CN116117276A - Composite welding method of stainless steel composite steel ultra-wide gap butt joint for bridge - Google Patents
Composite welding method of stainless steel composite steel ultra-wide gap butt joint for bridge Download PDFInfo
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- CN116117276A CN116117276A CN202310257081.2A CN202310257081A CN116117276A CN 116117276 A CN116117276 A CN 116117276A CN 202310257081 A CN202310257081 A CN 202310257081A CN 116117276 A CN116117276 A CN 116117276A
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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
- B23K9/32—Accessories
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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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
- B23K2103/05—Stainless steel
Abstract
The invention relates to a welding method of composite welding of a stainless steel composite steel ultra-wide gap butt joint for a bridge, which comprises the steps of firstly adopting carbon dioxide gas shielded welding to carry out base layer welding, adopting a stainless steel flux-cored wire to carry out gas shielded transition layer welding, finally adopting a stainless steel flux-cored wire to carry out stainless steel cladding welding in a gas shielded mode, and adopting heat preservation cotton to cover to carry out heat preservation and slow cooling to normal temperature after the welding is finished. The invention has reasonable conception, good welding quality, excellent joint mechanical property and higher welding efficiency, can effectively solve the welding problem of the ultra-wide gap butt joint of the stainless steel composite steel for the bridge, and has simple and easy operation and strong practicability.
Description
Technical Field
The invention relates to the field of manufacturing of steel bridges, in particular to a composite welding method of a stainless steel composite steel ultra-wide gap butt joint for a bridge.
Background
The steel bridge deck structure is used as a main stress member of a railway steel bridge and directly bears railway load, and has good corrosion resistance and mechanical property. For a railway steel bridge with the design service life of 100 years, the existing anti-corrosion method cannot achieve synchronization of primary corrosion prevention and the design life of the steel bridge, and maintenance, repair and recoating of deck corrosion prevention are required to be carried out for quite a long time, traffic is required to be interrupted, and huge economic loss is caused.
In recent years, the gradually developed stainless steel composite steel plate for the bridge has good corrosion resistance of stainless steel cladding stainless steel and high strength and high toughness of base bridge steel, can be used for replacing a single bridge steel plate, can remarkably improve the corrosion resistance and service life of a bridge deck structure, and achieves the durability target which cannot be achieved by the existing corrosion prevention technology. However, there is a great difference in welding performance between the bridge steel base layer and the stainless steel cladding layer of the stainless steel clad steel plate for the bridge, and the following problems need to be solved in the welding process: when the base layer is welded firstly and then the stainless steel cladding is welded, the dilution problem of the alloy elements of the cladding weld joint by the base layer weld joint should be considered; when the stainless steel composite layer is welded firstly and then the base layer is welded, the problem that the alloy elements of the stainless steel composite layer are molten into the base layer welding seam so as to reduce the low-temperature impact performance of the base layer welding seam is considered. Moreover, the stainless steel composite steel plate for the bridge is possibly subjected to larger assembly gaps when the bridge deck is in butt joint at the bridge position due to the influences of factors such as machining precision, site temperature, steel beam assembly line type and the like, and the butt joint welding quality of the composite steel plate is possibly influenced.
Disclosure of Invention
Aiming at the technical problems in the background technology, the invention provides a welding method for composite welding of a stainless steel composite steel ultra-wide gap butt joint for a bridge, which has the advantages of reasonable conception, good welding quality, excellent mechanical property of the joint and higher welding efficiency, and can effectively solve the welding problem of the stainless steel composite steel ultra-wide gap butt joint for the bridge, and the method is simple and easy to operate and has strong practicability.
The technical scheme of the invention is as follows:
according to the welding method for the composite welding of the ultra-wide gap butt joint of the stainless steel composite steel for the bridge, carbon dioxide gas shielded welding is adopted to perform base layer welding, then stainless steel flux-cored wire gas shielded welding is adopted to perform transition layer welding, finally stainless steel cladding welding is performed by adopting the stainless steel flux-cored wire gas shielded welding, and heat preservation and slow cooling are performed to normal temperature by adopting heat preservation cotton coverage after welding is completed.
The welding method for the composite welding of the stainless steel composite steel ultra-wide gap butt joint for the bridge comprises the following steps:
1) Groove machining
Groove cutting is carried out on the side of the stainless steel cladding layer;
2) Welding material selection
Selecting a solid welding wire with mechanical properties equivalent to those of the base bridge steel and chemical components matched with the mechanical properties as a base welding material, selecting a welding material with alloy components 25% higher than those of the base welding material as a transition layer welding material, and selecting a welding material of a stainless steel composite layer welding material to ensure that main alloy elements of weld metal are not lower than the lower limit value specified by the stainless steel composite layer base metal standard;
3) Groove cleaning
Polishing and cleaning two sides of a weld groove before welding and exposing metallic luster;
4) Welding assembly
Positioning and assembling the horse board on the base layer, controlling the root gap to be 25-30 mm, and arranging ceramic gaskets on the back surface of the gap according to the assembling gap;
5) Welding of base layers
Using solid wire CO 2 Welding the base layer by gas shielded welding;
6) Transition layer welding
Using flux-cored wire CO 2 Welding a transition layer under the protection of gas;
7) Stainless steel multi-layer welding
Using flux-cored wire CO 2 Welding the stainless steel cladding layer under the gas protection;
8) Post-weld heat preservation
And (5) adopting heat preservation cotton to cover for heat preservation and slow cooling to normal temperature.
The welding method for the composite welding of the stainless steel composite steel ultra-wide gap butt joint for the bridge comprises the following steps: and step 1) is to process a groove on the stainless steel cladding side by adopting a plasma cutting process.
The welding method for the composite welding of the stainless steel composite steel ultra-wide gap butt joint for the bridge comprises the following steps: the joint bevel in the step 1) is in a V-shaped bevel, the bevel angle is 45 degrees, and the bevel angle is reduced along with the increase of the root gap.
The welding method for the composite welding of the stainless steel composite steel ultra-wide gap butt joint for the bridge comprises the following steps: and 3) polishing and cleaning the two sides of the weld groove within 30mm before welding.
The welding method for the composite welding of the stainless steel composite steel ultra-wide gap butt joint for the bridge comprises the following steps: the temperature between welding layers is 120-150 ℃ and CO is generated when the base layer is welded in the step 5) 2 The air flow is 15-20L/min, the welding current is 200-260A, the welding voltage is 22-28V, the welding speed is 200-300 mm/min, the direct current of the power supply is reversely connected, and the dry extension is 18mm.
The welding method of the composite welding of the stainless steel composite steel ultra-wide gap butt joint for the bridge comprises the following steps of 6) adopting a small-current multi-pass welding method to reduce the welding bead (06) of a base layer welding line metal in a molten mode, and welding CO 2 The air flow is 15-20L/min, the welding current is 210-230A, the welding voltage is 28-32V, the welding speed is 260-300 mm/min, the power supply is in direct current reverse connection, and the dry extension is 18mm.
The welding method for the composite welding of the stainless steel composite steel ultra-wide gap butt joint for the bridge comprises the following steps: the welding thickness of the transition layer in the step 6) is 2-3 mm, wherein the base layer is about 2mm, the stainless steel cladding layer is about 1mm, the interlayer temperature during welding is 70-100 ℃, and the inter-channel temperature during welding of the transition layer and the stainless steel cladding layer is controlled below 60 ℃.
The welding method for the composite welding of the stainless steel composite steel ultra-wide gap butt joint for the bridge comprises the following steps: the step 7) of stainless steel multi-layer welding adopts low current, direct current reverse connection and multi-pass welding, and a welding nozzle is not suitable for transverse swing during welding.
The welding method for the composite welding of the stainless steel composite steel ultra-wide gap butt joint for the bridge comprises the following steps: the temperature between welding layers is 70-100 ℃ in the step 7) of welding the stainless steel cladding; CO 2 The air flow is 15-20L/min, the welding current is 210-230A, the welding voltage is 28-32V, the welding speed is 260-300 mm/min, the direct current of the power supply is reversely connected, and the dry extension is 18mm.
The beneficial effects are that:
the welding method of the stainless steel composite steel ultra-wide gap butt joint for the bridge is reasonable in conception, is used for welding the stainless steel composite steel ultra-wide gap butt joint for the bridge, has the advantages of good welding quality, excellent joint mechanical property and higher welding efficiency, can effectively solve the welding problem of the stainless steel composite steel ultra-wide gap butt joint for the bridge, is simple and easy to operate and high in practicability, provides a better solution for welding the stainless steel composite steel ultra-wide gap butt joint for the bridge, and is worthy of wide popularization.
According to the invention, the transition layer is arranged, different welding materials are selected, and the base layer, the transition layer and the stainless steel composite steel plate for the bridge are welded in sequence, so that the formed joint has excellent mechanical properties, and meets the design and standard requirements. The invention has good weld fusion, no welding defects such as cracks, air holes, inclusions, slag inclusion and the like, good weld appearance forming and even and smooth weld transition.
Drawings
FIG. 1 is a schematic view of a joint groove form (taking a plate thickness delta 3mm plus delta 16mm as an example) in a welding method of ultra-wide gap butt joint composite welding for a bridge of the invention;
FIG. 2 is a schematic view of the welding bead deposition of a base layer in the welding method of the ultra-wide gap butt joint composite welding of the stainless steel composite steel for the bridge (taking the plate thickness delta 3 mm+delta 16mm as an example);
FIG. 3 is a schematic diagram of an inspection template for a transition layer before welding in a welding method of the ultra-wide gap butt joint composite welding of the stainless steel composite steel for the bridge;
FIG. 4 is a schematic diagram of welding pass deposition of a transition layer welding bead (taking a plate thickness delta 3 mm+delta 16mm as an example) in a welding method of the ultra-wide gap butt joint composite welding of the stainless steel composite steel for the bridge;
FIG. 5 is a schematic view of a sample plate for inspecting a transition layer after the transition layer is welded in the welding method of the ultra-wide gap butt joint composite welding of the stainless steel composite steel for the bridge;
fig. 6 is a schematic view of welding pass deposition of stainless steel clad steel (for example, the thickness of δ3mm+δ16mm) in the welding method of the ultra-wide gap butt joint composite welding for the bridge according to the present invention.
Annotation: 01-stainless steel cladding, 02-base layer, 03-ceramic liner, 04-base layer weld joint, 05-base layer inspection template, 06-transition layer weld joint, 07-transition layer inspection template and 8-cladding weld joint; in FIG. 2 (1) to the upper part
The weld bead sequence number of the base layer; in FIG. 4 +.>
The number of the welding bead of the transition layer is; in FIG. 6 +.>
Is a multi-layer weld bead serial number.
Detailed Description
The invention relates to a welding method for composite welding of a stainless steel composite steel ultra-wide gap butt joint for a bridge, which mainly comprises the steps of firstly adopting carbon dioxide gas shielded welding to carry out base layer 02 welding, adopting a stainless steel flux-cored wire gas shielded welding to carry out transition layer welding, adopting a stainless steel flux-cored wire gas shielded welding to carry out stainless steel cladding 01 welding, and adopting heat preservation cotton to cover to carry out heat preservation and slow cooling to normal temperature after the welding is finished.
The invention discloses a welding method for composite welding of a stainless steel composite steel ultra-wide gap butt joint for a bridge, which specifically comprises the following steps:
1) Groove machining
The groove is formed on the side of the stainless steel cladding 01 of the stainless steel composite steel ultra-wide gap butt joint (see figure 1), so that the defect that stainless steel cladding materials can be melted off when a base layer is welded can be avoided, and the welding quality is structurally ensured. And processing a groove on the stainless steel cladding 01 side of the stainless steel composite steel ultra-wide gap butt joint by adopting a plasma cutting process. The milling process is not easy to process the groove, because the milling process is easy to pollute the stainless steel composite layer 01 to the bridge steel base layer 02, and stainless steel components are easy to melt into the bridge steel base layer 02 in the welding process, so that the impact toughness of the base layer weld joint 04 can be reduced. The bevel of the welding joint is in a V-shaped bevel, the bevel angle is 45 degrees, and the bevel angle is reduced along with the increase of the root gap.
2) Welding material selection
Base layer welding material: and selecting a solid welding wire with mechanical properties equivalent to those of the base bridge steel and matched chemical components. Such as: the solid welding wire ER55-G has a diameter of 1.2mm and comprises the following components, by mass, 0.08% of C, 0.62% of Si, 1.54% of Mn, 0.004% of S, 0.012% of P, 0.65% of Ni, 0.021% of Ti and the balance of Fe.
Transition layer welding material: the welding material with the alloy component 25% higher than the base layer welding material is selected. Such as: flux-cored wire E309T1-1, diameter 1.2mm; the flux-cored wire filled with the powder comprises, by mass, 0.023% of C, 0.41% of Si, 1.19% of Mn, 0.006% of S, 0.013% of P, 0.021% of Cu, 22.32% of Cr, 0.027% of Mo, 12.96% of Ni and the balance of Fe.
Stainless steel clad welding material: the welding material selected for welding the stainless steel cladding 01 needs to ensure that the main alloy element of the metal of the cladding welding line 08 is not lower than the lower limit value specified by the standard of the stainless steel cladding base material. Such as: flux-cored wire E347T1-1 with a diameter of 1.2mm; the flux-cored wire filled with the powder comprises, by mass, 0.031% of C, 0.32% of Si, 1.66% of Mn, 0.002% of S, 0.008% of P, 0.008% of Cu, 19.49% of Cr, 0.002% of Mo, 9.44% of Ni and the balance of Fe.
3) Groove cleaning
Before welding, rust, greasy dirt and the like within the range of 30mm on two sides of a weld groove are required to be polished and cleaned, metallic luster is exposed, and the stainless steel composite layer 01 can be cleaned by acetone and the like.
4) Welding assembly
The horse plates (the horse plates are used for steel bridges and are usually 16-20 by 150 by 400, and are transversely positioned on the side of a base material to control welding deformation) are adopted to be positioned and assembled on the base layer 02, the horse plates are not allowed to be positioned on the stainless steel composite layer 01, the root gap is controlled to be 25-30 mm, and ceramic gaskets 03 are arranged on the back surfaces of the gaps according to the assembling gap (see figure 1).
5) Welding of the base layer 02
Using solid wire CO 2 Welding the base layer 02 by gas shielded welding; the temperature between welding layers is 120-150 ℃; CO 2 The air flow is 15-20L/min, the welding current is 200-260A, the welding voltage is 22-28V, the welding speed is 200-300 mm/min, the direct current of the power supply is reversely connected, and the dry extension is 18mm.
6) Transition layer welding
Using flux-cored wire CO 2 And welding the transition layer by gas shielding. In order to ensure the corrosion resistance of the composite steel plate, the welding quality of the transition layer is critical, and the transition layer welding adopts a small-current multi-pass welding method so as to reduce the melting of the metal of the base layer welding seam 04 into the transition layer welding bead 06.CO 2 The air flow is 15-20L/min, the welding current is 210-230A, the welding voltage is 28-32V, the welding speed is 260-300 mm/min, the direct current of the power supply is reversely connected, and the dry extension is 18mm.
The thickness of the transition layer is strictly controlled by using the inspection template 07 for the transition layer, and the welding thickness of the transition layer must be ensured to be 2-3 mm, wherein the base layer 02 occupies about 2mm, and the stainless steel clad layer 01 occupies about 1mm. The interlayer temperature is 70-100 ℃ during welding, and the temperature between the transition layer and the stainless steel cladding 01 is controlled below 60 ℃.
7) Stainless steel cladding 01 welding
Using flux-cored wire CO 2 Welding the stainless steel cladding 01 under the gas protection; the welding nozzle is not suitable for transverse swing during welding by adopting small current and direct current reverse connection and multi-pass welding. The temperature between welding layers is 70-100 ℃; CO 2 The air flow is 15-20L/min, the welding current is 210-230A, the welding voltage is 28-32V, the welding speed is 260-300 mm/min, the direct current of the power supply is reversely connected, and the dry extension is 18mm.
8) Post-weld heat preservation
And (5) adopting heat preservation cotton to cover for heat preservation and slow cooling to normal temperature.
Wherein, the stainless steel composite layer 01 material is 3mm thick 316L stainless steel, the base layer 02 material is 16mm thick Q420qE steel plate, the chemical compositions of the composite steel plate stainless steel composite layer 01 and the base layer 02 are shown in Table 1, and the mechanical properties of the composite steel plate are shown in Table 2.
Table 1:316L+Q420qE composite steel plate chemical composition
Table 2:316L+Q420qE composite steel plate mechanical property
Example 1
In the embodiment 1 of the invention, the super-wide gap flat butt joint of the 316L+Q420qE composite steel plates is selected; aiming at 316L+Q420qE composite steel plates (stainless steel cladding 01 is 3mm thick 316L stainless steel, base layer 02 is 16mm thick Q420qE steel plates), ultra-wide gap butt joint welding is carried out, and the method specifically comprises the following steps:
10 The groove is processed by adopting a plasma cutting process, the groove is in a V-shaped groove form, the angle of the groove formed by the two steel plates is 45 degrees, and the diagram of the groove is shown in figure 1.
20 Polishing and cleaning rust, greasy dirt and the like within the range of 30mm on two sides of the weld groove, exposing metallic luster, and cleaning the greasy dirt and other impurities on the stainless steel composite layer 01 by adopting acetone.
30 Positioning and assembling the ceramic lining on the base layer 02 by adopting a horse plate, controlling the root gap to be 25-30 mm, and arranging a ceramic lining 03 on the back of the gap according to the assembling gap.
40 Using solid wire CO 2 Welding the base layer 02 by gas shielded welding; the temperature between welding layers is 120-150 ℃; CO 2 The air flow is 15-20L/min, the welding current is 200-260A, the welding voltage is 22-28V, the welding speed is 200-300 mm/min, the direct current of the power supply is reversely connected, and the dry extension is 18mm. The welding bead cladding schematic diagram is shown in fig. 2.
50 Using flux-cored wire CO 2 Welding a transition layer under the protection of gas; the temperature between welding layers is 70-100 ℃; CO 2 The air flow is 15-20L/min, the welding current is 210-230A, the welding voltage is 28-32V, the welding speed is 260-300 mm/min, the direct current of the power supply is reversely connected, and the dry extension is 18mm. The thickness of the transition layer is strictly controlled by using the inspection template 07 for the transition layer, and the welding thickness of the transition layer must be ensured to be 2-3 mm, wherein the base layer 02 occupies about 2mm, and the stainless steel clad layer 01 occupies about 1mm. Schematic diagrams of the inspection template 07 for the transition layer are shown in fig. 3 and 5. The welding bead cladding schematic diagram is shown in fig. 4.
60 Using flux-cored wire CO 2 Welding the stainless steel cladding 01 under the gas protection; the temperature between welding layers is 70-100 ℃; CO 2 The air flow is 15-20L/min, the welding current is 210-230A, the welding voltage is 28-32V, the welding speed is 260-300 mm/min, the direct current of the power supply is reversely connected, and the dry extension is 18mm. The welding bead cladding schematic diagram is shown in fig. 6.
(70) And (5) adopting heat preservation cotton to cover for heat preservation and slow cooling to normal temperature. The mechanical properties of the welded joint are shown in Table 3 below.
Table 3: example 1 mechanical Properties of the welded Joint
The invention has reasonable conception, good welding quality, excellent joint mechanical property and higher welding efficiency, can effectively solve the welding problem of the ultra-wide gap butt joint of the stainless steel composite steel for the bridge, and has simple and easy operation and strong practicability.
The invention is not limited to the above embodiments, and based on the technical solution disclosed in the invention, a person skilled in the art may make some substitutions and modifications to some technical features thereof without creative effort according to the technical content disclosed, and all the substitutions and modifications are within the protection scope of the invention.
Claims (10)
1. A welding method for composite welding of a stainless steel composite steel ultra-wide gap butt joint for a bridge is characterized by comprising the following steps: firstly, welding a base layer (02) by adopting carbon dioxide gas shielded welding, then welding a transition layer by adopting a stainless steel flux-cored wire gas shield, finally welding a stainless steel cladding (01) by adopting a stainless steel flux-cored wire gas shield, and after welding, performing heat preservation and slow cooling to normal temperature by adopting heat preservation cotton cover.
2. The welding method for composite welding of the stainless steel composite steel ultra-wide gap butt joint for the bridge, as claimed in claim 1, is characterized by comprising the following steps:
1) Groove machining
A groove is formed on the side of the stainless steel composite layer (01);
2) Welding material selection
Selecting a solid welding wire with mechanical properties equivalent to those of the base bridge steel and chemical components matched with the mechanical properties as a base welding material, selecting a welding material with alloy components 25% higher than those of the base welding material as a transition layer welding material, and selecting a welding material of a stainless steel composite layer welding material to ensure that main alloy elements of weld metal are not lower than the lower limit value specified by the stainless steel composite layer base metal standard;
3) Groove cleaning
Polishing and cleaning two sides of a weld groove before welding and exposing metallic luster;
4) Welding assembly
Positioning and assembling the ceramic lining on a base layer (02) by adopting a horse plate, controlling the root gap to be 25-30 mm, and arranging a ceramic lining (03) on the back of the gap according to the assembling gap;
5) Welding of the base layer (02)
Using solid wire CO 2 Welding the base layer (02) by gas shielded welding;
6) Transition layer welding
Using flux-cored wire CO 2 Welding a transition layer under the protection of gas;
7) Welding of stainless steel cladding (01)
Using flux-cored wire CO 2 Welding the stainless steel cladding layer under the gas protection;
8) Post-weld heat preservation
And (5) adopting heat preservation cotton to cover for heat preservation and slow cooling to normal temperature.
3. The welding method of the ultra-wide gap butt joint composite welding of the stainless steel composite steel for the bridge, which is characterized in that: and step 1) is to process a groove on the side of the stainless steel composite layer (01) by adopting a plasma cutting process.
4. The welding method of the ultra-wide gap butt joint composite welding of the stainless steel composite steel for the bridge, which is characterized in that: the groove in the step 1) is in a V-shaped groove, the groove angle is 45 degrees, and the groove angle is reduced along with the increase of the root gap.
5. The welding method of the ultra-wide gap butt joint composite welding of the stainless steel composite steel for the bridge, which is characterized in that: and 3) polishing and cleaning the two sides of the weld groove within 30mm before welding.
6. The welding method of the ultra-wide gap butt joint composite welding of the stainless steel composite steel for the bridge, which is characterized in that: the step 5) is that the temperature between welding layers is 120 ℃ to 150 ℃ and CO is generated when the base layer (02) is welded 2 The air flow is 15-20L/min, the welding current is 200-260A, the welding voltage is 22-28V, the welding speed is 200-300 mm/min, the direct current of the power supply is reversely connected, and the dry extension is 18mm.
7. The welding method of the ultra-wide gap butt joint composite welding for the bridge stainless steel composite steel according to claim 1, wherein the transition layer welding in the step 6) adopts a low-current multi-pass welding method to reduce the melting of the metal of the base layer welding seam (04) into the transition layer welding bead (06), and CO is generated during welding 2 The air flow is 15-20L/min, the welding current is 210-230A, the welding voltage is 28-32V, the welding speed is 260-300 mm/min, the power supply is in direct current reverse connection, and the dry extension is 18mm.
8. The welding method of the ultra-wide gap butt joint composite welding of the stainless steel composite steel for the bridge, as set forth in claim 1 or 7, characterized in that: the welding thickness of the transition layer in the step 6) is 2-3 mm, wherein the base layer (02) is about 2mm, the stainless steel cladding layer (01) is about 1mm, the interlayer temperature during welding is 70-100 ℃, and the inter-channel temperature during welding of the transition layer and the stainless steel cladding layer (01) is controlled below 60 ℃.
9. The welding method of the ultra-wide gap butt joint composite welding of the stainless steel composite steel for the bridge, which is characterized in that: the step 7) of welding the stainless steel composite layer (01) adopts low current and direct current reverse connection and multi-pass welding, and a welding nozzle is not suitable for transverse swing during welding.
10. The welding method of the ultra-wide gap butt joint composite welding of the stainless steel composite steel for the bridge according to claim 1 or 9, wherein the welding method comprises the following steps: the temperature between welding layers is 70-100 ℃ when the stainless steel composite layer (01) is welded in the step 7); CO 2 The air flow is 15-20L/min, the welding current is 210-230A, the welding voltage is 28-32V, the welding speed is 260-300 mm/min, the direct current of the power supply is reversely connected, and the dry extension is 18mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116786951A (en) * | 2023-07-12 | 2023-09-22 | 中国五冶集团有限公司 | Butt welding method for steel structure with wide gap |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116786951A (en) * | 2023-07-12 | 2023-09-22 | 中国五冶集团有限公司 | Butt welding method for steel structure with wide gap |
| CN116786951B (en) * | 2023-07-12 | 2024-03-19 | 中国五冶集团有限公司 | Butt welding method for steel structure with wide gap |
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