CN102785013A - Method for gas-shielded butt welding of 80mm thick high-strength bridge steel - Google Patents
Method for gas-shielded butt welding of 80mm thick high-strength bridge steel Download PDFInfo
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Abstract
The invention relates to a method for gas-shielded butt welding of 80mm thick high-strength bridge steel, which comprises the steps of butt welding of 80mm thick bridge steel with Rm no less than 570MPa, ReL no less than 420MPa, elongation A no less than 18 percent, KV2 at minus 40DEG C no less than 120J and the same thickness, wherein the tensile strength of a matching welding wire is no less than 600MPa, and the diameter phi of the welding wire is 1.2mm; a double-sided V-type symmetric groove is adopted as a gas-shielded welding groove, the angle of the groove is 60 degrees, and a blunt edge is 2mm; and continuously welding with the current of 262-270A, the voltage of 26-28V, the speed of 28-29cm/min, the linear energy of 14-16KJ/cm and rich argon as a protective gas, wherein the interlayer temperature is controlled as 100-110 DEG C. The thickness reaches 80mm and no preheating is performed prior to welding of a butt joint, no heat treatment is performed after welding, but flaw detection results show that no crack can be produced. Moreover, the impact power of three zones of the joint KV2 at minus 40DEG C can reach 145-260J, and technical requirements for manufacturing of large-span bridge structures can be satisfied completely.
Description
Technical field
The present invention relates to a kind of 80 millimeters thick high-strength bridge steel gas and protect the butt joint welding technique, be applicable to welding tensile strength R
m>=570MPa grade high-strength degree science of bridge building thick plate structure is used steel, and it belongs to the Longspan Bridge slab and makes welding technology field.
Background technology
Since the global design of bridge Welding Structure progressively to high-strength, stride greatly, heavy duty, high speed aspect development; This has just proposed increasingly high requirement to Welding Structure with the performance of steel;, the iron dual-purpose Yangtze Bridge both that the large span of building is public like China, its designing requirement tensile strength is on the basis of 600 ~ 700MPa, and the thickness requirement of base material is at 80 millimeters; At the maximum ga(u)ge that uses first aspect the bridge construction steel construction, and the security performance of bridge manufacturing proposed to be strict with very much.This is not only to base material, and weldability, welding material and the welding procedure of steel grade proposed higher matching.Therefore, like untimely weldability and supporting welding material and the welding procedure problem that solves Longspan Bridge steel grade slab effectively, will directly hinder applying of Bridges in Our Country steel and new steel grade.Accelerate to carry out coupling and the Study of Welding Technology of Longspan Bridge, Bridges in Our Country is applied great economic benefit and social benefit with steel in Longspan Bridge thick plate structure manufacturing technology with the steel welding material.
At present, Chinese patent number is " a kind of high-strength bridge steel heavy plate K type joint gas that is used for is protected welding method " patent documentation of 200910062156.1, and it discloses a kind of employing tensile strength R
M:570 ~ 650MPa, yield strength R
EL:420 ~ 490MPa, percentage elongation: A18 ~ 24%, ballistic work-40
oC KV
2: the bridge steel of 120 ~ 270J, thickness are 36 ~ 50 mm; The welding wire tensile strength of coupling is greater than 600 MPa, gage of wire Ф 1.2mm; Gas is protected the weldering groove and is adopted two-sided K type symmetry groove, and bevel angle is 50 ° ~ 55 °, and root face is 2mm; In welding current 260 ~ 250A, weldingvoltage 23 ~ 22V, speed of welding 29 ~ 20cm/min, weld heat input 12 ~ 17kJ/cm, employing percent by volume is 20%CO
2The rich argon that adds 80%Ar is made protection gas and its flow-control continuous sequence under the condition of 18 ~ 20L/min; So that till weld seam fills up; Interlayer temperature is controlled at 100 ~ 150 ℃ gas and protects welding method, and not preheating before the weldering, the postwelding welding procedure of not heat-treating.But the deficiency of its existence is the maximum ga(u)ge of this patented technology welding is 50 millimeters steel plate.
For the bridge of big shaped steel box-beam structure, the key issue of its solution is to guarantee under the prerequisite that safety is on active service, and, flawless indeformable through welding back structure produces, and joint has good mechanical property and low-temperature flexibility.Yet it is well-known; Along with the intensity of bridge construction base material and the increase of thickness; Especially be 50 millimeters from present throat thickness and be increased to 80 millimeters; Under the not heat treated situation of not preheating before weldering, postwelding, guarantee the medium-and-large-sized steel construction anticracking of welding process, prevent being broken into primary key technology into manufacture process.And the large-scale steel structure manufacture process is carried out weld preheating, and post weld heat treatment means the difficulty of construction environment, manufacturing cost and manufacturing cycle, can't satisfy the specification requirement of construction.Crucial welding procedure manufacturing technology is welded in the gas shiled that the invention discloses a kind of 80 millimeters thick high-strength bridge steel plates, and its problem that mainly solves is to have proposed the welding technique that not preheating before the weldering of a kind of rich argon shield welding procedure and matching materials welding large span high-strength bridge steel slab banjo fixing butt jointing, postwelding are not heat-treated.
Summary of the invention
The objective of the invention is to propose a kind of 80 millimeters thick high-strength bridge steel-gas protectives and weld crucial welding procedure manufacturing technology, its problem that mainly solves is to have proposed the welding method that not preheating before the butt welding of a kind of rich argon shield welding procedure and matching materials welding large span high-strength bridge steel slab, postwelding are not heat-treated.
Realize the measure of above-mentioned purpose:
80 millimeters thick high-strength bridge steel gas are protected butt-welded method, its step:
1) adopting tensile strength is R
m>=570MPa, yield strength R
EL>=420MPa, percentage elongation: A>=18%, ballistic work-40
oCKV
2>=120J, thickness are the uniform thickness bridge steel butt joint of 80 mm; Welding wire tensile strength>=600 MPa of coupling, gage of wire Ф 1.2mm;
2) gas is protected the weldering groove and is adopted two-sided V-type symmetry groove, and bevel angle is 60 °, and root face is 2mm;
3) be 20%CO in welding current 262 ~ 270A, weldingvoltage 26 ~ 28V, speed of welding 28 ~ 29cm/min, weld heat input 14 ~ 16kJ/cm, employing percent by volume
2The rich argon that adds 80%Ar is made protection gas and its flow-control continuous sequence under the condition of 18 ~ 19L/min, so that till weld seam filled up, interlayer temperature was controlled at 100 ~ 110 ℃.
Preferably: the chemical constituent and the percentage by weight of the welding wire that adopts are: C:0.06 ~ 0.10%, Si:0.40 ~ 080%, Mn:1.50 ~ 1.90%, Ni:0.40 ~ 1. 0%, Ti:0. 06 ~ 0.15%, B:0.002 ~ 0.006%, P≤0.015%, S≤0.010, all the other are iron and unavoidable impurities.
Though its thickness of the present invention is up to 80 millimeters; And not preheating before banjo fixing butt jointing adopts and welds, postwelding is not heat-treated technology, through adopting the welding condition of a large amount of test and Selection; And carry out carrying out flaw detection; Find to have the phenomenon of crackle generation, welding point has good cryogenic property and cracking resistance ,-40 of joint three districts
oCKV
2Ballistic work reaches 145 ~ 260J, far above bridge slab banjo fixing butt jointing three districts-40 ℃ KV
2>=48J welding performance standard, joint three districts have higher impact flexibility deposit and margin of safety, can satisfy the key technology requirement that the long-span bridge beam bridge structure is made fully.
The present invention has following advantage:
(1) a kind of high-strength bridge steel slab gas shielded welding technique of proposing of the present invention, satisfied that China strides greatly, heavy duty, at a high speed, high strength, high tenacity new generation of bridge steel thick plate structure gas shielded welding technique key manufacture.Joint has good low-temperature flexibility, and joint three districts have higher impact flexibility deposit and margin of safety.
(2) adopt welding technique of the present invention; Gas shiled plumb joint overheated zone is mainly bainite structure; Weld metal is mainly tiny acicular ferrite structure, thereby makes weld seam have good low-temperature impact toughness, and joint has good cracking resistance and good fracture toughness.
(3) adopt welding technique of the present invention to realize the welding procedure that not preheating before the weldering of high-strength bridge steel thick plate structure manufacture process, postwelding are not heat-treated, weld seam still has higher ballistic work when adopting multilayer multiple tracks continuous sequence to connect technology.
Welding procedure of the present invention has good welding technological properties, and easy and simple to handle, suitable convenient, efficient, energy-conservation and suitable factory Longspan Bridge steel thick plate manufacturing is applied.
Description of drawings
Accompanying drawing is banjo fixing butt jointing groove figure of the present invention.
The specific embodiment
Describe in detail in the face of the present invention down:
Various embodiments of the present invention are according to following steps production, and in institute's limited range value.
Its step:
(1) adopting tensile strength is R
m>=570MPa, yield strength R
EL>=420MPa, percentage elongation: A>=18%, ballistic work-40
oCKV
2>=120J, thickness are the uniform thickness bridge steel butt joint of 80 mm; Welding wire tensile strength>=600 MPa of coupling, gage of wire Ф 1.2mm;
(2) gas is protected the weldering groove and is adopted two-sided V-type symmetry groove, and bevel angle is 60 °, and root face is 2mm;
(3) be 20%CO in welding current 262 ~ 270A, weldingvoltage 26 ~ 28V, speed of welding 28 ~ 29cm/min, weld heat input 14 ~ 16kJ/cm, employing percent by volume
2The rich argon that adds 80%Ar is made protection gas and its flow-control continuous sequence under the condition of 18 ~ 19L/min, so that till weld seam filled up, interlayer temperature was controlled at 100 ~ 110 ℃.
Embodiment 1:
Base material: employing tensile strength is R
mBe 600MPa, yield strength R
ELBe 500MPa, percentage elongation: A is 25%, ballistic work-40
oCKV
2For 223J, thickness is the uniform thickness bridge steel butt joint welding of 80 mm; The welding wire tensile strength of coupling is greater than 600 MPa, gage of wire Ф 1.2mm; Test plate (panel) is of a size of 600mm * 400mm * 80mm, and gas shiled weldering groove adopts the two-sided symmetrical groove of V-type, and bevel angle is 60 °, root face 2mm;
Welding material coupling: used welding wire is employed in chemical constituent and percentage by weight is: C:0.06 ~ 0.10%, Si:0.40 ~ 080%, Mn:1.50 ~ 1.90%, Ni:0.40 ~ 1. 0%, Ti:0. 06 ~ 0.15%, B:0.002 ~ 0.006%, P≤0.015%, S≤0.010, and all the other be that value prepares in the scope of iron and unavoidable impurities; The mechanical property of the deposited metal of welding wire is R
El: 520MPa, R
m: 650 MPa, percentage elongation A:24%, contraction percentage of area Z:73%, ballistic work-40 ℃ KV
2: 172J;
Welding procedure: 600MPa welding wire+rich argon (20%CO
2+80%Ar) technology is welded, welding current 262A, weldingvoltage 26V, speed of welding 28cm/min, weld heat input 14.5 kJ/cm, rich argon (20%CO
2+80%Ar) technology, argon-rich gas flow are 18L/min; Gas shiled weldering banjo fixing butt jointing adopts multilayer multiple tracks continuous sequence, and interlayer temperature is controlled at 101 ~ 104 ℃, and not preheating before the weldering, postwelding are not heat-treated.
Adopt said welding method welded high-strength bridge steel slab banjo fixing butt jointing mechanical property, through detecting weld seam tensile strength R
m: 605MPa, yield strength R
El: 550MPa, percentage elongation A:22%, contraction percentage of area Z:79%, weld seam ballistic work-40 ℃ KV
2: 174 J, melt run ballistic work-40 ℃ KV
2: 233 J, heat affected area (1mm)-40 ℃ KV
2: 216 J.
Embodiment 2:
Base material: employing tensile strength is R
mBe 605MPa, yield strength R
ELBe 505MPa, percentage elongation: A is 23%, ballistic work-40
oCKV
2For 233J, thickness is the uniform thickness bridge steel butt joint welding of 80 mm; The welding wire tensile strength of coupling is greater than 600 MPa, gage of wire Ф 1.2mm; Test plate (panel) is of a size of 600mm * 400mm * 80mm, and gas shiled weldering groove adopts two-sided symmetrical groove, and bevel angle is 60 °, root face 2mm;
Welding material coupling: used welding wire is employed in chemical constituent and percentage by weight is: C:0.06 ~ 0.10%, Si:0.40 ~ 080%, Mn:1.50 ~ 1.90%, Ni:0.40 ~ 1. 0%, Ti:0. 06 ~ 0.15%, B:0.002 ~ 0.006%, P≤0.015%, S≤0.010, and all the other be that value prepares in the scope of iron and unavoidable impurities; The mechanical property of the deposited metal of welding wire is R
El: 520MPa, R
m: 650 MPa, percentage elongation A:24%, Z:73%, ballistic work-40 ℃ KV
2: 172J;
Welding procedure: 600MPa welding wire+rich argon (20%CO
2+80%Ar) technology is welded, welding current 265A, weldingvoltage 27V, speed of welding 28.5cm/min, weld heat input 15 kJ/cm, rich argon (20%CO
2+80%Ar) technology, argon-rich gas flow are 19L/min; Gas shiled weldering banjo fixing butt jointing adopts multilayer multiple tracks continuous sequence, and interlayer temperature is controlled at 105 ~ 108 ℃, and not preheating before the weldering, postwelding are not heat-treated.
Adopt said welding method welded high-strength bridge steel slab banjo fixing butt jointing mechanical property, through detecting weld seam tensile strength R
m: 610MPa, yield strength R
El: 560MPa, percentage elongation A:21%, contraction percentage of area Z:78%, weld seam ballistic work-40 ℃ KV
2: 145 J, melt run ballistic work-40 ℃ KV
2: 180 J, heat affected area (1mm)-40 ℃ KV
2: 260 J.
Embodiment 3
Base material: employing tensile strength is R
mBe 595MPa, yield strength R
ELBe 490MPa, percentage elongation: A is 24%, ballistic work-40
oCKV
2For 219J, thickness is the uniform thickness bridge steel butt joint welding of 80 mm; The welding wire tensile strength of coupling is greater than 600 MPa, gage of wire Ф 1.2mm; Test plate (panel) is of a size of 600mm * 400mm * 80mm, and gas shiled weldering groove adopts two-sided symmetrical groove, and bevel angle is 60 °, root face 2mm;
Welding material coupling: used welding wire is employed in chemical constituent and percentage by weight is: C:0.06 ~ 0.10%, Si:0.40 ~ 080%, Mn:1.50 ~ 1.90%, Ni:0.40 ~ 1. 0%, Ti:0. 06 ~ 0.15%, B:0.002 ~ 0.006%, P≤0.015%, S≤0.010, and all the other be that value prepares in the scope of iron and unavoidable impurities; The mechanical property of the deposited metal of welding wire is R
El: 520MPa, R
m: 650 MPa, percentage elongation A:24%, Z:73%, ballistic work-40 ℃ KV
2: 172J;
Welding procedure: 600MPa welding wire+rich argon (20%CO
2+80%Ar) technology is welded, welding current 270A, weldingvoltage 28V, speed of welding 29cm/min, weld heat input 16 kJ/cm, rich argon (20%CO
2+80%Ar) technology, gas flow are 19L/min; Gas shiled weldering banjo fixing butt jointing adopts multilayer multiple tracks continuous sequence, and interlayer temperature is controlled at 106 ~ 109 ℃, and not preheating before the weldering, postwelding are not heat-treated.
Adopt said welding method welded high-strength bridge steel slab banjo fixing butt jointing mechanical property, through detecting weld seam tensile strength R
m: 600MPa, yield strength R
El: 545MPa, percentage elongation A:23%, contraction percentage of area Z:75%, weld seam ballistic work-40 ℃ KV
2: 164 J, melt run ballistic work-40 ℃ KV
2: 210 J, heat affected area (1mm)-40 ℃ KV
2: 250 J.
Claims (2)
1.80 millimeters thick high-strength bridge steel gas is protected butt-welded method, its step:
(1) adopting tensile strength is R
m>=570MPa, yield strength R
EL>=420MPa, percentage elongation: A>=18%, ballistic work-40
oCKV
2>=120J, thickness are the uniform thickness bridge steel butt joint of 80 mm; Welding wire tensile strength>=600 MPa of coupling, gage of wire Ф 1.2mm;
(2) gas is protected the weldering groove and is adopted two-sided V-type symmetry groove, and bevel angle is 60 °, and root face is 2mm;
(3) be 20%CO in welding current 262 ~ 270A, weldingvoltage 26 ~ 28V, speed of welding 28 ~ 29cm/min, weld heat input 14 ~ 16kJ/cm, employing percent by volume
2The rich argon that adds 80%Ar is made protection gas, and its flow-control continuous sequence under the condition of 18 ~ 19L/min, so that till weld seam filled up, interlayer temperature was controlled at 100 ~ 110 ℃.
2. 80 millimeters thick high-strength bridge steel gas as claimed in claim 1 are protected butt-welded method; It is characterized in that: the chemical constituent and the percentage by weight of the welding wire that adopts are: C:0.06 ~ 0.10%, Si:0.40 ~ 0.80%, Mn:1.50 ~ 1.90%, Ni:0.40 ~ 1. 0%, Ti:0. 06 ~ 0.15%, B:0.002 ~ 0.006%, P≤0.015%, S≤0.010, all the other are iron and unavoidable impurities.
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| CN103317216A (en) * | 2013-07-08 | 2013-09-25 | 武汉钢铁(集团)公司 | Gas-shield butt welding method for engineering structural steel of tension-resisting strength >/=650MPa |
| CN103894704A (en) * | 2014-04-08 | 2014-07-02 | 武汉钢铁(集团)公司 | High-strength bridge steel Q500qE thick plate gas protection butt welding method |
| CN105149746A (en) * | 2015-09-30 | 2015-12-16 | 山东钢铁股份有限公司 | Non-preheating gas shielded welding method for wear-resistant steel plate |
| CN111644730A (en) * | 2020-05-27 | 2020-09-11 | 武汉钢铁有限公司 | Gas shielded welding method for rack steel with thickness of more than or equal to 80mm |
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| CN111644730A (en) * | 2020-05-27 | 2020-09-11 | 武汉钢铁有限公司 | Gas shielded welding method for rack steel with thickness of more than or equal to 80mm |
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