CN113523506A - Novel martensite heat-resistant steel G115 pipeline welding method - Google Patents
Novel martensite heat-resistant steel G115 pipeline welding method Download PDFInfo
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- CN113523506A CN113523506A CN202111077877.7A CN202111077877A CN113523506A CN 113523506 A CN113523506 A CN 113523506A CN 202111077877 A CN202111077877 A CN 202111077877A CN 113523506 A CN113523506 A CN 113523506A
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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
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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
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
- B23K9/0052—Welding of pipe panels
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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
- B23K9/235—Preliminary treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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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 provides a novel welding method for a martensite heat-resistant steel G115 pipeline, which relates to the technical field of welding, and comprises the following steps: preparing grooves at the end parts of two G115 pipelines to be welded; an argon gas chamber is manufactured in the pipeline in a partition board or water-soluble paper mode, and a gas inlet and a gas outlet are reserved; preheating a G115 pipeline groove and a nearby parent metal; when the temperature of the root of the groove reaches 150 ℃, preserving the heat for 30min, and then performing backing welding by adopting TIG (tungsten inert gas) welding, and realizing single-side welding and double-side forming; after filling welding is carried out by adopting semi-automatic TIP TIG, facing welding is carried out by adopting semi-automatic TIP TIG; and (4) carrying out high-temperature tempering heat treatment after welding. The novel welding method for the martensite heat-resistant steel G115 pipeline provided by the invention adopts a TIG and TIP TIG combined welding method, ensures that the welding quality meets the requirement of service performance, improves the welding production efficiency, reduces the use of welding materials, can reduce the labor intensity of a welder, reduces the adverse effect of human factors, and saves the welding cost.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a novel method for welding a martensite heat-resistant steel G115 pipeline.
Background
The strategic guidance of energy development and reformation in China is clear, and the clean and efficient utilization of coal is greatly promoted. The 630 ℃ ultra-supercritical coal-fired power generating unit is the most advanced power generating technology in the world at present and is the key development direction in the future, and the novel martensite heat-resistant steel G115 is a key material for the design and construction of the novel martensite heat-resistant steel.
Welding is used as a permanent connection process method of metal materials, and the safe operation of the generator set is directly influenced by the high and low welding quality of G115. The G115 steel belongs to 9Cr-3W-3Co series martensite heat-resistant steel, has high alloy content and poor weldability, and a welded joint is easy to generate cold and hot cracks. At present, the impact toughness of the deposited metal of the matched welding rod developed by a welding material manufacturer is seriously degraded, and the research on the welding process of a construction site is hindered. The full-position high-quality and high-efficiency welding process for the field installation of the G115 steel pipeline becomes a research hotspot of the power industry.
Disclosure of Invention
The invention aims to provide a novel welding method for a martensite heat-resistant steel G115 pipeline, which adopts a TIG and TIP TIG combined welding method to ensure that the welding quality meets the requirement of service performance, improve the welding production efficiency and save the welding cost.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a novel martensite heat-resistant steel G115 pipeline welding method, which comprises the following steps:
preparing grooves at the end parts of two G115 pipelines to be welded;
an argon gas chamber is manufactured in the pipeline in a partition board or water-soluble paper mode, and a gas inlet and a gas outlet are reserved;
preheating a G115 pipeline groove and a nearby parent metal;
when the temperature of the root of the groove reaches 150 ℃, preserving the heat for 30min, and then performing backing welding by adopting TIG (tungsten inert gas) welding, and realizing single-side welding and double-side forming;
after filling welding is carried out by adopting semi-automatic TIP TIG, facing welding is carried out by adopting semi-automatic TIP TIG;
and (4) carrying out high-temperature tempering heat treatment after welding.
And further, after the groove is prepared, polishing and cleaning the groove and two sides of the inner wall of the pipeline, and assembling the two pipelines to be welded.
Further, when the wall thickness of the pipeline is more than or equal to 10mm and less than or equal to 30mm, the groove comprises a first slope section, a first arc section and a first axial extension section which are sequentially connected;
when the wall thickness of the pipeline is more than 30mm and less than or equal to 150mm, the groove comprises a second slope section, a second circular arc section, a third slope section, a third circular arc section, a fourth slope section and a second axial extension section which are sequentially connected, and included angles between the second slope section, the third slope section and the fourth slope section and the G115 pipeline in the axial direction are gradually reduced.
Further, before the argon gas chamber is manufactured, the method further comprises the following steps:
selecting a G115 argon arc welding wire matched with G115 steel as a filling metal material;
when TIG is adopted, the specification of the welding wire is phi 2.4 mm;
the specification of the welding wire is phi 1.0mm when semi-automatic TIP TIG is adopted.
Further, when the argon gas chamber is manufactured, the method specifically comprises the following steps:
the flow rate of pure argon filled into the argon chamber is 8-30L/min; and when the thickness of the welding line reaches at least 5mm, argon filling can be stopped, the oxygen concentration of the argon chamber is measured in real time, and root welding can be carried out when the oxygen concentration of the back shielding gas is lower than 0.1%.
Further, during the preheating of the groove of the G115 pipe and the nearby base metal:
the temperature of the heating zone is controlled at 200 ℃ and 270 ℃, and the width of the heating zone at each side of the groove is not less than 100 mm.
Further, when TIG is adopted for backing welding, the welding current is 80-140A, the polarity of the welding current is direct current positive connection, the arc voltage is 8-15V, the welding speed is 25-50mm/min, the interlayer temperature is controlled at 300 ℃ at 150 ℃, the protective gas is argon, the flow is 8-12L/min, and the control range of the welding bead thickness is 0.5-3 mm.
Further, when filling welding is carried out by adopting semi-automatic TIP TIG, the welding current is 150-210A, the welding current polarity is direct current positive connection, the hot wire current is 0-80A, the arc voltage is 8-15V, the welding speed is 30-90mm/min, the wire feed speed = V multiplied by 0.074m/min, V is 18-28, the amplitude of the welding wire is 200-260HZ, the interlayer temperature is controlled at 150-300 ℃, the protective gas is argon, the flow is 15-20L/min, and the welding bead thickness control range is 1-3 mm.
Further, when the semi-automatic TIP TIG is adopted for facing welding, the welding current is 150-200A, the welding current polarity is direct current positive connection, the hot wire current is 0-80A, the arc voltage is 8-15V, the welding speed is 20-60mm/min, the wire feeding speed = V multiplied by 0.074m/min, V is 10-25, the amplitude of the welding wire is 200-260HZ, the interlayer temperature is controlled at 150-300 ℃, the protective gas is argon, the flow is 15-20L/min, and the welding bead thickness control range is 0.5-2.5 mm.
Further, after the welding is finished, the temperature of the welding joint is reduced to 80-150 ℃, the temperature is kept for 1-2 h, and then the heat treatment step is carried out, wherein the constant temperature of the post-welding heat treatment is 765-775 ℃.
The novel welding method for the martensite heat-resistant steel G115 pipeline provided by the invention has the following beneficial effects that:
compared with the prior art, the novel martensite heat-resistant steel G115 pipeline welding method provided by the invention adopts a TIG and TIP TIG combined welding method, so that the welding quality is ensured to meet the requirement of service performance, the welding production efficiency is improved, the use of welding materials is reduced, the labor intensity of a welder is reduced, the adverse effect of human factors is reduced, and the welding cost is saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a novel martensitic heat-resistant steel G115 pipeline welding method provided by an embodiment of the invention;
fig. 2 is a schematic structural diagram of a groove provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another groove provided in the embodiment of the present invention.
Icon: 1-a first ramp segment; 2-a first arc segment; 3-a first axial extension; 4-a second ramp segment; 5-a second arc segment; 6-a third slope section; 7-a third arc segment; 8-a fourth ramp segment; 9-second axial extension.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
An embodiment of the first aspect of the present invention is to provide a novel method for welding a martensitic heat-resistant steel G115 pipeline, as shown in fig. 1, including:
step S101: preparing grooves at the end parts of two G115 pipelines to be welded;
step S102: an argon gas chamber is manufactured in the pipeline in a partition board or water-soluble paper mode, and a gas inlet and a gas outlet are reserved;
step S103: preheating a G115 pipeline groove and a nearby parent metal;
step S104: when the temperature of the root of the groove reaches 150 ℃, preserving the heat for 30min, and then performing backing welding by adopting TIG (tungsten inert gas) welding, and realizing single-side welding and double-side forming;
step S105: after filling welding is carried out by adopting semi-automatic TIP TIG, facing welding is carried out by adopting semi-automatic TIP TIG;
step S106: and (4) carrying out high-temperature tempering heat treatment after welding.
Among them, tig (tungsten Inert Gas welding), also known as non-metal Inert Gas arc welding, has the advantages of better Gas tightness, less weld pores, etc.; TIP TIG welding technology is a unique hot wire TIG welding technology with dynamic vibration automatic wire feeding, TIP TIG has the function of hot wire, welding speed is improved by improving deposition rate, and TIP TIG adopts an automatic high-frequency vibration wire feeding mechanism to give high-frequency linear vibration to the fed welding wire.
The TIG and TIP TIG welding technology is adopted, so that the welding quality is ensured to meet the requirement of service performance, the welding production efficiency can be improved, the use of welding materials is reduced, and the labor intensity of a welder is reduced.
Before preparing the groove at the end part of two G115 pipelines needing to be welded, preparation work is needed, namely preparing the novel martensite heat-resistant steel G115 pipeline which is supplied in a normalized state and a tempered state, wherein the wall thickness range of the G115 pipeline is 10-150 mm.
In some embodiments, in order to further ensure the welding quality, after the groove is prepared, the groove and two sides of the inner wall of the pipeline are polished and cleaned, and two pipelines to be welded are assembled in an assembly manner.
Specifically, when the wall thickness of the pipeline is not less than 10mm and not more than 30mm, as shown in fig. 2, the welding ends of the two G115 pipelines are oppositely arranged, and the groove comprises a first slope section 1, a first arc section 2 and a first axial extension section 3 which are sequentially connected along the direction facing to fig. 2.
As shown in fig. 2, the angle θ between the first slope section 1 and the vertical direction1Is 7-9 degrees; radius R of the first circular arc segment 21Is 2 mm; the axial length L of the first axial extension 3 along the G115 pipe12-3 mm; bevel blunt edge H of G115 pipeline1Is 1-2 mm; two G115 pipeline pairing gaps L2Is 2-3.5 mm.
When the wall thickness of the pipeline is more than 30mm and less than or equal to 150mm, as shown in fig. 3, the welding ends of the two G115 pipelines are oppositely arranged, the groove comprises a second slope section 4, a second circular arc section 5, a third slope section 6, a third circular arc section 7, a fourth slope section 8 and a second axial extension section 9 which are sequentially connected along the direction facing to fig. 3, and the included angles between the second slope section 4, the third slope section 6 and the fourth slope section 8 and the axial direction of the pipeline are gradually reduced.
As shown in fig. 2, the angle θ between the second slope section 4 and the vertical direction2Is 3-7 degrees; second oneRadius R of the circular arc segment 52Is 3 mm; the angle theta between the third slope section 6 and the vertical direction3Is 6-10 degrees, and the distance H between the top end of the third slope section 6 and the bottom end of the G115 pipeline2Is 75 mm; radius R of third arc segment 73Is 3 mm; the angle theta between the fourth slope section 8 and the vertical direction4Is 40-50 degrees, and the distance H between the top end of the fourth slope section 8 and the bottom end of the G115 pipeline3Is 9-15 mm; the axial length L of the second axial extension 9 along the G115 duct2Is 1 mm; bevel blunt edge H of G115 pipeline4Is 1-2 mm; beveling L of two G115 pipelines3Is 2-4 mm.
It should be noted that the outer diameter of the G115 pipe is required to be larger than 75 mm.
In some embodiments, prior to fabricating the argon gas chamber, further comprising: selecting a G115 argon arc welding wire matched with G115 steel as a filling metal material; when TIG is adopted, the specification of the welding wire is phi 2.4 mm; the specification of the welding wire is phi 1.0mm when semi-automatic TIP TIG is adopted.
In some embodiments, when the argon gas chamber is manufactured, the method specifically comprises the following steps: the flow rate of pure argon filled into the argon chamber is 8-30L/min; when the thickness of the welding line reaches at least 5mm, argon filling can be stopped, meanwhile, the oxygen concentration of the argon chamber is measured in real time, and root welding can be carried out when the oxygen concentration of the back shielding gas is lower than 0.1% so as to ensure the welding quality.
Wherein the purity of the pure argon is more than or equal to 99.99 percent; the pure argon flow may be 8L/min, 15L/min, 20L/min or 30L/min.
In addition, the oxygen concentration of the argon gas chamber can be measured by using an oxygen meter in the above step.
In some embodiments, in preheating the groove of the G115 pipe and the adjacent parent metal: the temperature of the heating zone is controlled at 200 ℃ and 270 ℃, and the width of the heating zone at each side of the groove is not less than 100 mm.
Specifically, the heating zone temperature may be 200 ℃, 220 ℃, 250 ℃ or 270 ℃; the width of the heating zone on each side of the groove may be 100mm, 110mm or 120 mm.
In at least one embodiment, the G115 pipe groove and the adjacent parent metal are preheated by adopting an electric heating mode or flame heating. The electric heating mode can be flexible ceramic resistance heating, far infrared radiation heating, induction heating and the like.
In some embodiments, when TIG is adopted for backing welding, in order to ensure the backing welding quality, the welding current is 80-140A, the polarity of the welding current is direct current positive connection, the arc voltage is 8-15V, the welding speed is 25-50mm/min, the interlayer temperature is controlled at 300 ℃ plus 150 ℃, the protective gas is argon, the flow is 8-12L/min, and the control range of the welding bead thickness is 0.5-3 mm.
Specifically, the welding current may be 80A, 100A, 120A, or 140A; the arc voltage may be 8V, 10V, 12V or 15V; the welding speed can be 25 mm/min, 35 mm/min, 45 mm/min or 50 mm/min; the interlayer temperature is controlled at 150 ℃, 200 ℃, 250 ℃ or 300 ℃; the argon flow can be 8L/min, 9L/min, 10L/min or 12L/min; the bead thickness control range may be 0.5mm, 1mm, 2mm, 3 mm.
In some embodiments, when filling welding is performed by using semi-automatic TIP TIG, in order to ensure the filling welding efficiency, the welding current is 150-.
Specifically, the welding current may be 150A, 170A, 200A, or 210A; the hot wire current may be 0A, 40A, 60A, or 80A; the arc voltage may be 8V, 10V, 12V or 15V; the welding speed can be 30 mm/min, 50mm/min, 70 mm/min or 90 mm/min; v may be 18, 22, 24 or 28; the wire amplitude may be 200 HZ, 210 HZ, 230 HZ, or 260 HZ; the interlayer temperature is controlled at 150 ℃, 200 ℃, 250 ℃ or 300 ℃; the argon flow can be 15L/min, 16L/min, 18L/min or 20L/min; the bead thickness control range may be 1mm, 1.5mm, 2mm or 3 mm.
In some embodiments, when semi-automatic TIP TIG is adopted for facing welding, in order to ensure the facing welding efficiency, the welding current is 150-200A, the polarity of the welding current is direct current positive connection, the current of a hot wire is 0-80A, the arc voltage is 8-15V, the welding speed is 20-60mm/min, the wire feeding speed = V multiplied by 0.074m/min, V is 10-25, the amplitude of a welding wire is 200-260HZ, the interlayer temperature is controlled at 150-300 ℃, the protective gas is argon, the flow is 15-20L/min, and the control range of the thickness of a welding bead is 0.5-2.5 mm.
Specifically, the welding current may be 150A, 170A, 180A, or 200A; the hot wire current may be 0A, 40A, 60A, or 80A; the arc voltage may be 8V, 10V, 12V or 15V; the welding speed can be 20 mm/min, 35 mm/min, 40 mm/min or 60 mm/min; v may be 10, 15, 20 or 25; the wire amplitude may be 200 HZ, 210 HZ, 230 HZ, or 260 HZ; the interlayer temperature is controlled at 150 ℃, 200 ℃, 250 ℃ or 300 ℃; the argon flow can be 15L/min, 16L/min, 18L/min or 20L/min; the bead thickness control range may be 0.5mm, 1mm, 2mm, 2.5 mm.
In some embodiments, as shown in fig. 1, step S106 specifically includes: after welding, the temperature of the welded joint is reduced to 80-150 ℃, heat preservation is carried out for 1-2 h, and then the heat treatment step is carried out, wherein the constant temperature of the heat treatment after welding is 765-775 ℃.
Specifically, the temperature of the welding joint can be reduced to 80 ℃, 100 ℃, 120 ℃ or 150 ℃ after the welding is finished; the heat preservation time is 1h, 1.2h, 1.5h or 2 h.
The constant temperature time is related to the wall thickness of the G115 pipeline, and when the post-welding heat treatment is performed by adopting a flexible ceramic resistance heating or far infrared radiation heating mode, as shown in table 1, the table 1 is a relation table of the wall thickness and the constant temperature time. When the postweld heat treatment is carried out by adopting an induction heating mode, the constant temperature time is calculated according to 2min/mm-3.5min/mm, and is at least 60 min.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A novel martensite heat-resistant steel G115 pipeline welding method is characterized by comprising the following steps:
preparing grooves at the end parts of two G115 pipelines to be welded;
selecting a G115 argon arc welding wire matched with G115 steel as a filling metal material;
when TIG is adopted, the specification of the welding wire is phi 2.4 mm;
the specification of the welding wire is phi 1.0mm when semi-automatic TIP TIG is adopted;
an argon gas chamber is manufactured in the pipeline in a partition board or water-soluble paper mode, and a gas inlet and a gas outlet are reserved;
preheating a G115 pipeline groove and a nearby parent metal;
when the temperature of the root of the groove reaches 150 ℃, preserving the heat for 30min, and then performing backing welding by adopting TIG (tungsten inert gas) welding, and realizing single-side welding and double-side forming;
after filling welding is carried out by adopting semi-automatic TIP TIG, facing welding is carried out by adopting semi-automatic TIP TIG;
and (4) carrying out high-temperature tempering heat treatment after welding.
2. The novel welding method for the martensitic heat-resistant steel G115 pipeline as claimed in claim 1, wherein after the groove is prepared, the groove and two sides of the inner wall of the pipeline are polished and cleaned, and two pipelines to be welded are assembled in a pairing mode.
3. The novel welding method for martensitic heat-resistant steel G115 pipes as claimed in claim 1,
when the wall thickness of the pipeline is more than or equal to 10mm and less than or equal to 30mm, the groove comprises a first slope section (1), a first arc section (2) and a first axial extension section (3) which are sequentially connected;
when the wall thickness of the pipeline is more than 30mm and less than or equal to 150mm, the groove comprises a second slope section (4), a second arc section (5), a third slope section (6), a third arc section (7), a fourth slope section (8) and a second axial extension section (9) which are sequentially connected, and included angles between the second slope section (4), the third slope section (6) and the fourth slope section (8) and the G115 pipeline in the axial direction are gradually reduced.
4. The novel welding method for the martensitic heat-resistant steel G115 pipeline as claimed in claim 1 is characterized by comprising the following specific steps when the argon chamber is manufactured:
the flow rate of pure argon filled into the argon chamber is 8-30L/min; and when the thickness of the welding line reaches at least 5mm, argon filling can be stopped, the oxygen concentration of the argon chamber is measured in real time, and root welding can be carried out when the oxygen concentration of the back shielding gas is lower than 0.1%.
5. The method for welding a novel martensitic heat-resistant steel G115 pipe according to claim 1, wherein, during the preheating of the groove of the G115 pipe and the nearby base metal:
the temperature of the heating zone is controlled at 200 ℃ and 270 ℃, and the width of the heating zone at each side of the groove is not less than 100 mm.
6. The novel welding method for the martensitic heat-resistant steel G115 pipeline as claimed in claim 1, wherein when the TIG is adopted for backing welding, the welding current is 80-140A, the polarity of the welding current is direct current positive connection, the arc voltage is 8-15V, the welding speed is 25-50mm/min, the interlayer temperature is controlled at 150-300 ℃, the protective gas is argon, the flow is 8-12L/min, and the control range of the weld bead thickness is 0.5-3 mm.
7. The novel pipeline welding method for martensite refractory steel G115 as claimed in claim 1, wherein when filling welding is performed by semi-automatic TIP TIG, the welding current is 150-210A, the polarity of the welding current is direct current positive connection, the current of the hot wire is 0-80A, the arc voltage is 8-15V, the welding speed is 30-90mm/min, the wire feeding speed = V x 0.074m/min, V is 18-28, the amplitude of the welding wire is 200-260HZ, the interlayer temperature is controlled at 150-300 ℃, the protective gas is argon, the flow rate is 15-20L/min, and the control range of the thickness of the welding bead is 1-3 mm.
8. The novel pipeline welding method for martensitic heat-resistant steel G115 as claimed in claim 1, wherein when semi-automatic TIP TIG is adopted for facing welding, the welding current is 150-200A, the polarity of the welding current is direct current positive connection, the current of a hot wire is 0-80A, the arc voltage is 8-15V, the welding speed is 20-60mm/min, the wire feeding speed = V x 0.074m/min, V is 10-25, the amplitude of the welding wire is 200-260HZ, the interlayer temperature is controlled at 300 ℃ under 150-one conditions, the protective gas is argon, the flow is 15-20L/min, and the control range of the thickness of a welding bead is 0.5-2.5 mm.
9. The novel welding method for the martensitic heat-resistant steel G115 pipeline as claimed in claim 1, wherein the temperature of the welded joint is reduced to 80-150 ℃ after the welding is finished, the temperature is kept for 1-2 h, and then the heat treatment step is carried out, wherein the constant temperature of the post-welding heat treatment is 765-775 ℃.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002011575A (en) * | 2000-06-30 | 2002-01-15 | Kawasaki Steel Corp | Welding method for steel pipe |
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| CN111992855A (en) * | 2020-09-02 | 2020-11-27 | 中国电建集团山东电力建设第一工程有限公司 | Welding and combined heat treatment method for martensite heat-resistant steel G115 large-diameter thick-wall pipeline |
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2021
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| JP2002011575A (en) * | 2000-06-30 | 2002-01-15 | Kawasaki Steel Corp | Welding method for steel pipe |
| CN101417364A (en) * | 2008-11-20 | 2009-04-29 | 新疆石油工程建设有限责任公司 | Semi-automatic welding method of metal flux cored filler rod conduit root |
| CN102528244A (en) * | 2012-02-14 | 2012-07-04 | 中国海洋石油总公司 | Semiautomatic argon tungsten-arc welding technological process of bimetal compounding sea pipe |
| JP2014159034A (en) * | 2013-02-19 | 2014-09-04 | Nippon Steel & Sumikin Pipeline & Engineering Co Ltd | Mag welding device |
| CN103586566A (en) * | 2013-10-23 | 2014-02-19 | 中国石油天然气集团公司 | Semi-automatic argon-arc welding method for bimetal composite pipes |
| CN105583499A (en) * | 2014-10-21 | 2016-05-18 | 廊坊市管道人机械设备有限公司 | Full-automatic welding method for metal powder-cored wire pipeline girth welding joints |
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| CN110814560A (en) * | 2019-10-12 | 2020-02-21 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Large-caliber G115 pipeline on-site welding method |
| CN111992855A (en) * | 2020-09-02 | 2020-11-27 | 中国电建集团山东电力建设第一工程有限公司 | Welding and combined heat treatment method for martensite heat-resistant steel G115 large-diameter thick-wall pipeline |
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