CN105562889A - Different-steel-grade welding process for stainless steel and weather-resistant steel and application of different-steel-grade welding process - Google Patents
Different-steel-grade welding process for stainless steel and weather-resistant steel and application of different-steel-grade welding process Download PDFInfo
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- CN105562889A CN105562889A CN201510992266.3A CN201510992266A CN105562889A CN 105562889 A CN105562889 A CN 105562889A CN 201510992266 A CN201510992266 A CN 201510992266A CN 105562889 A CN105562889 A CN 105562889A
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
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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
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Abstract
The invention discloses a different-steel-grade welding process for stainless steel and weather-resistant steel and an application of the different-steel-grade welding process, wherein the stainless steel is 022Cr17Ni12Mo2, the weather-resistant steel is 09CuPCrNi-A, and a flux-cored wire CO2 gas-shielded semi-automatic welding method is adopted. The different-steel-grade welding process comprises the following steps: 1) selecting a GFS-316L flux-cored wire as a welding material, wherein the diameter of the GFS-316L flux-cored wire is 1.2mm, and chemical components of the GFS-316L flux-cored wire meet standards AWS A5.22 E316LT1-1; 2) adopting a butt-joint welding joint form, and adopting a V-shaped groove joint seam form, wherein the groove angle is 60 degrees, and the root gap is 1-2mm; and 3) adopting multi-layer welding for a welding seam, wherein a temperature between layers does not exceed 150 DEG C. According to the different-steel-grade welding process, the mechanical property and the heat and corrosion resistance of the different-steel-grade welding joint are improved, the deposition efficiency is high, the welding process is simplified, and the labor intensity of a worker is relieved; the different-steel-grade welding process has the advantages of being simple in process, high in production efficiency and high in practicability, can be used for welding manufacturing of a SCR reactor of a marine diesel engine, and is of great significance to promoting the development of the SCR reactor.
Description
Technical field
The present invention relates to a kind of welded steel method, be specifically related to different steel grade welding procedure and the application thereof of a kind of stainless steel and weathering steel, belong to welding technology field.
Background technology
Diesel engine, as one of boats and ships major impetus system, has good economy performance, power bracket is wide, mobility good, high reliability, but meanwhile boat diesel engine exhaust is also day by day serious to the pollution of atmospheric environment.Generally adopt SCR (SCR:SCR:SelectiveCatalyticReduction) technology at present, carry out exhaust aftertreatment, to reduce the discharge value of NOx.In order to reduce the pollution of boat diesel engine operation to air, International Maritime Organization IMO requires to work the NOx emission standard implementing Tier III grade on January 1st, 2016.This means that increasing boats and ships need to install the diesel engine of SCR reactor tail gas after-treatment device, reduce the discharge value of NOx, could travel in the region of international regulations.
The environment that the material of SCR reactor and pipeline must adapt to is medium ammoniacal liquor, ammonia and meet sulphur in waste gas, the strong corrosive medium such as hydrogen sulfate ammonia/sulfate that steam produces when low temperature, environment temperature is 300-400 DEG C, pressure about 4bar.The case material of current most SCR reactor selects low-alloy structural steel Q345 (16MnR) to manufacture.But due to reactor temperature higher, manganese steel is at higher than the temperature of 425 DEG C during Long-Time Service, and in steel, carbide is met and produced graphitization tendency, and at high temperature the strength degradation of steel is more.In addition, owing to containing SO in flue gas
2medium, after dew-point temperature condensation, can produce corrosivity, and the corrosion resistance of 16MnR is poor to reactor shell.In addition, in order to prevent crackle, generally before the SCR container of welding Q345 steel work, needing workpiece to carry out entirety or local preheating, which results in the waste of resource and the deterioration of workman's working condition.Undoubtedly, stainless steel (as 316L) has good heat resistance and acid resistance, but if SCR reactor shell entirety adopts stainless steel to make, its cost can rise 7-8 doubly.Therefore, be necessary reasonably to select to be applicable to the manufactured materials of SCR reactor shell and corresponding welding technique thereof.
Find after deliberation, weathering steel 09CuPCrNi-A forms by adding the alloying element hot rolling that can improve atmospheric corrosion resistance on the basis of mild steel, it is organized as ferrite that is block and strip and adds a small amount of pearlite, phosphorus content is lower, plasticity and toughness higher, good welding performance, has good decay resistance; Stainless steel 022Cr17Ni12Mo2 mainly containing elements such as Cr, Ni, Mo, has good heat-and corrosion-resistant.Therefore, be connected with the material between the container storing urea at SCR reactor pipeline, the connection that substitutes low-alloy structural steel Q345 and the Stainless steel 316 L manufactured materials as SCR reactor can be connected with weathering steel 09CuPCrNi-A and stainless steel 022Cr17Ni12Mo2, thus obtain and both met the requirement that heat-and corrosion-resistant is good, intensity is high and welding usability is good, the effect reduced costs again.
Consult related data, the process of the maturation not yet having weathering steel 09CuPCrNi-A (Q355GNH) to weld with the different steel grade of stainless steel 022Cr17Ni12Mo2 at present and making the successful experience in SCR reactor.
Summary of the invention
The object of the invention is to, overcome the deficiency of spot ship diesel SCR reactor manufacture material, solve the manufacture welding procedure problem of SCR reactor, different steel grade welding procedure and the application thereof of a kind of stainless steel and weathering steel are provided, adopt flux-cored wire CO
2welding Machine connects mode, reaches the effect that the while that joint mechanical property being excellent, slag protection, weatherability are good, welding efficiency is higher, has the advantage that technique is simple, practical.
In order to achieve the above object, the technical scheme that the present invention takes is:
A different steel grade welding procedure for stainless steel and weathering steel, described stainless steel is 022Cr17Ni12Mo2, and described weathering steel is 09CuPCrNi-A, it is characterized in that: described different steel grade welding procedure adopts flux-cored wire CO
2welding Machine connects method, comprising:
1) GFS-316L flux-cored wire selected by welding material, and diameter is 1.2mm, and chemical composition meets standard A WSA5.22E316LT1-1;
2) welding point form adopts docking, and joint form is V-butt, and this bevel angle is 60 °, and root gap is 1-2mm;
3) weld seam adopts multilayer welding, and temperature is no more than 150 DEG C between layers.
The welding sequence of banjo fixing butt jointing is:
A. each 20mm in groove both sides after machining is polished, make it to expose metallic luster;
B. position welding, groove gap controls at 1-2mm;
C. the parameter identical with tack welding is adopted to carry out prime coat welding;
D. packed layer welding is carried out;
E. carrying out. reverse side asks root, and carries out capping 1 and weld;
F. carry out capping 2 to weld;
G. asbestic blanket is adopted to carry out insulation slow cooling.
The parameter of described different steel grade welding procedure in each operation welding is as follows:
Tack weld: shield gas flow rate 15-20L/min, welding current 120-130A, weldingvoltage 21-22V, speed of welding 25-35cm/min, reversal connection, the amplitude of oscillation is 1.0-3.0mm, heat input 8.0-10.0KJ/cm;
Prime coat weld seam: shield gas flow rate 15-20L/min, welding current 120-130A, weldingvoltage 21-22V, speed of welding 25-35cm/min, reversal connection, the amplitude of oscillation is 1.0-3.0mm, heat input 8.0-10.0KJ/cm;
Packed layer weld seam: shield gas flow rate 15-20L/min, welding current 130-150A, weldingvoltage 24-25V, speed of welding 25-35cm/min, reversal connection, the amplitude of oscillation is 4.0-5.0mm, heat input 9.0-11.0KJ/cm;
Capping 1 weld seam: shield gas flow rate 15-20L/min, welding current 150-170A, weldingvoltage 23-25V, speed of welding 25-35cm/min, reversal connection, the amplitude of oscillation is 5.0-6.0mm, heat input 12-14KJ/cm;
Capping 2 weld seam: shield gas flow rate 15-20L/min, welding current 160-180A, weldingvoltage 23-25V, speed of welding 22-23cm/min, reversal connection, the amplitude of oscillation is 6.0-8.0mm, heat input 17-19KJ/cm.
The application that the different steel grade welding procedure of described stainless steel and weathering steel manufactures at boat diesel engine SCR reactor.
Compared with prior art, the present invention has following benefit:
1) the present invention reasonably selects welding material, make the weld metal of formation play the element of corrosion resistance effect containing nickel, chromium, copper etc. simultaneously, ensure that the corrosion resistance of weld metal is equal to base metals, the even tissue of weathering steel 09CuPCrNi-A and stainless steel 022Cr17Ni12Mo2 different steel grade material welding point is tiny, be mainly austenite structure, improve the obdurability of Dissimilar Steel Welded Joint, corrosion resistance etc.
2) the present invention adopts flux-cored arc welding to connect, and not only have slag protection feature but also have semi-automatic welding advantage, deposition efficiency is high, improves production efficiency greatly.
3) present invention employs multilayer welding, make full use of the preheating of front layer weld seam to rear layer weld seam, rear layer weld seam to the thermal processes act of front layer weld seam, thus changes tissue and the stress distribution of welding point, simplify welding procedure, alleviate the labour intensity of workman.
4) comprehensive mechanical property and the structure property of the welding dissimilar materials joint obtained are excellent, reach the requirement of boat diesel engine SCR reactor, significant for the development promoting SCR reactor.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of 09CuPCrNi-A and 022Cr17Ni12Mo2 welding dissimilar materials technique double V-groove in the present invention.
Detailed description of the invention
Below in conjunction with Figure of description, the present invention will be further described
The weathering steel 09CuPCrNi-A that the present invention relates to and the chemical composition of stainless steel 022Cr17Ni12Mo2 list in table 1,2, and mechanical property lists in table 3,4.The production requirement of 09CuPCrNi-A weather-resistant steel plate meets standard " GB/T4171-2008 weatherproof structure steel ".
The chemical composition of table 109CuPCrNi-A steel plate
The mechanical property of table 209CuPCrNi-A steel plate
The chemical composition of table 3022Cr17Ni12Mo2 steel plate
The mechanical property of table 4022Cr17Ni12Mo2 steel plate
Employing FCAW welding method welding thickness of slab is 09CuPCrNi-A and the 022Cr17Ni12Mo2 dissimilar steel of 12mm, test plate (panel) is of a size of 300mmX150mmX12mm, capital thunder wlding GFS-316L selected by welding material, meet standard A WSA5.22E316LT1-1, KRII500 welding machine selected by welding equipment, welding sequence: a pre-assembled (splaying 1mm, other end gap is 1.5mm), the welding of positioning welding, prime coat, packed layer welding, back gouging, capping 1 weld, capping 2 welds, as shown in Figure 1.Welding parameter is as following table:
Table 509CuPCrNi-A and 022Cr17Ni12Mo2 welding parameter
Table 6 qualification of welding procedure table
Adopt technique and the welding method of the different steel weld of the present invention's design, the implementation result carrying out 09CuPCrNi-A and 022Cr17Ni12Mo2 welding is as shown in table 6.Through visual examination, confirm that external mass all meets the detection and assessment requirement of ENISO5817-2003 " melting-shortcoming evaluation of steel nickel titanium and titanium alloys " standard.Butt welded seam total length carries out ultrasonic examination inspection, confirms that internal soundness all reaches the requirement of JB/T4730.3-2005; The performance of bond pull: tensile strength is 520/535MPa, and rupture in 09CuPCrNi-A mother metal, and be away from weld heat-affected zone; Macroscopic view metallographic display full penetration, microcosmic metallographic display flawless, meets acceptance criteria GLII-3-2/GLII-3-3; The cold-bending property of joint: lateral bending α=180 °, Seam and heat effected zone on Extrude Face, there are no flaws on any direction; The impact property (20 DEG C) of joint: 09CuPCrNi-A heat affected area Ak >=20J; The maximum hardness of joint: HV10≤350, meets GLII-3-3 standard.
Adopt above-mentioned proposed dissimilar steel welding technology scheme, qualified Dissimilar Steel Welded Joint can be obtained, and its welding joint mechanical property meets the requirement of SCR reactor technology.This technical scheme can be applied to welding of weathering steel in SCR reactor and stainless steel steel position.
Claims (4)
1. a different steel grade welding procedure for stainless steel and weathering steel, described stainless steel is 022Cr17Ni12Mo2, and described weathering steel is 09CuPCrNi-A, it is characterized in that: described different steel grade welding procedure adopts flux-cored wire CO
2welding Machine connects method, comprising:
1) GFS-316L flux-cored wire selected by welding material, and diameter is 1.2mm, and chemical composition meets standard A WSA5.22E316LT1-1;
2) welding point form adopts docking, and joint form is V-butt, and this bevel angle is 60 °, and root gap is 1-2mm;
3) weld seam adopts multilayer welding, and temperature is no more than 150 DEG C between layers.
2. the different steel grade welding procedure of stainless steel as claimed in claim 1 and weathering steel, is characterized in that: the welding sequence of banjo fixing butt jointing is:
A. each 20mm in groove both sides after machining is polished, make it to expose metallic luster;
B. position welding, groove gap controls at 1-2mm;
C. the parameter identical with tack welding is adopted to carry out prime coat welding;
D. packed layer welding is carried out;
E. carrying out. reverse side asks root, and carries out capping 1 and weld;
F. carry out capping 2 to weld;
G. asbestic blanket is adopted to carry out insulation slow cooling.
3. the different steel grade welding procedure of stainless steel as claimed in claim 1 and weathering steel, is characterized in that: the parameter of described different steel grade welding procedure in each operation welding is as follows:
Tack weld: shield gas flow rate 15-20L/min, welding current 120-130A, weldingvoltage 21-22V, speed of welding 25-35cm/min, reversal connection, the amplitude of oscillation is 1.0-3.0mm, heat input 8.0-10.0KJ/cm;
Prime coat weld seam: shield gas flow rate 15-20L/min, welding current 120-130A, weldingvoltage 21-22V, speed of welding 25-35cm/min, reversal connection, the amplitude of oscillation is 1.0-3.0mm, heat input 8.0-10.0KJ/cm;
Packed layer weld seam: shield gas flow rate 15-20L/min, welding current 130-150A, weldingvoltage 24-25V, speed of welding 25-35cm/min, reversal connection, the amplitude of oscillation is 4.0-5.0mm, heat input 9.0-11.0KJ/cm;
Capping 1 weld seam: shield gas flow rate 15-20L/min, welding current 150-170A, weldingvoltage 23-25V, speed of welding 25-35cm/min, reversal connection, the amplitude of oscillation is 5.0-6.0mm, heat input 12-14KJ/cm;
Capping 2 weld seam: shield gas flow rate 15-20L/min, welding current 160-180A, weldingvoltage 23-25V, speed of welding 22-23cm/min, reversal connection, the amplitude of oscillation is 6.0-8.0mm, heat input 17-19KJ/cm.
4. the application that manufactures at boat diesel engine SCR reactor of the different steel grade welding procedure of a stainless steel as claimed in claim 1 and weathering steel.
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Cited By (4)
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| CN106695046A (en) * | 2017-01-19 | 2017-05-24 | 中车四方车辆有限公司 | Welding method for stainless steel plate and weather-resistant steel plate |
| CN106735757A (en) * | 2016-12-28 | 2017-05-31 | 宜昌市瑞洋机械制造有限公司 | A kind of carbon dioxide gas arc welding of austenitic stainless steel pressure vessels connects method |
| CN106825876A (en) * | 2017-03-23 | 2017-06-13 | 江苏信泰化工装备有限公司 | The welding method of the CO2 gas shielded arc weldings of large diameter pipeline foreign material |
| CN113399937A (en) * | 2021-05-14 | 2021-09-17 | 西安理工大学 | Copper/steel bimetal composite structural member combined with heat treatment process and preparation method thereof |
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Cited By (5)
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| CN106735757A (en) * | 2016-12-28 | 2017-05-31 | 宜昌市瑞洋机械制造有限公司 | A kind of carbon dioxide gas arc welding of austenitic stainless steel pressure vessels connects method |
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| CN113399937A (en) * | 2021-05-14 | 2021-09-17 | 西安理工大学 | Copper/steel bimetal composite structural member combined with heat treatment process and preparation method thereof |
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Address after: 200129 346, 2851 Pudong Avenue, Shanghai, Pudong New Area Patentee after: HUDONG HEAVY MACHINERY Co.,Ltd. Patentee after: CSSC MARINE POWER COMPONENTS Co.,Ltd. Patentee after: NANJING JIANGKE WELDING TECHNOLOGY Co.,Ltd. Address before: 200129 346, 2851 Pudong Avenue, Shanghai, Pudong New Area Patentee before: HUDONG HEAVY MACHINERY Co.,Ltd. Patentee before: SHANGHAI HULIN HEAVY INDUSTRY Co.,Ltd. Patentee before: NANJING JIANGKE WELDING TECHNOLOGY Co.,Ltd. |