CN110695563A - Welding method for tank wall plate of soil covering tank - Google Patents
Welding method for tank wall plate of soil covering tank Download PDFInfo
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- CN110695563A CN110695563A CN201910970028.0A CN201910970028A CN110695563A CN 110695563 A CN110695563 A CN 110695563A CN 201910970028 A CN201910970028 A CN 201910970028A CN 110695563 A CN110695563 A CN 110695563A
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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
- B23K9/16—Arc welding or cutting making use of shielding gas
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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
- B23K9/235—Preliminary treatment
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Abstract
The invention relates to a welding method of a tank wall plate of an earth covering tank, and belongs to the technical field of earth covering tanks. The welding method of the tank wall plate of the soil covering tank comprises the following steps: processing a double-V-shaped composite groove; adopting mixed gas shielded welding to perform horizontal welding and vertical up-welding of the tank wall plate; the protective gas is a mixed gas consisting of carbon dioxide and argon. The welding mode is combined with the double-V-shaped composite groove and the mixed gas, so that the filling amount of the welding seam is reduced, the welding efficiency is improved, and the comprehensive welding efficiency is improved by 30% on the premise of ensuring the quality of the welding seam, thereby reducing the welding construction cost. The angle of the lower-section groove is set to be 42.5-47.5 degrees, which is beneficial to fully melting the edge of the groove, avoiding the occurrence of incomplete fusion, ensuring the quality of a welding seam, and the angle of the upper-section groove surface is set to be 3.5-6.5 degrees, which is beneficial to reducing the filling amount and reducing the welding cost. The mixed gas is beneficial to obtaining larger fusion depth, can ensure thorough welding during bottoming, and simultaneously reduces welding spatter.
Description
Technical Field
The invention relates to a welding method of a tank wall plate of an earth covering tank, and belongs to the technical field of earth covering tanks.
Background
The earth-covering tank is a storage tank for storing crude oil and product oil, the construction requirement on the earth-covering tank is higher and higher at present, the operation space in the earth-covering tank is narrow and limited, the construction difficulty is high in the limited space, the technical requirement is high, full-automatic submerged arc horizontal welding and gas-electric vertical welding cannot be used due to the limited operation space, most of pipe wall welding of the earth-covering tank adopts welding rod arc welding due to the limited conditions, the construction measures are old, the welding is performed in the limited space, the ventilation is not smooth, smoke and dust are large, the welding environment is poor, a carbon arc gouging plane is needed to be adopted for back gouging, the construction efficiency is influenced, the noise is large, the operation environment is poor, in addition, the using amount of welding materials is large, the welding time is long, the welding cost is high, the construction efficiency is lower, and the.
Disclosure of Invention
The invention aims to provide a welding method of a tank wall plate of an earth covering tank, which is used for welding the tank wall plate of the earth covering tank, is beneficial to saving welding materials, reducing cost and ensuring welding quality.
The technical scheme of the invention is as follows:
(1) processing a double-V-shaped composite groove on a tank wall plate;
the double-V-shaped composite groove comprises a truncated edge, a lower-section groove and an upper-section groove, wherein a groove inflection point is arranged at the joint of the lower-section groove and the upper-section groove, the groove angle of the lower-section groove is 42.5-47.5 degrees, the groove surface angle of the upper-section groove is 3.5-6.5 degrees, the length of the truncated edge is 0.5-1.5 mm, and the distance between the groove inflection point and the bottom edge of a tank wall plate is 4-6 mm;
(2) adopting mixed gas shielded welding to perform horizontal welding and vertical up-welding of the tank wall plate;
the shielding gas adopted by the mixed gas shielded welding is a mixed gas consisting of 75-85 vol% of carbon dioxide and 15-25 vol% of argon.
It can be understood that after the double-V-shaped composite groove is processed on the tank wall plate, the cut surface of the groove is smooth by grinding. So that the groove and the inner and outer surfaces of the tank wall plate within 50mm from the groove are free of rust, burrs and the like.
The blunt edge refers to the straight edge part of the end face along the root part of the welding part joint bevel when the welding part is beveled.
The bevel angle refers to the included angle between the two bevel surfaces.
The bevel face angle refers to an included angle between the end face of the groove to be machined and the bevel face.
The lower groove is adjacent to the truncated edge, and the lower groove is adjacent to the upper groove.
The bottom of the small end of the double V-shaped composite groove refers to the end close to the blunt edge.
The distance between the turning point of the groove and the bottom edge of the tank wall plate refers to the side of the tank wall plate vertically connected with the blunt edge.
According to the welding method of the tank wall plate of the soil covering tank, the tank wall plate is transversely welded and vertically welded in a mixed gas shielded welding mode, the welding mode is combined with a specific double-V-shaped composite groove (the groove angle of a lower groove is 42.5-47.5 degrees, the groove surface angle of an upper groove is 3.5-6.5 degrees, the length of a truncated edge is 0.5-1.5 mm, the distance between the inflection point of the groove and the bottom edge of the tank wall plate is 4-6 mm) and specific mixed gas, the filling amount of a welding seam can be reduced on the premise of ensuring the quality of the welding seam, the welding efficiency is improved, the comprehensive welding work efficiency is improved by 30%, and the welding construction cost is reduced.
In the welding method of the tank wall plate of the soil covering tank, the groove angle of the groove at the lower section is set to be 42.5-47.5 degrees, so that the mixed gas shielded welding is facilitated to ensure that a contact tip of a welding gun can extend to the bottom of the groove when horizontal welding and vertical up-welding are carried out, the dry extension of a welding wire can be shorter, and the welding wire can be well protected by the shielding gas during welding; and the groove can swing when the lower-section groove is welded, the edge of the groove is fully melted, the incomplete fusion is avoided, the quality of a welding seam is ensured, the angle of the bevel face of the upper-section groove is set to be 3.5-6.5 degrees, the size of the groove is reduced, the filling amount is reduced, and the welding cost is reduced. In addition, when the tank wall plate is transversely welded and vertically welded, the adopted gas is mixed gas consisting of 75 vol% -85 vol% of carbon dioxide and 15 vol% -25 vol% of argon, the 75 vol% -85 vol% of carbon dioxide is favorable for obtaining larger fusion depth, the full penetration during bottoming is ensured, and the 15 vol% -25 vol% of argon is favorable for reducing welding spatter.
The method comprises the steps of firstly processing a double-V-shaped composite groove on a tank wall plate, and then performing transverse welding and vertical welding on the tank wall plate by adopting mixed gas shielded welding. The double-V-shaped composite groove is a narrow-gap double-V-shaped composite groove, the filling material in a welding seam is less, the cost is reduced, the welding time is shortened, the groove of the double-V-shaped composite groove has good weldability, the welding quality is ensured, and in addition, the groove shape of the double-V-shaped composite groove is easy to process; the adopted mixed gas shielded welding can effectively improve the welding efficiency, has small splashing and small labor intensity of an electric welder. The method greatly improves the welding efficiency, reduces the welding cost, improves the working environment, is suitable for the construction of the tank wall plate of the soil covering tank, and solves the welding problem of the soil covering tank.
The method is used for performing horizontal welding and vertical welding on the tank wall plate, and the mixed gas shielded welding equipment for the horizontal welding and the vertical welding is simple and low in cost.
In order to further ensure the welding quality and reduce the consumption of welding materials and the cost, preferably, in the step (1), the angle of the groove of the lower groove is 45 degrees, the angle of the bevel face of the upper groove is 5 degrees, the length of the truncated edge is 1mm, and the distance from the inflection point of the groove to the bottom edge of the tank wall plate is 5 mm.
Preferably, in the step (1), the assembling process parameters of the double V-shaped composite groove are as follows: the gap of the root of the groove is 2-2.5 mm, and the misalignment is less than 1.5 mm. The gap between the root parts of the grooves is 2-2.5 mm, so that the root penetration is guaranteed. The misalignment is less than 1.5mm, which is beneficial to the assembly of the double V-shaped composite groove.
In order to ensure the machining precision, in step (1), the machining method for machining the double-V composite groove is preferably mechanical cold machining.
Preferably, in the step (1), the thickness of the tank wall plate is 12-30 mm. The welding method of the tank wall plate of the soil covering tank is suitable for tank wall plates with the thickness of 12-30 mm.
Preferably, in the step (2), during welding, the priming layer, the filling layer and the cover surface layer are welded in sequence from the bottom of the small end of the double-V-shaped composite groove; the welding current that welding priming layer adopted is 90 ~ 130A, the welding current that welding filling layer adopted is 180 ~ 200A, the welding current that welding capping layer adopted is 180 ~ 200A. Under the condition of the welding current, the mode of welding the priming layer, the filling layer and the cover surface layer in sequence is favorable for obtaining well-formed transverse welding seams and vertical welding seams.
Preferably, the inter-track temperature of the weld is 150 ℃ or less.
In order to ensure root penetration, avoid back carbon arc gouging back chipping, improve welding efficiency, improve operating environment and shorten construction time, preferably, the forming technology adopted by the welding backing layer is a single-side welding double-side forming technology.
In order to further ensure that the priming layer, the filling layer and the cover surface layer are well formed, preferably, the welding priming layer adopts the following process parameters: the welding current is 90-130A, the voltage is 18-20V, the diameter of a welding wire is 1.2mm, the welding speed is 16-22 cm/min, the wire feeding speed is 80-110 in/min, the elongation of the welding wire is 8-12 mm, and the gas flow is 20-30L/min; the welding filling layer adopts the following technological parameters: the welding current is 180-200A, the voltage is 23-26V, the diameter of a welding wire is 1.2mm, the welding speed is 18-22 cm/min, the wire feeding speed is 90-110 in/min, the elongation of the welding wire is 8-12 mm, and the gas flow is 20-30L/min; the welding cover surface layer adopts the following technological parameters: the welding current is 180-200A, the voltage is 23-26V, the diameter of a welding wire is 1.2mm, the welding speed is 14-20 cm/min, the wire feeding speed is 80-100 in/min, the elongation of the welding wire is 8-12 mm, and the gas flow is 20-30L/min.
In order to further reduce spatter while ensuring penetration, it is preferable that the shielding gas used in the mixed gas shielded welding in step (2) is a mixed gas of 80 vol% of carbon dioxide and 20 vol% of argon gas.
Drawings
Fig. 1 is a schematic view of a double V-shaped compound groove of example 1.
Detailed Description
The present invention will be further described with reference to the following embodiments.
In the welding method of the wall plate of the earth covering tank of the embodiment of the invention, the wall plate can adopt steel plates made of materials such as Q245R, Q345R and the like. The thickness of the tank wall plate is 12-30 cm.
In the welding method of the wall plate of the soil covering tank, the welding wire for mixed gas shielded welding adopts a solid welding wire.
In the welding method of the tank wall plate of the soil covering tank provided by the embodiment of the invention, the tank wall plate is assembled by adopting a flip-chip method.
The raw materials such as the plate material, the welding material and the like used in the embodiment of the invention must have the ex-factory qualification certificate and the material quality certificate. The appearance of the steel plate has no defects of cracks, slag inclusion, pockmarks, mechanical damage and the like.
The concrete embodiment of the welding method of the tank wall plate of the soil covering tank of the invention is as follows:
example 1
The welding method of the wall plates of the soil covering tank comprises the following steps:
(1) double V-shaped composite groove
The tank wall plate is made of a steel plate made of Q245R, and the thickness of the steel plate is 20 cm.
And a double-V-shaped composite groove is machined on the tank wall plate by adopting mechanical cold cutting so as to ensure the machining precision. And (4) polishing the groove and the surface layers of the steel pipe, wherein the surface layers affect the welding quality, such as iron rust, burrs and the like within a range of 50mm from the groove to the inner surface and the outer surface of the steel pipe.
The schematic diagram of the double-V-shaped composite groove is shown in FIG. 1, the groove angle alpha of the lower-section groove is 45 degrees, the groove surface angle beta of the upper-section groove is 5 degrees, the truncated edge P is 1mm, and the distance H from the corner of the groove to the bottom edge of the tank wall plate is 5 mm.
(2) Assembly of double V-shaped composite groove
The tank wall plates are assembled by adopting a flip-chip method, the gap of the root part of the groove is 2.2mm, and the misalignment is less than 1.5 mm.
(3) Welding primer layer
The bottoming layer is welded by adopting mixed gas shielded welding, the single-side welding and double-side forming technology is adopted for the bottoming layer, the thickness of a welding layer of the bottoming layer is 2mm, a solid welding wire is adopted for the welding wire, and the mixed gas consisting of 80 vol% of carbon dioxide and 20 vol% of argon is adopted as the protective gas.
The welding priming coat adopts the following technological parameters: the welding current is 110A, the voltage is 19V, the diameter of a welding wire (the mark is ER50-G) is 1.2mm, the welding speed is 16cm/min, the wire feeding speed is 80in/min, the elongation of the welding wire is 8mm, the gas flow is 20L/min, and the welding power supply is reversely connected.
(4) Solder fill
And welding the filling layer by adopting mixed gas shielded welding, wherein the thickness of each layer of the filling layer is 2.2mm, the welding wire adopts a solid welding wire, and the shielding gas adopts mixed gas consisting of 80 vol% of carbon dioxide and 20 vol% of argon.
The technological parameters adopted for welding the filling layer are as follows: the welding current is 190A, the voltage is 24V, the diameter of a welding wire (the mark is ER50-G) is 1.2mm, the welding speed is 18cm/min, the wire feeding speed is 90in/min, the elongation of the welding wire is 8mm, the gas flow is 20L/min, the temperature between welding time channels is controlled to be less than 150 ℃, and the welding power supply is reversely connected.
(5) Welding cover layer
The cover surface layer is welded by adopting mixed gas shielded welding, the thickness of a welding layer of the cover surface layer is 2.5mm, the welding wire adopts a solid welding wire, and the shielding gas adopts mixed gas consisting of 80 vol% of carbon dioxide and 20 vol% of argon.
The technological parameters adopted for welding the cover surface layer are as follows: the welding current is 190A, the voltage is 24V, the diameter of a welding wire (the mark is ER50-G) is 1.2mm, the welding speed is 14cm/min, the wire feeding speed is 80in/min, the elongation of the welding wire is 8mm, the gas flow is 20L/min, the temperature between welding time channels is controlled to be less than 150 ℃, and the welding power supply is reversely connected.
Example 2
The welding method of the wall plates of the soil covering tank comprises the following steps:
(1) double V-shaped composite groove
The tank wall panels were as in example 1.
And a double-V-shaped composite groove is machined on the tank wall plate by adopting mechanical cold cutting so as to ensure the machining precision. And (4) polishing the groove and the surface layers of the steel pipe, wherein the surface layers affect the welding quality, such as iron rust, burrs and the like within a range of 50mm from the groove to the inner surface and the outer surface of the steel pipe.
In the double-V-shaped composite groove, the groove angle alpha of the lower-section groove is 42.5 degrees, the groove surface angle beta of the upper-section groove is 3.5 degrees, the truncated edge P is 0.5mm, and the distance H from the inflection point of the groove to the bottom edge of the tank wall plate is 4 mm.
(2) Assembly of double V-shaped composite groove
The tank wall plates are assembled by adopting a flip-chip method, the gap of the root part of the groove is 2mm, and the misalignment is less than 1.5 mm.
(3) Welding primer layer
The bottoming layer is welded by adopting mixed gas shielded welding, the single-side welding and double-side forming technology is adopted for the bottoming layer, the thickness of a welding layer of the bottoming layer is 2mm, a solid welding wire is adopted for the welding wire, and the mixed gas consisting of 80 vol% of carbon dioxide and 20 vol% of argon is adopted as the protective gas.
The welding priming coat adopts the following technological parameters: the welding current is 130A, the voltage is 18V, the diameter of a welding wire (the mark is ER50-G) is 1.2mm, the welding speed is 19cm/min, the wire feeding speed is 100in/min, the elongation of the welding wire is 8mm, the gas flow is 20L/min, and the welding power supply is reversely connected.
(4) Solder fill
And welding the filling layer by adopting mixed gas shielded welding, wherein the thickness of each layer of the filling layer is 2.5mm, the welding wire adopts a solid welding wire, and the shielding gas adopts mixed gas consisting of 80 vol% of carbon dioxide and 20 vol% of argon.
The technological parameters adopted for welding the filling layer are as follows: the welding current is 180A, the voltage is 26V, the diameter of a welding wire (the mark is ER50-G) is 1.2mm, the welding speed is 20cm/min, the wire feeding speed is 100in/min, the elongation of the welding wire is 12mm, the gas flow is 30L/min, the temperature between welding time channels is controlled to be less than 150 ℃, and the welding power supply is reversely connected.
(5) Welding cover layer
Adopt the mist shielded welding facing layer, the layer thickness of facing layer is 2mm, and the welding wire adopts solid core welding wire, and shielding gas adopts the mist that 80 vol% carbon dioxide and 20 vol% argon gas are constituteed.
The technological parameters adopted for welding the cover surface layer are as follows: the welding current is 200A, the voltage is 26V, the diameter of a welding wire (the mark is ER50-G) is 1.2mm, the welding speed is 15cm/min, the wire feeding speed is 90in/min, the elongation of the welding wire is 12mm, the gas flow is 30L/min, the temperature between welding time channels is controlled to be less than 150 ℃, and the welding power supply is reversely connected.
Example 3
The welding method of the wall plates of the soil covering tank comprises the following steps:
(1) double V-shaped composite groove
The tank wall panels were as in example 1.
And a double-V-shaped composite groove is machined on the tank wall plate by adopting mechanical cold cutting so as to ensure the machining precision. And (4) polishing the groove and the surface layers of the steel pipe, wherein the surface layers affect the welding quality, such as iron rust, burrs and the like within a range of 50mm from the groove to the inner surface and the outer surface of the steel pipe.
In the double-V-shaped composite groove, the groove angle alpha of the lower groove is 47.5 degrees, the groove surface angle beta of the upper groove is 6.5 degrees, the truncated edge P is 1.5mm, and the distance H from the inflection point of the groove to the bottom edge of the tank wall plate is 6 mm.
(2) Assembly of double V-shaped composite groove
The tank wall plates are assembled by adopting a flip-chip method, the gap of the root part of the groove is 2.5mm, and the misalignment is less than 1.5 mm.
(3) Welding primer layer
The bottoming layer is welded by adopting mixed gas shielded welding, the single-side welding and double-side forming technology is adopted for the bottoming layer, the thickness of a welding layer of the bottoming layer is 2mm, a solid welding wire is adopted for the welding wire, and the mixed gas consisting of 80 vol% of carbon dioxide and 20 vol% of argon is adopted as the protective gas.
The welding priming coat adopts the following technological parameters: the welding current is 90A, the voltage is 20V, the diameter of a welding wire (the mark is ER50-G) is 1.2mm, the welding speed is 22cm/min, the wire feeding speed is 110in/min, the elongation of the welding wire is 12mm, the gas flow is 30L/min, and the welding power supply is reversely connected.
(4) Solder fill
And welding the filling layer by adopting mixed gas shielded welding, wherein the thickness of each layer of the filling layer is 2mm, the welding wire adopts a solid welding wire, and the protective gas adopts mixed gas consisting of 80 vol% of carbon dioxide and 20 vol% of argon.
The technological parameters adopted for welding the filling layer are as follows: the welding current is 200A, the voltage is 23V, the diameter of a welding wire (the mark is ER50-G) is 1.2mm, the welding speed is 22cm/min, the wire feeding speed is 110in/min, the elongation of the welding wire is 8mm, the gas flow is 20L/min, the temperature between welding time channels is controlled to be less than 150 ℃, and the welding power supply is reversely connected.
(5) Welding cover layer
Adopt the mist shielded welding facing layer, the layer thickness of facing layer is 3mm, and the welding wire adopts solid core welding wire, and shielding gas adopts the mist that 80 vol% carbon dioxide and 20 vol% argon gas are constituteed.
The technological parameters adopted for welding the cover surface layer are as follows: the welding current is 180A, the voltage is 23V, the diameter of a welding wire (the mark is ER50-G) is 1.2mm, the welding speed is 20cm/min, the wire feeding speed is 100in/min, the elongation of the welding wire is 8mm, the gas flow is 20L/min, the temperature between welding time channels is controlled to be less than 150 ℃, and the welding power supply is reversely connected.
Second, related test example
Test example 1
(1) RT-ray flaw detection
And (3) flaw detection is carried out on the tank wall plates welded by the welding method of the soil covering tank wall plates of the embodiments 1-3 by using RT rays, and all the tank wall plates are qualified.
(2) Tensile Properties
The double V-shaped composite grooves were formed by the welding method of the casing wall panels of the casing tanks of examples 1 and 2, and welded, and the mechanical properties of the welded joints were tested by a tensile test, and the results are shown in table 1.
The test method comprises the following steps: tensile test pieces were prepared according to NB/T47014 and tensile test was carried out according to GB/T228.
Table 1 tensile properties of can panels produced by the welding method of earth-covering can wall panels of examples 1 and 2
As can be seen from table 1, the maximum load that can be borne by the weld of the casing wall panels welded by the welding method of the casing wall panels of examples 1 and 2 is 129kN or more, the tensile strength is 535MPa or more, and the fracture mode of the weld is elongation fracture.
(3) Bending properties
The double V-shaped composite grooves were formed by the welding method of the casing wall panels of the casing tanks of examples 1 and 2, and welded, and the mechanical properties of the welded joints were tested by the bending test, and the results are shown in table 2.
The bending test method comprises the following steps: bending test pieces were prepared according to NB/T47014 and bending test was carried out according to GB/T2653.
Table 2 bending properties of can panels produced by the welding method of earth-covering can wall panels of examples 1 and 2
As can be seen from table 2, the wall plates of the soil covering tanks welded by the welding methods of the wall plates of the soil covering tanks of examples 1 and 2 were satisfactory in both the face bend and the back bend, the center of the bend was 48mm directly, and the bend angle was 180 °.
(4) Impact performance
The double V-shaped composite grooves were formed by the welding method of the casing wall panels of the casing tanks of examples 1 to 3, and welded, and the mechanical properties of the welded joints were tested by the impact test, and the results are shown in table 3.
The impact test method comprises the following steps: impact test pieces were prepared according to NB/T47014 and subjected to an impact test according to GB/T229.
TABLE 3 impact properties of can panels processed by the welding method for soil covering can panels of examples 1 to 3
As can be seen from table 3, the impact absorption power of the weld of the casing wall panels welded by the casing wall panel welding methods of examples 1 to 3 was 63J or more, and the impact absorption power of the heat affected zone was 119J or more.
(5) Welding efficiency
The results obtained comparing the welding efficiency of the conventional process and the welding efficiency of the new process comprising the welding method of the casing wall of the casing pot of example 1 of the present application are shown in table 4.
The conventional process welding adopts manual Shielded Metal Arc Welding (SMAW), the novel process welding adopts a mode of combining gas Shielded Metal Arc Welding (SMAW) and submerged automatic arc welding (SAM) in an application example 1 for welding a middle plate of a tank bottom plate, the manual Shielded Metal Arc Welding (SMAW) is adopted for welding a bottom plate edge plate and a large-angle welding seam of the tank, the gas Shielded Metal Arc Welding (SMAW) is adopted for welding a tank wall plate 2G, a tank wall plate 3G and a tank top plate in the application example 1, and the workload of each welding method in the same welding time of 8h is shown in a table 4.
TABLE 4 welding efficiency of different welding methods
As can be seen from Table 4, for the welding of the tank wall plate 2G and the tank wall plate 3G, the same number of welders can weld 50m in the same time by adopting the welding method of the embodiment 1, while only 30m is welded by adopting the traditional manual shielded metal arc welding, and the welding efficiency is improved by 66%; for the welding of the tank top plate, the same number of welders can weld 70m in the same time by adopting the welding method of the embodiment 1, while the welding efficiency is improved by 45 percent by adopting the traditional manual shielded metal arc welding to weld only 48 m; for the whole, under the condition of the same number of welders and the same welding time, the welding efficiency is improved by 30% by welding 320m by the new process and 246m by the traditional process. Therefore, by adopting the new process, the filling amount of the welding seam can be reduced on the premise of ensuring the quality of the welding seam, the welding efficiency is improved, and the comprehensive welding work efficiency is improved by 30 percent, so that the welding construction cost is reduced.
Claims (10)
1. A welding method for wall plates of an earth covering tank is characterized by comprising the following steps:
(1) processing a double-V-shaped composite groove on a tank wall plate;
the double-V-shaped composite groove comprises a truncated edge, a lower-section groove and an upper-section groove, wherein a groove inflection point is arranged at the joint of the lower-section groove and the upper-section groove, the groove angle of the lower-section groove is 42.5-47.5 degrees, the groove surface angle of the upper-section groove is 3.5-6.5 degrees, the length of the truncated edge is 0.5-1.5 mm, and the distance between the groove inflection point and the bottom edge of a tank wall plate is 4-6 mm;
(2) adopting mixed gas shielded welding to perform horizontal welding and vertical up-welding of the tank wall plate;
the shielding gas adopted by the mixed gas shielded welding is a mixed gas consisting of 75-85 vol% of carbon dioxide and 15-25 vol% of argon.
2. The welding method of the tank wall plate of the soil covering tank as described in claim 1, wherein in the step (1), the bevel angle of the lower groove is 45 °, the bevel face angle of the upper groove is 5 °, the length of the truncated edge is 1mm, and the distance from the corner point of the groove to the bottom edge of the tank wall plate is 5 mm.
3. The welding method of the wall plates of the soil covering tank of claim 1, wherein in the step (1), the assembling process parameters of the double V-shaped composite groove are as follows: the gap of the root of the groove is 2-2.5 mm, and the misalignment is less than 1.5 mm.
4. The method for welding the wall plates of the soil covering tank of claim 1, wherein in the step (1), the machining method for machining the double V-shaped composite groove is mechanical cold machining.
5. The method for welding the wall plates of the soil covering tank as claimed in claim 1, wherein in the step (1), the thickness of the tank wall plate is 12 to 30 mm.
6. The method for welding the wall plates of the soil covering tank as defined in any one of claims 1 to 5, wherein in the step (2), the primer layer, the filling layer and the cover layer are welded in sequence from the bottom of the small end of the double V-shaped composite groove;
the welding current that welding priming layer adopted is 90 ~ 130A, the welding current that welding filling layer adopted is 180 ~ 200A, the welding current that welding capping layer adopted is 180 ~ 200A.
7. The method of welding can panels of an earth-covering can of claim 6, wherein the inter-track temperature of the weld is 150 ℃ or less.
8. The method of welding can walls of an earth-covering can as defined in claim 6, wherein the welding primer layer is formed by a single-side welding and double-side forming technique.
9. The method for welding can walls of a soil covering can according to claim 6, wherein the welding primer layer adopts the following process parameters: the welding current is 90-130A, the voltage is 18-20V, the diameter of a welding wire is 1.2mm, the welding speed is 16-22 cm/min, the wire feeding speed is 80-110 in/min, the elongation of the welding wire is 8-12 mm, and the gas flow is 20-30L/min;
the welding filling layer adopts the following technological parameters: the welding current is 180-200A, the voltage is 23-26V, the diameter of a welding wire is 1.2mm, the welding speed is 18-22 cm/min, the wire feeding speed is 90-110 in/min, the elongation of the welding wire is 8-12 mm, and the gas flow is 20-30L/min;
the welding cover surface layer adopts the following technological parameters: the welding current is 180-200A, the voltage is 23-26V, the diameter of a welding wire is 1.2mm, the welding speed is 14-20 cm/min, the wire feeding speed is 80-100 in/min, the elongation of the welding wire is 8-12 mm, and the gas flow is 20-30L/min.
10. A method of welding can walls of casing pots according to any of claims 1 to 5 where in step (2) the shielding gas used in the MIG welding is a mixture of 75 vol% to 85 vol% carbon dioxide and 15 vol% to 25 vol% argon.
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| CN115121915A (en) * | 2022-07-29 | 2022-09-30 | 武汉一冶钢结构有限责任公司 | CO (carbon monoxide) 2 Gas shielded welding one-point breakdown method |
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