the weld bead is divided into eight zones to avoid the problem of concave in the uphill weld bead and improve the repair quality of the weld seam. At the same time, compared with purchasing a special hanging welding machine, the cost of building a simple portable welding equipment is lower, and the welding machine head 202 used in the process can be reinstalled for use on a conventional welding machine.

[0090] For the removal of defective welds, the traditional repair method is to use an internal grinding machine to grind and remove the weld. Although this method can remove defective welds, due to the excessive depth of the weld, the grinding is difficult, the efficiency is low, it is difficult to ensure the grinding quality, and there may even be a phenomenon of grinding the wrong position. Therefore, the quality of the weld after repair cannot be guaranteed, and the product quality is also reduced.

[0091] Therefore, this embodiment also provides a weld removal tool, combined with Figures 5 to 13 As shown, the tool includes a main shaft 1, a positioning sleeve 2, an outer base sleeve 3, and a tool assembly 4. The outer base sleeve 3 includes a fixed sleeve 32 and a sliding sleeve 33. The sliding sleeve 33 is coaxially inserted through the fixed sleeve 32 and passes out from the rear end of the fixed sleeve 32. The outer wall of the sliding sleeve 33 fits against the inner wall of the fixed sleeve 32 and is fixed to each other. The positioning sleeve 2 is coaxially installed inside the front end of the fixed sleeve 32 and passes out from the front end of the fixed sleeve 32. The positioning sleeve 2 is used to be coaxially inserted and locked in the tube hole 011, that is, when in use, the positioning sleeve 2 is fixed in the tube hole 011 and cannot move axially or rotate.

[0092] In this embodiment, a bearing 5 is provided between the fixed sleeve 32 and the positioning sleeve 2 to enable the fixed sleeve 32 to rotate relative to the positioning sleeve 2. The bearing 5 adopts a flat thrust bearing.

[0093] The main shaft 1 coaxially passes through the outer base sleeve 3 and the positioning sleeve 2, and the main shaft 1, the sliding sleeve 33, and the fixed sleeve 32 rotate together. The main shaft 1 can axially move relative to the outer base sleeve 3 within a preset range. The main shaft 1 is provided with a tool holder groove 11 along the length direction, and the tool holder groove 11 is provided with a first inclined surface 12.

[0094] The tool assembly 4 includes a tool holder base 41, a cutting blade 42, and a spring piece 43. The cutting blade 42 is fixed to the tool holder base 41. The tool holder base 41 is provided with a second inclined surface 411. Both ends of the spring piece 43 are respectively connected to the sliding sleeve 33 and the tool holder base 41. The elastic force of the spring piece 43 is relied on to keep the second inclined surface 411 in contact with the first inclined surface 12. When the main shaft 1 moves axially, the tool holder base 41 and the cutting blade 42 are driven to move radially closer to / away from the weld to be repaired.

[0095] The sliding sleeve 33 is installed between the fixed sleeve 32 in a loosenable and tightenable manner, so that the sliding sleeve 33 can be axially adjusted by a preset distance and then locked to the fixed sleeve 32 to adjust the distance between the cutting blade 42 and the positioning sleeve 2. Before use, the sliding sleeve 33 can be axially adjusted according to the distance (weld depth) between the weld 03 and the tube sheet 01. Since the spring piece 43 is connected to the sliding sleeve 33, the entire tool assembly 4 also follows the axial adjustment, that is, the distance between the cutting blade 42 and the positioning sleeve 2 (i.e., the distance between the cutting blade and the end face of the tube sheet) can be adjusted, so as to adapt to the processing of welds with different depths.

[0096] During use, the positioning sleeve 2 is fixed to the tube hole 011. The peripheral machining equipment drives the main shaft 1 axially and rotationally. When the main shaft 1 moves axially, by using the principle of the inclination angle displacement between the first inclined surface 12 and the second inclined surface 411, the tool holder base 41 and the cutting blade 42 can be driven to move radially closer to contact the weld to be repaired. The main shaft 1, the outer base sleeve 3, and the tool assembly 4 rotate together (except that the positioning sleeve 2 does not move and other parts rotate together), so that the cutting blade 42 processes the annular weld 03 and / or processes a weld groove.

[0097] Specifically, a spring sleeve 6 is fixed to the main shaft 1. A compression spring 7 is provided in the spring sleeve 6. The compression spring 7 respectively abuts against the spring sleeve 6 and the sliding sleeve 33, so that the main shaft 1 maintains the potential energy to return to the initial state. After the axial force of the external machining equipment on the main shaft 1 is removed, under the action of the compression spring 7, the main shaft 1 can be automatically driven to reset.

[0098] Specifically, a first stop step 13 is provided on the outer side of the main shaft 1, and a second stop step 31 is provided on the inner side of the sliding sleeve 33. In the initial state, the first stop step 13 axially abuts against the second stop step 31 to position the main shaft 1.

[0099] Specifically, the spring sleeve 6 and the main shaft 1 are fixed via a first metric screw 81, the tool holder base 41 and the cutting blade 42 are fixed via a second metric screw 82, the sliding sleeve 33 and the main shaft 1 are installed via a third metric screw 83 (not fully tightened, so that the main shaft 1 can move axially relative to it), the spring piece 43 and the sliding sleeve are fixed via a fourth metric screw 84, and the fixed sleeve 32 and the sliding sleeve 33 are fixed via a fifth metric screw 85.

[0100] Specifically, a guiding groove 14 arranged parallel to the axial direction is provided on the outer side of the main shaft 1, and a guide pin (i.e., the third machine screw 83) embedded in the guiding groove 14 is provided on the sliding sleeve 33, which plays a role in guiding the axial movement and limits the rotation direction to enable co-rotation.

[0101] Specifically, an annular groove 21 is provided on the outer side of the positioning sleeve 2, and a snap ring 22 is embedded in the annular groove 21, and the snap ring 22 axially positions the fixed sleeve 32.

[0102] Specifically, the tool holder 41 is provided with a locking groove 412, and the end of the elastic piece 43 is bent and embedded in the locking groove 412; the tool assembly 4 further includes a pressing block 44 and a locking screw 45, and the locking screw 45 fixes the pressing block 44 to the tool holder 41, and the pressing block 44 presses the elastic piece 43.

[0103] Specifically, a positioning convex ring 23 is provided on the outer side of the positioning sleeve 2, which is used to abut against the end face of the tube sheet 01 for positioning.

[0104] Specifically, the end of the main shaft 1 is provided with a Morse taper shank 15 for connecting with peripheral machining equipment.

[0105] Specifically, the end of the main shaft 1 is provided with a chip discharge port 16 communicating with the tool holder groove 11, which is used to discharge the waste chips cut out from the weld.

[0106] In this embodiment, the elastic piece 43 is made of spring steel sheet material, one end is bent by 100°, connected to the locking groove 412 of the tool holder 41, and the other end is bent by 9°, connected to the sliding sleeve 33.

[0107] The pressing block 44 is in the shape of a "7", with an opening on it, and is arranged on the outer side above the tool holder 41, and is fixed on the tool holder 41 through the locking screw 45 passing through the opening.

[0108] The blade 42 is made of high-speed steel, the cutting edge is in the shape of a weld groove, the length is 0.2 mm smaller than the notch of the locking groove 412, and the width is the same as the width of the tool holder 41.

[0109] The lower part of the tool holder 41 is inclined at a certain angle to form a second inclined surface 411, and the angle is the same as the angle of the first inclined surface 12 of the tool holder groove 11 of the main shaft 1. Two notches are provided above the tool holder 41, one notch is connected to the elastic piece, and the other notch is used for installing the blade. A blind hole thread is provided in the middle position between the two notches for installing the pressing block 44 and the locking screw 45. The right end of the tool holder 41 is provided with a thread for installing a machine screw to fasten the blade.

[0110] One end of the main shaft 1 is a Morse taper shank 15. A tool holder slot 11 is machined along the center line at the right end of the main shaft 1. The cross-section of the slot is a right triangle, where the hypotenuse is located inside the main shaft, the long right side is parallel to the normal of the outer circle of the main shaft, and the short right side is parallel to the normal of the right end face. The width of the slot is 0.1 mm larger than the width of the tool holder seat. The slot is inclined at a certain angle, and the inclination angle is the same as that of the tool holder seat. A thread is provided at a position slightly to the left in the middle, and the thread specification is the same as the thread in the inner hole of the spring sleeve.

[0111] The positioning sleeve 2 is provided with an annular groove 21. The outer diameter of the annular groove 21 is 0.2 mm smaller than the inner diameter of the snap ring 22. A positioning convex ring 23 is provided, and the diameter of the positioning convex ring 23 is 4 mm larger than the diameter of the pipe hole 011. The outer diameter of the cylinder of the positioning sleeve 1 inserted into the pipe hole is 0.1 mm smaller than the diameter of the pipe hole, and a 1.5×20° chamfer is provided at the end as a guide.

[0112] The fixed sleeve 32 is a hollow cylindrical shape, provided with 1 inner annular groove on 4 levels of steps. Among them, the 1st and 2nd steps are matched with the sliding sleeve. The inner diameter of the 3rd step is 4 mm smaller than the inner diameter of the bearing, and the inner diameter of the 4th step is 0.2 mm smaller than the outer diameter of the bearing. The inner annular groove is used to install the inner snap ring. 3 threaded hole through holes are evenly distributed along the center line direction in the middle of the 1st step, and the adjacent threaded holes differ by 120°.

[0113] The sliding sleeve 33 is arranged inside the fixed sleeve 32. The outer cylindrical surface is matched with the fixed sleeve 32, and the inner cylindrical surface is matched with the main shaft 1. 3 grooves are provided on the outer cylindrical surface, evenly distributed along the center line, with an interval of 120°. The first step is provided with a threaded through hole for installing a setscrew to fasten the spring piece. Another threaded through hole is provided at a position 180° different from the first threaded hole for installing a limit setscrew, and the center line of the second threaded hole is not collinear with the center line of the first threaded hole; a through square hole is opened on the right end face of the sliding sleeve 33, and a spring piece is installed in the square hole.

[0114] The sliding sleeve 33 is installed in cooperation with the main shaft 1. After adjusting the orientation, the third setscrew 83 is aligned with the guide groove 14, and the depth of the third setscrew 83 is adjusted to ensure that the sliding sleeve 33 can move within the range of the guide groove 14. The third setscrew 83 is a 2-stage screw, that is, 2 setscrews are installed to prevent the screws from loosening.

[0115] The compression spring 7 is sleeved on the main shaft 1 and enters the sliding sleeve 33. The spring sleeve 6 is installed. The threaded end of the spring sleeve 6 is threadedly connected to the main shaft 1. The other end of the spring sleeve 1 has a clearance fit with the inner hole of the sliding sleeve 32. The position of the compression spring 7 is adjusted so that the compression spring 7 is in a slightly compressed state, and the threaded hole of the spring sleeve 6 is aligned with the groove on the thread of the main shaft 1. The first setscrew 81 is installed in cooperation with the threaded hole on the spring sleeve 6 to fasten the threaded hole.

[0116] The positioning sleeve 2 is fitted and installed with the fixed sleeve 32, and the snap ring 22 is installed in the inner ring groove of the fixed sleeve 32 to axially fix the fixed sleeve 32, allowing it to rotate in the circumferential direction. The inner circle of the fixed sleeve 32 is fitted and installed with the sliding sleeve 33, and the inner hole of the positioning sleeve 2 has a clearance fit with the main shaft 1. Adjust the positions of the three threaded holes of the fixed sleeve 32 so that the threaded holes are aligned with the three grooves parallel to the axis on the sliding sleeve 33. Adjust the relative position of the fixed sleeve 32 and the sliding sleeve 33 according to the depth of the repaired weld, and then fasten it with the fifth metric screw 85.

[0117] The principle of inclined angle displacement is utilized. ① Adjust the position of the blade 42 and connect it to the machining equipment through the Morse taper shank 15. ② The positioning sleeve 2 is sleeved into the hole to be machined, and the machining equipment is used to apply pressure and push forward. After being pressed, the positioning sleeve 2 is fixed in the tube hole 011 of the tube sheet 01 (it cannot move axially or rotate), and other mechanisms can rotate, and the positioning function takes effect. ③ Continue to apply pressure to the main shaft 1, and the main shaft 1 moves to the right. The tool holder 41, the spring piece 43, the sliding sleeve 33, and the fixed sleeve 32 as a whole move to the left relative to the main shaft 1 at the same time (they do not move axially relative to the positioning sleeve 15). The spring sleeve 6 is fixed to the main shaft 1. As the main shaft 1 moves to the right, the compression spring 7 is compressed, and the blade 42 slowly extends radially towards the weld, taking a cut, and the machining depth increases with the increase of pressure until the main shaft 1 moves to the limit position. ④ After machining is completed, release the pressure on the main shaft 1. The compressed compression spring 7 drives the spring sleeve 6 and the main shaft 1 to move to the left, and at the same time, the tool holder 41 etc. reset during the recovery of the compression spring 7. Throughout the machining process, the distance from the step of the positioning sleeve 2 to the blade 42 remains unchanged, thus ensuring the position accuracy of the repaired weld.

[0118] Figure 6 Among them, the specifications of the heat exchange tubes of the welds that the repair tool can machine are: inner hole 20 - 80 mm, wall thickness 1 - 10 mm, and machining depth 30 - 300 mm. The part materials and bolts are medium carbon steel, the spring is spring steel, and the blade is cemented carbide.

[0119] During use, according to the distance between the weld and the tube sheet (weld depth), axially adjust the sliding sleeve. Since the spring piece is connected to the sliding sleeve, the entire tool assembly also follows the axial adjustment, that is, the distance between the blade and the positioning sleeve can be adjusted, so as to adapt to the machining of welds with different depths. Fix the positioning sleeve at the orifice of the deep hole weld structure. When the peripheral machining equipment drives the main shaft and the main shaft moves axially, using the principle of inclined angle displacement between the first inclined plane and the second inclined plane, it can drive the tool holder and the blade to radially approach and contact the repaired weld, and the main shaft, the outer base sleeve, and the tool assembly rotate together, so that the blade machines the weld.

[0120] Compared with the prior art, it solves the problem that deep hole welds are difficult to repair, can avoid the problems of large grinding difficulty, low efficiency, and inaccurate grinding size, ensures the size of the weld groove after repair, and thus ensures the quality of deep hole welds.

[0121] This deep-hole welding repair tool has a simple structure and is easy to operate. By adjusting the size of the positioning sleeve and the position of the sliding sleeve, the repair of deep-hole welding with different hole diameters, different depths, and different heat exchange tube thicknesses can be achieved, featuring a wide repair range. While machining and removing the problematic weld, a groove with required dimensions is machined simultaneously, realizing the function of removing the weld and machining the groove at the same time, and enabling more accurate control of the size and shape of the groove, with high precision.

[0122] In the description of the present invention, it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all of them. The components of the embodiments of the present invention usually described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0123] Therefore, the detailed description of the embodiments of the present invention provided in the drawings above is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0124] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inside", "above", "below", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0125] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "set", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Claims

1. A deep hole welding repair method for removing a bad deep hole welding seam between a tube sheet (01) and a heat exchange tube (02) and re-welding the deep hole welding seam, characterized in that: The following steps are involved: Defective weld removal step: using a weld removal tool to remove the defective circumferential weld between the tube sheet (01) and the heat exchange tube (02), and processing a groove; The welding preparation steps include: building a support mechanism (100) and a deep hole welding machine (200), wherein the deep hole welding machine (200) comprises a wire feeder (201), a welding machine head (202) and a slide module (300), wherein the welding machine head (202) comprises a welding gun head (203), a gas blowing assembly (400) and a tungsten electrode (204), wherein the tungsten electrode (204) is located at the end of the welding gun head (203), and the gas blowing assembly (400) is located beside the tungsten electrode (204) for ejecting an inert gas; and the welding machine head (202) is provided with a first servo motor for driving the welding gun head (203) to rotate; The supporting mechanism (100) uses the tube hole (011) of the tube plate (01) as a supporting point to support the entire deep hole welding machine (200); The slide module (300) is mounted on the support mechanism (100), and the wire feeder (201) and the welding head (202) are mounted on the slide module (300). The slide module (300) is used to drive the welding head (202) to move, so that the welding gun head (203) is aligned with the pipe hole (011) where the weld to be repaired is located, and the tungsten electrode (204) and the blowing assembly (400) can be manually or automatically moved forward to / backward away from the groove; the wire feeder (201) is used to provide welding wire to the welding head (202); The assembly steps include: adjusting the slide module (300) to the manual mode, sleeve the positioning sleeve (600) on the outside of the welding gun head (203) and clamp one end of the positioning sleeve (600) in the positioning hole of the welding head (202), manually moving the welding head (202) and the positioning sleeve (600) toward the pipe hole (011), inserting the other end of the positioning sleeve (600) into the clamping pipe hole (011), and realizing the coaxial positioning of the welding head (202) and the pipe hole (011); then, the welding head (202) is moved in the reverse direction, the positioning sleeve (600) is separated from the pipe hole (011), and the positioning sleeve (600) is moved away from the welding head (202); Measuring the distance between the groove and the end face of the tube sheet (01), measuring the relative position of the tungsten electrode (204) to the welding gun head (203) based on the distance, and aligning the position with the end face of the tube sheet (01) to determine that the tungsten electrode (204) is aligned with the groove; Welding steps: Towards the axis of the tube hole, the groove is divided into eight zones around the circumference, each zone covers 45° to 50°, and the total covers 370° to 400°. The area beyond 360° is the overlap zone; the zones at the upper and lower parts are flat welding zones, and the zones at the left and right sides are upslope welding zones and downslope welding zones according to the welding direction; The current used in the upslope welding area is A1, the current used in the flat welding area is A2, and the current used in the downslope welding area is A3, A3>A2>A1; The welding process of each zone includes a base laying step, a filling step and a covering step in sequence. In the base laying step, the wire feeder (201) stops feeding the welding wire and adopts a groove self-melting method; in the filling step and the covering step, the wire feeder (201) continues to feed the wire, and the slide module (300) drives the welding head (202) to move forward and backward continuously in an automatic mode, driving the tungsten electrode (204) to swing forward and backward for welding; Protection step: using inert gas to discharge the air in the shell space (05) surrounded by the cylinder (04) and the tube sheets (01) at both ends thereof, and using an oxygen detector (800) to detect the oxygen content in the shell space (05) to ensure that the oxygen content in the shell space (05) is lower than a preset value during the above welding step; and at the same time, the blowing assembly (400) sprays the inert gas; Inspection step: During the welding step, the back side forming of the weld (03) is observed through an endoscope (700) that penetrates into the shell space (05).

2. A deep hole welding repair method according to claim 1, characterized in that: The support mechanism (100) comprises a support tube (101) and a steel plate platform (102); the support tube (101) is partially inserted into a tube hole (011) of a tube plate (01); the steel plate platform (102) is horizontally fixed to a section of the support tube (101) extending outside the tube hole (011); and a deep hole welding machine (200) is installed on the steel plate platform (102).

3. A deep hole welding repair method according to claim 2, characterized in that: The slide module (300) comprises a first slide (301) and a second slide (302) which are vertically and horizontally arranged. The first slide (301) is installed on the steel plate platform (102), the second slide (302) is arranged on the first slide (301) in a front-to-back manner, and the wire feeder (201) and the welding head (202) are installed on the second slide (302); the first slide (301) is equipped with a hand wheel to drive the second slide (302) to move left and right; the second slide (302) is equipped with a second servo motor (3021) to automatically drive the welding head (202) to move forward and backward.

4. A deep hole welding repair method according to claim 3, characterized in that: A leveling mechanism (500) is provided between the first slide (301) and the steel plate platform (102) to adjust the flatness of the first slide (301) and its height relative to the steel plate platform (102).

5. A deep hole welding repair method according to claim 4, characterized in that: The leveling mechanism (500) includes a plurality of leveling screws that pass through the steel plate platform (102) and press upward against the first slide platform (301).

6. A deep hole welding repair method according to claim 1, characterized in that: The blowing assembly (400) comprises a nozzle (401) and a microporous aeration head (402). The tungsten pole (204) is arranged at the end of the microporous aeration head (402). The nozzle (401) is located beside the tungsten pole (204). The nozzle (401) and the microporous aeration head (402) are both connected to an external inert gas supply mechanism.

7. A deep hole welding repair method according to claim 1, characterized in that: There is a clearance fit between the positioning sleeve (600) and the positioning hole of the welding head (202), and the clearance is 0.02-0.05 mm; there is a clearance fit between the positioning sleeve (600) and the pipe hole (011), and the clearance is 0.02-0.05 mm.

8. A deep hole welding repair method according to claim 1, characterized in that: In the welding steps, in the counterclockwise direction, the upslope welding area is the 5-1 o'clock area, the flat welding area is the 1-11 o'clock and 7-5 o'clock areas, and the downslope welding area is the 11-7 o'clock area.

9. A deep hole welding repair method according to claim 1, characterized in that: In the step of removing the defective weld, the weld removal tool used comprises a main shaft (1), a positioning sleeve (2), an outer base sleeve (3) and a tool assembly (4), the outer base sleeve (3) comprises a fixed sleeve (32) and a sliding sleeve (33), the sliding sleeve (33) is coaxially inserted into the fixed sleeve (32), and the positioning sleeve (2) is coaxially installed at the end of the fixed sleeve (32) for being coaxially inserted and locked in the peripheral opening; A bearing (5) is arranged between the fixing sleeve (32) and the positioning sleeve (2) so that the two can rotate relative to each other; The main shaft (1) coaxially passes through the outer base sleeve (3) and the positioning sleeve (2), and the main shaft (1), the sliding sleeve (33) and the fixed sleeve (32) rotate together, and the main shaft (1) can move axially within a preset range relative to the outer base sleeve (3); the main shaft (1) is provided with a tool clamping groove (11) along the length direction, and the tool clamping groove (11) is provided with a first inclined surface (12); The tool assembly (4) comprises a tool holder seat (41), a blade (42) and a spring sheet (43); the blade (42) is fixed to the tool holder seat (41); the tool holder seat (41) is provided with a second inclined surface (411); two ends of the spring sheet (43) are respectively connected to the sliding sleeve (33) and the tool holder seat (41) so that the second inclined surface (411) remains in contact with the first inclined surface (12); the spindle (1) moves axially to drive the tool holder seat (41) and the blade (42) to move radially toward / away from the weld to be repaired; The sliding sleeve (33) and the fixed sleeve (32) can be loosely mounted so that the sliding sleeve (33) can be adjusted along the axial direction by a preset distance and then locked to the fixed sleeve (32) to adjust the distance between the blade (42) and the positioning sleeve (2).

10. A deep hole welding repair method according to claim 9, characterized in that: A spring sleeve (6) is fixed to the main shaft (1), a compression spring (7) is arranged in the spring sleeve (6), and the compression spring (7) respectively presses against the spring sleeve (6) and the sliding sleeve (33) to keep the main shaft (1) in a potential energy of returning to an initial state.

11. A deep hole welding repair method according to claim 10, characterized in that: A first stop step (13) is arranged on the outer side of the main shaft (1), and a second stop step (31) is arranged on the inner side of the sliding sleeve (33). In an initial state, the first stop step (13) axially abuts against the second stop step (31).

12. A deep hole welding repair method according to claim 10, characterized in that: The spring sleeve (6) and the main shaft (1), the tool holder (41) and the blade (42), the sliding sleeve (33) and the main shaft (1), the spring sheet (43) and the sliding sleeve (33), and the fixed sleeve (32) and the sliding sleeve (33) are respectively installed via machine screws.

13. A deep hole welding repair method according to claim 9, characterized in that: The outer side of the main shaft (1) is provided with a guide groove (14) arranged along the axial direction, and the sliding sleeve (33) is provided with a guide pin embedded in the guide groove (14).

14. A deep hole welding repair method according to claim 9, characterized in that: An annular groove (21) is arranged on the outer side of the positioning sleeve (2), a retaining spring (22) is embedded in the annular groove (21), and the retaining spring (22) limits the axial position of the fixing sleeve (32).

15. The deep hole welding repair method according to claim 9, characterized in that: The tool holder seat (41) is provided with a locking groove (412), and the end of the spring sheet (43) is bent and embedded in the locking groove (412); the tool assembly (4) also includes a clamping block (44) and a locking screw (45), and the locking screw (45) fixes the clamping block (44) to the tool holder seat (41), and the clamping block (44) presses the spring sheet (43).

16. A deep hole welding repair method according to claim 9, characterized in that: A positioning convex ring (23) is arranged on the outer side of the positioning sleeve (2).

17. A deep hole welding repair method according to claim 9, characterized in that: A Morse taper shank (15) is provided at the end of the main shaft (1).

18. The deep hole welding repair method according to claim 9, characterized in that: The end of the main shaft (1) is provided with a chip removal opening (16) connected to the tool holder groove (11).

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