CN104722890A - T91/T92 and HR3C dissimilar steel welding method - Google Patents
T91/T92 and HR3C dissimilar steel welding method Download PDFInfo
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- CN104722890A CN104722890A CN201510121875.1A CN201510121875A CN104722890A CN 104722890 A CN104722890 A CN 104722890A CN 201510121875 A CN201510121875 A CN 201510121875A CN 104722890 A CN104722890 A CN 104722890A
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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
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
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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 relates to the field of welding, and discloses a T91/T92 and HR3C dissimilar steel welding method. The welding method includes the following steps that 1, base metal of T91/T92 and HR3C dissimilar steel to be welded are preheated; 2, multi-layer welding is carried out on the preheated base metal of the T91/T92 and HR3C dissimilar steel and sequentially includes bottom layer welding, packing layer welding and surface layer welding, and interlayer temperature is 150 DEG C-200 DEG C; 3, postweld heat treatment is carried out on a T91/T92 and HR3C dissimilar steel welded joint obtained through welding. The tensile property, shock resistance and bending resistance of the welded joint obtained through the welding method are substantially improved, and the Brinell hardness of the welded joint meets related requirements of DL/T752-2001, DL 869-2004 and the like.
Description
Technical field
The present invention relates to the welding method of T91/T92 and HR3C dissimilar steel.
Background technology
In September, 2014, National Development and Reform Committee, Chinese Ministry of Environmental Protection and ministries and commissions of National Energy Board three combine and issue " coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014-2020) ".Require that newly-built coal fired power generation project adopts 600,000 kilowatts and above extra-supercritical unit.Domestic ultra supercritical 1,000,000 unit up to a hundred of having gone into operation and having built, more high parameter new and effective unit Program Construction and also had tens of what build, above-mentioned unit has all selected the heat resistance Steel materials such as T22, T91, T92, TP347H, Super304H, HR3C, but the raising of unit parameter means material require tolerance higher temperature and larger pressure.Therefore, in the manufacture, installation and maintenance process of Boiler of Ultra-supercritical Unit, whether the solder technology of Boiler of Ultra-supercritical Unit heat resistance material becomes can the core key technology of Effec-tive Function extra-supercritical unit.
At present, Dissimilar Steel Welded Joint ubiquity in the super-critical and ultra super-critical power unit of China, can be divided into two classes: austenitic steel and ferritic steel (A/F) welding point and ferritic steel and ferritic steel (F/F) welding point.Because description of materials is many, there is varied different combining form in dissimilar steel joint, makes new material different steel weld complication, diversification, T91/T92 and HR3C different steel weld is wherein typical representative.Mainly there is the lower defect of stretch-proof performance, shock resistance, bending resistance and Brinell hardness in the Dissimilar Steel Welded Joint that existing solder technology obtains, thus causes welding point to occur the problem such as weld crack and initial aging stage.
Therefore, need badly in the market find a kind of wide in range for welding T91/T92 and HR3C different steel weld operating procedure action pane that is simple, postwelding product, welding quality is high and welding point can have the welding method of the strong advantage of stretch-proof performance, shock resistance and bending resistance simultaneously, effectively to reduce the tendency of T91/T92 and HR3C Dissimilar Steel Welded Joint initial failure, ensure unit safety operation, T91/T92 and HR3C dissimilar steel can be applied widely in super-critical and ultra super-critical power unit.
Summary of the invention
The object of this invention is to provide the welding method of T91/T92 and HR3C dissimilar steel, welding method operating procedure of the present invention is simple and welding quality is high, the stretch-proof performance of T91/T92 and the HR3C Dissimilar Steel Welded Joint adopting welding method of the present invention to obtain, shock resistance and bending resistance are strengthened all significantly, and its Brinell hardness meets the related request of DL/T 752-2001 and DL 869-2004 etc., thus make to weld T91/T92 and the HR3C dissimilar steel obtained and can be applied widely in super-critical and ultra super-critical power unit.
The invention provides a kind of welding method of T91/T92 and HR3C dissimilar steel, this welding method comprises the following steps:
(1) T91/T92 and HR3C dissimilar steel mother metal to be welded is carried out preheating;
(2) described T91/T92 and the HR3C dissimilar steel mother metal after preheating is carried out multilayer welding, described multilayer welding comprises prime coat welding, packed layer welding and the welding of capping layer successively, and interlayer temperature is 150-200 DEG C, wherein,
The condition of described prime coat welding comprises: welding current is 80-90A, and weldingvoltage is 10-14V, and speed of welding is 30-40mm/min; The condition of described packed layer welding comprises: welding current is 90-100A, and weldingvoltage is 10-14V, and speed of welding is 40-50mm/min; The condition of described capping layer welding comprises: welding current is 90-100A, and weldingvoltage is 10-14V, and speed of welding is 40-50mm/min;
(3) T91/T92 and the HR3C Dissimilar Steel Welded Joint obtained after welding is carried out post weld heat treatment.
The stretch-proof performance of T91/T92 and the HR3C Dissimilar Steel Welded Joint after the welding obtained by technique scheme, shock resistance and bending resistance are strengthened all significantly, and its Brinell hardness meets the related request of DL/T 752-2001 and DL 869-2004 etc., thus T91/T92 and HR3C dissimilar steel can be applied in super-critical and ultra super-critical power unit widely.Particularly, the tensile strength R of T91/T92 and HR3C Dissimilar Steel Welded Joint
mv can reach more than 645MPa, anti-extension strength R
0.2pv can reach more than 370MPa and percentage elongation can reach more than 20%; Heat affected area, T91/T92 mother metal side Impact energy Ak v can reach more than 250J and heat affected area, HR3C mother metal side Impact energy Ak v can reach more than 110J, weld impingement merit Akv can reach more than 175J; Heat affected area, T91/T92 and HR3C mother metal side Brinell hardness is respectively 210-230HB and 205-214HB, weld seam Brinell hardness, 185-210HB.
Other features and advantages of the present invention are described in detail in detailed description of the invention part subsequently.
Detailed description of the invention
Below the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
The invention provides a kind of welding method of T91/T92 and HR3C dissimilar steel, this welding method comprises the following steps:
(1) T91/T92 and HR3C dissimilar steel mother metal to be welded is carried out preheating;
(2) described T91/T92 and the HR3C dissimilar steel mother metal after preheating is carried out multilayer welding, described multilayer welding comprises prime coat welding, packed layer welding and the welding of capping layer successively, and interlayer temperature is 150-200 DEG C, wherein, the condition of described prime coat welding comprises: welding current is 80-90A, weldingvoltage is 10-14V, and speed of welding is 30-40mm/min; The condition of described packed layer welding comprises: welding current is 90-100A, and weldingvoltage is 10-14V, and speed of welding is 40-50mm/min; The condition of described capping layer welding comprises: welding current is 90-100A, and weldingvoltage is 10-14V, and speed of welding is 40-50mm/min;
(3) T91/T92 and the HR3C Dissimilar Steel Welded Joint obtained after welding is carried out post weld heat treatment.
According to welding method of the present invention, under preferable case, in step (1), the temperature of described preheating is 200-300 DEG C, is more preferably 220-280 DEG C.To the preheated zone of preheating T91/T92 and HR3C dissimilar steel mother metal, there is no particular limitation in the present invention, and preferred preheated zone is be the region of 5-10mm apart from the end points of T91/T92 and HR3C dissimilar steel mother metal to be welded.
In welding method of the present invention, the method for described preheating can have multiple, and the heating means that those skilled in the art can use according to routine carry out preheating, such as, can adopt electrical heating method and/or flame heating.T91/T92 and HR3C dissimilar steel mother metal together to be welded is preferably heated within the scope of a little higher than above-mentioned preheat temperature 30-60 DEG C by the present invention, and then this steel pipe mother metal is cooled to 200-300 DEG C, make the more uniform temperature of preheating like this, be more conducive to the Dissimilar Steel Welded Joint that formation stretch-proof performance, shock resistance, bending resistance and Brinell hardness all significantly strengthen.
According to welding method of the present invention, under preferable case, in step (2), the welding rod model that described multilayer welding uses is at least one in ERNiCr-3, NiCrFe-3 and T-HR3C; More preferably, in situation, the welding rod model that described multilayer welding uses is ERNiCr-3.The above-mentioned welding rod of the present invention is adopted to carry out multilayer welding, the dissimilar steel mother metal that welding position can be made to melt and deposited metal (the welding rod part melted in weld seam) form continuous print solid solution, namely can form continuous print solid solution after dissimilar steel mother metal and the fusing of this different materials of welding rod.Like this, the precipitation of the generation that can prevent intermetallic compound and the residual components preventing solid solution, thus improve the welding performance of welding point.
In welding method of the present invention, to the not special requirement of core diameter that the prime coat welding in described multilayer welding, packed layer welding and the welding of capping layer use, those skilled in the art can select according to actual needs in the various scopes that this area routine uses, preferably, the core diameter that described multilayer welding uses is Φ 1.6mm-Φ 2.4mm.
According to welding method of the present invention, in step (2), carry out in welding position in multilayer welding termination process, interlayer temperature is controlled in the scope of 150-200 DEG C, so can reduce lasting heat input, reduce high-temperature residence time, improve molten bath crystalline state.
The control method of interlayer temperature of the present invention can adopt the conventional method used, such as can for the temperature using infrared thermometer to monitor welding position in whole welding process, when the temperature of welding position exceed the permission of preset temperature upper in limited time, stop welding operation, proceed temperature monitoring simultaneously; The temperature at position to be welded to be down under the permission close to preset temperature in limited time, then proceeds welding operation.
According to welding method of the present invention, in step (2), the mode of operation of described multilayer welding is: be welded into spaced multiple welding bead segmentation in the mode of backstep welding by every layer.Under preferable case, in two adjacent welding bead segmentations, interval 5-10mm between the receipts arc position of previous welding bead segmentation and the starting the arc position of a rear welding bead segmentation.So, stress distribution can be made even, avoid stress concentrate and cause the decline of welding quality.Further, according to of the present invention more preferred embodiment, after each welding bead segmentation welding of multiple welding bead segmentation, use hand hammer to knock this welding bead segmentation and heat affected area, until the surface of this welding bead segmentation and heat affected area is covered with pit.So, portion of residual stress can be eliminated further, and the stress distribution on the surface of welding bead segmentation and heat affected area is modified to compressive stress state by tensile stress state, thus effectively prevent the generation of crackle.
According to welding method of the present invention, under preferable case, in step (2), described multilayer welding is connected under Ar protective gas exists and carries out, and more preferably in situation, in described protective gas, the concentration of Ar is 99.99%.
In welding method of the present invention, the flow of preferred described protective gas can be 9-11L/min.
According to welding method of the present invention, under preferable case, this welding method offers V-butt in the welding position of described T91/T92 and HR3C dissimilar steel mother metal to be welded before being also included in the multilayer welding carried out described in step (2).Described V-butt is formed by electric angle grinder reconditioning, after reconditioning, the surface finish at mother metal position corresponding for described V-butt is clean, and exposes metallic luster.
In welding method of the present invention, under preferable case, the unlimited angle of described V-butt is 55 °-60 °, and the percentage (i.e. penetration ratio) that the mother metal of fusing can be made to account for welding bead metal reduces.In welding process, because excessive penetration ratio can increase the dilution rate of weld seam, make transition zone more obvious, and the unlimited angle of above-mentioned preferred described V-butt can control the thickness of transition zone, thus improve the welding performance of welding point.
According to welding method of the present invention, T91/T92 and HR3C Dissimilar Steel Welded Joint in the present invention adopts post weld heat treatment after welding, the performance of welding point significantly improves, and the process window of welding parameter is larger, is beneficial to the guarantee of field popularization application and welding quality.Under preferable case, in step (3), described heat treated temperature is 740-760 DEG C, is preferably 745-755 DEG C; Time is 1.5-2.5h, is preferably 1.8-2.2h.
In welding method of the present invention, to the equipment of described welding, there is no particular limitation, and the various welding equipments that those skilled in the art can use according to routine be selected, and such as the present invention can adopt Miller electric welding machine to weld.
According to a kind of concrete embodiment of welding method of the present invention, the welding method of described T91/T92 and HR3C dissimilar steel can comprise the following steps: get one section of HR3C steel and one section of T91/T92 steel mother metal.The V-butt that unlimited angle is 55 °-60 ° is offered in the welding position of two sections of T91/T92 and HR3C dissimilar steel mother metals to be welded, then after two sections of dissimilar steel mother metals being preheated to 230-360 DEG C, air cooling is to 200-300 DEG C (preheat temperature), then be ERNiCr-3 at pure Ar protective gas and model, under the existence of at least one welding rod in NiCrFe-3 and T-HR3C, Miller welding machine is used to carry out prime coat welding successively at described T91/T92 and HR3C dissimilar steel V-butt place, packed layer welding and the welding of capping layer, the core diameter used is Φ 1.6mm-Φ 2.4mm.Spaced multiple welding bead segmentation is welded in the mode of backstep welding by every layer in welding, in two adjacent welding bead segmentations, interval 5-10mm between the receipts arc position of previous welding bead segmentation and the starting the arc position of a rear welding bead segmentation, thus two sections of T91/T92 and HR3C dissimilar steel mother metals are welded together, control interlayer temperature is 150-200 DEG C, heat-treat after welding, described heat treated temperature is 740-760 DEG C, time is 1.5-2.5h, and the condition of wherein welding is as shown in table 1 below:
Table 1
| Welding current A | Weldingvoltage V | Speed of welding mm/min | |
| Prime coat welds | 80-90 | 10-14 | 30-40 |
| Packed layer welds | 90-100 | 10-14 | 40-50 |
| Capping layer welds | 90-100 | 10-14 | 40-50 |
Below will be described the present invention by embodiment.
Embodiment 1-6 is for illustration of the welding method of T91/T92 and HR3C dissimilar steel provided by the invention
Embodiment 1
Get one section of HR3C steel and one section of T91 steel mother metal.The V-butt that unlimited angle is 60 ° is offered in the welding position of two sections of T91 and HR3C dissimilar steel mother metals to be welded, then air cooling to 220 DEG C (preheat temperature) after two sections of T91 and HR3C dissimilar steel mother metals being preheated to 260 DEG C, under the existence of Ar protective gas and welding rod ERNiCr-3 (core diameter is Φ 1.6mm), (welding current is 80A to use Miller welding machine to carry out prime coat welding successively at described dissimilar steel V-butt place, weldingvoltage is 12V, speed of welding is 30mm/min), (welding current is 90A in packed layer welding, weldingvoltage is 12V, speed of welding is 40mm/min) and capping layer welds, and (welding current is 90A, weldingvoltage is 12V, speed of welding is 40mm/min), controlling interlayer temperature is 200 DEG C, spaced multiple welding bead segmentation is welded in backstep welding mode by every layer in welding, interval 10mm between the receipts arc position of previous welding bead segmentation and the starting the arc position of a rear welding bead segmentation, thus two sections of T91 and HR3C dissimilar steel mother metals are welded together, heat-treat after welding, heat treated temperature is 740 DEG C, time is 2.5h, obtains welding product X1.
Embodiment 2
Get one section of HR3C steel and one section of T92 steel mother metal.The V-butt that unlimited angle is 55 ° is offered in the welding position of two sections of T92 and HR3C dissimilar steel mother metals to be welded, then air cooling to 260 DEG C (preheat temperature) after two sections of T92 and HR3C dissimilar steel mother metals being preheated to 350 DEG C, under the existence of Ar protective gas and welding rod ERNiCr-3 (core diameter is Φ 2.4mm), (welding current is 90A to use Miller welding machine to carry out prime coat welding successively at described dissimilar steel V-butt place, weldingvoltage is 14V, speed of welding is 40mm/min), (welding current is 100A in packed layer welding, weldingvoltage is 14V, speed of welding is 50mm/min) and capping layer welds, and (welding current is 100A, weldingvoltage is 14V, speed of welding is 50mm/min), controlling interlayer temperature is 180 DEG C, spaced multiple welding bead segmentation is welded in backstep welding mode by every layer in welding, interval 8mm between the receipts arc position of previous welding bead segmentation and the starting the arc position of a rear welding bead segmentation, thus two sections of T92 and HR3C dissimilar steel mother metals are welded together, heat-treat after welding, heat treated temperature is 745 DEG C, time is 1.8h, obtains welding product X2.
Embodiment 3
Get one section of HR3C steel and one section of T91 steel mother metal.The V-butt that unlimited angle is 58 ° is offered in the welding position of two sections of T91 and HR3C dissimilar steel mother metals to be welded, then air cooling to 280 DEG C (preheat temperature) after two sections of T91 and HR3C dissimilar steel mother metals being preheated to 310 DEG C, be under the existence of the welding rod of ERNiCr-3 (core diameter is 1.6mm) at Ar protective gas and model, (welding current is 90A to use Miller welding machine to carry out prime coat welding successively at described T91 and HR3C dissimilar steel V-butt place, weldingvoltage is 14V, speed of welding is 40mm/min), (welding current is 100A in packed layer welding, weldingvoltage is 14V, speed of welding is 45mm/min) and capping layer welds, and (welding current is 100A, weldingvoltage is 14V, speed of welding is 45mm/min), controlling interlayer temperature is 150 DEG C, spaced multiple welding bead segmentation is welded in backstep welding mode by every layer in welding, interval 8mm between the receipts arc position of previous welding bead segmentation and the starting the arc position of a rear welding bead segmentation, thus two sections of T91 and HR3C dissimilar steel mother metals are welded together, heat-treat after welding, heat treated temperature is 750 DEG C, time is 1.5h, obtains welding product X3.
Embodiment 4
Adopt the welding method identical with embodiment 1 to carry out, difference is, the unlimited angle offering V-butt before welding in the welding position of described dissimilar steel mother metal to be welded is 45 °, obtains welding product X4.
Embodiment 5
Adopt the welding method identical with embodiment 1 to carry out, difference is, the preheat temperature of T91 and HR3C dissimilar steel mother metal to be welded is 150 DEG C, obtains welding product X5.
Embodiment 6
Adopt the welding method identical with embodiment 1 to carry out, difference is, the heat treatment temperature of the welding point of T91 and HR3C dissimilar steel mother metal is 800 DEG C, obtains welding product X6.
Comparative example 1-3 is for illustration of the welding method of T91/T92 and the HR3C dissimilar steel of reference
Comparative example 1
Adopt the welding method identical with embodiment 1 to carry out, difference is, interlayer temperature is 250 DEG C, obtains welding product D1.
Comparative example 2
Adopt the welding method identical with embodiment 1 to carry out, difference is, T91 and HR3C dissimilar steel mother metal to be welded does not carry out weld preheating, obtains welding product D3.
Comparative example 3
Adopt the welding method identical with embodiment 1 to carry out, difference is, does not carry out post weld heat treatment, obtains welding product D4.
Test case
(1) stretch-proof performance test
The method specified according to GB2651-2008 carries out the test of tensile property respectively to the welding point of welding product X1-X6 and D1-D3 of embodiment 1-6 and comparative example 1-3 gained, the result of gained is as shown in table 2.
(2) bending resistance test
The method specified according to GB/T2653-2008 carries out the test of bending property respectively to the welding point of welding product X1-X5 and D1-D3 of embodiment 1-6 and comparative example 1-3 gained, the result of gained is as shown in table 2.
(3) shock resistance test
The method specified according to GB2650-2008 carries out the test of impact property respectively to the welding point of welding product X1-X6 and D1-D3 of embodiment 1-6 and comparative example 1-3 gained, the result of gained is as shown in table 2.
(4) Brinell hardness test
The method specified according to GB/T 231.1-2009 carries out the test of Brinell hardness respectively to the welding point of welding product X1-X6 and D1-D3 of embodiment 1-6 and comparative example 1-3 gained, the result of gained is as shown in table 2.
From the results shown in Table 2, the stretch-proof performance of the welding point of T91/T92 and the HR3C dissimilar steel adopting welding method of the present invention to obtain, shock resistance and bending resistance all obtain significant enhancing, and its Brinell hardness meets the related request of DL/T 752-2001 and DL 869-2004 etc.Particularly, the tensile strength R of T91/T92 and HR3C Dissimilar Steel Welded Joint
mv can reach more than 645MPa, anti-extension strength R
0.2pv can reach more than 370MPa and percentage elongation can reach more than 20%; Heat affected area, T91/T92 mother metal side Impact energy Ak v can reach more than 250J and heat affected area, HR3C mother metal side ballistic work can reach more than 110J, weld impingement merit Akv can reach more than 175J; Heat affected area, T91/T92 and HR3C mother metal side Brinell hardness is respectively 210-230HB and 205-215HB, and weld seam Brinell hardness is 185-210HB.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Claims (10)
1. a welding method for T91/T92 and HR3C dissimilar steel, wherein, this welding method comprises the following steps:
(1) T91/T92 and HR3C dissimilar steel mother metal to be welded is carried out preheating;
(2) described T91/T92 and the HR3C dissimilar steel mother metal after preheating is carried out multilayer welding, described multilayer welding comprises prime coat welding, packed layer welding and the welding of capping layer successively, and interlayer temperature is 150-200 DEG C, wherein,
The condition of described prime coat welding comprises: welding current is 80-90A, and weldingvoltage is 10-14V, and speed of welding is 30-40mm/min; The condition of described packed layer welding comprises: welding current is 90-100A, and weldingvoltage is 10-14V, and speed of welding is 40-50mm/min; The condition of described capping layer welding comprises: welding current is 90-100A, and weldingvoltage is 10-14V, and speed of welding is 40-50mm/min;
(3) T91/T92 and the HR3C Dissimilar Steel Welded Joint obtained after welding is carried out post weld heat treatment.
2. welding method according to claim 1, wherein, in step (1), the temperature of described preheating is 200-300 DEG C, is preferably 220-280 DEG C.
3. welding method according to claim 1, wherein, in step (2), the welding rod model that described multilayer welding uses is at least one in ERNiCr-3, NiCrFe-3 and T-HR3C;
Preferably, the welding rod model that described multilayer welding uses is ERNiCr-3.
4. welding method according to claim 3, wherein, the core diameter that described multilayer welding uses is Φ 1.6mm-Φ 2.4mm.
5., according to the welding method in claim 1,3 and 4 described in any one, wherein, in step (2), the mode of operation of described multilayer welding is: be welded into spaced multiple welding bead segmentation in the mode of backstep welding by every layer.
6. welding method according to claim 5, wherein, in two adjacent welding bead segmentations, interval 5-10mm between the receipts arc position of previous welding bead segmentation and the starting the arc position of a rear welding bead segmentation.
7., according to the welding method in claim 1 and 3-6 described in any one, wherein, in step (2), described multilayer welding is connected under Ar protective gas exists and carries out.
8. welding method according to claim 7, wherein, the flow of described protective gas is 9-11L/min.
9. welding method according to claim 1, wherein, this welding method offers V-butt in the welding position of described T91/T92 and HR3C dissimilar steel to be welded before being also included in the multilayer welding carried out described in step (2);
Preferably, the unlimited angle of described V-butt is 55 °-60 °.
10. welding method according to claim 1, wherein, in step (3), described heat treated temperature is 745-755 DEG C, and the time is 1.5-2.5h.
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| CN113399864A (en) * | 2021-08-05 | 2021-09-17 | 河北省特种设备监督检验研究院 | Welding method and welding wire for T91 and TP347H dissimilar steels |
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| CN107498143A (en) * | 2017-08-18 | 2017-12-22 | 中国核工业二三建设有限公司 | The welding method of P355NH and 18MnD5 dissimilar steels |
| CN107699793A (en) * | 2017-10-23 | 2018-02-16 | 中国电建集团河南工程公司 | Novel austenitic heat-resistance steel Super304H joints wlding and its welding procedure |
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| CN108994430A (en) * | 2018-09-05 | 2018-12-14 | 中国核工业二三建设有限公司 | The welding method of Nickel-Based Steel and carbon steel dissimilar material pipeline |
| CN112326658A (en) * | 2020-10-30 | 2021-02-05 | 西安热工研究院有限公司 | Method for confirming parameters during equivalent temperature calculation of boiler tube |
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| CN117206641A (en) * | 2023-11-08 | 2023-12-12 | 江苏港丰锅炉有限公司 | Welding method of T92 pipe and TP310HCbN pipe |
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