CN110773891A - Welding method of stainless steel composite plate - Google Patents
Welding method of stainless steel composite plate Download PDFInfo
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- CN110773891A CN110773891A CN201911070585.3A CN201911070585A CN110773891A CN 110773891 A CN110773891 A CN 110773891A CN 201911070585 A CN201911070585 A CN 201911070585A CN 110773891 A CN110773891 A CN 110773891A
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- shaped groove
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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
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
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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
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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
- B23K2103/16—Composite materials, e.g. fibre reinforced
Abstract
The invention discloses a welding method of a stainless steel composite plate, which comprises the following steps: step 1: the base layer is a carbon steel layer, the composite layer is a corrosion-resistant alloy layer, double V-shaped grooves are formed, and the composite plates are butted; step 2: welding a groove between the V-shaped groove on one side of the corrosion-resistant alloy layer and the V-shaped groove on one side of the carbon steel layer by adopting plasma welding or laser welding to form an inner welding seam of the base layer; and step 3: welding the bottom of the V-shaped groove on one side of the corrosion-resistant alloy layer by adopting a laser cladding technology to form a transition layer welding seam; and 4, step 4: adopting MAG, TIG or laser cladding to weld the outside of the transition layer weld joint to form a multilayer weld joint; and 5: and (4) welding the V-shaped groove on one side of the carbon steel layer by adopting submerged-arc welding to form an outer welding seam of the base layer. The carbon steel layer adopts submerged arc welding and laser welding (or plasma welding), the width of a welding seam in the base layer is reduced while the penetration of the base layer is ensured, so that the width of the bottom of the clad layer is reduced, the cladding amount of the clad layer is reduced, the welding efficiency is improved, and welding wires are saved.
Description
The technical field is as follows:
the invention relates to the technical field of layered structure bimetal welding, in particular to a welding method of a stainless steel composite plate.
Background art:
along with the increasing energy demand, the exploitation strength of petroleum and natural gas in harsh corrosive environment is gradually increased, the problem of pipeline corrosion becomes more prominent, and the traditional single corrosion prevention technology such as adding a corrosion inhibitor, adopting a plastic inner coating, using a non-metal pipe and the like is difficult to meet the requirements on corrosion resistance reliability and economic indexes. To solve the problem of high content of H
2S/CO
2The exploitation and oil of the strong corrosive oil and gas fieldThe corrosion problem faced by gas delivery, corrosion resistant alloy pipes such as stainless steel, titanium alloy and the like are widely applied in corrosive environments such as petroleum, chemical engineering, oceans and the like due to the pipes with excellent corrosion resistance and processing technological properties. However, the cost of the pure stainless steel or titanium alloy pipeline is high, and the problem is particularly obvious when the pipeline is used as a structural component.
The stainless steel inner composite pipe fully utilizes the characteristics of low carbon steel price, good comprehensive mechanical property and excellent corrosion resistance of the stainless steel, not only meets the service environment of severe corrosion working conditions, but also saves a large amount of precious metals, thereby reducing the cost, saving materials and showing wide application prospects in the industrial fields of petrochemical industry, flue gas desulfurization, chemical industry, environmental protection and the like.
The invention discloses a Chinese patent with publication number CN 106624403A in 2017, 5, month and 10, and the patent name is a bimetal composite plate welding method. Although the welding method solves the problem of low production efficiency caused by large fusion coating amount of the coating welding seam, the problems of poor corrosion resistance and unstable low-temperature impact performance of narrow-gap welding such as laser welding and the like exist, and the welding method adopts single-side welding and double-side forming, has limited fusion depth and is difficult to realize the welding of thick-wall composite plates.
The Chinese patent with publication number CN 108705200A, published in 26.10.2018, has the patent name of a welding method of a stainless steel lining composite plate, adopts a double V-shaped groove, solves the problem of corrosion resistance of a welding seam of a base layer by a method of laser, submerged arc welding and TIG, but adopts TIG as a transition layer, most energy of electric arc is used for melting the base layer, so that Fe element diffusion cannot be effectively isolated, the thickness of the transition layer can only be increased to ensure the alloy content of the stainless steel layer for the technical requirement of stricter dilution, and the V-shaped groove is filled with welding wires, so that the corners of the V-shaped groove are easy to have defects; in addition, the welding method welds the base layer first and then welds the clad layer, and TIG welding many times of thermal cycles may cause the mechanical properties of the welding seam of the base layer to deteriorate, thereby influencing the low-temperature impact stability.
The invention content is as follows:
the invention aims to provide a welding method of a stainless steel composite plate, which can reduce the cladding amount of a composite layer, improve the welding efficiency, has excellent welding seam performance and low welding cost and is easy to realize automatic production.
The purpose of the invention is solved by the following technical scheme: a welding method of a stainless steel composite plate comprises the following steps:
step 1: the stainless steel composite plate comprises a base layer and a composite layer, wherein the base layer is a carbon steel layer, the composite layer is a corrosion-resistant alloy layer, double V-shaped grooves are formed, and the composite plate is butted; the thickness of the carbon steel layer is 6-30mm, the thickness of the corrosion-resistant alloy layer is 0.5-10mm, the height of a V-shaped groove at one side of the carbon steel layer is 3-20mm smaller than that of the carbon steel layer, the groove angle is 50-100 degrees, the height of the V-shaped groove at one side of the corrosion-resistant alloy layer is 0-5mm larger than that of the corrosion-resistant alloy layer, the width of the bottom of the carbon steel layer is 0-10mm, and the groove angle is 40-90 degrees;
step 2: welding a groove between the V-shaped groove on one side of the corrosion-resistant alloy layer and the V-shaped groove on one side of the carbon steel layer by adopting plasma welding or laser welding to form an inner welding seam of the base layer;
and step 3: welding the bottom of the V-shaped groove on one side of the corrosion-resistant alloy layer by adopting a laser cladding technology to form a transition layer welding seam;
and 4, step 4: adopting MAG, TIG or laser cladding to weld the outside of the transition layer weld joint to form a multilayer weld joint;
and 5: and (4) welding the V-shaped groove on one side of the carbon steel layer by adopting submerged-arc welding to form an outer welding seam of the base layer.
The invention has the beneficial effects that:
1. the carbon steel layer of the base layer adopts submerged arc welding and laser welding (or plasma welding), and the maximum welding thickness reaches 30 mm; the submerged arc welding is mature in application in the field of welding of important pipeline steel such as oil and gas transmission and the like, and has the characteristics of stable technological performance, excellent comprehensive mechanical property, good corrosion resistance and the like; the laser welding (or plasma welding) is narrow gap welding, and the width of a welding seam in the base layer is reduced while the penetration of the base layer is ensured, so that the width of the bottom of the clad layer is reduced, and the aims of reducing the cladding amount of the clad layer, improving the welding efficiency and saving welding wires are fulfilled; the transition layer plays a role in isolating carbon steel and stainless steel layers, the groove appearance is complex, defects are easy to generate in the traditional welding process, the diffusion of the Fe element of the base layer to the transition layer can be effectively controlled by adopting the laser cladding welding process, so that the cladding thickness of the transition layer is reduced, the current domestic laser manufacturing technology is mature, the price is low, and the industrial application is easy to realize; in the welding sequence, the multiple layers are welded firstly, and then the base layer is welded, so that the influence of the welding heat input of the multiple layers on the welding seam structure of the base layer can be avoided, and the excellent comprehensive mechanical property of the welding seam of the base layer is ensured.
2. The invention realizes the high-quality and high-efficiency welding of the stainless steel composite plate through reasonable groove design and welding process matching, has excellent performance, the diffusion distance of the Fe element of the multi-layer transition layer is less than or equal to 1mm, the impact energy of the welding line at minus 45 ℃ is more than 100J, the welding cost is low, the automatic production is easy to realize, and the invention has wide market prospect.
Description of the drawings:
FIG. 1 is a schematic diagram of groove welding of a stainless steel lining composite plate according to the present invention.
Description of reference numerals: 1-carbon steel layer, 2-corrosion resistant alloy layer, 3-base layer inner welding seam, 4-transition layer welding seam, 5-multiple layer welding seam and 6-base layer outer welding seam.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to specific examples.
In this example, 825/X65 hot-rolled bimetal composite plates of (22+3) mm were welded, and the welded test plate size was 180X 500 mm.
(1) A double V-shaped groove is formed on the welding test plate, and the specific size is shown in figure 1: the thickness of the carbon steel layer 1 is 22mm, the thickness of the corrosion-resistant alloy layer 2 is 3mm, the height of a V-shaped groove on one side of the carbon steel layer 1 is smaller than the thickness of the carbon steel layer 1 by 12mm, the groove angle is 60 degrees, the height of the V-shaped groove on one side of the corrosion-resistant alloy layer 2 is larger than the thickness of the corrosion-resistant alloy layer by 0.5mm, the width of the bottom of the carbon steel layer is 2mm, and the groove angle is.
(2) And welding the groove between the V-shaped groove on one side of the corrosion-resistant alloy layer and the V-shaped groove on one side of the carbon steel layer from one side of the corrosion-resistant alloy layer by laser welding to form the welding seam 3 in the base layer without wire filling. Specific welding parameters are shown in table 1.
TABLE 1 welding parameters for in-base layer welding
| Defocus (mm) | Power (kw) | Welding speed (m/min) | Spot diameter (mm) |
| -2 | 4 | 4.5 | 0.2 |
(3) Welding the bottom of the V-shaped groove on one side of the corrosion-resistant alloy layer by adopting a laser cladding technology to form a transition layer welding seam 4, wherein the welding material for welding the transition layer is 625 metal powder, the protective gas is pure Ar, and the welding process is shown in Table 2. The purpose of welding the transition layer welding seam 4 is to isolate the base layer and the clad layer and prevent Fe atoms of the base layer from directly diffusing to the clad layer welding seam, so that the aims of ensuring the content of alloy elements of the clad layer and the corrosion resistance of the welding seam are fulfilled, and the welding thickness can be about 0.5mm because the Fe elements can be effectively isolated by the laser cladding welding process. Because the laser deposited welding seam has good surface quality, the laser deposited welding seam does not need to be polished and can be cleaned by a steel wire brush.
TABLE 2 transition layer weld parameters
| Defocus (mm) | Power (kw) | Scanning Rate (mm/s) | Spot diameter (mm) |
| 12 | 0.5 | 8 | 1.1 |
(4) And performing welding on the transition layer welding seam 4 by adopting TIG (tungsten inert gas) to form a multilayer welding seam 5. And the multilayer welding seam 5 adopts multilayer welding until the composite groove is filled, and the height of the multilayer welding seam is not lower than that of the multilayer. Welding materials selected for the multilayer welding seam are 625 (phi 1.2mm) welding wires, the protective gas is pure Ar, and the welding process is shown in Table 3. And a steel wire brush is required to clean the upper layer of welding seam before each welding.
(5) And (3) welding the V-shaped groove from one side of the carbon steel layer by adopting submerged arc welding to form a base layer outer welding seam 6, wherein the welding wire is H08E in the specification of phi 4.0mm, and the welding parameters are shown in Table 4.
(6) The weld joint was subjected to conventional mechanical property and corrosion resistance tests, and the results are shown in table 5.
TABLE 3 multilayer welding parameters
| Welding current (A) | Arc voltage (V) | Welding speed (mm/min) | Wire feed speed (mm/min) |
| 150 | 12 | 50 | 1200 |
TABLE 4 welding parameters for out-of-base welding
TABLE 5 weld performance test results
Claims (6)
1. A welding method of a stainless steel composite plate is characterized by comprising the following steps: the method comprises the following steps:
step 1: the stainless steel composite plate comprises a base layer and a composite layer, wherein the base layer is a carbon steel layer, the composite layer is a corrosion-resistant alloy layer, double V-shaped grooves are formed, and the composite plate is butted; the thickness of the carbon steel layer is 6-30mm, the thickness of the corrosion-resistant alloy layer is 0.5-10mm, the height of a V-shaped groove at one side of the carbon steel layer is 3-20mm smaller than that of the carbon steel layer, the groove angle is 50-100 degrees, the height of the V-shaped groove at one side of the corrosion-resistant alloy layer is 0-5mm larger than that of the corrosion-resistant alloy layer, the width of the bottom of the carbon steel layer is 0-10mm, and the groove angle is 40-90 degrees;
step 2: welding a groove between the V-shaped groove on one side of the corrosion-resistant alloy layer and the V-shaped groove on one side of the carbon steel layer by adopting plasma welding or laser welding to form an inner welding seam of the base layer;
and step 3: welding the bottom of the V-shaped groove on one side of the corrosion-resistant alloy layer by adopting a laser cladding technology to form a transition layer welding seam;
and 4, step 4: adopting MAG, TIG or laser cladding to weld the outside of the transition layer weld joint to form a multilayer weld joint;
and 5: and (4) welding the V-shaped groove on one side of the carbon steel layer by adopting submerged-arc welding to form an outer welding seam of the base layer.
2. A method of welding stainless steel composite panels according to claim 1, wherein: the thickness of the carbon steel layer is 22mm, the thickness of the corrosion-resistant alloy layer is 3mm, the height of the V-shaped groove on one side of the carbon steel layer is smaller than the thickness of the carbon steel layer by 12mm, the groove angle is 60 degrees, the height of the V-shaped groove on one side of the corrosion-resistant alloy layer is larger than the thickness of the corrosion-resistant alloy layer by 0.5mm, the width of the bottom of the V-shaped groove is 2 mm.
3. A method of welding stainless steel composite panels according to claim 2, wherein: adopting laser welding to weld the groove between the V-shaped groove on one side of the corrosion-resistant alloy layer and the V-shaped groove on one side of the carbon steel layer to form an inner welding seam of the base layer, wherein the welding parameters are as follows: defocus amount: -2mm, power: 4kw, welding speed: 4.5m/min, spot diameter: 0.2 mm.
4. A method of welding stainless steel composite panels according to claim 2, wherein: the welding parameters for welding the bottom of the V-shaped groove on one side of the corrosion-resistant alloy layer by adopting a laser cladding technology are as follows: defocus amount: 12mm, power: 0.5kw, welding speed: 8m/min, spot diameter: 1.1 mm.
5. A method of welding stainless steel composite panels according to claim 2, wherein: welding parameters for welding on the transition layer welding seam 4 by adopting TIG are as follows: welding current 150A, arc voltage: 12V, welding speed: 50mm/min, wire feed speed: 1200 mm/min.
6. A method of welding stainless steel composite panels according to claim 2, wherein: welding parameters for welding the V-shaped groove on one side of the carbon steel layer by adopting submerged-arc welding are as follows: the current 1050A, the voltage 33 and the welding speed of the welding wire No. 1 wire are 1.4m/min, the current 900A, the voltage 36 and the welding speed of the welding wire No. 2 wire are 38m/min, and the current 700A, the voltage 38 and the welding speed of the welding wire No. 3 wire are 1.4 m/min.
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| CN111590223A (en) * | 2020-05-22 | 2020-08-28 | 中国石油天然气集团有限公司 | Welding method of titanium steel composite plate |
| CN112222653A (en) * | 2020-10-20 | 2021-01-15 | 中国石油天然气集团有限公司 | Welding method of layered bimetal composite plate |
| CN112475787A (en) * | 2020-10-22 | 2021-03-12 | 陕西铁路工程职业技术学院 | Preparation method of large-wall-thickness stainless steel/carbon steel laminated structure composite pipe |
| CN113145978A (en) * | 2021-04-16 | 2021-07-23 | 鞍钢股份有限公司 | Intermediate transition welding method for titanium steel composite plate |
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| CN113145978A (en) * | 2021-04-16 | 2021-07-23 | 鞍钢股份有限公司 | Intermediate transition welding method for titanium steel composite plate |
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