CN104625459A - Welding groove of passive nuclear power plant steel containment - Google Patents
Welding groove of passive nuclear power plant steel containment Download PDFInfo
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- CN104625459A CN104625459A CN201410806180.2A CN201410806180A CN104625459A CN 104625459 A CN104625459 A CN 104625459A CN 201410806180 A CN201410806180 A CN 201410806180A CN 104625459 A CN104625459 A CN 104625459A
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- welding
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- mother metal
- bevel
- steel containment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
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- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention belongs to the technical field of welding of metals. The invention discloses a welding groove of a passive nuclear power plant steel containment which is aimed at solving the problem that welding deformation is prone to occur in the current method on steel containment welding. The welding groove comprises two parts arranged symmetrically along the centerline of the base material, the two parts are in a V-shaped structure respectively, and the assembly interval of the welding groove is 2 mm to 4.5 mm. The welding groove has the advantages that the base material non-deformation during the welding of steel containment is guaranteed, and the welding quality is improved.
Description
Technical field
The invention belongs to the technical field of metal solder, be specifically related to a kind of bevel for welding of non-active steel containment vessel of nuclear power station.
Background technology
Non-active nuclear power station refers to when there is emergency episode, do not need outside emergency power supply, and by natural phenomenas such as gravity, potential energy (elevated tank), Natural Circulation and evaporations, drive water quench reactor and steel containment vessel, the nuclear power station that carry heat is gone out, can ensure in 72 hours without the need to human intervention.The important component part of the Secure isolation system of the active nuclear power station of steel containment vessel right and wrong, Fig. 1 is the structural representation of steel containment vessel, and as shown in Figure 1, steel containment vessel comprises cover head 63, cylindrical shell 64 and bottom (head) 65.Cylindrical shell 64 is high 73 meters, and diameter is 43 meters, is welded altogether by 144 blocks of arc plates; Cover head 63 and bottom (head) 65 are welded by 82 blocks of melon flap sheet materials respectively; The main material of above-mentioned arc plate and melon flap sheet material is SA738Gr.B, and thickness is between 45-55 millimeter.During current welding steel containment vessel, the groove type usually adopted is double V-shaped, uses the welding method of pulse MAG (Metal Active Gas Arc Welding, consumable electrode metal active gas arc welding); Fig. 2 is the structural representation of the groove that prior art welding steel containment vessel adopts, as shown in Figure 2, groove between two mother metals 61 to be welded is double V-shaped structure, and the angle [alpha] of two V-type parts of this double V-shaped structure and β are respectively 60-70 degree and 70-80 degree; Be provided with root face 62 bottom groove, first bottoming welding from the root face bottom groove during welding, then multilayer fills welding, finally carries out cover welding; In welding process, the wlding of fusing can expand with heat and contract with cold, pulling force can be produced to mother metal during the wlding shrinkage of melting, the welding method of prior art is from root face bottom groove, in layer upwards weld, the wlding of fusing like this makes two mother metals adjacent to each other, after causing welding to complete to the pulling force of mother metal always, easily there is welding deformation in mother metal, affects welding quality.
Summary of the invention
In order to the method solving current welding steel containment vessel easily produces the problem of welding deformation, the present invention proposes a kind of bevel for welding of non-active steel containment vessel of nuclear power station, to avoid producing welding deformation, improves welding quality.
Bevel for welding of the present invention comprises two parts of the center line symmetry about mother metal, and these two parts are respectively V-structure; The group of described bevel for welding is 2-4.5 millimeter to gap.
Wherein, two parts of described bevel for welding are respectively single V-structure, and the angle of this single V-structure is 30-50 degree.
Wherein, two parts of described bevel for welding are respectively double V-shaped structure, and the angle of the V-type part of the center line of the close described mother metal of this double V-shaped structure is 25-30 degree, and the angle away from the V-type part of the center line of described mother metal is 15-20 degree; The junction of two V-type parts of described double V-shaped structure is 8-12 millimeter to the distance of the center line of mother metal.The junction of two V-type parts of described double V-shaped structure is 8-12 millimeter to the distance of the center line of mother metal, makes welding gun have enough spaces to carry out normal welding activity so on the one hand; On the other hand, ensure that the V-type part away from the center line of mother metal accounts for certain proportion in whole groove space, because less than the angle of the V-type part of the center line of close mother metal away from the angle of the V-type part of the center line of mother metal, better can save wlding.
Wherein, the thickness of described mother metal is 20-150 millimeter.
The beneficial effect of bevel for welding of the present invention: the bevel for welding of prior art is double V-shaped structure, and the angle [alpha] of two V-type parts of this double V-shaped structure and β are respectively 60-70 degree and 70-80 degree; And be provided with root face bottom groove; First bottoming welding from the root face bottom groove during welding, then multilayer fills welding, finally carries out cover welding; In welding process, the wlding of fusing pulling force is produced to mother metal because of the effect of expanding with heat and contract with cold, this pulling force easily makes mother metal generation welding deformation; And bevel for welding of the present invention comprises two parts of the center line symmetry about mother metal, these two parts are respectively single V-type or double V-shaped structure; The angle of single V-structure is 30-50 degree; The angle of two V-type parts of double V-shaped structure is respectively 25-30 degree and 15-20 degree; Compared with the groove of prior art, the angle of V-type part of the present invention has diminished, and the space of groove has diminished, the wlding of filling in groove when which reduces welding, thus saves wlding; The angle of the V-type part of groove of the present invention has diminished, but proves through using in practice of construction, and the angle of groove of the present invention can adapt to the requirement of automatic welding, can not affect the operation of automatic welding because groove space is little; The steadiness simultaneously having welded rear welding point also meets the requirements.When groove of the present invention is welded, by the upper and lower alternately welding to groove, the wlding of fusing also can produce pulling force to mother metal when expanding with heat and contract with cold, but the wlding of the pulling force that the wlding on groove top produces mother metal and groove bottom can be cancelled out each other to the pulling force that mother metal produces, so just greatly reduce the pulling force that the wlding that melts in welding process produces mother metal, avoid the generation of the situation of mother metal generation welding deformation in welding process to a great extent, improve welding quality.
Accompanying drawing explanation
Fig. 1 is the structural representation of steel containment vessel;
Fig. 2 is the structural representation of the groove that prior art welding steel containment vessel adopts;
Fig. 3 is the structural representation of the bevel for welding of the non-active steel containment vessel of nuclear power station of the first embodiment of the present invention;
Fig. 4 is the structural representation of the bevel for welding of the non-active steel containment vessel of nuclear power station of the second embodiment of the present invention;
Fig. 5 is the schematic diagram of the welding method corresponding with the bevel for welding of non-active steel containment vessel of nuclear power station of the present invention;
Fig. 6 is the structural representation of the groove of comparative example 1.
Detailed description of the invention
Bevel for welding of the present invention is introduced below in conjunction with Fig. 3-Fig. 6.
Embodiment one:
As shown in Figure 3, bevel for welding of the present invention comprises two parts, top 210 and bottom 211; Top 210 and bottom 211 are respectively single V-structure, and top 210 and bottom 211 with the center line of mother metal 212 for symmetry axis is symmetrical mutually; The angle [alpha] of single V-structure is 30 degree; The group of bevel for welding is 2 millimeters to gap L.Wherein, the thickness of mother metal 212 is 20 millimeters.
As shown in Figure 5, in Fig. 5, arrow direction is upper, and the welding method of the groove of the present embodiment is:
(1) to mother metal preheating;
(2) adopt manual welding or automatic welding, spot welding is carried out to mother metal; Adopt automatic welding to carry out spot welding to mother metal, welding parameter is: electric current 120-160A, voltage 20-28V, speed of welding 1.5-3.0inch/min, wire feed rate 140-170inch/min, amplitude of fluctuation 10-20mm, swing speed 8Hz, shield gas flow rate 20-30L/min; Or adopt manual welding to carry out spot welding to mother metal, welding parameter is: electric current 130-150A, voltage 18-30V, speed of welding 1.5-4.0inch/min, amplitude of fluctuation 10-20mm, swing speed 6Hz.
(3) to the top bottoming welding welding bead 1 of groove, the welding parameter of bottoming welding is: electric current 110-140A, voltage 20-30V, speed of welding 3.0-8.0inch/min, wire feed rate 140-170inch/min, amplitude of fluctuation 10-20mm, swing speed 8Hz, shield gas flow rate 20-30L/min; Then the two-layer welding bead of welding is filled; welding bead 2 and welding bead 3; the welding parameter of filling welding is: electric current 120-140A; voltage 20-30V; speed of welding 2.0-7.0inch/min, wire feed rate 130-180inch/min, amplitude of fluctuation 14-21mm; swing speed 7Hz, shield gas flow rate 24-40L/min.
(4) to the bottom bottoming welding welding bead 4 of groove, the welding parameter of bottoming welding is identical with the parameter that bottoming in step (3) is welded; Then fill welding welding bead 5, welding bead 6 and welding bead 7, the welding parameter of filling welding is identical with filling the parameter of welding in step (3).
(5) continue to fill welding, until capping completes the welding of this part to the top of groove; Wherein, the parameter of filling welding is identical with filling the parameter of welding in step (3); The parameter of cover welding: electric current 120-135A, voltage 22-26V, speed of welding 2.0-7.5inch/min, wire feed rate 120-160inch/min, amplitude of fluctuation 20-25mm, swing speed 5-10Hz, shield gas flow rate 30-40L/min.
(6) continue to fill welding, until capping completes the welding of this part to the bottom of groove; Wherein, the parameter of filling welding is identical with filling the parameter of welding in step (3); The parameter of cover welding is identical with the parameter of cover welding in step (5).
In the filling welding process of step (3)-step (6), when weld width is 2-20 millimeter, adopt the welding of individual layer single track; When weld width is more than 20 millimeters, adopt the welding of pressure road; Step (3)-step (6) can adopt the welding method of automatic welding.
The welding deformation having welded rear measurement mother metal is 2 °.
Embodiment two:
As shown in Figure 3, bevel for welding of the present invention comprises two parts, top 210 and bottom 211; Top 210 and bottom 211 are respectively single V-structure, and top 210 and bottom 211 with the center line of mother metal 212 for symmetry axis is symmetrical mutually; The angle [alpha] of single V-structure is 50 degree; The group of bevel for welding is 4.5 millimeters to gap L.Wherein, the thickness of mother metal 212 is 150 millimeters.
The welding method of the groove of the present embodiment is identical with the welding method of embodiment one.The welding deformation having welded rear measurement mother metal is 1 °.
Embodiment three:
As shown in Figure 4, bevel for welding of the present invention comprises two parts, top 220 and bottom 221; Top 220 and bottom 221 are respectively double V-shaped structure, and top 220 and bottom 221 with the center line of mother metal 222 for symmetry axis is symmetrical mutually; Wherein, the angle [alpha] near the V-type part of the center line of mother metal 222 is 25 degree; Angle beta away from the V-type part of the center line of mother metal 222 is 15 degree; V-type part near the center line of mother metal 222 and the junction away from the V-type part of the center line of mother metal 222 are 8 millimeters to the distance H of the center line of mother metal 222; The group of bevel for welding is 2 millimeters to gap L.Wherein, the thickness of mother metal 222 is 20 millimeters.
The welding method of the groove of the present embodiment is identical with the welding method of embodiment one.The welding deformation having welded rear measurement mother metal is 1 °.
Embodiment four:
As shown in Figure 4, bevel for welding of the present invention comprises two parts, top 220 and bottom 221; Top 220 and bottom 221 are respectively double V-shaped structure, and top 220 and bottom 221 with the center line of mother metal 222 for symmetry axis is symmetrical mutually; Wherein, the angle [alpha] near the V-type part of the center line of mother metal 222 is 30 degree; Angle beta away from the V-type part of the center line of mother metal 222 is 20 degree; V-type part near the center line of mother metal 222 and the junction away from the V-type part of the center line of mother metal 222 are 12 millimeters to the distance H of the center line of mother metal 222; The group of bevel for welding is 4.5 millimeters to gap L.Wherein, the thickness of mother metal 222 is 150 millimeters.
The welding method of the groove of the present embodiment is identical with the welding method of embodiment one.The welding deformation having welded rear measurement mother metal is 2 °.
The form of bevel for welding of the present invention is adopted during welding, by the upper and lower alternately welding to groove, the wlding of fusing can produce pulling force to mother metal when expanding with heat and contract with cold, but the wlding of the pulling force that the wlding on groove top produces mother metal and groove bottom can be cancelled out each other to the pulling force that mother metal produces, so just greatly reduce the pulling force that the wlding that melts in welding process produces mother metal, avoid the generation of the situation of mother metal generation welding deformation in welding process to a great extent, improve welding quality.
Comparative example 1:
As shown in Figure 6, the groove between two mother metals 71 to be welded is single V-structure to the groove of comparative example 1, and be provided with root face 72 bottom groove, the angle [alpha] of groove is 60 degree.This comparative example and embodiment one contrast.
The welding method of the groove of this comparative example:
(1) identical with the step (1) of the welding method of the groove of embodiment one;
(2) identical with the step (2) of the welding method of the groove of embodiment one;
(3) first bottoming welding from the root face bottom groove, the parameter of bottoming welding is identical with the parameter that the bottoming of the step (3) of the welding method of the groove of embodiment one is welded;
(4) multilayer fills welding, and the parameter of filling welding is identical with the parameter that the filling of the step (3) of the welding method of the groove of embodiment one is welded;
(5) cover welding is until complete welding, and the parameter of cover welding is identical with the parameter of the cover welding in the step (5) of the welding method of the groove of embodiment one.
The welding deformation having welded rear measurement mother metal is 13 °.
Comparative example 2:
As shown in Figure 6, the groove between two mother metals 71 to be welded is single V-structure to the groove of comparative example 2, and be provided with root face 72 bottom groove, the angle [alpha] of groove is 50 degree.This comparative example and embodiment two contrast.
The welding method of the groove of this comparative example:
(1) identical with the step (1) of the welding method of the groove of embodiment two;
(2) identical with the step (2) of the welding method of the groove of embodiment two;
(3) first bottoming welding from the root face bottom groove, the parameter of bottoming welding is identical with the parameter that the bottoming of the step (3) of the welding method of the groove of embodiment two is welded;
(4) multilayer fills welding, and the parameter of filling welding is identical with the parameter that the filling of the step (3) of the welding method of the groove of embodiment two is welded;
(5) cover welding is until complete welding, and the parameter of cover welding is identical with the parameter of the cover welding in the step (5) of the welding method of the groove of embodiment two.
The welding deformation having welded rear measurement mother metal is 15 °.
Comparative example 3:
As shown in Figure 2, the groove between two mother metals 61 to be welded is double V-shaped structure to the groove of this comparative example, and be provided with root face 62 bottom groove, the angle [alpha] on groove top is 60 degree, and the angle beta of groove bottom is 70 degree; This comparative example and embodiment three contrast.
The welding method of the groove of this comparative example:
(1) identical with the step (1) of the welding method of the groove of embodiment three;
(2) identical with the step (2) of the welding method of the groove of embodiment three;
(3) first bottoming welding from the root face bottom groove, the parameter of bottoming welding is identical with the parameter that the bottoming of the step (3) of the welding method of the groove of embodiment three is welded;
(4) multilayer fills welding, and the parameter of filling welding is identical with the parameter that the filling of the step (3) of the welding method of the groove of embodiment three is welded;
(5) cover welding is until complete welding, and the parameter of cover welding is identical with the parameter of the cover welding in the step (5) of the welding method of the groove of embodiment three.
The welding deformation having welded rear measurement mother metal is 19 °.
Comparative example 4:
As shown in Figure 2, the groove between two mother metals 61 to be welded is double V-shaped structure to the groove of this comparative example, and be provided with root face 62 bottom groove, the angle [alpha] on groove top is 70 degree, and the angle beta of groove bottom is 80 degree; This comparative example and embodiment four contrast.
The welding method of the groove of this comparative example:
(1) identical with the step (1) of the welding method of the groove of embodiment four;
(2) identical with the step (2) of the welding method of the groove of embodiment four;
(3) first bottoming welding from the root face bottom groove, the parameter of bottoming welding is identical with the parameter that the bottoming of the step (3) of the welding method of the groove of embodiment four is welded;
(4) multilayer fills welding, and the parameter of filling welding is identical with the parameter that the filling of the step (3) of the welding method of the groove of embodiment four is welded;
(5) cover welding is until complete welding, and the parameter of cover welding is identical with the parameter of the cover welding in the step (5) of the welding method of the groove of embodiment four.
The welding deformation having welded rear measurement mother metal is 18 °.
Table 1 is below the Data Comparison to adopting the groove type of embodiment one to four with the welding deformation of the groove type mother metal of employing comparative example 1 to 4.
Table 1
| Groove type | Welding deformation | Groove type | Welding deformation |
| Comparative example 1 | 13° | Embodiment one | 2° |
| Comparative example 2 | 15° | Embodiment two | 1° |
| Comparative example 3 | 19° | Embodiment three | 1° |
| Comparative example 4 | 18° | Embodiment four | 2° |
As can be seen from Table 1, when adopting groove type of the present invention, the welding deformation of mother metal is within the scope of 1 °-2 °, and when adopting the groove type of prior art, the welding deformation of mother metal is more than 13 °; Adopt groove type of the present invention during welding, the welding deformation of mother metal can be reduced.
Claims (4)
1. a bevel for welding for non-active steel containment vessel of nuclear power station, is characterized in that, this bevel for welding comprises two parts of the center line symmetry about mother metal, and these two parts are respectively V-structure; The group of described bevel for welding is 2-4.5 millimeter to gap.
2. the bevel for welding of non-active steel containment vessel of nuclear power station according to claim 1, is characterized in that, two parts of described bevel for welding are respectively single V-structure, and the angle of this single V-structure is 30-50 degree.
3. the bevel for welding of non-active steel containment vessel of nuclear power station according to claim 1, it is characterized in that, two parts of described bevel for welding are respectively double V-shaped structure, the angle of the V-type part of the center line of the close described mother metal of this double V-shaped structure is 25-30 degree, and the angle away from the V-type part of the center line of described mother metal is 15-20 degree; The junction of two V-type parts of described double V-shaped structure is 8-12 millimeter to the distance of the center line of mother metal.
4. the bevel for welding of non-active steel containment vessel of nuclear power station according to claim 1, is characterized in that, the thickness of described mother metal is 20-150 millimeter.
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| CN201410806180.2A CN104625459A (en) | 2014-12-19 | 2014-12-19 | Welding groove of passive nuclear power plant steel containment |
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Cited By (1)
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| CN114654054A (en) * | 2020-12-23 | 2022-06-24 | 中国核工业二三建设有限公司 | Automatic welding method for nuclear power passive containment cooling auxiliary water tank |
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