CN1281370C - Double-phase staniless steel welding process - Google Patents
Double-phase staniless steel welding process Download PDFInfo
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- CN1281370C CN1281370C CN 03140209 CN03140209A CN1281370C CN 1281370 C CN1281370 C CN 1281370C CN 03140209 CN03140209 CN 03140209 CN 03140209 A CN03140209 A CN 03140209A CN 1281370 C CN1281370 C CN 1281370C
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Abstract
The present invention relates to a double-phase stainless steel welding process. The rendering welding of manual argon tungsten arc welding is carried out by adopting the inert gas protection of 99.99% of argon gas. The gas protection of 20% of carbon dioxide adding to 80% of argon gas is adopted to weld a semiautomatic filling cover surface. When a double-phase stainless steel is welded by the present invention, a metal phase structure with a relative equilibrium proportion of ferrite to austenite can be obtained, and a content of the ferrite is between 45% and 65% through measurement. The mechanical performance and the corrosion resistance of a welded joint can be fully ensured, the tensile strength of the welded joint is about 640 newtons / per square millimeter through measurement, and a hardness value of the welded joint is between 220HV10 and 280 HV10. The mixed gas of carbon dioxide and nitrogen gas is used as protective gas. Welding splash can be reduced, and a welded seam is formed into a beautiful appearance.
Description
Technical field
The invention belongs to a kind of two phase stainless steel process pipelines welding procedure.
Background technology
Two phase stainless steel is to be the alloy material of matrix with ferrite and austenite, and its intensity height, good toughness, corrosion resistance are strong, at home and abroad are widely used in offshore oil and the petrochemical industry.In its matrix, ferrite and austenite ratio are in relative equilibrium, not only has extraordinary corrosion resistance, and when welding, select correct welding procedure, its ratio does not have too big variation yet, so the intergranular corrosion resistance ability of weld seam and heat affected area is also very good, and can not produce fire check.But two phase stainless steel is as a kind of emerging steel, when practical application, requires two phase stainless steel transporting, load and unload, deposit, avoiding contacting with other ferrous metals in the processing, use as far as possible and influence its decay resistance.Require two phase stainless steel to adopt the cold working method to carry out cutting stock as far as possible, avoid thermal cutting to destroy the ratio balance of its duplex structure.During welding, require to adopt low heat input, and strict control interlayer temperature, too high to avoid weld strength, hardness is excessive as far as possible, and plasticity, toughness reduce.At present, abroad some developed countries or oil, petrochemical industry develop faster that country had all used two phase stainless steel, and the existing 10 years history that has.They mainly are used for inclement condition with two phase stainless steel, in the environment of strong corrosive medium.Domestic present petrochemical industry also have part enterprise use two phase stainless steel as the process pipelines material to improve its corrosion resistance.But use the less of carbon dioxide gas arc welding soldering diphasic stainless steel both at home and abroad at present.
Summary of the invention
The purpose of this invention is to provide a kind of two phase stainless steel process pipelines welding procedure; comprise and adopt 99.99% argon gas inert gas shielding, carry out GTAW bottoming welding and adopt 80% argon gas to add 20% and CO 2 gas-shieldedly carry out semi-automatic filling cover welding.
The present invention includes the welding of bottoming and filling capping:
(1) adopt 99.99% argon gas inert gas shielding, carry out GTAW bottoming welding and comprise following processing step:
A, the power supply of selecting for use are the TSP-300 of Panasonic type craft/argon arc welding machine, electric power polarity is straight polarity direct current, the molten bath protective gas is 99.99% argon gas, flow be the 10-18 liter/minute, back of the body protective gas is 99.99% argon gas, argon arc welding wire is Lincoln LNT4462 Φ 2.0, AWSA5.9:ER2209, tungsten electrode are thoriated tungsten electrode Φ 2.4, ANSI/AWSA5.12-92, the welding position is a horizontal fixed, wall thickness is the 8-10 millimeter, and joint form is butt joint V-type interface, and bevel angle is 60 ° ± 5 °, root face is the 0-1.5 millimeter, and the gap is the 3-5 millimeter;
B, will organize good workpiece level is fixed on the weldering frame, sealing orifice only stays air inlet/outlet, and logical argon gas is done back of the body protective gas 3-5 minute in the pipe, gas flow be the 5-10 liter/minute;
C, the accredited welder welding that feels secure, electric current is the 70-90 ampere, and voltage is the 11-13 volt, and speed of welding is the 30-50 mm/min, continues logical back of the body protective gas;
D, whole circle carry out second layer hot weld after weld, and electric current is the 105-150 ampere, and voltage is the 13-18 volt, and speed of welding is the 75-130 mm/min, the molten bath shield gas flow rate be the 10-15 liter/minute, control interlayer temperature≤150 ℃;
After e, the second layer have welded, continue logical back of the body protective gas;
(2) adopting 80% argon gas to add 20% CO 2 gas-shieldedly carries out semi-automatic filling cover welding and comprises following processing step:
A, the power supply of selecting for use are the KRII-350 of Panasonic type carbon dioxide welding machine, electric power polarity is a dc reverse connection, and the molten bath protective gas is 80% argon gas+20% carbon dioxide, and back of the body protective gas is 99.99% argon gas, flux-cored wire is Lincoln Cor-A-RostaP4462 Φ 1.2, AWSA5.22:E2209T1-4;
B, measure the weld seam temperature that the hot weld that felt secure finishes, keep interlayer temperature≤150 ℃;
C, accredited welder fill welding, electric current is the 140-180 ampere, voltage is the 23-29 volt, speed of welding is the 140-210 mm/min, the molten bath shield gas flow rate be the 15-20 liter/minute, logical argon gas is made back of the body protective gas until finishing welding or be filled to 10 millimeters thick in the pipe, control interlayer temperature≤150 ℃;
D, fill and to carry out cover welding after welding finishes, electric current is the 130-160 ampere, and voltage is the 23-27 volt, and speed of welding is the 170-230 mm/min, the molten bath shield gas flow rate be the 15-20 liter/minute, control interlayer temperature≤150 ℃.
The present invention can obtain the metallographic structure of ferrite and austenite ratio relative equilibrium when the soldering diphasic stainless steel process pipelines, ferrite content is between 45-65% after measured; The mechanical performance of welding point and corrosion resistance can fully be guaranteed, and its tensile strength is about 640 newton/square millimeters after measured, and hardness number is between 220-280HV10.Use carbon dioxide+argon gas mist to do protective gas, can reduce spatter, appearance of weld is attractive in appearance.
The specific embodiment
Is example with wall thickness at 9 millimeters interface tube; adopt 99.99% argon gas inert gas shielding; carry out GTAW bottoming welding; the power supply of selecting for use earlier is the TSP-300 of a Panasonic type craft/argon arc welding machine, and electric power polarity is straight polarity direct current, and the molten bath protective gas is 99.99% argon gas; flow is 14 liters/minute; back of the body protective gas is 99.99% argon gas, and argon arc welding wire is Lincoln LNT4462 Φ 2.0, AWSA5.9:ER2209; tungsten electrode is thoriated tungsten electrode Φ 2.4; ANSI/AWSA5.12-92, the welding position is a horizontal fixed, wall thickness is 9 millimeters; joint form is butt joint V-type interface; bevel angle is 60 °, and root face is 1 millimeter, and the gap is 4 millimeters.Group is fixed on the weldering frame good workpiece level, and sealing orifice only stays air inlet/outlet, and logical argon gas is done protection gas 4 minutes in the pipe, and gas flow is 8 liters/minute; The accredited welder welding that feels secure, electric current is 80 amperes, and voltage is 12 volts, and speed of welding is 40 mm/min, continues logical back of the body protective gas; Carry out second layer hot weld after whole circle weld, electric current is 125 amperes, and voltage is 15 volts, and speed of welding is 250 mm/min, and the molten bath shield gas flow rate is 13 liters/minute, controls interlayer temperature≤150 ℃; Adopt 80% argon gas to add 20% again and CO 2 gas-shieldedly carry out semi-automatic filling cover welding.The power supply of selecting for use is the KRII-350 of a Panasonic type carbon dioxide welding machine, electric power polarity is a dc reverse connection, and the molten bath protective gas is 80% argon gas+20% carbon dioxide, and back of the body protective gas is 99.99% argon gas, flux-cored wire is Lincoln Cor-A-RostaP4462 Φ 1.2, AWSA5.22:E2209T1-4; Measure the weld seam temperature that the hot weld that felt secure finishes, keep interlayer temperature≤150 ℃; Accredited welder fills welding, and electric current is 160 amperes, and voltage is 26 volts, speed of welding is 175 mm/min, the molten bath shield gas flow rate is 13 liters/minute, and logical argon gas is made back of the body protective gas until finishing welding or be filled to 10 millimeters thick in the pipe, control interlayer temperature≤150 ℃; Fill and to carry out cover welding after welding finishes, electric current is 145 amperes, and voltage is 25 volts, and speed of welding is 200 mm/min, and the molten bath shield gas flow rate is 18 liters/minute, control interlayer temperature≤150 ℃.After the second layer has welded, continue logical back of the body protective gas.Wall thickness is suitably adjusted as the welding condition that changes then.As: when pipe thickness is the 18-22 millimeter, fill electric current 140-180 ampere, voltage 23-28 volt, speed of welding 180-240 mm/min, the cover welding technological parameter is the same.The polishing of interlayer cleaning available dedicated stainless steel grinding wheel.If conditions permit uses a certain proportion of argon gas+nitrogen mixture body to do back-protective during argon arc welding, can reduce the weld seam ferrite content, improve the weld seam corrosion resistance.The present invention can obtain the metallographic structure of ferrite and austenite ratio relative equilibrium when soldering diphasic stainless steel, ferrite content is between 45-65% after measured; The mechanical performance of welding point and corrosion resistance can fully be guaranteed, and its tensile strength is about 640 newton/square millimeters after measured, and hardness number is between 220-280HV10.Use carbon dioxide+nitrogen mixture body to do protective gas, can reduce spatter, appearance of weld is attractive in appearance.
Claims (3)
1, a kind of two phase stainless steel process pipelines welding procedure comprises the welding of bottoming and filling capping, it is characterized in that
(1) adopt 99.99% argon gas inert gas shielding, carry out GTAW bottoming welding and comprise following processing step:
A, the power supply of selecting for use are the TSP-300 of Panasonic type craft/argon arc welding machine, electric power polarity is straight polarity direct current, the molten bath protective gas is 99.99% argon gas, flow be the 10-18 liter/minute, back of the body protective gas is 99.99% argon gas, argon arc welding wire is Lincoln LNT4462 Φ 2.0, AWSA5.9:ER2209, tungsten electrode are thoriated tungsten electrode Φ 2.4, ANSI/AWSA5.12-92, the welding position is a horizontal fixed, wall thickness is the 8-10 millimeter, and joint form is butt joint V-type interface, and bevel angle is 60 ° ± 5 °, root face is the 0-1.5 millimeter, and the gap is the 3-5 millimeter;
B, will organize good workpiece level is fixed on the weldering frame, sealing orifice only stays air inlet/outlet, and logical argon gas is done back of the body protective gas 3-5 minute in the pipe, gas flow be the 5-10 liter/minute;
C, the accredited welder welding that feels secure, electric current is the 70-90 ampere, and voltage is the 11-13 volt, and speed of welding is the 30-50 mm/min, continues logical back of the body protective gas;
D, whole circle carry out second layer hot weld after weld, and electric current is the 105-150 ampere, and voltage is the 13-18 volt, and speed of welding is the 75-130 mm/min, the molten bath shield gas flow rate be the 10-15 liter/minute, control interlayer temperature≤150 ℃;
After e, the second layer have welded, continue logical back of the body protective gas;
(2) adopting 80% argon gas to add 20% CO 2 gas-shieldedly carries out semi-automatic filling cover welding and comprises following processing step:
A, the power supply of selecting for use are the KRII-350 of Panasonic type carbon dioxide welding machine, electric power polarity is a dc reverse connection, and the molten bath protective gas is 80% argon gas+20% carbon dioxide, and back of the body protective gas is 99.99% argon gas, flux-cored wire is Lincoln Cor-A-RostaP4462 Φ 1.2, AWSA5.22:E2209T1-4;
B, measure the weld seam temperature that the hot weld that felt secure finishes, keep interlayer temperature≤150 ℃;
C, accredited welder fill welding, electric current is the 140-180 ampere, voltage is the 23-29 volt, speed of welding is the 140-210 mm/min, the molten bath shield gas flow rate be the 15-20 liter/minute, logical argon gas is made back of the body protective gas until finishing welding or be filled to 10 millimeters thick in the pipe, control interlayer temperature≤150 ℃; D. fill and carry out cover welding after welding finishes, electric current is the 130-160 ampere, and voltage is the 23-27 volt, and speed of welding is the 170-230 mm/min, the molten bath shield gas flow rate be the 15-20 liter/minute, control interlayer temperature≤150 ℃.
2,, can use argon gas+nitrogen mixture body to do back-protective when it is characterized in that argon arc welding according to the described two phase stainless steel process pipelines of claim 1 welding procedure.
3,, when it is characterized in that pipe thickness is the 18-22 millimeter, fill electric current 140-180 ampere, voltage 23-28 volt, speed of welding 180-240 mm/min according to the described two phase stainless steel process pipelines of claim 1 welding procedure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 03140209 CN1281370C (en) | 2003-08-18 | 2003-08-18 | Double-phase staniless steel welding process |
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| CN 03140209 CN1281370C (en) | 2003-08-18 | 2003-08-18 | Double-phase staniless steel welding process |
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| CN1281370C true CN1281370C (en) | 2006-10-25 |
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Cited By (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101633073B (en) * | 2009-08-21 | 2011-03-30 | 长沙金阳机械设备科技开发有限公司 | Process for welding automobile crane subsidiary arm connecting support seat |
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| CN1583347A (en) | 2005-02-23 |
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