CN104551357A - Welding method for welding steel containment vessel of passive nuclear power plant - Google Patents
Welding method for welding steel containment vessel of passive nuclear power plant Download PDFInfo
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- CN104551357A CN104551357A CN201410802254.5A CN201410802254A CN104551357A CN 104551357 A CN104551357 A CN 104551357A CN 201410802254 A CN201410802254 A CN 201410802254A CN 104551357 A CN104551357 A CN 104551357A
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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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
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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
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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
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/022—Welding by making use of electrode vibrations
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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
- B23K9/00—Arc welding or cutting
- B23K9/095—Monitoring or automatic control of welding parameters
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Abstract
The invention belongs to the technical field of metal welding and provides a welding method for welding a steel containment vessel of a passive nuclear power plant. The welding method is used for solving the problem of the current steel containment vessel welding methods that welding deformation is easily caused. The method comprises the steps: (1) forming a bevel in base metal; (2) preheating the base metal; (3) carrying out spot welding on the base metal by adopting manual or automatic welding; (4) alternately welding the upper and lower parts of the bevel until bevel welding is completed. By using the welding method provided by the invention, the base metal cannot be subjected to welding deformation during the welding of the steel containment vessel, and the quality of welding is improved.
Description
Technical field
The invention belongs to the technical field of metal solder, being specifically related to a kind of welding method for welding 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, root face 62 is provided with bottom groove, first bottoming welding from the root face bottom groove during welding, multilayer fills welding again, 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 welding method for welding non-active steel containment vessel of nuclear power station, to avoid producing welding deformation, improves welding quality.
Welding method of the present invention comprises the following steps:
(1) to mother metal bevel, this groove comprises upper and lower; The upper and lower of described groove is respectively V-structure, and the upper and lower of described groove is symmetrical about the center line of mother metal; The group of described groove is 2-4.5 millimeter to gap;
(2) to mother metal preheating;
(3) adopt manual welding or automatic welding, spot welding is carried out to mother metal;
(4) hocketed welding in the upper and lower of described groove, until groove welding completes.
Wherein, in described step (4), to the upper and lower of described groove hocket welding process be:
(1) to the top bottoming welding of groove, then welding is partially filled to this, fills layer 2-3;
(2) to the bottom bottoming welding of groove, then welding is partially filled to this, fills layer 2-3;
(3) continue to fill welding, until the cover welding of this part completes to groove top;
(4) continue to fill welding, until the cover welding of this part completes to groove bottom.
Wherein, in described step (4), to the upper and lower of described groove hocket welding process be:
(1) to the top bottoming welding of groove, then welding is partially filled to this, fills layer 2-3;
(2) to the bottom bottoming welding of groove, then welding is partially filled to this, fills layer 2-3;
(3) continue to fill welding to groove top, fill layer 2-3, then continue to fill welding to groove bottom, fill layer 2-3, repeat this step, until the cover welding of the upper and lower of groove completes.
Wherein, in described step (3), automatic welding is adopted 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.
Wherein, 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; 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; The welding parameter of cover welding is: 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.
Wherein, in filling welding process, 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.
Wherein, the upper and lower of described groove is respectively single V-structure, and the angle of this single V-structure is 30-50 degree.
Wherein, the upper and lower of described groove is 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 beneficial effect of welding method of the present invention: in prior art, the bottom of groove is provided with root face, first bottoming welding from the root face bottom groove during welding, multilayer fills welding again, finally carry out cover welding, namely upwards in layer weld bottom groove, in welding process, the wlding of fusing makes two mother metals adjacent to each other to the pulling force of mother metal always, after causing welding to complete, easily there is welding deformation in mother metal; And welding method of the present invention, first to mother metal bevel, this groove comprises the upper and lower of the center line symmetry about mother metal, then welds.During welding, first to the top bottoming welding of groove, then can fill welding, fill layer 2-3; Again to the bottom bottoming welding of groove, then fill welding, fill layer 2-3; Continue to fill welding, until capping completes the welding of this part to the top of groove again; Finally to the under-filled welding of groove, until capping completes the welding of this part; Also first to the top bottoming welding of groove, then welding can be partially filled to this, fill layer 2-3; Again to the bottom bottoming welding of groove, then welding is partially filled to this, fills layer 2-3; Continue to fill welding to groove top again, fill layer 2-3, then continue to fill welding to groove bottom, fill layer 2-3, repeat this step, until the cover welding of the upper and lower on slope completes.In welding process, welding method of the present invention to hocket welding to the upper and lower of 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 with a kind of bevel for welding corresponding for the welding method of welding non-active steel containment vessel of nuclear power station of the present invention;
Fig. 4 is the structural representation with the another kind of bevel for welding corresponding for the welding method of welding non-active steel containment vessel of nuclear power station of the present invention;
Fig. 5 is the schematic diagram of the welding method for welding 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
Introduce welding method of the present invention below in conjunction with Fig. 3-Fig. 6, wherein, in Fig. 3, arrow direction is upper.
The embodiment one of welding method of the present invention:
(1) to mother metal bevel, as shown in Figure 3, bevel for welding 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.
(2) use electric heating sheets to mother metal 230 preheating, preheat temperature is 100 DEG C;
(3) manual welding is adopted to carry out spot welding to mother metal 230; The welding parameter adopting manual welding to carry out spot welding is: every section of spot welded joint grows 100 millimeters, spot welded joint apart 500 millimeters, electric current 130A, voltage 18V, speed of welding 1.5inch/min, amplitude of fluctuation 10mm, swing speed 6Hz (hertz).
(4) as shown in Figure 5, to the top bottoming welding welding bead 1 of groove, the welding parameter of bottoming welding is: electric current 110A, voltage 20V, speed of welding 3.0inch/min, wire feed rate 140inch/min, amplitude of fluctuation 10mm, swing speed 8Hz, shield gas flow rate 20L/min; Then fill the two-layer welding bead of welding, welding bead 2 and welding bead 3, the welding parameter of filling welding is: electric current 120A, voltage 20V, speed of welding 2.0inch/min, wire feed rate 130inch/min, amplitude of fluctuation 14mm, swing speed 7Hz, shield gas flow rate 24L/min.
(5) 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 (4) 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 (4).
(6) fill welding to groove top, until capping completes the welding of this part, wherein, the welding parameter of filling welding is identical with filling the parameter of welding in step (4); The welding parameter of cover welding is: electric current 120A, voltage 22V, speed of welding 2.0inch/min, wire feed rate 120inch/min, amplitude of fluctuation 20mm, swing speed 5Hz, shield gas flow rate 30L/min.
(7) welding parameter of to the under-filled welding of groove, until capping completes the welding of this part, wherein, filling welding is identical with filling the parameter of welding in step (4); The welding parameter of cover welding is identical with the parameter of cover welding in step (6).
In the filling welding process of step (4)-step (7), use vernier caliper measurement weld width, 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.
The embodiment two of welding method of the present invention:
(1) to mother metal bevel, as shown in Figure 3, bevel for welding 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 2.5 millimeters to gap L.
(2) use electric heating sheets to mother metal 230 preheating, preheat temperature is 140 DEG C;
(3) manual welding is adopted to carry out spot welding to mother metal 230; Adopt the welding parameter of manual welding spot welding: every section of spot welded joint grows 100 millimeters, spot welded joint 650 millimeters, electric current 140A, voltage 25V, speed of welding 3.0inch/min, amplitude of fluctuation 15mm, swing speed 6Hz apart.
(4) to the top bottoming welding welding bead 1 of groove, the welding parameter of bottoming welding is: electric current 125A, voltage 25V, speed of welding 5.0inch/min, wire feed rate 155inch/min, amplitude of fluctuation 15mm, swing speed 8Hz, shield gas flow rate 25L/min; Then fill welding three layers of welding bead, welding bead 2, welding bead 3 and welding bead 8, the welding parameter of filling welding is: electric current 130A; voltage 25V, speed of welding 4.5inch/min, wire feed rate 155inch/min; amplitude of fluctuation 17mm, swing speed 7Hz, shield gas flow rate 32L/min.
(5) 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 (4) 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 (4).
(6) welding is filled to groove top; until capping completes the welding of this part; wherein, the welding parameter of filling welding is identical with filling the parameter of welding in step (4), and the welding parameter of cover welding is: electric current 127A; voltage 24V; speed of welding 4.5inch/min, wire feed rate 140inch/min, amplitude of fluctuation 22mm; swing speed 7Hz, shield gas flow rate 35L/min.
(7) to the under-filled welding of groove, until capping completes the welding of this part, wherein, the welding parameter of filling welding is identical with filling the parameter of welding in step (4), and the welding parameter of cover welding is identical with the parameter of cover welding in step (6).
In the filling welding process of step (4)-step (7), use vernier caliper measurement weld width, 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.
The welding deformation having welded rear measurement mother metal is 1 °.
The embodiment three of welding method of the present invention:
(1) to mother metal bevel, as shown in Figure 4, bevel for welding 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 3.5 millimeters to gap L.
(2) use electric heating sheets to mother metal 230 preheating, preheat temperature is 180 DEG C;
(3) adopt automatic welding, spot welding is carried out to mother metal 230; Adopt the welding parameter of automatic welding spot welding: electric current 160A, voltage 28V, speed of welding 3.0inch/min, wire feed rate 170inch/min, amplitude of fluctuation 20mm, swing speed 8Hz, shield gas flow rate 30L/min.
(4) to the top bottoming welding welding bead 1 of groove, the welding parameter of bottoming welding is: electric current 140A, voltage 30V, speed of welding 8.0inch/min, wire feed rate 170inch/min, amplitude of fluctuation 20mm, swing speed 8Hz, shield gas flow rate 30L/min; Then fill the two-layer welding bead of welding, welding bead 2 and welding bead 3, the welding parameter of filling welding is: electric current 140A, voltage 30V, speed of welding 7.0inch/min, wire feed rate 180inch/min, amplitude of fluctuation 21mm, swing speed 7Hz, shield gas flow rate 40L/min.
(5) 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 (4) 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 (4).
(6) welding is filled to groove top; until capping completes the welding of this part; wherein, the welding parameter of filling welding is identical with filling the parameter of welding in step (4), and the welding parameter of cover welding is: electric current 135A; voltage 26V; speed of welding 7.5inch/min, wire feed rate 160inch/min, amplitude of fluctuation 25mm; swing speed 10Hz, shield gas flow rate 40L/min.
(7) to the under-filled welding of groove, until capping completes the welding of this part, wherein, the welding parameter of filling welding is identical with filling the parameter of welding in step (4), and the welding parameter of cover welding is identical with the parameter of cover welding in step (6).
In the filling welding process of described step (4)-step (7), use vernier caliper measurement weld width, 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.
The welding deformation having welded rear measurement mother metal is 2 °.
Embodiment four:
(1) to mother metal bevel, as shown in Figure 4, bevel for welding 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.
(2) to mother metal preheating, preheat temperature is 140 DEG C;
(3) adopt 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 140A, voltage 24V, speed of welding 2.0inch/min, wire feed rate 155inch/min, amplitude of fluctuation 15mm, swing speed 8Hz, shield gas flow rate 25L/min.
(4) to the top bottoming welding welding bead 1 of groove, the welding parameter of bottoming welding is: electric current 130A, voltage 25V, speed of welding 5.0inch/min, wire feed rate 160inch/min, amplitude of fluctuation 15mm, swing speed 8Hz, shield gas flow rate 25L/min; Then fill the two-layer welding bead of welding, welding bead 2 and welding bead 3, the welding parameter of filling welding is: electric current 133A, voltage 24V, speed of welding 4.0inch/min, wire feed rate 161inch/min, amplitude of fluctuation 17mm, swing speed 7Hz, shield gas flow rate 32L/min.
(5) to the bottom bottoming welding welding bead 4 of groove, welding parameter is identical with the parameter that bottoming in step (4) is welded; Then fill welding welding bead 5, welding bead 6 and welding bead 7, welding parameter is identical with filling the parameter of welding in step (4).
(6) continue to fill welding to groove top, fill layer 2-3, welding parameter is identical with filling the parameter of welding in step (4); Then continue to fill welding to groove bottom, fill layer 2-3, welding parameter is identical with filling the parameter of welding in step (4); Repeat this step, until the upper and lower cover welding of groove completed, the parameter of cover welding is: electric current 130A; voltage 23V, speed of welding 5.5inch/min, wire feed rate 135inch/min; amplitude of fluctuation 21mm, swing speed 6Hz, shield gas flow rate 31L/min.
The welding deformation having welded rear measurement mother metal is 2 °.
In welding process, welding method of the present invention to hocket welding to the upper and lower of 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.
Comparative example 1:
(1) to mother metal bevel, as shown in Figure 6, the groove between two mother metals 71 to be welded is single V-structure to groove, and be provided with root face 72 bottom groove, the angle [alpha] of groove is 50 degree.
(2) identical with the step (2) of embodiment two, use electric heating sheets to mother metal preheating, preheat temperature is 140 DEG C;
(3) identical with the step (3) of embodiment two;
(4) first bottoming welding from the root face bottom groove, the parameter of bottoming welding is identical with the parameter that bottoming in the step (4) of embodiment two is welded;
(5) multilayer fills welding, and the middle parameter of welding of filling of step (4) of filling parameter and the embodiment two of welding is identical;
(6) cover welding is until complete welding, and the parameter of cover welding is identical with the parameter of cover welding in the step (6) of embodiment two.
The welding deformation having welded rear measurement mother metal is 13 °.
Comparative example 2:
(1) to mother metal bevel, as shown in Figure 2, the groove between two mother metals 61 to be welded is double V-shaped structure to groove, and be provided with root face 62 bottom groove, the angle [alpha] on groove top is 15 degree, and the angle beta of groove bottom is 25 degree;
(2) identical with the step (2) of embodiment three, use electric heating sheets to mother metal preheating, preheat temperature is 180 DEG C;
(3) identical with the step (3) of embodiment three;
(4) first bottoming welding from the root face bottom groove, the parameter of bottoming welding is identical with the parameter that bottoming in the step (4) of embodiment three is welded;
(5) multilayer fills welding, and the middle parameter of welding of filling of step (4) of filling parameter and the embodiment three of welding is identical;
(6) cover welding is until complete welding, and the parameter of cover welding is identical with the parameter of cover welding in the step (6) of embodiment three.
The welding deformation having welded rear measurement mother metal is 16 °.
Comparative example 3:
(1) to mother metal bevel, as shown in Figure 2, the groove between two mother metals 61 to be welded is double V-shaped structure to groove, and be provided with root face 62 bottom groove, the angle [alpha] on groove top is 20 degree, and the angle beta of groove bottom is 30 degree;
(2) identical with the step (2) of embodiment four, use electric heating sheets to mother metal preheating, preheat temperature is 140 DEG C;
(3) identical with the step (3) of embodiment four;
(4) first bottoming welding from the root face bottom groove, the parameter of bottoming welding is identical with the parameter that bottoming in the step (4) of embodiment four is welded;
(5) multilayer fills welding, and the middle parameter of welding of filling of step (4) of filling parameter and the embodiment four of welding is identical;
(6) cover welding is until complete welding, and the parameter of cover welding is identical with the parameter of cover welding in the step (6) of embodiment four.
The welding deformation having welded rear measurement mother metal is 18 °.
Table 1 is below the Data Comparison to adopting the welding method of embodiment two to four with the welding deformation of the welding method mother metal of employing comparative example 1 to 3.
Table 1
| Welding method | Welding deformation | Welding method | Welding deformation |
| Comparative example 1 | 13° | Embodiment two | 1° |
| Comparative example 2 | 16° | Embodiment three | 2° |
| Comparative example 3 | 18° | Embodiment four | 2° |
Drawn by table 1, use method of the present invention to weld, the welding deformation of mother metal is at 1 °-2 °, and use the method for prior art to weld, the welding deformation of mother metal is more than 13 °; Use method of the present invention to weld, decrease the welding deformation of mother metal.
Claims (8)
1., for welding a welding method for non-active steel containment vessel of nuclear power station, it is characterized in that, the method comprises the following steps:
(1) to mother metal bevel, this groove comprises upper and lower; The upper and lower of described groove is respectively V-structure, and the upper and lower of described groove is symmetrical about the center line of mother metal; The group of described groove is 2-4.5 millimeter to gap;
(2) to mother metal preheating;
(3) adopt manual welding or automatic welding, spot welding is carried out to mother metal;
(4) hocketed welding in the upper and lower of described groove, until groove welding completes.
2. the welding method for welding non-active steel containment vessel of nuclear power station according to claim 1, is characterized in that, in described step (4), to the upper and lower of described groove hocket welding process be:
(1) to the top bottoming welding of groove, then welding is partially filled to this, fills layer 2-3;
(2) to the bottom bottoming welding of groove, then welding is partially filled to this, fills layer 2-3;
(3) continue to fill welding, until the cover welding of this part completes to groove top;
(4) continue to fill welding, until the cover welding of this part completes to groove bottom.
3. the welding method for welding non-active steel containment vessel of nuclear power station according to claim 1, is characterized in that, in described step (4), to the upper and lower of described groove hocket welding process be:
(1) to the top bottoming welding of groove, then welding is partially filled to this, fills layer 2-3;
(2) to the bottom bottoming welding of groove, then welding is partially filled to this, fills layer 2-3;
(3) continue to fill welding to groove top, fill layer 2-3, then continue to fill welding to groove bottom, fill layer 2-3, repeat this step, until the cover welding of the upper and lower of groove completes.
4. the welding method for welding non-active steel containment vessel of nuclear power station according to claim 1, it is characterized in that, in described step (3), 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.
5. the welding method for welding non-active steel containment vessel of nuclear power station according to Claims 2 or 3, it is characterized in that, 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; 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; The welding parameter of cover welding is: 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. the welding method for welding non-active steel containment vessel of nuclear power station according to Claims 2 or 3, is characterized in that, in filling welding process, when weld width is 2-20 millimeter, adopts the welding of individual layer single track; When weld width is more than 20 millimeters, adopt the welding of pressure road.
7. the welding method for welding non-active steel containment vessel of nuclear power station according to any one of claim 1-4, it is characterized in that, the upper and lower of described groove is respectively single V-structure, and the angle of this single V-structure is 30-50 degree.
8. the welding method for welding non-active steel containment vessel of nuclear power station according to any one of claim 1-4, it is characterized in that, the upper and lower of described groove is 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.
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