CN103406638A - Method for manually welding bridge steel with yield strength no less than 500MPa - Google Patents

Method for manually welding bridge steel with yield strength no less than 500MPa Download PDF

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Publication number
CN103406638A
CN103406638A CN2013102829490A CN201310282949A CN103406638A CN 103406638 A CN103406638 A CN 103406638A CN 2013102829490 A CN2013102829490 A CN 2013102829490A CN 201310282949 A CN201310282949 A CN 201310282949A CN 103406638 A CN103406638 A CN 103406638A
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welding
equal
larger
500mpa
yield strength
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CN103406638B (en
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缪凯
牟文广
陈浮
李立军
黄治军
胡因红
王靓
许颖
胡家国
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Group Corp
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Abstract

Provided is a method for manually welding bridge steel with the yield strength no less than 500MPa. The performance of applicable base plates is as follows: R<eL> is larger than or equal to 500MPa, R<m> is lager than or equal to 650MPa, A is larger than or equal to 18%, and -40DEG C KV<2> is larger than or equal to 120J. The thickness of all plates in combination is 32mm. A welding groove is in a two-sided V-shaped symmetrical mode, the angle of the groove is 60 degrees, the thickness of the truncated edge is 2mm, the tensile strength of matched welding rods is larger than or equal to 650MPa, the diameter phi of each welding rod is 4.0mm, the welding current is 165-175A, the welding voltage is 25-26V, the welding speed is 15cm/min, the linear energy is 17-18kJ/cm, the baking system of each welding rod is 350DEG C * 1h, and multilayer multichannel continuous welding is adopted. According to the method, the requirements for the process for manually welding thick plate structures in the process of building a large-span roadway-and-highway dual purpose bridge with the span larger than 1000 meters are met, the butt joint three area impact energy -40 DEG C KV<2>=83-126J, the fusion line impact energy -40 DEG C KV<2>=136-172J, the heat affected zone (1mm) -40 DEG C KV<2>=126-215J, joint three areas have high impact toughness storage and safety margin, the impact toughness storage and the safety margin of the joint three areas are far higher than the welding standard, -40 DEG C KV<2> is larger than or equal to 48J, of the butt joint three areas of the bridge steel, preheating does not need to be conducted before welding, and heat treatment does not need to be conducted after welding.

Description

Yield strength >=500MPa level bridge steel manual welding method
Technical field
The present invention relates to a kind of manual welding method, belong to the manual welding method of high strength bridge thick plate structure with steel, be applicable to yield strength>=500MPa, tensile strength R m>=650MPa, percentage elongation A>=18% ,-40 oCKV 2The manual docking of the bridge slab of ballistic work>=120J welding method.
Background technology
Along with the development of economic construction, the development of transportation is also an important aspect, itself or even the industry that must develop in advance.Bridge construction as China is advanced by leaps and bounds especially, constantly to high strength, large span, heavy load, the development of high-speed aspect.If intended building at the Yangtze Bridge large span public affairs, the dual-purpose bridge of iron of 6 line highways, 4 line railways, and its main spanning degree is more than 1000 meters.Should say from span, belong to the public affairs of world today's upper span maximum, the highway and railway bi-purpose cable-stayed bridge of iron combined bridge.
But along with the needs of this bridge construction development, steel used are base material, and the welding procedure of base material all must be carried out the adaptability research and development.Along with base material yield strength>=500MPa, tensile strength R m>=650MPa, percentage elongation A>=18% ,-40 oCKV 2The exploitation of the bridge steel of ballistic work>=120J, the welding material matched and welding procedure must be researched and developed simultaneously.Otherwise, just can not solve timely and effectively weldability and supporting welding material and the welding procedure problem of Longspan Bridge steel grade, will directly hinder applying of China's Longspan Bridge manufacture and new steel grade.
Through retrieval, Chinese patent. application number is " methods of 80 millimeters thick high-strength bridge steels docking manual weldings " patent documentation of 201210279121, its disclose a kind of employing tensile strength for>=570MPa, yield strength R EL>=420MPa, percentage elongation A>=18% ,-40 oCKV 2The high-strength bridge steel of ballistic work>=120J, its thickness are 80 mm, and are identical thickness of slab combination docking manual welding; The welding rod tensile strength of coupling is greater than 600 MPa, core diameter Ф 4.0mm; The manual welding groove adopts the symmetrical groove of X-type, and bevel angle is 60 °, and root face is 1mm; Under welding current 165 ~ 170A, weldingvoltage 24 ~ 25V, speed of welding 14 ~ 15cm/min, weld heat input 16 ~ 17kJ/cm condition, adopt continuous sequence, so that till weld seam filled up, interlayer temperature was controlled at 135 ~ 145 ℃.
The base material steel grade tensile strength rank of its welding is not only low, and namely at 570 ~ 650MPa, the intensity rank of welding material is 600 MPa, and it is not suitable for the manual connection technology requirement of span at the highway more than 1000 meters and the dual-purpose bridge of railway.
For the construction of large span high strength bridge structure, the key issue of its solution is to guarantee under the prerequisite that safety is on active service, and the rear structure of welding is indeformable, flawless produces, and joint has good mechanical property and low-temperature flexibility.Along with the raising of bridge construction substrate intensity, especially from current Q420qE, bring up to Q500qE, not preheating before weldering, under the not heat treated condition of postwelding, guarantee the primary key technology that the medium-and-large-sized steel construction of welding process does not split, constantly security becomes manufacture process.And current this high-strength large-scale manufacture of steel structure process to crack while preventing from welding be to carry out weld preheating, post weld heat treatment, this just means the difficulty of construction environment, manufacturing cost and manufacturing cycle.
Summary of the invention
The object of the present invention is to provide a kind of for span be greater than more than 1000 meters, yield strength>=500MPa, tensile strength R m>=650MPa, percentage elongation A>=18% ,-40 oCKV 2Ballistic work>=120J bridge steel slab manual welding method, guaranteeing under the prerequisite of welding performance, without weld preheating, postwelding heat-treat, joint-40 oCKV 2Ballistic work, at 83 ~ 126J, has higher impact flexibility deposit and the yield strength of margin of safety>=500MPa level bridge steel manual welding method.
Realize the measure of above-mentioned purpose
Yield strength >=500MPa level bridge steel manual welding method, its step:
(1) applicable substrate mechanical property is: yield strength R EL>=500MPa, tensile strength R m>=650MPa, percentage elongation A>=18% ,-40 oCKV 2Ballistic work>=120J; Applicable slab is combined as 32mm+32mm, and welding manner is manual butt welding, and not preheating before weldering, and postwelding is not heat-treated;
(2) manual docking welding groove type is the symmetrical groove of two-sided V-type, and bevel angle is 60 °, root face 2mm;
(3) welding material of coupling: the tensile strength >=650MP of welding rod, core diameter Ф 4.0mm;
(4) welding condition: welding current 165 ~ 175A, weldingvoltage 25 ~ 26V, speed of welding ~ 15cm/min, weld heat input 17 ~ 18kJ/cm, welding rod baking regime are 350 ℃ * 1h;
(5) adopt multilayer multiple tracks continuous sequence, and the control interlayer temperature is no more than 210 ℃.
It is characterized in that: the chemical constituent of described welding rod and percentage by weight are: C:0.060 ~ 0.012%, Si:0.20～0.60%, Mn≤1.80%, Ni:1.1 ~ 1.50%, Mo≤0.50% P≤0.015%, S≤0.008%, all the other are Fe and inevitable impurity.
Disclosed by the invention have a following advantage:
(1) the present invention can meet span and is greater than that large span more than 1000 meters is public, the dual-purpose bridge construction cut deal of iron structure manual welding technique, and manual welding joint overheated zone is owing to being mainly bainite structure, weld metal is mainly tiny acicular ferrite structure, make joint have good low-temperature flexibility, good cracking resistance, good fracture toughness, banjo fixing butt jointing three district's ballistic work-40 ℃ KV 2=83 ~ 126 J, melt run ballistic work-40 ℃ KV 2=136 ~ 172 J, heat affected area (1mm)-40 ℃ KV 2=126 ~ 215J, reach joint 3rd district and have higher impact flexibility deposit and margin of safety, and it is far above bridge steel banjo fixing butt jointing 3rd district-40 ℃ KV 2>=48J welding performance standard.
(2) realized the welding procedure that not preheating before the weldering of high-strength bridge steel thick plate structure manufacture process, postwelding are not heat-treated.While adopting multilayer multiple tracks continuous sequence technique, weld seam still has higher ballistic work.
(3) the present invention is easy and simple to handle, easy to use, and efficient, energy-conservation, and the Longspan Bridge steel thick plate manufacture of applicable factory is applied.
The accompanying drawing explanation
Accompanying drawing is the manual banjo fixing butt jointing groove of the present invention figure.
The specific embodiment
Below the present invention is described in detail:
Various embodiments of the present invention are according to following steps production, and in institute's limited range value arbitrarily.
Its step:
(1) applicable substrate mechanical property is: R m>=650MPa, yield strength R EL>=500MPa, percentage elongation: A>=18%, ballistic work-40 oCKV 2>=120J; Substrate thickness: 32 mm+32 mm; Welding manner is manual butt welding, and not preheating before weldering, and postwelding is not heat-treated;
(2) groove type adopts the symmetrical groove of two-sided V-type, and bevel angle is 60 °, root face 2mm;
(3) welding material of coupling: the welding rod of coupling is tensile strength >=650 MPa, core diameter Ф 4.0mm;
(4) technological parameter of welding: continuous sequence under the condition of welding current 165 ~ 175A, weldingvoltage 25 ~ 26V, speed of welding 15cm/min, weld heat input 17 ~ 18kJ/cm, so that till weld seam filled up, interlayer temperature was controlled at and is no more than 210 ℃.
Welding rod deposited metal composition and weight percent content are: C:0.060 ~ 0.012%, Si:0.20～0.60%, Mn≤1.80%, Ni:1.1 ~ 1.50%, Mo≤0.50% P≤0.015%, S≤0.008%, all the other are made for any outfit in Fe and inevitable impurity scope; The mechanical property of its deposited metal is R El=585MPa, R m=670 MPa, A=25%, Z=71%, ballistic work-40 ℃ KV 2=107J.
Embodiment 1
The substrate that bridge is used: slab is combined as 32mm+32mm, and mechanical property is: yield strength R EL: 530MPa, tensile strength R m: 661MPa, percentage elongation A:21% ,-40 oCKV 2The base material test plate (panel) of ballistic work: 130J; Test plate (panel) is of a size of 600mm * 400mm * 32mm;
The groove of manual butt welding is shaped as the symmetrical groove of two-sided V, and bevel angle is 60 °, and root face is 2mm;
Matingofwelding material: the tensile strength>=650MP of welding rod, core diameter Ф 4.0mm, the mechanical property of deposited metal is R El=585MPa, R m=670 MPa, A=25%, Z=71%, ballistic work-40 ℃ KV 2=107J;
Welding condition: welding current 165 ~ 175A, weldingvoltage 25 ~ 26V, speed of welding is ~ 15cm/min that weld heat input is 17 ~ 18 kJ/cm.
After adopting multilayer multiple tracks continuous sequence and filling up, the base material test plate (panel) is docked to welding, and interlayer temperature is controlled to 170 ~ 180 ℃, under the prerequisite of heat-treating without weld preheating, postwelding, the banjo fixing butt jointing mechanical property after testing, its weld seam tensile strength R m=706MPa, joint clod wash d=3a, 180 ° are qualified, weld seam ballistic work-40 ℃ KV 2=83J, melt run ballistic work-40 ℃ KV 2=136 J, heat affected area (1mm)-40 ℃ KV 2=126J.Its joint mechanical property meets the demands fully.
Embodiment 2
The substrate that bridge is used: slab is combined as 32mm+32mm, and mechanical property is: yield strength R EL: 550MPa, tensile strength R m: 650MPa, percentage elongation A:22% ,-40 oCKV 2The base material test plate (panel) of ballistic work: 140J; Test plate (panel) is of a size of 600mm * 400mm * 32mm;
The groove of manual butt welding is shaped as the symmetrical groove of two-sided V, and bevel angle is 60 °, and root face is 2mm;
Matingofwelding material: the tensile strength>=650MP of welding rod, core diameter Ф 4.0mm, the mechanical property of deposited metal is R El=585MPa, R m=670 MPa, A=25%, Z=71%, ballistic work-40 ℃ KV 2=107J;
Welding condition: welding current 165 ~ 175A, weldingvoltage 25 ~ 26V, speed of welding is ~ 15cm/min that weld heat input is 17 ~ 18 kJ/cm.
After adopting multilayer multiple tracks continuous sequence and filling up, the base material test plate (panel) is carried out to craft docking welding, and interlayer temperature is controlled to 180 ~ 210 ℃, under the prerequisite of heat-treating without weld preheating, postwelding, the banjo fixing butt jointing mechanical property after testing, its weld seam tensile strength R m=738MPa, joint clod wash d=3a, 180 ° are qualified, weld seam ballistic work-40 ℃ KV 2=126J, melt run ballistic work-40 ℃ KV 2=172 J, heat affected area (1mm)-40 ℃ KV 2=215J, its joint mechanical property meets the demands fully.
Above-described embodiment only exemplifies for the best, and is not the restriction to embodiments of the present invention.

Claims (2)

1. yield strength >=500MPa level bridge steel manual welding method, its step:
(1) applicable substrate mechanical property is: yield strength R EL>=500MPa, tensile strength R m>=650MPa, percentage elongation A>=18% ,-40 oCKV 2Ballistic work>=120J; Applicable slab is combined as 32mm+32mm, and welding manner is manual butt welding, and not preheating before weldering, and postwelding is not heat-treated;
(2) manual docking welding groove type is the symmetrical groove of two-sided V-type, and bevel angle is 60 °, root face 2mm;
(3) welding material of coupling: the tensile strength >=650MP of welding rod, core diameter Ф 4.0mm;
(4) welding condition: welding current 165 ~ 175A, weldingvoltage 25 ~ 26V, speed of welding ~ 15cm/min, weld heat input 17 ~ 18kJ/cm, welding rod baking regime are 350 ℃ * 1h;
(5) adopt multilayer multiple tracks continuous sequence, and the control interlayer temperature is no more than 210 ℃.
2. yield strength as claimed in claim 1 >=500MPa level bridge steel manual welding method, it is characterized in that: the chemical constituent of described welding rod and percentage by weight are: C:0.060 ~ 0.012%, Si:0.20～0.60%, Mn≤1.80%, Ni:1.1 ~ 1.50%, Mo≤0.50% P≤0.015%, S≤0.008%, all the other are Fe and inevitable impurity.
CN201310282949.0A 2013-07-08 2013-07-08 Yield strength >=500MPa level bridge steel manual welding method Expired - Fee Related CN103406638B (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103934542A (en) * 2014-04-08 2014-07-23 武汉钢铁(集团)公司 High-strength-level Q500qE bridge steel manual welding method
CN104625342A (en) * 2014-12-19 2015-05-20 山东钢铁股份有限公司 Welded joint welding technology for high-performance bridge steel angle with yield strength being 500 MPa
CN105014189A (en) * 2015-07-09 2015-11-04 武汉钢铁(集团)公司 Shielded metal arc welding method for high-manganese non-magnetic steel with tensile strength of 1000 MPa
CN108581136A (en) * 2018-05-18 2018-09-28 东北大学 A kind of gas-shield welding method of low-carbon Q420q bridge steels
CN110455662A (en) * 2019-08-23 2019-11-15 合肥通用机械研究院有限公司 Ferritic steel ballistic work and fracture toughness rule-of-thumb relation determine method
CN110666289A (en) * 2019-09-09 2020-01-10 中铁九桥工程有限公司 Manual welding vertical position butt joint method for high-performance weather-resistant bridge steel

Citations (5)

* Cited by examiner, † Cited by third party
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JP2007007704A (en) * 2005-07-01 2007-01-18 Katsura Steel:Kk Method for welding steel plate and device for gouging the same
JP2007290032A (en) * 2006-03-28 2007-11-08 Nippon Steel Corp Electric arc welded steel joint with excellent fatigue strength, welding method therefor and steel structure
CN101332528A (en) * 2008-08-04 2008-12-31 武汉钢铁(集团)公司 High intensity bridge steel manual welding technique method
CN101342630A (en) * 2008-07-01 2009-01-14 武汉钢铁(集团)公司 Buried arc welding method for high-strength T shaped contact of bridge steel
CN101564783A (en) * 2009-06-05 2009-10-28 武汉钢铁(集团)公司 Manual welding method applied to butt joint of high-tensile steel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007007704A (en) * 2005-07-01 2007-01-18 Katsura Steel:Kk Method for welding steel plate and device for gouging the same
JP2007290032A (en) * 2006-03-28 2007-11-08 Nippon Steel Corp Electric arc welded steel joint with excellent fatigue strength, welding method therefor and steel structure
CN101342630A (en) * 2008-07-01 2009-01-14 武汉钢铁(集团)公司 Buried arc welding method for high-strength T shaped contact of bridge steel
CN101332528A (en) * 2008-08-04 2008-12-31 武汉钢铁(集团)公司 High intensity bridge steel manual welding technique method
CN101564783A (en) * 2009-06-05 2009-10-28 武汉钢铁(集团)公司 Manual welding method applied to butt joint of high-tensile steel

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103934542A (en) * 2014-04-08 2014-07-23 武汉钢铁(集团)公司 High-strength-level Q500qE bridge steel manual welding method
CN104625342A (en) * 2014-12-19 2015-05-20 山东钢铁股份有限公司 Welded joint welding technology for high-performance bridge steel angle with yield strength being 500 MPa
CN105014189A (en) * 2015-07-09 2015-11-04 武汉钢铁(集团)公司 Shielded metal arc welding method for high-manganese non-magnetic steel with tensile strength of 1000 MPa
CN108581136A (en) * 2018-05-18 2018-09-28 东北大学 A kind of gas-shield welding method of low-carbon Q420q bridge steels
CN110455662A (en) * 2019-08-23 2019-11-15 合肥通用机械研究院有限公司 Ferritic steel ballistic work and fracture toughness rule-of-thumb relation determine method
CN110666289A (en) * 2019-09-09 2020-01-10 中铁九桥工程有限公司 Manual welding vertical position butt joint method for high-performance weather-resistant bridge steel

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