A heat distortion resistant welding system and process for structural ribs of a ship plate

Abstract

The application discloses a kind of structural rib heat deformation welding systems of ship plate body, including horizontal guide rail above workpiece support platform, and the double-path welding device that can translate along the length direction of horizontal guide rail;Double-path welding device includes left-right symmetrical first rolling type welding unit a and second rolling type welding unit b;First rolling type welding unit a and second rolling type welding unit b all include connecting arm, rudder, lifter, support, rolling wheel and welder;To the purpose of accurate water-cooled plate body welding site, avoid the thermal deformation of plate body in continuous welding process due to rapid heating.

Description

Technical Field

[0001] This invention belongs to the field of plate welding. Background Technology

[0002] To improve the load-bearing capacity, structural strength, and deformation resistance of curved structural plates in ship structures, at least two curved structural ribs need to be welded to the concave surface of the curved structural plate, such as... Figure 1 As shown, during the welding process, the arc-shaped plate is prone to thermal deformation due to localized heating, which in turn causes changes in the shape of the arc-shaped structural plate. This results in the arc-shaped plate with this reinforced structure not being able to be installed seamlessly during subsequent installation. Therefore, it is necessary to design a welding process and device to resist thermal deformation of this arc-shaped structural plate. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the prior art, the present invention provides a heat-resistant welding system and process for the structural ribs of ship plates to suppress heat deformation of the plates during the welding process.

[0004] Technical solution: To achieve the above objectives, the present invention provides a structural rib anti-thermal deformation welding system for ship hulls, comprising a horizontal guide rail above a workpiece support platform and a dual-path welding device capable of translating along the length of the horizontal guide rail.

[0005] The dual-path welding device includes a first roll welding unit a and a second roll welding unit b, which are symmetrically arranged on the left and right sides; both the first roll welding unit a and the second roll welding unit b include a connecting arm, a servo motor, a lifter, a bracket, a roll roller, and a welding machine.

[0006] The servo motor is fixed at the lower end of the connecting arm, with the servo motor shaft facing vertically downwards. The servo motor shaft is fixedly connected to the lifting device via the synchronous arm. The end of the lifting rod of the lifting device is fixedly connected to the bracket. The rolling wheel is rotatably mounted on the bracket, and the welding machine is fixed on the bracket.

[0007] The upper ends of the connecting arms of the first roll welding unit a and the second roll welding unit b are both fixed on the slider; the slider moves along the horizontal guide rail.

[0008] Furthermore, the workpiece to be welded includes an arc panel and at least two arc-shaped structural ribs. The two arc-shaped structural ribs fit against the concave arc surface of the arc panel along the arc contour, and the two ends of the arc-shaped structural ribs are fixed to the arc panel by spot welding. The side of the two arc-shaped structural ribs that are close to each other forms two first arc-shaped joints a to be welded, and the side of the two arc-shaped structural ribs that are far apart from each other forms two second arc-shaped joints b to be welded. The arc panel is placed on the upper surface of the workpiece support platform with the convex arc surface facing down. The rolling rollers of the first rolling welding unit a and the second rolling welding unit b are both tangent to the concave surface of the arc panel.

[0009] Furthermore, under the combined downward rolling action of the two rolling rollers, the convex arc surface of the arc panel at the rolling position is tangent to the workpiece support platform and forms a line contact, forming a straight contact seam at the tangent point between the arc panel and the workpiece support platform.

[0010] Furthermore, when the two rolling rollers press down tightly on the center of the arc panel, a front raised opening a is formed between the front half of the arc panel and the surface of the workpiece support platform, and a rear raised opening b is formed between the rear half of the arc panel and the surface of the workpiece support platform.

[0011] Furthermore, the front and rear ends of the workpiece support platform are respectively equipped with a first water spray nozzle and a second water spray nozzle arranged opposite to each other. The nozzle of the first water spray nozzle is horizontally facing the forward upturned opening a, and the nozzle of the second water spray nozzle is horizontally facing the rear upturned opening b. The jet sprayed from the first water spray nozzle is sprayed into the forward upturned opening a and finally impacts the middle of the straight contact seam in the forward upturned opening a. The jet sprayed from the second water spray nozzle is sprayed into the rear upturned opening b and finally impacts the middle of the straight contact seam in the rear upturned opening b.

[0012] Furthermore, the surface of the workpiece support platform is provided with a first drainage groove a and a second drainage groove b in parallel; both the first drainage groove a and the second drainage groove b are connected in the front-to-back direction; from a top view, two arc-shaped structural ribs are projected into the first drainage groove a and the second drainage groove b respectively.

[0013] Furthermore, the dual-path welding device includes a first state and a second state;

[0014] In the first state: the rolling roller of the first rolling welding unit a and the rolling roller of the second rolling welding unit b are respectively located on the side where the two arc-shaped structural ribs are close to each other; and the welding gun end of the welding machine of the first rolling welding unit a and the welding gun end of the welding machine of the second rolling welding unit b respectively point to the two second arc-shaped joints b to be welded.

[0015] Based on the "first state", the lifting rods of the first roll welding unit a and the second roll welding unit b retract upwards synchronously. Then, the servo shafts on the first roll welding unit a and the second roll welding unit b rotate by °. Finally, the lifting rods of the first roll welding unit a and the second roll welding unit b extend downwards, so that the rolling wheels of the first roll welding unit a and the second roll welding unit b are tangent to the concave surface of the arc panel again, thus entering the "second state".

[0016] In the second state: the rolling rollers of the first rolling welding unit a and the second rolling welding unit b are respectively located on the side of the two arc-shaped structural ribs that are far apart from each other; and the welding gun ends of the welding machine of the first rolling welding unit a and the welding gun ends of the welding machine of the second rolling welding unit b are respectively pointing to the two first arc-shaped joints a to be welded.

[0017] Furthermore, the welding process for the heat-resistant deformation welding system of the structural ribs of the ship's hull:

[0018] This ensures that at any point during the continuous spraying process along the welding path, the back side of the localized area of ​​the arc panel subjected to high-temperature welding by the welding gun is always precisely and continuously rinsed by cooling water.

[0019] Beneficial effects: During the slow and continuous spraying welding process along the path of the arc-shaped joint to be welded, the positions of the "two intersection points" always change synchronously with the welding gun. This ensures that at any moment during the slow and continuous spraying welding process along the path of the arc-shaped joint, the back side of the local area of ​​the arc panel being welded by the high temperature of the welding gun is always precisely and continuously scoured by cooling water. This achieves the purpose of precisely water-cooling the welded part of the plate and avoids thermal deformation of the plate due to excessively rapid heating during continuous welding. Attached Figure Description

[0020] Appendix Figure 1 This is a schematic diagram showing the arc-shaped structural plate before and after welding.

[0021] Appendix Figure 2 This is a schematic diagram of the overall device;

[0022] Appendix Figure 3 For the appendix Figure 2 Sectional view along direction A;

[0023] Appendix Figure 4 This is an exploded view of the device;

[0024] Appendix Figure 5 This is a diagram illustrating the "first state" and the "second state". Detailed Implementation

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] As attached Figures 1 to 5 The above describes a welding system for heat-resistant structural ribs of a ship hull. The workpiece to be welded includes an arc panel 3 and at least two arc-shaped structural ribs 21. The two arc-shaped structural ribs 21 are attached to the concave arc surface of the arc panel 3 along the arc contour. Before welding, the two ends of the arc-shaped structural ribs 21 are fixed to the arc panel 3 by spot welding. Two first arc-shaped joints 20a are formed on the side where the two arc-shaped structural ribs 21 are close to each other, and two second arc-shaped joints 20b are formed on the side where the two arc-shaped structural ribs 21 are far apart from each other.

[0027] like Figure 5As shown, a horizontal workpiece support platform 16 is provided in the center of the welding base 6, and water storage tanks 14 are distributed around the workpiece support platform 16. Cooling water is stored in the water storage tanks 14; the convex arc surface of the arc panel 3 is placed on the upper surface of the workpiece support platform 16 with its convex arc surface facing down.

[0028] like Figure 1 The welding apparatus includes a horizontal guide rail 1 above the workpiece support platform 16, and a dual-path welding device 4 capable of translating along the length of the horizontal guide rail 1; such as Figure 3 The dual-path welding device 4 includes a first roll welding unit 10a and a second roll welding unit 10b with a left-right symmetrical structure; as shown... Figure 5 The first roll welding unit 10a and the second roll welding unit 10b both include a connecting arm 13, a servo motor 41, a lifter 24, a bracket 26, a roll roller 29, and a welding machine 27; the welding machine 27 in this scheme is a laser cladding welding machine.

[0029] like Figure 5 Servo motor 41 is fixed to the lower end of connecting arm 13. The servo shaft 22 of servo motor 41 is vertically downward and is fixedly connected to lifter 24 through synchronous arm 23. The end of lifting rod 25 of lifter 24 is fixedly connected to bracket 26. Roller roller 29 is rotatably mounted on bracket 26 through bearing. Welding machine 27 is fixed on bracket 26. The upper ends of connecting arms 13 of the first roll welding unit 10a and the second roll welding unit 10b are both fixed to slider 2. Slider 2 moves along guide rail 1 in horizontal guide rail. Roller roller 29 of the first roll welding unit 10a and the second roll welding unit 10b are both tangent to the concave surface of arc panel 3.

[0030] The dual-path welding device 4 includes a first state and a second state, such as... Figure 5 As shown:

[0031] In the first state: the rolling roller 29 of the first rolling welding unit 10a and the rolling roller 29 of the second rolling welding unit 10b are respectively located on the side where the two arc-shaped structural ribs 21 are close to each other; and the end of the welding gun 28 of the welding machine 27 of the first rolling welding unit 10a and the end of the welding gun 28 of the welding machine 27 of the second rolling welding unit 10b respectively point to the two second arc-shaped joints 20b to be welded.

[0032] Based on the "first state", the lifting rods 25 of the first rolling welding unit 10a and the second rolling welding unit 10b are simultaneously retracted upwards. Then, the servo shafts 22 on the first rolling welding unit 10a and the second rolling welding unit 10b are rotated 180°. Finally, the lifting rods 25 of the first rolling welding unit 10a and the second rolling welding unit 10b are extended downwards, so that the rolling rollers 29 of the first rolling welding unit 10a and the second rolling welding unit 10b are tangent to the concave surface of the arc panel 3 again, and the "second state" is entered. In the second state: the rolling rollers 29 of the first rolling welding unit 10a and the second rolling welding unit 10b are respectively limited to the side of the two arc-shaped structural ribs 21 that are far apart from each other; and the ends of the welding guns 28 of the welding machine 27 of the first rolling welding unit 10a and the second rolling welding unit 10b are respectively pointing to the two first arc-shaped joints 20a to be welded.

[0033] like Figure 3 As shown, under the combined downward rolling action of the two rolling rollers 29, the convex arc surface of the arc panel 3 at the rolling position is tangent to the workpiece support platform 16 and forms a line contact. A straight contact seam 11 is formed at the tangent point between the arc panel 3 and the workpiece support platform 16.

[0034] like Figure 2 As shown, when the two rolling rollers 29 roll down tightly against the middle of the arc panel 3, a front raised opening 7a is formed between the front half of the arc panel 3 and the surface of the workpiece support platform 16, and a rear raised opening 7b is formed between the rear half of the arc panel 3 and the surface of the workpiece support platform 16. The front and rear ends of the workpiece support platform 16 are respectively equipped with a first water spray nozzle and a second water spray nozzle arranged opposite to each other. The nozzle of the first water spray nozzle is horizontally oriented towards the front raised opening 7a, and the nozzle of the second water spray nozzle is horizontally oriented towards the rear raised opening 7b. The jet sprayed from the first water spray nozzle is sprayed into the front raised opening 7a and finally impacts the middle of the straight contact seam 11 in the front raised opening 7a. The jet sprayed from the second water spray nozzle is sprayed into the rear raised opening 7b and finally impacts the middle of the straight contact seam 11 in the rear raised opening 7b.

[0035] It also includes a first water pump 8a and a second water pump 8b, the outlet ends of the first water pump 8a and the second water pump 8b are respectively connected to the inlet ends of the first water nozzle and the second water nozzle; the first inlet pipe 9a of the first water pump 8a and the second inlet pipe 9b of the second water pump 8b are respectively connected to the cooling water in the water storage tank 14.

[0036] The surface of the workpiece support platform 16 is provided with a first drainage groove 15a and a second drainage groove 15b arranged side by side; the first drainage groove 15a and the second drainage groove 15b are both connected in the front-to-back direction; in the top view, two arc-shaped structural ribs 21 are projected into the first drainage groove 15a and the second drainage groove 15b respectively.

[0037] Working method: Welding process in the first state:

[0038] Step 1: Fit the two arc-shaped structural ribs 21 to be welded along the arc contour to the concave arc surface of the arc panel 3, and fix the two ends of the arc-shaped structural ribs 21 to the arc panel 3 by spot welding. The two arc-shaped structural ribs 21 on the side that are close to each other form two first arc-shaped joints 20a to be welded, and the two arc-shaped structural ribs 21 on the side that are far apart from each other form two second arc-shaped joints 20b to be welded.

[0039] Step 2: Place the arc panel 3 with the convex arc surface facing down on the upper surface of the workpiece support platform 16, and put the dual-path welding device 4 into the "first state". In the "first state", the rolling roller 29 of the first rolling welding unit 10a and the rolling roller 29 of the second rolling welding unit 10b are respectively limited to the side where the two arc-shaped structural ribs 21 are close to each other, thereby achieving the positioning of the arc panel 3 in the left and right directions; and the ends of the welding guns 28 of the welding machine 27 of the first rolling welding unit 10a and the welding guns 28 of the welding machine 27 of the second rolling welding unit 10b respectively point to the two second arc-shaped joints 20b to be welded.

[0040] In the "initial state", the two rolling rollers 29 together roll down tightly on the middle part of the arc panel 3, and a front upturned opening 7a is formed between the front half of the arc panel 3 and the surface of the workpiece support platform 16, and a rear upturned opening 7b is formed between the rear half of the arc panel 3 and the surface of the workpiece support platform 16.

[0041] Step 3: Simultaneously start both welding machines 27, so that the two welding guns 28 respectively perform spray welding on the middle part of the two second arc-shaped joints 20b to be welded, thereby achieving partial welding of the middle part of the two second arc-shaped joints 20b to be welded; at the same time, the first water nozzle sprays out a jet of cooling water, which sprays into the forward-curved opening 7a and finally impacts the middle part of the straight contact seam 11 in the forward-curved opening 7a. After impacting the middle part of the straight contact seam 11 in the forward-curved opening 7a, the jet splits along the left and right directions of the straight contact seam 11. The cooling water split along the left and right directions of the straight contact seam 11 flows continuously into the first drainage tank 15a and the second drainage tank 15b, and then flows continuously into the first drainage tank 15a and the second drainage tank 15b, respectively. Cooling water from water tank 15a and the second drainage tank 15b flows back into the water storage tank 14 in the front-to-back direction. This process ensures that fresh cooling water continuously flows into and washes the two intersection points formed by the extension lines of the straight contact seam 11, the extension lines of the first drainage tank 15a, and the extension lines of the second drainage tank 15b. At this time, the back of the two local areas of the arc panel 3 that are subjected to high-temperature welding by the two welding guns 28 are located at the two intersection points. Therefore, the back of the two local areas of the arc panel 3 subjected to high-temperature welding by the two welding guns 28 are precisely and continuously washed by cooling water, thereby achieving the purpose of precisely water-cooling the welded parts of the plate and avoiding thermal deformation of the welded parts of the plate due to excessive heating.

[0042] Step four: Based on the operation in "Step three", control the slider 2 to slowly move backward along the horizontal guide rail 1, so that the two rolling rollers 29 roll backward together on the arc panel 3, causing the front half of the arc panel 3 to gradually tilt upward and the rear half to gradually press downward, so that the two welding guns 28 slowly and continuously spray weld backward along the path of the two second arc joints 20b to be welded, until the rear half of the two second arc joints 20b to be welded is uniformly welded; at the same time, the two welding guns 28 move backward along the path of the two second arc joints 20b to be welded. During the subsequent slow and continuous spray welding process, the positions of the "two intersection points" always change synchronously with the two welding guns 28, so that at any moment during the slow and continuous spray welding process of the two welding guns 28 along the paths of the two second arc joints 20b to be welded, the back of the two local areas of the arc panel 3 that are subjected to high-temperature welding by the two welding guns 28 are always in a state of being precisely and continuously flushed by cooling water, thereby achieving the purpose of precisely water cooling the welding parts of the plate body and avoiding thermal deformation of the plate body due to excessive heating during the continuous welding process.

[0043] Step 5: Pause the welding machine 27 and the first water spray nozzle, and control the slider 2 to slowly move forward along the horizontal guide rail 1 until it returns to the "initial state" in Step 2. At this time, the two rolling rollers 29 continue to roll down tightly on the middle of the arc panel 3.

[0044] Step six: The second spray nozzle sprays a jet of cooling water. The jet of cooling water sprayed from the second spray nozzle is directed into the rear upturned opening 7b and finally impacts the middle of the straight contact seam 11 in the rear upturned opening 7b. After impacting the middle of the straight contact seam 11 in the rear upturned opening 7b, the jet splits along the left and right directions of the straight contact seam 11. The cooling water split along the left and right directions of the straight contact seam 11 flows continuously into the first drainage tank 15a and the second drainage tank 15b. Subsequently, the cooling water flowing into the first drainage tank 15a and the second drainage tank 15b flows back into the water storage tank 14 in the front and back directions. The above process ensures that fresh cooling water continuously flows in and washes the "two intersection points" formed by the extension line of the straight contact seam 11, the extension line of the first drainage tank 15a, and the extension line of the second drainage tank 15b.

[0045] Meanwhile, the control slider 2 moves slowly forward along the horizontal guide rail 1, so that the two rolling rollers 29 roll forward together to press the arc panel 3, so that the front half of the arc panel 3 is gradually pressed down and the rear half is gradually raised, so that the two welding guns 28 slowly and continuously spray welding forward along the path of the two second arc joints 20b to be welded, until the front half of the two second arc joints 20b to be welded is uniformly welded; at the same time, during the process of the two welding guns 28 slowly and continuously spray welding forward along the path of the two second arc joints 20b to be welded, the position of the "two intersection points" always changes synchronously with the two welding guns 28, so that at any moment during the process of the two welding guns 28 slowly and continuously spray welding forward along the path of the two second arc joints 20b to be welded, the back of the two local areas of the arc panel 3 that are subjected to high temperature welding by the two welding guns 28 is always in a state of precise and continuous rinsing by cooling water, thereby achieving the purpose of precisely water cooling the welding part of the plate and avoiding thermal deformation of the plate due to excessive heating during continuous welding.

[0046] At this point, the two second arc-shaped joints 20b to be welded were completely welded;

[0047] Step six: Pause the welding machine 27 and the second water spray nozzle, and control the slider 2 to slowly move backward along the horizontal guide rail 1 until it returns to the "initial state" in step two. At this time, the two rolling rollers 29 continue to roll down tightly on the middle of the arc panel 3.

[0048] Step 7: The lifting rods 25 of the first roll welding unit 10a and the second roll welding unit 10b retract upwards synchronously. Then, the servo shafts 22 on the first roll welding unit 10a and the second roll welding unit 10b rotate 180°. Finally, the lifting rods 25 of the first roll welding unit 10a and the second roll welding unit 10b extend downwards, so that the rolling rollers 29 of the first roll welding unit 10a and the second roll welding unit 10b are tangent to the concave surface of the arc panel 3 again and press downwards, entering the "second state". Then, referring to the process of "steps 2" to "steps 5", the process of welding the two first arc joints 20a is completed.

[0049] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A heat-resistant welding system for structural ribs of a ship's hull, characterized in that: Includes a horizontal guide rail (1) above the workpiece support platform (16), and a dual-path welding device (4) that can translate along the length of the horizontal guide rail (1); The dual-path welding device (4) includes a first rolling welding unit (10a) and a second rolling welding unit (10b) that are symmetrically arranged on the left and right sides; both the first rolling welding unit (10a) and the second rolling welding unit (10b) include a connecting arm (13), a servo motor (41), a lifter (24), a bracket (26), a rolling wheel (29) and a welding machine (27); The servo motor (41) is fixed at the lower end of the connecting arm (13). The servo motor shaft (22) of the servo motor (41) is vertically downward, and the servo motor shaft (22) is fixedly connected to the lifter (24) through the synchronous arm (23). The end of the lifting rod (25) of the lifter (24) is fixedly connected to the bracket (26). The rolling wheel (29) is rotatably mounted on the bracket (26). The welding machine (27) is fixed on the bracket (26). The upper ends of the connecting arms (13) of the first roll welding unit (10a) and the second roll welding unit (10b) are both fixed on the slider (2); the slider (2) moves along the horizontal guide rail (1); The workpiece to be welded includes an arc panel (3) and at least two arc-shaped structural ribs (21). The two arc-shaped structural ribs (21) fit along the arc contour of the concave arc surface of the arc panel (3), and the two ends of the arc-shaped structural ribs (21) are fixed to the arc panel (3) by spot welding. The two arc-shaped structural ribs (21) form two first arc-shaped joints (20a) to be welded on the side that are close to each other, and form two second arc-shaped joints (20b) to be welded on the side that are far apart from each other. The arc panel (3) is placed on the upper surface of the workpiece support platform (16) with the convex arc surface facing down. The rolling rollers (29) of the first rolling welding unit (10a) and the second rolling welding unit (10b) are both tangent to the concave surface of the arc panel (3). Under the combined downward rolling action of the two rolling rollers (29), the convex arc surface of the arc panel (3) at the rolling position is tangent to the workpiece support platform (16) and forms a line contact. A straight contact seam (11) is formed at the tangent point between the arc panel (3) and the workpiece support platform (16). When the two rolling rollers (29) roll down tightly on the middle of the arc panel (3), a front upturned opening (7a) is formed between the front half of the arc panel (3) and the surface of the workpiece support platform (16), and a rear upturned opening (7b) is formed between the rear half of the arc panel (3) and the surface of the workpiece support platform (16). The workpiece support platform (16) is equipped with a first water spray nozzle and a second water spray nozzle arranged opposite to each other at its front and rear ends. The nozzle of the first water spray nozzle is horizontally oriented towards the front upturned opening (7a), and the nozzle of the second water spray nozzle is horizontally oriented towards the rear upturned opening (7b). The jet sprayed from the first water spray nozzle is sprayed into the front upturned opening (7a) and finally impacts the middle part of the straight contact seam (11) in the front upturned opening (7a). The jet sprayed from the second water spray nozzle is sprayed into the rear upturned opening (7b) and finally impacts the middle part of the straight contact seam (11) in the rear upturned opening (7b). The surface of the workpiece support platform (16) is provided with a first drainage groove (15a) and a second drainage groove (15b) arranged side by side; the first drainage groove (15a) and the second drainage groove (15b) are both connected in the front-to-back direction; in the top view, two arc-shaped structural ribs (21) are projected into the first drainage groove (15a) and the second drainage groove (15b) respectively.

2. The heat-resistant welding system for structural ribs of a ship hull according to claim 1, characterized in that: The dual-path welding device (4) includes a first state and a second state; In the first state: the rolling roller (29) of the first rolling welding unit (10a) and the rolling roller (29) of the second rolling welding unit (10b) are respectively located on the side where the two arc-shaped structural ribs (21) are close to each other; and the end of the welding gun (28) of the welding machine (27) of the first rolling welding unit (10a) and the end of the welding gun (28) of the welding machine (27) of the second rolling welding unit (10b) respectively point to the two second arc-shaped joints (20b) to be welded; Based on the "first state", the lifting rods (25) of the first rolling welding unit (10a) and the second rolling welding unit (10b) retract upwards synchronously. Then, the servo shafts (22) on the first rolling welding unit (10a) and the second rolling welding unit (10b) rotate 180°. Finally, the lifting rods (25) of the first rolling welding unit (10a) and the second rolling welding unit (10b) extend downwards. When the rolling rollers (29) of the first rolling welding unit (10a) and the second rolling welding unit (10b) are tangent to the concave surface of the arc panel (3) again, the "second state" is entered. In the second state: the rolling roller (29) of the first rolling welding unit (10a) and the rolling roller (29) of the second rolling welding unit (10b) are respectively located on the side of the two arc-shaped structural ribs (21) that are far apart from each other; and the end of the welding gun (28) of the welding machine (27) of the first rolling welding unit (10a) and the end of the welding gun (28) of the welding machine (27) of the second rolling welding unit (10b) respectively point to the two first arc-shaped joints (20a) to be welded.

3. The welding process of the heat-resistant deformation welding system for structural ribs of a ship hull according to claim 2, characterized in that: At any point during the continuous spraying process along the welding path, the back side of the local area of ​​the arc panel (3) subjected to high-temperature welding by the welding gun (28) is always precisely and continuously rinsed by cooling water.

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