CN114054907A - S31254 and T91 dissimilar steel welding and heat treatment method - Google Patents
S31254 and T91 dissimilar steel welding and heat treatment method Download PDFInfo
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- CN114054907A CN114054907A CN202111612010.7A CN202111612010A CN114054907A CN 114054907 A CN114054907 A CN 114054907A CN 202111612010 A CN202111612010 A CN 202111612010A CN 114054907 A CN114054907 A CN 114054907A
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- 238000003466 welding Methods 0.000 title claims abstract description 186
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000010438 heat treatment Methods 0.000 title claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 37
- 239000010959 steel Substances 0.000 title claims abstract description 37
- 239000007789 gas Substances 0.000 claims description 31
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 30
- 238000001514 detection method Methods 0.000 claims description 21
- 229910052786 argon Inorganic materials 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 230000005674 electromagnetic induction Effects 0.000 claims description 10
- 206010070834 Sensitisation Diseases 0.000 claims description 8
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 8
- 230000008313 sensitization Effects 0.000 claims description 8
- 210000001503 joint Anatomy 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 239000001307 helium Substances 0.000 claims description 5
- 229910052734 helium Inorganic materials 0.000 claims description 5
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 5
- 230000035515 penetration Effects 0.000 claims description 5
- 230000037452 priming Effects 0.000 claims description 5
- 238000009423 ventilation Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 4
- 238000013316 zoning Methods 0.000 abstract description 2
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 6
- 238000004321 preservation Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 229910000734 martensite Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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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
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Organic Chemistry (AREA)
- Arc Welding In General (AREA)
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Abstract
The invention provides a method for welding and heat treating dissimilar steel of S31254 and T91, which comprises the steps of groove treatment, groove assembly and positioning, tool protection and shielding gas setting, welding, heat treatment and the like. The invention adopts the process parameters of all-position automatic welding and zoning of the pipeline, ensures the dynamic balance of the molten pool in the circumferential direction of the fixed welding port, ensures the forming of automatic backing welding, solves the problem of backing welding and improves the efficiency of a welding line.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a dissimilar steel welding and heat treatment method of S31254 and T91.
Background
The S31254 material is generally used in petrochemical, high temperature desulfurizing, ocean platform and other apparatus, and is one kind of high molybdenum and high nitrogen austenitic stainless steel alloy with very low carbon content. Because the alloy element is rich and higher than that of the common austenitic stainless steel, the sensitivity of welding hot cracks is greatly increased, and the welding difficulty is further increased. Meanwhile, the S31254 material is inevitably connected with other high temperature heat resistant steel in many devices, namely, welding of different types of steel exists.
The S31254 and T91 pipe butt weld belongs to austenite and martensite structure types in dissimilar steel welding joints, the linear expansion coefficient of S31254 is far greater than that of T91 steel, large thermal stress and deformation are generated during traditional manual arc welding, and meanwhile, the problems of carbon migration, element dilution, hydrogen-induced stripping, welding defects and the like are further aggravated due to the difference of chemical components, so that the hardness, impact and high temperature resistance of the weld are enabled to be rapidly failed. Although the post-welding heat treatment can improve the performance of the welded joint of dissimilar steels, T91 is an improved 9Cr-1Mo air-cooled martensitic steel, the annealing temperature of the heat treatment is most suitable at 740-760 ℃, and the S31254 of the super austenitic stainless steel is easy to generate brittle interstitial phase in the sensitization temperature range of 450-850 ℃, so that the heat treatment at 760 ℃ on one side of the T91 steel is particularly important, and the S31254 side is lower than the sensitization temperature.
Therefore, research and development and innovation need to be started from key links such as blanking of materials, groove processing, welding material selection, shielding gas types, welding process parameter setting, electromagnetic induction postweld heat treatment and the like.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a dissimilar steel welding and heat treatment method for S31254 and T91, and aims to improve the quality of a welding joint of super austenitic stainless steels S31254 and T91.
The invention provides a method for welding and heat treating dissimilar steel of S31254 and T91, which comprises the following steps:
s1, groove treatment: respectively carrying out cutting-off, single-edge J-shaped groove processing and groove detection within a range of 100 mm on S31254 and T91;
s2, groove assembling and positioning: butting the single-side J-shaped groove of the S31254 with the single-side J-shaped groove of the T91, and positioning by adopting a positioning block;
s3, protection tool and protection gas setting: respectively arranging back protection tools on the back of the welding line of S31254 and the back of the welding line of T91, and carrying out ventilation protection;
s4, welding: in the horizontal butt joint position of S31254 and T91, adopting full-position pulse automatic argon tungsten-arc welding to implement priming, filling and covering of dissimilar steel;
wherein, the welding process parameters of the backing welding are divided into five intervals, and the arcing position is in the direction of 10-11 points;
interval 1: peak current IPeak(s)95-99A, base current IBase of45-48; the arc voltage U is 10-11V, the wire feeding speed is 400 mm/min and 410 mm/min, and the welding gun walking speed is 78-80 mm/min;
interval 2: peak current IPeak(s)95-99A, base current IBase of45-50; the arc voltage U is 10-11V, the wire feeding speed is 400 mm/min and 410 mm/min, and the welding gun walking speed is 78-80 mm/min;
interval 3: peak current IPeak(s)95-99A, base current IBase of45-50; the arc voltage U is 10-11V, the wire feeding speed is 400 mm/min and 410 mm/min, and the welding gun walking speed is 78-80 mm/min;
the 4 th interval: peak current IPeak(s)95-99A, base current IBase of45-50; the arc voltage U is 10-11V, the wire feeding speed is 400 mm/min and 410 mm/min, and the welding gun walking speed is 78-80 mm/min;
interval 5: peak current IPeak(s)95-99A, base current IBase of45-50; the arc voltage U is 10-11V, the wire feeding speed is 400 mm/min and 410 mm/min, and the welding gun walking speed is 78-80 mm/min;
the welding process parameters of the filling welding and the cover surface welding are divided into four intervals, and the starting arc position is in the direction of 12-1 points;
interval 1: peak current IPeak(s)95-99A, base current IBase of45-48; the arc voltage U is 10-11V, the wire feeding speed is 400 mm/min and 410 mm/min, and the welding gun walking speed is 78-80 mm/min;
interval 2: peak current IPeak(s)95-99A, base current IBase of45-50; the arc voltage U is 10-11V, the wire feeding speed is 400 mm/min and 410 mm/min, and the welding gun walking speed is 78-80 mm/min;
interval 3: peak current IPeak(s)95-99A, base current IBase of45-50; the arc voltage U is 10-11V, the wire feeding speed is 400 mm/min and 410 mm/min, and the welding gun walking speed is 78-80 mm/min;
zone 4The method comprises the following steps: peak current IPeak(s)95-99A, base current IBase of45-50; the arc voltage U is 10-11V, the wire feeding speed is 400 mm/min and 410 mm/min, and the welding gun walking speed is 78-80 mm/min;
s5, heat treatment: locally heating the welded dissimilar steel pipeline circular seam to 745 +/-5 ℃.
Preferably, in S1, the single-sided J-shaped groove has a groove angle of 15 to 25 °, a curvature R of 2 mm, a single-sided elongation of 2 mm, and a blunt edge thickness of 1.5 mm.
Preferably, in S1, the groove detection within the range of 100 mm on the S31254 side is completed with 100% PT penetration detection; and finishing groove detection within a range of 100 mm on the T91 side by adopting 100% UT ultrasonic detection.
Preferably, in S2, the butt gap is 0 to 0.5 mm, and the variation of the inner and outer walls of the groove is within 0.5 mm.
Preferably, in S3, the torch shielding gas is 96% by volume of argon +2% by volume of nitrogen +2% by volume of helium, and the backside shielding gas is 95% by volume of argon +5% by volume of nitrogen.
Preferably, in S4, AWSA 5.14: ERNiCrMo-10, diameter of 1.0 mm.
Preferably, in S4, during welding, the pipeline all-position TIG digital automatic pipe welding machine and the matched rigid snap ring TIG welding gun are used, and the polarity of the welding power source is set to be direct current pulse positive connection.
Preferably, in S4, in the backing weld, the fill weld, and the cap weld, the arc-off position and the arc-on position overlap by not less than 5 °.
Preferably, in S4, the T91 side is preheated before welding, and the preheating temperature is 220-250 ℃.
Preferably, in S5, during the heat treatment, the copper tube heated by electromagnetic induction is used to control the temperature of the S31254 side, and when the preset constant temperature is reached, the circulating water system is started to control the constant temperature of the S31254 side, so as to ensure that the temperature is below the sensitization temperature.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts the process parameters of all-position automatic welding and zoning of the pipeline, ensures the dynamic balance of the molten pool in the circumferential direction of the fixed welding port, ensures the forming of automatic backing welding, solves the problem of backing welding and improves the efficiency of a welding line.
2. The invention adopts a stepped electromagnetic induction heat treatment mode, thereby not only ensuring that the heat treatment temperature of the austenitic stainless steel side can be controlled below the sensitization temperature, preventing the generation of a brittle interstitial phase of the structure, but also ensuring that the tempering heat treatment process of the martensite structure at the TP91 side meets the requirements.
3. The austenitic stainless steel and martensite heat-resistant steel welding seam prepared by the method can effectively obstruct carbon migration, prevent a hardened layer from appearing without adopting a surfacing isolation layer, reduce the structural stress of the welding seam, reduce the generation of welding defects, improve the high-temperature corrosion resistance of the welding seam, enhance the impact toughness of a welding part and ensure the lasting effective performance of the welding seam.
Drawings
FIG. 1 is a schematic structural diagram of a single-sided J-groove in an embodiment of the present invention.
FIG. 2 is a schematic view of a backing weld in an embodiment of the present invention.
FIG. 3 is a schematic illustration of a fill weld and a cap weld in an embodiment of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Example 1
A dissimilar steel welding and heat treatment method of S31254 and T91 includes the following steps:
s1, groove treatment: cutting off and processing a single-side J-shaped groove of S31254 and T91 respectively by using an external clamping type hydraulic tube cutting groove machine, wherein the groove angle of the single-side J-shaped groove is 15 degrees, the radian R is 2 mm, the single-side elongation is 2 mm, and the blunt edge thickness is 1.5 mm; groove detection within a range of 100 mm on the S31254 side is completed by adopting 100% PT penetration detection, and groove detection within a range of 100 mm on the T91 side is completed by adopting 100% UT ultrasonic detection;
s2, groove assembling and positioning: butting the single-sided J-shaped groove of the S31254 with the single-sided J-shaped groove of the T91, wherein the butting gap is 0mm, the dislocation quantity of the inner wall and the outer wall of the groove is within 0.5 mm, and positioning by adopting four positioning blocks which are symmetrically arranged and are fixed by electric welding;
s3, protection tool and protection gas setting: respectively arranging back protection tools on the back of the welding line of S31254 and the back of the welding line of T91, and carrying out ventilation protection; the back protection tool consists of a rigid telescopic rod and two flexible rubber cover plates; the welding gun shielding gas is 96 volume percent of argon gas, 2 volume percent of nitrogen gas and 2 volume percent of helium gas, and the back surface shielding gas is 95 volume percent of argon gas and 5 volume percent of nitrogen gas;
s4, welding: before welding, respectively polishing the inner and outer burrs of the groove at the S31254 side and the groove at the T91 side by a right-angle grinding machine; the method comprises the following steps of finishing the setting of 45 out-of-interval parameters such as 'arc striking mode', 'current mode', 'pre-gas feeding time' and the like, and 15 in-interval parameters such as 'interval number' and 'current magnitude', 'wire feeding speed', 'yaw parameter' and the like in each interval on a programming interface of a welding machine; preheating one side of T91 at 220 ℃;
during welding, AWSA 5.14: ERNiCrMo-10, welding wire with diameter of phi 1.0 mm; the method comprises the following steps that a pipeline all-position TIG digital automatic pipe welding machine and a matched rigid snap ring TIG welding gun are used, and the polarity of a welding power supply is set to be direct-current pulse positive connection;
in the horizontal butt joint position of S31254 and T91, adopting full-position pulse automatic argon tungsten-arc welding to implement priming, filling and covering of dissimilar steel;
wherein, the welding process parameters of the backing welding are divided into five intervals, and the arcing position is in the direction of 10-11 points;
interval 1: peak current IPeak(s)95A, base current IBase of45, percent; the arc voltage U is 10V, the wire feeding speed is 400 mm/min, and the welding gun walking speed is 78 mm/min;
interval 2: peak current IPeak(s)95A, base current IBase of45, percent; the arc voltage U is 10V, the wire feeding speed is 400 mm/min, and the welding gun walking speed is 78 mm/min；
Interval 3: peak current IPeak(s)95A, base current IBase of45, percent; the arc voltage U is 10V, the wire feeding speed is 400 mm/min, and the welding gun walking speed is 78 mm/min;
the 4 th interval: peak current IPeak(s)95A, base current IBase of45, percent; the arc voltage U is 10V, the wire feeding speed is 400 mm/min, and the welding gun walking speed is 78 mm/min;
interval 5: peak current IPeak(s)95A, base current IBase of45, percent; the arc voltage U is 10V, the wire feeding speed is 400 mm/min, and the welding gun walking speed is 78 mm/min;
the welding process parameters of the filling welding and the cover surface welding are divided into four intervals, and the starting arc position is in the direction of 12-1 points;
interval 1: peak current IPeak(s)95A, base current IBase of45, percent; the arc voltage U is 10V, the wire feeding speed is 400 mm/min, and the welding gun walking speed is 78 mm/min;
interval 2: peak current IPeak(s)95A, base current IBase of45, percent; the arc voltage U is 10V, the wire feeding speed is 400 mm/min, and the welding gun walking speed is 78 mm/min;
interval 3: peak current IPeak(s)95A, base current IBase of45, percent; the arc voltage U is 10V, the wire feeding speed is 400 mm/min, and the welding gun walking speed is 78 mm/min;
the 4 th interval: peak current IPeak(s)95A, base current IBase of45, percent; the arc voltage U is 10V, the wire feeding speed is 400 mm/min, and the welding gun walking speed is 78 mm/min;
in the backing welding, the filling welding and the cover surface welding, the arc-closing position and the arc-starting position are overlapped by 5 degrees;
s5, heat treatment: adopting a step-type electromagnetic induction heat treatment mode to locally heat the welded dissimilar steel pipeline circular seam to 740 ℃, wherein the heating and cooling speed is 200 ℃/h, and the heat preservation time is deltaEffective thickness of weldCalculating the thickness of/25 mm;
meanwhile, two groups of independent square copper tubes heated by electromagnetic induction are arranged in the same device to respectively heat S31254 and TP91, the temperature of one side of S31254 is controlled to be 420 +/-10 ℃ through an intelligent unit, the temperature of one side of TP91 is controlled to be 760 +/-10 ℃ through the intelligent unit, the heating temperature and the cooling temperature are controlled to be 50-150 ℃/h, and the heat preservation time is 15 min; and during heat treatment, when the temperature of the S31254 side reaches the set temperature of 420 ℃, starting a circulating water system to perform constant temperature control on the S31254 side, and ensuring that the temperature is below the sensitization temperature.
Example 2
A dissimilar steel welding and heat treatment method of S31254 and T91 includes the following steps:
s1, groove treatment: cutting off and processing a single-side J-shaped groove of S31254 and T91 respectively by using an external clamping type hydraulic tube cutting groove machine, wherein the groove angle of the single-side J-shaped groove is 20 degrees, the radian R is 2 mm, the single-side elongation is 2 mm, and the blunt edge thickness is 1.5 mm; groove detection within a range of 100 mm on the S31254 side is completed by adopting 100% PT penetration detection, and groove detection within a range of 100 mm on the T91 side is completed by adopting 100% UT ultrasonic detection;
s2, groove assembling and positioning: butting the single-side J-shaped groove of the S31254 with the single-side J-shaped groove of the T91, wherein the butting gap is 0.3 mm, the dislocation quantity of the inner wall and the outer wall of the groove is within 0.5 mm, and positioning by adopting four positioning blocks which are symmetrically arranged and are fixed by electric welding;
s3, protection tool and protection gas setting: respectively arranging back protection tools on the back of the welding line of S31254 and the back of the welding line of T91, and carrying out ventilation protection; the back protection tool consists of a rigid telescopic rod and two flexible rubber cover plates; the welding gun shielding gas is 96 volume percent of argon gas, 2 volume percent of nitrogen gas and 2 volume percent of helium gas, and the back surface shielding gas is 95 volume percent of argon gas and 5 volume percent of nitrogen gas;
s4, welding: before welding, respectively polishing the inner and outer burrs of the groove at the S31254 side and the groove at the T91 side by a right-angle grinding machine; the method comprises the following steps of finishing the setting of 45 out-of-interval parameters such as 'arc striking mode', 'current mode', 'pre-gas feeding time' and the like, and 15 in-interval parameters such as 'interval number' and 'current magnitude', 'wire feeding speed', 'yaw parameter' and the like in each interval on a programming interface of a welding machine; preheating one side of T91 at 230 ℃;
during welding, AWSA 5.14: ERNiCrMo-10, welding wire with diameter of phi 1.0 mm; the method comprises the following steps that a pipeline all-position TIG digital automatic pipe welding machine and a matched rigid snap ring TIG welding gun are used, and the polarity of a welding power supply is set to be direct-current pulse positive connection;
in the horizontal butt joint position of S31254 and T91, adopting full-position pulse automatic argon tungsten-arc welding to implement priming, filling and covering of dissimilar steel;
wherein, the welding process parameters of the backing welding are divided into five intervals, and the arcing position is in the direction of 10-11 points;
interval 1: peak current IPeak(s)97A, base current IBase of46; the arc voltage U is 10V, the wire feeding speed is 405 mm/min, and the welding gun walking speed is 79 mm/min;
interval 2: peak current IPeak(s)98A, base current IBase of47; the arc voltage U is 11V, the wire feeding speed is 406 mm/min, and the welding gun walking speed is 79 mm/min;
interval 3: peak current IPeak(s)96A, base current IBase of48; the arc voltage U is 10V, the wire feeding speed is 403 mm/min, and the welding gun walking speed is 79 mm/min;
the 4 th interval: peak current IPeak(s)96A, base current IBase of49; the arc voltage U is 11V, the wire feeding speed is 407 mm/min, and the welding gun walking speed is 79 mm/min;
interval 5: peak current IPeak(s)98A, base current IBase of47; the arc voltage U is 10V, the wire feeding speed is 408 mm/min, and the welding gun walking speed is 79 mm/min;
the welding process parameters of the filling welding and the cover surface welding are divided into four intervals, and the arc starting position is in the direction of 12 points;
interval 1: peak current IPeak(s)97A, base current IBase of46; the arc voltage U is 10V, the wire feeding speed is 402 mm/min, and the welding gun walking speed is 79 mm/min;
interval 2: peak current IPeak(s)96A, base current IBase of47; the arc voltage U is 11V, the wire feeding speed is 405 mm/min, and the welding gun walking speed is 79 mm/min;
interval 3: peak current IPeak(s)98A, base current IBase of48; the arc voltage U is 10V, the wire feeding speed is 407 mm/min, and the welding gun walking speed is 79 mm/min;
the 4 th interval: peak current IPeak(s)96A, base current IBase of49; the arc voltage U is 11V, the wire feeding speed is 406 mm/min, and the welding gun walking speed is 79 mm/min;
in the backing welding, the filling welding and the cover surface welding, the arc-closing position and the arc-starting position are overlapped by 5 degrees;
s5, heat treatment: adopting a step-type electromagnetic induction heat treatment mode to locally heat the welded dissimilar steel pipeline circular seam to 745 ℃, the temperature rising and reducing speed is 200 ℃/h, and the heat preservation time is deltaEffective thickness of weldCalculating the thickness of/25 mm;
meanwhile, two groups of independent square copper tubes heated by electromagnetic induction are arranged in the same device to respectively heat S31254 and TP91, the temperature of one side of S31254 is controlled to be 420 +/-10 ℃ through an intelligent unit, the temperature of one side of TP91 is controlled to be 760 +/-10 ℃ through the intelligent unit, the heating temperature and the cooling temperature are controlled to be 50-150 ℃/h, and the heat preservation time is 15 min; and during heat treatment, when the temperature of the S31254 side reaches the set temperature of 420 ℃, starting a circulating water system to perform constant temperature control on the S31254 side, and ensuring that the temperature is below the sensitization temperature.
Example 3
A dissimilar steel welding and heat treatment method of S31254 and T91 includes the following steps:
s1, groove treatment: cutting off and processing a single-side J-shaped groove of S31254 and T91 respectively by using an external clamping type hydraulic tube cutting groove machine, wherein the groove angle of the single-side J-shaped groove is 25 degrees, the radian R is 2 mm, the single-side elongation is 2 mm, and the blunt edge thickness is 1.5 mm; groove detection within a range of 100 mm on the S31254 side is completed by adopting 100% PT penetration detection, and groove detection within a range of 100 mm on the T91 side is completed by adopting 100% UT ultrasonic detection;
s2, groove assembling and positioning: butting the single-side J-shaped groove of the S31254 with the single-side J-shaped groove of the T91, wherein the butting gap is 0.5 mm, the dislocation quantity of the inner wall and the outer wall of the groove is within 0.5 mm, and positioning by adopting four positioning blocks which are symmetrically arranged and are fixed by electric welding;
s3, protection tool and protection gas setting: respectively arranging back protection tools on the back of the welding line of S31254 and the back of the welding line of T91, and carrying out ventilation protection; the back protection tool consists of a rigid telescopic rod and two flexible rubber cover plates; the welding gun shielding gas is 96 volume percent of argon gas, 2 volume percent of nitrogen gas and 2 volume percent of helium gas, and the back surface shielding gas is 95 volume percent of argon gas and 5 volume percent of nitrogen gas;
s4, welding: before welding, respectively polishing the inner and outer burrs of the groove at the S31254 side and the groove at the T91 side by a right-angle grinding machine; the method comprises the following steps of finishing the setting of 45 out-of-interval parameters such as 'arc striking mode', 'current mode', 'pre-gas feeding time' and the like, and 15 in-interval parameters such as 'interval number' and 'current magnitude', 'wire feeding speed', 'yaw parameter' and the like in each interval on a programming interface of a welding machine; preheating one side of T91 at 250 ℃;
during welding, AWSA 5.14: ERNiCrMo-10, welding wire with diameter of phi 1.0 mm; the method comprises the following steps that a pipeline all-position TIG digital automatic pipe welding machine and a matched rigid snap ring TIG welding gun are used, and the polarity of a welding power supply is set to be direct-current pulse positive connection;
in the horizontal butt joint position of S31254 and T91, adopting full-position pulse automatic argon tungsten-arc welding to implement priming, filling and covering of dissimilar steel;
wherein, the welding process parameters of the backing welding are divided into five intervals, and the arcing position is in the direction of 10-11 points;
interval 1: peak current IPeak(s)99A, base current IBase of48; the arc voltage U is 11V, the wire feeding speed is 410 mm/min, and the welding gun walking speed is 80 mm/min;
interval 2: peak current IPeak(s)99A, base current IBase of50; the arc voltage U is 11V, the wire feeding speed is 410 mm/min, and the welding gun walking speed is 80 mm/min;
interval 3: peak current IPeak(s)99A, base current IBase of50; the arc voltage U is 11V, the wire feeding speed is 410 mm/min, and the welding gun walksThe speed is 80 mm/min;
the 4 th interval: peak current IPeak(s)99A, base current IBase of50; the arc voltage U is 11V, the wire feeding speed is 410 mm/min, and the welding gun walking speed is 80 mm/min;
interval 5: peak current IPeak(s)99A, base current IBase of50; the arc voltage U is 11V, the wire feeding speed is 410 mm/min, and the welding gun walking speed is 80 mm/min;
the welding process parameters of the filling welding and the cover surface welding are divided into four intervals, and the starting arc position is in the direction of 12-1 points;
interval 1: peak current IPeak(s)99A, base current IBase of48; the arc voltage U is 11V, the wire feeding speed is 410 mm/min, and the welding gun walking speed is 80 mm/min;
interval 2: peak current IPeak(s)99A, base current IBase of50; the arc voltage U is 11V, the wire feeding speed is 410 mm/min, and the welding gun walking speed is 80 mm/min;
interval 3: peak current IPeak(s)99A, base current IBase of50; the arc voltage U is 11V, the wire feeding speed is 410 mm/min, and the welding gun walking speed is 80 mm/min;
the 4 th interval: peak current IPeak(s)99A, base current IBase of50; the arc voltage U is 11V, the wire feeding speed is 410 mm/min, and the welding gun walking speed is 80 mm/min;
in the backing welding, the filling welding and the cover surface welding, the arc-closing position and the arc-starting position are overlapped by 5 degrees;
s5, heat treatment: adopting a step-type electromagnetic induction heat treatment mode to locally heat the welded dissimilar steel pipeline circular seam to 750 ℃, the heating and cooling speed is 200 ℃/h, and the heat preservation time is deltaEffective thickness of weldCalculating the thickness of/25 mm;
meanwhile, two groups of independent square copper tubes heated by electromagnetic induction are arranged in the same device to respectively heat S31254 and TP91, the temperature of one side of S31254 is controlled to be 420 +/-10 ℃ through an intelligent unit, the temperature of one side of TP91 is controlled to be 760 +/-10 ℃ through the intelligent unit, the heating temperature and the cooling temperature are controlled to be 50-150 ℃/h, and the heat preservation time is 15 min; and during heat treatment, when the temperature of the S31254 side reaches the set temperature of 420 ℃, starting a circulating water system to perform constant temperature control on the S31254 side, and ensuring that the temperature is below the sensitization temperature.
Test examples
The welding process and the heat treatment method of example 2 are adopted to carry out butt welding tests on the super austenitic stainless steel S31254 and TP91, and the appearance inspection, ray and ultrasonic flaw detection results of the treated welding joint are all qualified; after the tensile and bending samples are processed and polished according to the standard requirements of NB/T47016-2011 mechanical property inspection of welding test pieces of pressure-bearing equipment products, and the mechanical property of the samples is detected according to GB/T228 and GB/T2653, the test results are shown in the following table:
the above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures made by using the contents of the present specification and the drawings can be directly or indirectly applied to other related technical fields, and are within the scope of the present invention.
Claims (10)
1. A dissimilar steel welding and heat treatment method of S31254 and T91 is characterized by comprising the following steps:
s1, groove treatment: respectively carrying out cutting-off, single-edge J-shaped groove processing and groove detection within a range of 100 mm on S31254 and T91;
s2, groove assembling and positioning: butting the single-side J-shaped groove of the S31254 with the single-side J-shaped groove of the T91, and positioning by adopting a positioning block;
s3, protection tool and protection gas setting: respectively arranging back protection tools on the back of the welding line of S31254 and the back of the welding line of T91, and carrying out ventilation protection;
s4, welding: in the horizontal butt joint position of S31254 and T91, adopting full-position pulse automatic argon tungsten-arc welding to implement priming, filling and covering of dissimilar steel;
wherein, the welding process parameters of the backing welding are divided into five intervals, and the arcing position is in the direction of 10-11 points;
interval 1: peak current IPeak(s)=95-99A, base current IBase of= 45-48; the arc pressure U =10-11V, the wire feeding speed 400-410 mm/min and the welding gun walking speed =78-80 mm/min;
interval 2: peak current IPeak(s)=95-99A, base current IBase of= 45-50; the arc pressure U =10-11V, the wire feeding speed 400-410 mm/min and the welding gun walking speed =78-80 mm/min;
interval 3: peak current IPeak(s)=95-99A, base current IBase of= 45-50; the arc pressure U =10-11V, the wire feeding speed 400-410 mm/min and the welding gun walking speed =78-80 mm/min;
the 4 th interval: peak current IPeak(s)=95-99A, base current IBase of= 45-50; the arc pressure U =10-11V, the wire feeding speed 400-410 mm/min and the welding gun walking speed =78-80 mm/min;
interval 5: peak current IPeak(s)=95-99A, base current IBase of= 45-50; the arc pressure U =10-11V, the wire feeding speed 400-410 mm/min and the welding gun walking speed =78-80 mm/min;
the welding process parameters of the filling welding and the cover surface welding are divided into four intervals, and the starting arc position is in the direction of 12-1 points;
interval 1: peak current IPeak(s)=95-99A, base current IBase of= 45-48; the arc pressure U =10-11V, the wire feeding speed 400-410 mm/min and the welding gun walking speed =78-80 mm/min;
interval 2: peak current IPeak(s)=95-99A, base current IBase of= 45-50; the arc pressure U =10-11V, the wire feeding speed 400-410 mm/min and the welding gun walking speed =78-80 mm/min;
interval 3: peak current IPeak(s)=95-99A, base current IBase of= 45-50; the arc pressure U =10-11V, the wire feeding speed 400-410 mm/min and the welding gun walking speed =78-80 mm/min;
the 4 th interval: peak current IPeak(s)=95-99A, base current IBase of= 45-50; the arc pressure U =10-11V, the wire feeding speed 400-410 mm/min and the welding gun walking speed =78-80 mm/min;
s5, heat treatment: locally heating the welded dissimilar steel pipeline circular seam to 745 +/-5 ℃.
2. The method for welding and thermally treating dissimilar steels according to claim 1, wherein in S1, the groove angle of the single-sided J-shaped groove is 15 to 25 °, the radian R is 2 mm, the single-sided elongation is 2 mm, and the thickness of the blunt edge is 1.5 mm.
3. The method for welding and thermally treating dissimilar steel of S31254 and T91 according to claim 1, wherein in S1, groove inspection in the range of 100 mm on the S31254 side is completed by 100% PT penetration inspection; and finishing groove detection within a range of 100 mm on the T91 side by adopting 100% UT ultrasonic detection.
4. The method for welding and thermally treating a dissimilar steel of S31254 and T91 according to claim 1, wherein in S2, the butt joint gap is 0 to 0.5 mm, and the variation of the inner and outer walls of the groove is within 0.5 mm.
5. A method for welding and heat treating a dissimilar steel between S31254 and T91 as claimed in claim 1, wherein in S3, the welding torch shielding gas is 96% by volume of argon gas +2% by volume of nitrogen gas +2% by volume of helium gas, and the back shielding gas is 95% by volume of argon gas +5% by volume of nitrogen gas.
6. A method for welding and heat treating dissimilar steels of S31254 and T91 according to claim 1, wherein in S4, AWSA 5.14: ERNiCrMo-10, diameter of 1.0 mm.
7. A method for welding and heat treating a dissimilar steel according to S31254 and T91, according to claim 1, wherein in S4, a pipeline all-position TIG digital automatic pipe welder and a rigid snap ring TIG welding gun are used, and polarity of a welding power source is set to direct current pulse positive.
8. The method for welding and heat treating dissimilar steels S31254 and T91 according to claim 1, wherein in S4, in the backing weld, the filling weld and the facing weld, the arc striking position and the arc striking position overlap by not less than 5 °.
9. The method for welding and heat treating dissimilar steels S31254 and T91 as claimed in claim 1, wherein, in S4, the T91 side is preheated before welding at a temperature of 220 ℃ and 250 ℃.
10. A method for welding S31254 and T91 dissimilar steels according to claim 1 and performing heat treatment, wherein in S5, the temperature of the S31254 side is controlled by using a copper tube heated by electromagnetic induction during heat treatment, and when the preset constant temperature is reached, a circulating water system is started to perform constant temperature control on the S31254 side to ensure that the temperature is below the sensitization temperature.
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