Auxiliary device for welding large H-shaped supporting beam for steam generator and welding method

Abstract

The invention discloses an auxiliary device for welding a large H-shaped supporting beam for a steam generator and a welding method.The device comprises a plurality of sets of supporting units, two wing plates can be supported from the inner side to the outer side, the wing plates are prevented from deforming during welding, a medium-frequency heating rope is fixed to the wing plates through a heating rope fixing piece, and the welding efficiency is improved. In addition, at least two supporting rings are arranged on the outer portion of the supporting unit and used for being matched with a rolling wheel frame to rapidly turn over the large H-shaped supporting beam, and therefore a welding seam can be conveniently welded at a flat welding position.

Description

Technical Field

[0001] The invention relates to the field of nuclear power manufacturing, in particular to the welding and manufacturing of a steam generator support assembly of a main equipment of a nuclear island of a nuclear power plant, and in particular to an auxiliary device and a welding method for welding a large H-shaped support beam for a steam generator. Background Art

[0002] After the steam generator of the nuclear island of a nuclear power plant is installed in the containment, it needs to be connected and fixed to the containment foundation through a variety of support components. The support components include welded H-shaped support beams of various specifications as the main load-bearing parts. The H-shaped support beam is composed of an intermediate web and upper and lower wing plates. The weld structure formed by the wing plate and the web is a T-shaped weld. There are grooves on both sides of the web. Each side of the groove must be well and evenly welded and filled, so that the wing plate and the web are integrated.

[0003] During the entire welding process, the area around the weld needs to be heated at 150-210°C, and 100% ultrasonic non-destructive testing is required after welding; the final appearance size requirements of the H-shaped support beam are: the parallelism of the outer sides of the upper and lower wing panels, the verticality of the wing panels and the web, and the flatness of the wing panels shall not be greater than 1.5mm.

[0004] Since the large H-shaped support beams used for steam generator support are large in size, thick in plate and long in length, the welding filling volume of the wing plate and the web plate is large and there are many welding positions. The following difficulties will arise during the welding process:

[0005] 1. The web groove filling is prone to shrinkage deformation, which causes the angle between the wing plate and the web plate to decrease, resulting in verticality deviation. In addition, the thermal shrinkage of the T-shaped weld is prone to bending the wing plate, resulting in its flatness deviation. Figure 4 As shown;

[0006] 2. To ensure uniform filling of molten metal in the groove during welding, it is usually advisable to weld in a flat position with the groove facing upward. At the same time, a small amount of filling and alternating welding should be adopted on both sides of the weld, which has a better effect on stress balance in the welds on both sides and can further suppress welding deformation. However, the H-shaped support beam is heavy and needs to be frequently lifted and turned with the assistance of a crane;

[0007] 3. For the heating of the weld seam of the parts to be heated, open flame heating and electromagnetic heating are usually used. Open flame heating is more flexible in terms of heating position, but the temperature is uneven and difficult to maintain stability. At the same time, there is a certain risk during the welding process; electromagnetic heating can be heated by laying a medium-frequency heating rope on the outside of the wing plate. This method is stable and safe, but the heating rope must always be fixed to the steel section. From the above welding method, it is difficult to fix the medium-frequency heating rope 7.

[0008] Large H-shaped support beams, as the pressure-bearing support components of the main equipment of the nuclear island, have strict requirements on welding quality and external dimensions. Usually, in order to ensure the final size, the manufacturer will increase a certain processing allowance on the specifications and thickness of the wing plate and web to compensate for the welding deformation. After the weld quality inspection is qualified, the overall mechanical processing is carried out according to the dimensional requirements to meet the final size. However, this method is costly, time-consuming and difficult to process.

[0009] In summary, it is urgent to study an auxiliary device with functions such as efficient anti-deformation, heating and rotary welding in the welding process of large H-shaped support beams to ensure the welding quality and various dimensions of the large H-shaped support beams. Summary of the invention

[0010] In order to overcome the above-mentioned problems, the inventors have conducted intensive research and designed an auxiliary device and welding method for welding a large H-shaped support beam for a steam generator. The device includes multiple groups of support units, which can support two wing panels from the inside to the outside to prevent the wing panels from deforming during welding. The medium-frequency heating rope is fixed to the wing panel by arranging a heating rope fixing piece, so that the medium-frequency heating rope rolls with the wing panel and continues to heat, ensuring that the temperature during welding meets the design requirements. In addition, at least two support rings are arranged outside the support unit to cooperate with the roller frame to quickly flip the large H-shaped support beam to facilitate the welding of the weld in the flat welding position; thereby completing the present invention.

[0011] Specifically, the object of the present invention is to provide an auxiliary device for welding a large H-shaped support beam for a steam generator, wherein the large H-shaped support beam 6 comprises a wing plate and a web plate 63, wherein the wing plate comprises an upper wing plate 61 and a lower wing plate 62 arranged parallel to each other, wherein one end of the web plate 63 is fixed to the middle of the upper wing plate 61, and the other end of the web plate 63 is fixed to the middle of the lower wing plate 62, and the web plate 63 is perpendicular to the upper wing plate 61 and the lower wing plate 62;

[0012] The auxiliary device comprises a plurality of supporting units, wherein the supporting units comprise two positioning blocks 1 and a bidirectional screw sleeve 2 connecting the two positioning blocks;

[0013] In the support unit, one positioning block 1 is close to the upper wing plate 61, and the other positioning block 1 is close to the lower wing plate 62. The length of the support unit is adjusted by screwing the bidirectional screw sleeve 2, so that the support unit supports the upper wing plate 61 and the lower wing plate 62 from the inside to the outside to prevent welding deformation when welding the large H-shaped support beam.

[0014] A slot 11 is provided on the positioning block 1, and the slot 11 consists of a bottom end face 111 and a side end face 112 which are perpendicular to each other. When the positioning block 1 is pressed against the wing plate, the bottom end face 111 abuts against the bottom surface of the wing plate, and the side end face 112 abuts against the side surface of the wing plate.

[0015] Wherein, a top support stud 12 is arranged on the positioning block 1, and a T-shaped thread is opened on the top support stud 12;

[0016] The two top support studs 12 in the support unit have different directions of rotation of the T-shaped threads, one is left-handed and the other is right-handed;

[0017] One end of the bidirectional screw sleeve 2 is provided with a right-handed threaded hole 21, and the other end is provided with a left-handed threaded hole 22. A pre-tightening hole 23 is opened in the middle of the bidirectional screw sleeve 2. The bidirectional screw sleeve 2 is screwed through the pre-tightening hole 23 to adjust the length of the support unit.

[0018] The auxiliary device further comprises a plurality of heating rope fixing members 3; the heating rope fixing members 3 are arranged on the outer sides of the upper wing plate 61 and the lower wing plate 62.

[0019] The heating rope fixing member 3 is fixedly mounted on the positioning block 1;

[0020] The medium frequency heating rope 7 is fixed to the outer sides of the upper wing plate 61 and the lower wing plate 62 through the heating rope fixing part 3, and then the upper wing plate 61 and the lower wing plate 62 are heated by the medium frequency heating rope 7, so that the temperature around the weld is controlled at 150-210°C during welding.

[0021] The heating rope fixing member 3 includes a pressing plate 31 and a pressing groove 32;

[0022] Among them, oblong bolt connection holes 311 are provided on both sides of the pressing plate 31.

[0023] A bolt hole 13 is provided at the end of the positioning block 1, and the first bolt 51 passes through the bolt connection hole 311 and is screwed into the bolt hole 13, so that the heating rope fixing member 3 is fixedly installed on the positioning block 1;

[0024] The pressing groove 32 is located in the middle of the pressing plate 31 , and multiple rows of semicircular grooves 321 are opened on the pressing groove 32 . The semicircular grooves 321 limit the spacing between multiple medium frequency heating ropes 7 , so that the upper wing plate 61 and the lower wing plate 62 are heated evenly.

[0025] The auxiliary device further comprises at least two support rings 4, through which the support unit and the large H-shaped support beam 6 are supported and installed;

[0026] A roller frame 8 is provided below the support ring 4, and the support ring 4 is supported and rotated by rollers on the roller frame 8, thereby quickly adjusting the flip angle of the large H-shaped support beam 6, so that the weld between the wing plate and the web 63 is at an optimal welding angle.

[0027] The support ring 4 includes two semi-circular arc plates 41 that can be fixed together. Two rib plates 42 are arranged inside the semi-circular arc plates 41, and the distance between the two rib plates 42 is slightly greater than the thickness of the positioning block 1.

[0028] The rib plate 42 is provided with a rib plate through hole 43.

[0029] A positioning through hole 14 is provided on the positioning block 1.

[0030] The positioning block 1 is fixed to the support ring 4 by the second bolt 52 passing through the rib plate through hole 43 and the positioning through hole 14, and then the support unit and the large H-shaped support beam 6 are supported and installed by the support ring.

[0031] The present invention also provides a method for welding a large H-shaped support beam for a steam generator, which method is realized by the auxiliary device for welding the large H-shaped support beam for a steam generator as described above.

[0032] The method comprises the following steps:

[0033] Step 1, assembling the wing plate and the web plate; intermittent spot welding is performed between the web plate 63 and the upper wing plate 61 and the lower wing plate 62 at the groove in the longitudinal direction of the web plate, so that the wing plate and the web plate are temporarily fixedly connected to form a large H-shaped support beam;

[0034] Step 2, symmetrically install the support units of the auxiliary device welded with the large H-shaped support beam for the steam generator on the inner edges of the upper wing plate 61 and the lower wing plate 62; install two groups of support units at intervals of 0.5m along the length direction;

[0035] Step 3, lay the medium frequency heating rope 7 on the outer side of the upper wing plate 61 and the lower wing plate 62, and pre-tighten the heating rope fixing member 3 to the positioning block 1 through the connecting bolt 51, so that the medium frequency heating rope 7 is fixed in the pressing groove 32, ensuring that the medium frequency heating rope 7 is well fitted along the length direction of the wing plate;

[0036] Step 4: symmetrically select two groups of support units at both ends of the large H-shaped support beam, fix the support ring 4 to the support unit through the second bolt 52, and then lift the whole and place it on the roller frame 8;

[0037] Step 5: The medium frequency heating rope 7 is powered on to heat the wing plate, and welding begins when the temperature meets the requirement;

[0038] Preferably, flat welding is adopted, and the position of the welding shell is adjusted by rotating the roller frame 8; after welding one or two layers on one side of the web, the roller frame 8 is adjusted to flip the web 180° to weld one or two layers of the back groove; the welding is repeated alternately in this order until the weld is filled.

[0039] Among them, in step 2, after the support unit is installed, the bidirectional screw sleeve 2 is pre-tightened to a torque greater than 50Nm, so that the upper wing plate 61 and the lower wing plate 62 are always subjected to an outward supporting force to offset the welding shrinkage stress and prevent them from bending due to heat.

[0040] The beneficial effects of the present invention include:

[0041] (1) According to the auxiliary device and welding method for welding a large H-shaped support beam for a steam generator provided by the present invention, in the device and method, the fixing blocks symmetrically arranged on the inner sides of the two wing plates and the two-way screw sleeve top fixing form can effectively suppress the welding deformation such as angle tilt and wing plate bending caused by the T-shaped weld between the web plate and the wing plate;

[0042] (2) According to the auxiliary device and welding method for welding a large H-shaped support beam for a steam generator provided by the present invention, in the device and method, the heating rope fixing part can always keep the medium frequency heating rope in contact with the wing plate, and will not fall off during the lifting and turning process of the large H-shaped support beam, thereby ensuring stable heating during the welding process;

[0043] (3) According to the auxiliary device and welding method for welding a large H-shaped support beam for a steam generator provided by the present invention, in the device and method, the support ring can realize stable horizontal rotary welding of the large H-shaped support beam, easily realize alternating welding on both sides of the web groove, and better control welding deformation;

[0044] (4) According to the auxiliary device and welding method for welding large H-shaped support beams for steam generators provided by the present invention, the device has strong versatility and can be used in the welding of H-shaped support beams of various specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 The overall structural schematic diagram of the auxiliary device for welding a large H-shaped support beam for a steam generator provided by the present application is shown;

[0046] Figure 2 A cross-sectional view showing the auxiliary device for welding a large H-shaped support beam for a steam generator provided by the present application supporting the large H-shaped support beam;

[0047] Figure 3 A schematic diagram showing the size requirements of a large H-shaped support beam to be welded in this application;

[0048] Figure 4 A schematic diagram showing the deformation trend of welding of the upper flange and the web of a large H-shaped support beam to be welded in this application;

[0049] Figure 5 A schematic diagram showing the structure of a positioning block in an auxiliary device for welding a large H-shaped support beam for a steam generator provided by the present application is shown;

[0050] Figure 6 A cross-sectional view of a bidirectional threaded sleeve in an auxiliary device for welding a large H-shaped support beam for a steam generator provided by the present application is shown;

[0051] Figure 7 A schematic diagram of the connection structure between the positioning block and the bidirectional screw sleeve in the auxiliary device for welding a large H-shaped support beam for a steam generator provided by the present application is shown;

[0052] Figure 8 A schematic diagram showing the structure of a heating rope fixing member in an auxiliary device for welding a large H-shaped support beam for a steam generator provided by the present application;

[0053] Fig. 9 A schematic diagram showing the structure of a support ring in an auxiliary device for welding a large H-shaped support beam for a steam generator provided by the present application is shown;

[0054] Fig.10 A schematic diagram of the connection structure between the support ring and the positioning block in the auxiliary device for welding a large H-shaped support beam for a steam generator provided by the present application is shown;

[0055] Fig.11 A schematic diagram of the flat welding position of the flange and web groove of a large H-shaped support beam in the auxiliary device for welding a large H-shaped support beam for a steam generator provided by the present application is shown.

[0056] Description of Reference Numerals

[0057] 1- Positioning card block

[0058] 11-Card slot

[0059] 111-Bottom end face

[0060] 112-side end face

[0061] 12-Top stud

[0062] 13-Bolt hole

[0063] 14-Positioning hole

[0064] 2-Double direction screw sleeve

[0065] 21-Right-hand thread hole

[0066] 22-Left-hand thread hole

[0067] 23-Pre-tightening hole

[0068] 3- Heating rope fixing

[0069] 31-Press plate

[0070] 311-Bolt connection hole

[0071] 32-Pressure groove

[0072] 321-semicircular groove

[0073] 4-Support ring

[0074] 41-semicircular plate

[0075] 42-rib plate

[0076] 43-rib plate through hole

[0077] 51-First bolt

[0078] 52-Second bolt

[0079] 6-Large H-shaped support beam

[0080] 61-Upper wing plate

[0081] 62-Lower wing plate

[0082] 63-belly plate

[0083] 7-Intermediate frequency heating rope

[0084] 8-Roller rack

[0085] 81-Roller

[0086] L-large H-shaped support beam flange inner spacing

[0087] PA - Flat welding position DETAILED DESCRIPTION

[0088] The present invention will be further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present invention will become more clear and distinct.

[0089] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0090] The present invention provides an auxiliary device for welding a large H-shaped support beam for a steam generator, such as Figure 1 , Figure 2 and Figure 3 As shown in , the large H-shaped support beam 6 includes a wing plate and a web plate 63, the wing plate includes an upper wing plate 61 and a lower wing plate 62 arranged parallel to each other, one end of the web plate 63 is fixed to the middle of the upper wing plate 61, the other end of the web plate 63 is fixed to the middle of the lower wing plate 62, and the web plate 63 is perpendicular to the upper wing plate 61 and the lower wing plate 62;

[0091] The auxiliary device comprises a plurality of supporting units, wherein the supporting units comprise two positioning blocks 1 and a bidirectional screw sleeve 2 connecting the two positioning blocks. Figure 5 and Figure 6 As shown in;

[0092] In the support unit, one positioning block 1 is close to the upper wing plate 61, and the other positioning block 1 is close to the lower wing plate 62. The length of the support unit is adjusted by screwing the bidirectional screw sleeve 2, so that the support unit supports the upper wing plate 61 and the lower wing plate 62 from the inside to the outside to prevent welding deformation when welding the large H-shaped support beam.

[0093] In a preferred embodiment, a slot 11 is provided on the positioning block 1, and the slot 11 is composed of a bottom end face 111 and a side end face 112 which are perpendicular to each other. When the positioning block 1 is pressed against the wing plate, the bottom end face 111 abuts against the bottom surface of the wing plate, and the side end face 112 abuts against the side surface of the wing plate. Preferably, a portion of the structure is cut out inwardly at the connection position between the bottom end face 111 and the side end face 112 to ensure that the bottom end face 111 and the side end face 112 can be pressed against the wing plate at the same time.

[0094] Preferably, a top support stud 12 is provided on the positioning block 1, and a T-shaped thread is provided on the top support stud 12;

[0095] The two top support studs 12 in the support unit have different directions of rotation of the T-shaped threads, one is left-handed and the other is right-handed;

[0096] One end of the bidirectional screw sleeve 2 is provided with a right-hand threaded hole 21, and the other end is provided with a left-hand threaded hole 22. A pre-tightening hole 23 is opened in the middle of the bidirectional screw sleeve 2. The bidirectional screw sleeve 2 is screwed through the pre-tightening hole 23 to adjust the length of the support unit. Figure 7 as shown in .

[0097] Preferably, the auxiliary device further comprises a plurality of heating rope fixing members 3, such as Figure 8 The heating rope fixing member 3 is arranged on the outer side of the upper wing plate 61 and the lower wing plate 62,

[0098] The heating rope fixing member 3 is fixedly mounted on the positioning block 1;

[0099] The medium frequency heating rope 7 is fixed to the outer sides of the upper wing plate 61 and the lower wing plate 62 through the heating rope fixing part 3, and then the upper wing plate 61 and the lower wing plate 62 are heated by the medium frequency heating rope 7, so that the temperature around the weld is controlled at 150-210°C during welding.

[0100] Preferably, the heating rope fixing member 3 comprises a pressing plate 31 and a pressing groove 32;

[0101] Wherein, oblong bolt connection holes 311 are provided on both sides of the pressing plate 31, and the pressing plate 31 is a metal plate;

[0102] A bolt hole 13 is provided at the end of the positioning block 1, and the first bolt 51 passes through the bolt connection hole 311 and is screwed into the bolt hole 13, so that the heating rope fixing member 3 is fixedly installed on the positioning block 1;

[0103] The pressing groove 32 is located in the middle of the pressing plate 31, and has multiple rows of semicircular grooves 321, which define the spacing between multiple medium frequency heating ropes 7, so that the upper wing plate 61 and the lower wing plate 62 are heated evenly. The pressing groove 32 is made of a temperature-resistant nylon plate.

[0104] Preferably, the auxiliary device further comprises at least two support rings 4, through which the support unit and the large H-shaped support beam 6 are supported and installed;

[0105] A roller frame 8 is provided below the support ring 4, and the support ring 4 is supported and rotated by rollers on the roller frame 8, thereby quickly adjusting the flip angle of the large H-shaped support beam 6, so that the weld between the wing plate and the web 63 is at an optimal welding angle.

[0106] Preferably, if Fig. 9 As shown in , the support ring 4 includes two semi-circular arc plates 41 that can be consolidated into one body, two rib plates 42 are arranged inside the semi-circular arc plates 41, and the distance between the two rib plates 42 is slightly greater than the thickness of the positioning block 1.

[0107] The rib plate 42 is provided with a rib plate through hole 43.

[0108] A positioning through hole 14 is provided on the positioning block 1.

[0109] The positioning block 1 is fixed to the support ring 4 by the second bolt 52 passing through the rib plate through hole 43 and the positioning through hole 14, and then the support unit and the large H-shaped support beam 6 are supported and installed by the support ring.

[0110] The present application also provides a method for welding a large H-shaped support beam for a steam generator, and the method is implemented by the auxiliary device for welding the large H-shaped support beam for a steam generator as described above.

[0111] In a preferred embodiment, the method comprises the following steps:

[0112] Step 1, assembling the wing plate and the web plate; intermittent spot welding is performed between the web plate 63 and the upper wing plate 61 and the lower wing plate 62 at the groove in the longitudinal direction of the web plate, so that the wing plate and the web plate are temporarily fixedly connected to form a large H-shaped support beam;

[0113] Step 2, symmetrically install the support units in the auxiliary device for welding the large H-shaped support beam for the steam generator on the inner edges of the upper wing plate 61 and the lower wing plate 62; install two groups of support units at intervals of 0.5m along the length direction, and this distance does not affect the welding operation space and can effectively provide better supporting force; after installation, pre-tighten the bidirectional screw sleeve 2 to a torque of >50Nm, so that the upper wing plate 61 and the lower wing plate 62 are always subjected to the outward supporting force, offset the welding shrinkage stress, and prevent them from being bent due to heat; preferably, when the width of the web 62 of the large H-shaped support beam for the steam generator is 318mm, since the weld will shrink inward during welding, the distance L between the upper wing plate 61 and the lower wing plate 62 is controlled at 318mm with a tolerance of 0 to +1mm;

[0114] Step 3, lay the medium frequency heating rope 7 on the outer side of the upper wing plate 61 and the lower wing plate 62, and pre-tighten the heating rope fixing member 3 to the positioning block 1 through the connecting bolt 51, so that the medium frequency heating rope 7 is fixed in the pressing groove 32, ensuring that the medium frequency heating rope 7 is well fitted along the length direction of the wing plate;

[0115] Step 4: symmetrically select two groups of support units at both ends of the large H-shaped support beam, and fix the support ring 4 and the support unit by the second bolt 52 to form two complete circles, and then hoist the whole and place it on the roller frame 8, so that the support ring 4 abuts against the roller 81 of the roller frame 8;

[0116] Step 5: The medium frequency heating rope 7 is energized to heat the wing plate to ensure that the heating temperature is always maintained within the required range. When the temperature meets the requirements, welding begins. Flat welding is adopted for welding, and the roller frame 8 is used for rotation adjustment. In the process, symmetrical welding is adopted on both sides of the web to further control deformation. That is, after welding one or two layers on one side, the roller frame 8 is adjusted to flip the web 180° to weld one or two layers of the back groove. The welding is repeated alternately in this order until the weld is filled. After each flip, the temperature of the welding area and the dimension L between the upper wing plate 61 and the lower wing plate 62 are checked to ensure that the requirements are met.

[0117] Example

[0118] The fixed support assembly for the steam generator equipment in the nuclear island containment of the AP1000 pressurized water reactor nuclear power plant is mainly composed of a large H-shaped support beam, which is welded by the upper wing plate 61, the lower wing plate 62 and the middle web plate 63, and is made of corrosion-resistant low-alloy steel. The length of the H-shaped support beam is 5m, the thickness of the wing plate is 78mm, and the width is 426mm; the thickness of the web plate 63 is 48mm and the width is 318mm. Double-sided grooves are processed at both ends of the web plate 63, and full penetration welding is required between the wing plate and the web plate. The temperature of the welding area during welding is required to be between 150 and 200℃. After welding, the H-shaped support beam is finally required to have an overall straightness of ≤5mm, and the parallelism between the upper wing plate 61 and the lower wing plate 62, the verticality between the wing plate and the web plate 62, and the flatness of the wing plate are all ≤1.5mm.

[0119] In order to reduce costs and save processing time, no allowance is added to the flange and web. When the flange and web are ready for use, follow the steps below to install and weld:

[0120] Step 1, assembling the wing plate and the web plate; intermittent spot welding is performed between the web plate 63 and the upper wing plate 61 and the lower wing plate 62 at the groove in the longitudinal direction of the web plate, so that the wing plate and the web plate are temporarily fixedly connected to form a large H-shaped support beam;

[0121] Step 2: symmetrically install the upper wing plate 61 and the lower wing plate 62 on the inner edges. Figure 1 and Figure 2 The supporting unit in the auxiliary device welded with a large H-shaped support beam for the steam generator shown in the figure; two sets of supporting units are installed at intervals of 0.5m along the length direction; after installation, the two-way screw sleeve 2 is pre-tightened to a torque of >50Nm; the spacing L between the upper wing plate 61 and the lower wing plate 62 is controlled at 318mm with a tolerance of 0 to +1mm;

[0122] Step 3: lay the medium frequency heating rope 7 on the outer sides of the upper wing plate 61 and the lower wing plate 62, and connect the heating rope 7 with the connecting bolts 51. Figure 8 The hot rope fixing member 3 shown in the figure is pre-tightened and fixed on the positioning block 1, so that the medium frequency heating rope 7 is fixed in the pressing groove 32, ensuring that the medium frequency heating rope 7 is well fitted along the length direction of the wing plate;

[0123] Step 4: At both ends of the large H-shaped support beam, select two groups of support units symmetrically and use the second bolt 52 to fix the two groups of support units. Fig. 9 The support ring 4 shown in the figure is fixed with the support unit to form two complete rings, which are then hoisted as a whole and placed on the roller frame 8 so that the support ring 4 abuts against the roller 81 of the roller frame 8;

[0124] Step 5: The medium frequency heating rope 7 is powered on to heat the wing plate to ensure that the heating temperature is always maintained within the required range. When the temperature at the weld reaches 150-200°C, welding begins. Flat welding is adopted and the roller frame 8 is used for rotation adjustment. In the process, symmetrical welding is adopted on both sides of the web to further control deformation. That is, after welding one or two layers on one side, the roller frame 8 is adjusted to flip the web 180° to weld one or two layers of the back groove. The welding is repeated alternately in this order until the weld is filled. After each flip, the temperature of the welding area and the dimension L between the upper wing plate 61 and the lower wing plate 62 are checked to ensure that the requirements are met.

[0125] After the weld of the large H-shaped support beam 6 is completely cooled, all auxiliary devices are removed and the values ​​of various tolerance requirements are measured. The specific dimensions after welding are as follows:

[0126] (1) The flatness requirement of the wing plate after welding is ≤1.5mm, and the flatness measured after welding is 0.4mm;

[0127] (2) The verticality between the flange and the web is required to be ≤1.5mm. After welding, the verticality measured at multiple points along the length direction is 0.4~1mm;

[0128] (2) The inner distance L between the upper wing plate and the lower wing plate is required to be 318±1.5mm. After welding, measure L at multiple points along the length direction to be 316.9~318.8mm

[0129] The temperature detection records during the welding process were always maintained between 165 and 190°C. The above detection data all indicate that the auxiliary device and welding method for welding large H-shaped support beams for steam generators provided in this application can meet the precision requirements of nuclear power equipment.

[0130] The present invention has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, the present invention may be subjected to a variety of substitutions and improvements, all of which fall within the scope of protection of the present invention.

Claims

1. An auxiliary device for welding large H-shaped support beams for steam generators, characterized in that: The large H-shaped support beam (6) comprises a wing plate and a web plate (63), wherein the wing plate comprises an upper wing plate (61) and a lower wing plate (62) arranged in parallel with each other, one end of the web plate (63) is fixed to the middle of the upper wing plate (61), and the other end of the web plate (63) is fixed to the middle of the lower wing plate (62), and the web plate (63) is perpendicular to the upper wing plate (61) and the lower wing plate (62); The auxiliary device comprises a plurality of groups of support units, wherein the support units comprise two positioning blocks (1) and a bidirectional screw sleeve (2) connecting the two positioning blocks; In the support unit, one positioning block (1) is closely attached to the upper wing plate (61), and the other positioning block (1) is closely attached to the lower wing plate (62). The length of the support unit is adjusted by screwing the bidirectional screw sleeve (2), so that the support unit supports the upper wing plate (61) and the lower wing plate (62) from the inside to the outside, thereby preventing welding deformation when welding the large H-shaped support beam.

2. The auxiliary device for welding large H-shaped support beams for steam generators according to claim 1, characterized in that: A card slot (11) is provided on the positioning card block (1), and the card slot (11) is composed of a bottom end surface (111) and a side end surface (112) which are perpendicular to each other. When the positioning card block (1) is pressed against the wing plate, the bottom end surface (111) abuts against the bottom surface of the wing plate, and the side end surface (112) abuts against the side surface of the wing plate.

3. The auxiliary device for welding large H-shaped support beams for steam generators according to claim 1, characterized in that: A top support stud (12) is provided on the positioning block (1), and a T-shaped thread is provided on the top support stud (12); The two top support studs (12) in the support unit have different directions of rotation of the T-shaped threads, one is left-handed and the other is right-handed; One end of the bidirectional screw sleeve (2) is provided with a right-hand threaded hole (21), and the other end is provided with a left-hand threaded hole (22). A pre-tightening hole (23) is provided in the middle of the bidirectional screw sleeve (2). The bidirectional screw sleeve (2) is screwed through the pre-tightening hole (23) to adjust the length of the support unit.

4. The auxiliary device for welding large H-shaped support beams for steam generators according to claim 1, characterized in that: The auxiliary device further comprises a plurality of heating rope fixing members (3); the heating rope fixing members (3) are arranged on the outer sides of the upper wing plate (61) and the lower wing plate (62). The heating rope fixing member (3) is fixedly mounted on the positioning block (1); The medium frequency heating rope (7) is fixed and attached to the outer sides of the upper wing plate (61) and the lower wing plate (62) by means of the heating rope fixing member (3), and then the upper wing plate (61) and the lower wing plate (62) are heated by the medium frequency heating rope (7), so that the temperature around the weld is controlled at 150-210°C during the welding process.

5. The auxiliary device for welding large H-shaped support beams for steam generators according to claim 4, characterized in that: The heating rope fixing member (3) comprises a pressing plate (31) and a pressing groove (32); Wherein, oblong bolt connection holes (311) are provided on both sides of the pressing plate (31). A bolt hole (13) is provided at the end of the positioning block (1), and a first bolt (51) passes through the bolt connection hole (311) and is screwed into the bolt hole (13), thereby fixing the heating rope fixing member (3) on the positioning block (1); The pressing groove (32) is located in the middle of the pressing plate (31), and a plurality of rows of semicircular grooves (321) are provided on the pressing groove (32). The semicircular grooves (321) limit the spacing between the plurality of medium frequency heating ropes (7), so that the upper wing plate (61) and the lower wing plate (62) are heated evenly.

6. The auxiliary device for welding large H-shaped support beams for steam generators according to claim 1, characterized in that: The auxiliary device also includes at least two support rings (4), through which the support unit and the large H-shaped support beam (6) are supported and installed; A roller frame (8) is arranged below the support ring (4), and the rollers on the roller frame (8) support and rotate the support ring (4), thereby quickly adjusting the flip angle of the large H-shaped support beam (6), so that the weld between the wing plate and the web (63) is at an optimal welding angle.

7. The auxiliary device for welding a large H-shaped support beam for a steam generator according to claim 6, characterized in that: The support ring (4) comprises two semi-circular arc plates (41) that can be fixed together. Two rib plates (42) are arranged inside the semi-circular arc plates (41), and the distance between the two rib plates (42) is slightly greater than the thickness of the positioning block (1). A rib plate through hole (43) is provided on the rib plate (42). A positioning through hole (14) is provided on the positioning block (1). The positioning block (1) is fixed to the support ring (4) by a second bolt (52) passing through the rib plate through hole (43) and the positioning through hole (14), and the support unit and the large H-shaped support beam (6) are then supported and installed by the support ring.

8. A method for welding a large H-shaped support beam for a steam generator, characterized in that: The method is realized by the auxiliary device for welding a large H-shaped supporting beam for a steam generator as claimed in any one of claims 1 to 7.

9. The welding method of a large H-shaped support beam for a steam generator according to claim 8, characterized in that: The method comprises the following steps: Step 1, assembling the wing plate and the web plate; intermittent spot welding is performed between the web plate (63) and the upper wing plate (61) and the lower wing plate (62) at the groove in the longitudinal direction of the web plate, so that the wing plate and the web plate are temporarily fixedly connected to form a large H-shaped support beam; Step 2, symmetrically installing support units of an auxiliary device welded with a large H-shaped support beam for a steam generator on the inner edges of the upper wing plate (61) and the lower wing plate (62); installing two groups of support units at intervals of 0.5 m along the length direction; Step 3, laying the medium frequency heating rope (7) on the outside of the upper wing plate (61) and the lower wing plate (62), and pre-tightening and fixing the heating rope fixing member (3) on the positioning block (1) by connecting bolts (51), so that the medium frequency heating rope (7) is fixed in the pressing groove (32), ensuring that the medium frequency heating rope (7) is well fitted along the length direction of the wing plate; Step 4: symmetrically select two groups of support units at both ends of the large H-shaped support beam, fix the support ring (4) and the support unit with the second bolt (52), and then lift the whole and place it on the roller frame (8); Step 5: The medium frequency heating rope (7) is powered on to heat the wing plate, and welding begins when the temperature meets the requirement; Preferably, flat welding is adopted, and the position of the welding shell breaking is adjusted by rotating the roller frame (8); after welding one or two layers on one side of the web, the roller frame (8) is adjusted to turn the web 180 degrees to weld one or two layers of the back groove; and welding is repeated alternately in this order until the weld is filled.

10. The welding method of a large H-shaped support beam for a steam generator according to claim 9, characterized in that: In step 2, after the support unit is installed, the bidirectional screw sleeve (2) is pre-tightened to a torque greater than 50 Nm, so that the upper wing plate (61) and the lower wing plate (62) are always subjected to an outward supporting force to offset the welding shrinkage stress and prevent them from bending due to heat.

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