CN101905365A - Welding method of ultra-thick and high-strength water-power steel - Google Patents
Welding method of ultra-thick and high-strength water-power steel Download PDFInfo
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Abstract
The invention relates to a welding method of ultra-thick and high-strength water-power steel, belonging to the welding field. Welding is realized by adopting a mixed welding mode, i.e. hand welding is adopted as a basis for filling the bottom, and gas shielded welding is adopted for a middle layer and a cover part, multilayer and multi-pass welding are adopted, a carbon arc is cropped out after a single side is filled, and the input of welding heat is controlled within 65 kJ/cm. A welding bevel adopts an asymmetric U-shaped bevel, a thick steel plate of 145-155 mm is preheated to 100 DEG C before welding, the inter-layer temperature is kept between 100 DEG C to 160 DEG C, and heat treatment stress is not carried out after welding, and the problem of reheat embrittlement of a welding joint of the high-strength water-power steel is solved. The invention needs simple welding equipment, realizes welding through a combined welding process on the basis of the traditional equipment, reduces the filling amount of welding metal, and achieves the welding effect of a narrow gap. Compared with the hand arc welding, the invention greatly improves the welding efficiency of the thick steel plate and lowers the possibility of welding defects easily generated on the hand arc welding of an ultra-thick steel plate, such as cold cracks, incomplete fusion, crisp fusion, and the like.
Description
Technical field
The invention belongs to welding field, relate to a kind of welding method of super thick high-strength water-power steel, be not only applicable to the welding of ultra-thick and high-strength water-power steel, also be applicable to the welding of other ultra-thick low-alloy steel.
Background technology
Along with the domestic water power head is increasing, the unit installed capacity is more and more big, and water-power steel begins progressively to develop to the direction of high strength, big thickness.For adapting to the needs of China's construction of hydropower plant, Shoudu Iron and Steel Co has successfully been developed a kind of super other water-power steel of thickness 610MPa level, and the thickness specification reaches 150mm, and its comprehensive mechanical property also reaches the product of external like product, has filled up domestic blank.But, also there is not a relevant report about the welding of the high-strength water-power steel steel plate of this super thickness specification is domestic, therefore press for and develop the welding procedure that is fit to this ultra-thick and high-strength water-power steel.
The main method that adopts manual electric arc welding of scene welding of the high-strength water-power steel of big thickness 610MPa, welding efficiency is low, need to strike slag, polishing between welding bead, and in welding process, also be prone to problems such as incomplete fusion, cold crack and joint embrittlement, especially under this super thickness situation, these problems are more serious.At present, domestic welding at ultra-thick steel plates is generally adopted special-purpose narrow gap welding to connect equipment and is welded, but mostly at elevated temperature vessel steel among some big thickness C r-Mo, the report of the also not relevant narrow gap of high-strength water-power steel gas shiled weldering welding.And since narrow gap welding to connect equipment very valuable, and job site, power station inclement condition, this technology also is not suitable for the hydroelectric project site operation, therefore presses for the welding method of developing a kind of both succinct and effective and suitable ultra-thick and high-strength water-power steel.
Summary of the invention
The present invention seeks to adopt the method for manual electric arc welding for the scene welding of the high-strength water-power steel that solves big thickness 610MPa, welding efficiency is low, need between welding bead to strike slag, polishing, and in welding process, also be prone to incomplete fusion, problem such as cold crack and joint embrittlement.
A kind of welding method of ultra-thick and high-strength water-power steel is characterized in that: comprise following steps:
(1) adopt tensile strength 610MPa～720MPa, yield strength is greater than 490MPa, and percentage elongation is the steel of 100-250J greater than 17%, 1/4 thickness of slab place-20 ℃ impact absorbing energy, and its thickness is 145～155mm, adopts the mode of the dull and stereotyped butt joint of stack pile steel plate;
(2) be prone to weld defects such as welding cold cracking, incomplete fusion in the ultra-thick steel plates for avoiding, weld 100 ℃ of preceding 145～155mm steel plate preheatings, interlayer temperature remains between 100～160 ℃, and postwelding is not heat-treated to disappear and answered, and has avoided the high-strength water-power steel welding point problem of thermal embrittlement again.
(3) for realizing efficient welding, reduce the welding wire loading, guarantee not occur weld defect, take asymmetric U-shaped bevel, root face a is 3-5mm, and gap b is 2-4mm, upward slope prostomum degree is 18 °, and descending prostomum degree is 16 °, and the arc radius R of groove bottom is 7.5～8.5 up and down; Concrete groove type is seen shown in Figure 1.
(4) Pi Pei welding wire selects for use diameter to be
The Atlantic Ocean produce CHW-65A, cladding metal anti-stretching intensity is greater than 610MPa, welding rod is selected the J607RH of Shanghai Electric Power for use, core diameter is
(5) welding manner adopts and mixes welding manner, bottom bottoming and bottom are filled and are adopted manual welding technology, middle filling and capping partly adopt rich argon hybrid protection gas welder skill, concrete welding condition is as follows: the manual electric arc welding technological parameter is: welding current 160～175A, weldingvoltage 24～28V, speed of welding is 9～12cm/min; 80%Ar+20%CO
2Gaseous mixture protection weldering welding condition: welding current 250～270A, weldingvoltage 26～30V, speed of welding 4～5mm/s, gas flow are 20～25L/min.Postwelding is not heat-treated to disappear and is answered.
The chemical composition and the percentage by weight of the thick high-strength water-power steel of described 145～155mm are: C≤0.15, and Si 0.15～0.40, and Mn 1.0～1.6, Ni≤0.7, Mo≤0.5, Cr≤0.5, B≤0.004, V≤0.01, Nb≤0.05, Ti≤0.05, S≤0.005, P≤0.005, all the other are Fe and impurity element, this steel P
CmBe 0.27, tensile strength 610MPa～720MPa, yield strength is greater than 490MPa, and percentage elongation is 100-250J greater than 17%, 1/4 thickness of slab place-20 ℃ impact absorbing energy; The tensile strength of postwelding joint area is greater than 610MPa, and yield strength is greater than 490MPa, and percentage elongation is intact when crooked greater than 17%, 180 ° of D=3a, and the outer 1.0mm place of weld seam, melt run and melt run heat affected area-20 ℃ impact absorbing energy is greater than 47J.
For avoiding being prone to Welding Problems such as welding cold cracking, incomplete fusion, joint embrittlement in the ultra-thick steel plates; change the low present situation of its manual electric arc welding welding efficiency; adopt and mix the welding manner welding; fill manual welding bottoming and bottom; intermediate layer and capping partly adopt the mixing welding of gas shiled weldering welding; be the welding of multilayer multiple tracks, after single face fills up, carry out the carbon arc air gouging back chipping.
For guaranteeing the requirement of outer-20 ℃ of impact absorbing energies of weld seam, melt run and melt run 1.0mm greater than 47J, the sweating heat input is controlled in the 65kJ/cm.
The present invention compares with present situation:
(1) required welding equipment is simple, needn't buy valuable narrow gap welding and connect equipment; On the basis of existing equipment,, reduced the weld metal loading, reached the welding effect in narrow gap by the assembled welding process welding.
(2) with respect to manual electric arc welding, this method has promoted the welding efficiency of ultra-thick steel plates greatly, and has reduced super thickness steel plate manual electric arc welding and easily produce weld defects such as cold crack, incomplete fusion and joint embrittlement and produce probability.
(3) by the control welding procedure, effectively guaranteed welding quality, guaranteed welding point each zone-20 ℃ impact flexibility greater than 47J, tensile strength is greater than the requirement of 610MPa, and bigger surplus capacity is arranged.
(4) mix welding manner, avoided single gas shiled weldering welding gun to be deep in the groove, and the design of groove, reduced the welding wire loading, guaranteed efficient high quality welding.The hammering mode that disappears and answer has in addition reduced the heat treatment of high-strength water-power steel ultra-thick plate and has disappeared and should easily produce the problem of thermal embrittlement again.
Description of drawings
Fig. 1 is the groove schematic diagram of 150mm+150mm for the steel plate combination thickness of welding.
The specific embodiment:
The present invention will be further described below in conjunction with case study on implementation:
Case study on implementation 1
The thick 610MPa rank of base material: 150mm 07MnCrMoVR high-strength water-power steel, tensile strength is 670MPa, quenched and tempered state, welding steel is combined as 150mm+150mm.Test plate (panel) is of a size of 600mm * 230mm * 150mm, and bevel for welding adopts asymmetric U-shaped bevel, and the groove size is seen shown in the figure.
Welding material: manual welding rod diameter is
The mechanical property of deposited metal is ReL:540MPa, Rm:660MPa, and A:22% ,-20 ℃ of AKV ballistic works are 150J; The gas protection wire diameter is
The mechanical property of deposited metal is ReL:540MPa, Rm:660MPa, and A:22% ,-20 ℃ of AKV ballistic works are 150J.
Welding procedure: adopt the mixing welding procedure to carry out the welding of 150mm steel plate, bottom section adopts the welding of manual electric arc welding technology, and its technological parameter is: welding current 160A, weldingvoltage 27V, speed of welding 10cm/min, weld heat input 25.9kJ/cm; Zone line and surf zone adopt 80%Ar+20%CO2 gas shiled weldering welding, and its technological parameter is: welding current 270A, gas shiled weldering weldingvoltage 30V, gas shiled weldering speed of welding 5mm/s, gas flow 25L/min, heat input 16.2kJ/cm.Preheat temperature is 100 ℃, and interlayer temperature is controlled between 100 ℃-180 ℃.The mode that adopts vibration to disappear and answer between welding bead, the thermal embrittlement phenomenon again of answering welding point to occur to avoid post weld heat treatment to disappear.
Adopt above-mentioned technology that the thick 07MnCrMoVR high-strength water-power steel of 150mm is welded.Postwelding, its joint tensile strength is 655MPa, and yield strength is 535MPa, and fracture position is a mother metal, and heat affected area-20 ℃ Akv impact absorbing energy mean value is 167J, weld seam-20 ℃ Akv impact absorbing energy mean value is 80J.
Case study on implementation 2
The thick 610MPa rank of base material: 150mm 07MnCrMoVR high-strength water-power steel, tensile strength is 690MPa, quenched and tempered state, welding steel is combined as 150mm+150mm.Test plate (panel) is of a size of 600mm * 230mm * 150mm, and bevel for welding adopts asymmetric U-shaped bevel, and the groove size is seen shown in the figure.
Welding material: manual welding rod diameter is
The mechanical property of deposited metal is ReL:540MPa, Rm:660MPa, and A:22% ,-20 ℃ of AKV ballistic works are 150J; The gas protection wire diameter is
The mechanical property of deposited metal is ReL:540MPa, Rm:660MPa, and A:22% ,-20 ℃ of AKV ballistic works are 150J.
Welding procedure: adopt the mixing welding procedure to carry out the welding of 150mm steel plate, bottom section adopts the welding of manual electric arc welding technology, and its technological parameter is: welding current 170A, weldingvoltage 26V, speed of welding 10cm/min, weld heat input 26.5kJ/cm; Zone line and surf zone adopt 80%Ar+20%CO2 gas shiled weldering welding, and its technological parameter is: welding current 260A, gas shiled weldering weldingvoltage 30V, gas shiled weldering speed of welding 4mrn/s, gas flow 25L/min, heat input 19.5kJ/cm.Preheat temperature is 100 ℃, and interlayer temperature is controlled between 100 ℃-180 ℃.The mode that adopts vibration to disappear and answer between welding bead, the thermal embrittlement phenomenon again of answering welding point to occur to avoid post weld heat treatment to disappear.
Adopt above-mentioned technology that the thick 07MnCrMoVR high-strength water-power steel of 150mm is welded.Postwelding, its joint tensile strength is 665MPa, and yield strength is 565MPa, and fracture position is a mother metal, and heat affected area-20 ℃ Akv impact absorbing energy mean value is 177J, weld seam-20 ℃ Akv impact absorbing energy mean value is 75J.
Case study on implementation 3
The thick 610MPa rank of base material: 150mm 07MnCrMoVR high-strength water-power steel, tensile strength is 680MPa, quenched and tempered state, welding steel is combined as 150mm+150mm.Test plate (panel) is of a size of 600mm * 230mm * 150mm, and bevel for welding adopts asymmetric U-shaped bevel, and the groove size is seen shown in Figure 1.
Welding material: manual welding rod diameter is
The mechanical property of deposited metal is ReL:540MPa, Rm:660MPa, and A:22% ,-20 ℃ of AKV ballistic works are 150J; The gas protection wire diameter is
The mechanical property of deposited metal is ReL:540MPa, Rm:660MPa, and A:22% ,-20 ℃ of AKV ballistic works are 150J.
Welding procedure: adopt the mixing welding procedure to carry out the welding of 150mm steel plate, bottom section adopts the welding of manual electric arc welding technology, and its technological parameter is: welding current 160A, weldingvoltage 28V, speed of welding 11cm/min, weld heat input 24.4kJ/cm; Zone line and surf zone adopt 80%Ar+20%CO2 gas shiled weldering welding, and its technological parameter is: welding current 270A, gas shiled weldering weldingvoltage 28V, gas shiled weldering speed of welding 4mm/s, gas flow 25L/min, heat input 18.9kJ/cm.Preheat temperature is 100 ℃, and interlayer temperature is controlled between 100 ℃-180 ℃.The mode that adopts vibration to disappear and answer between welding bead, the thermal embrittlement phenomenon again of answering welding point to occur to avoid post weld heat treatment to disappear.
Adopt above-mentioned technology that the thick 07MnCrMoVR high-strength water-power steel of 150mm is welded.Postwelding, its joint tensile strength is 675MPa, and yield strength is 565MPa, and fracture position is a mother metal, and heat affected area-20 ℃ Akv impact absorbing energy mean value is 170J, weld seam-20 ℃ Akv impact absorbing energy mean value is 80J.
Claims (4)
1. the welding method of a ultra-thick and high-strength water-power steel is characterized in that: comprise following steps:
(1) adopt tensile strength 610MPa～720MPa, yield strength is greater than 490MPa, and percentage elongation is the steel of 100-250J greater than 17%, 1/4 thickness of slab place-20 ℃ impact absorbing energy, and steel plate thickness is 145～155mm, adopts the mode of the dull and stereotyped butt joint of stack pile steel plate;
(2) be prone to weld defects such as welding cold cracking, incomplete fusion in the ultra-thick steel plates for avoiding, weld 100 ℃ of preceding 145～155mm steel plate preheatings, interlayer temperature remains between 100～160 ℃, and postwelding is not heat-treated to disappear and answered, and has avoided the high-strength water-power steel welding point problem of thermal embrittlement again;
(3) for realizing efficient welding, reduce the welding wire loading, guarantee not occur weld defect, take asymmetric U-shaped bevel, root face a is 3-5mm, and gap b is 2-4mm, upward slope prostomum degree is 18 °, and descending prostomum degree is 16 °, and the arc radius R of groove bottom is 7.5～8.5 up and down;
(4) Pi Pei welding wire selects for use diameter to be
The Atlantic Ocean produce CHW-65A, cladding metal anti-stretching intensity is greater than 610MPa, welding rod is selected the J607RH of Shanghai Electric Power for use, core diameter is
(5) welding manner adopts and mixes welding manner, bottom bottoming and bottom are filled and are adopted manual welding technology, middle filling and capping partly adopt rich argon hybrid protection gas welder skill, concrete welding condition is as follows: the manual electric arc welding technological parameter is: welding current 160～175A, weldingvoltage 24～28V, speed of welding is 9～12cm/min; 80%Ar+20%CO
2Gaseous mixture protection weldering welding condition: welding current 250～270A, weldingvoltage 26～30V, speed of welding 4～5mm/s, gas flow are 20～25L/min.Postwelding is not heat-treated to disappear and is answered.
2. the welding method of a kind of ultra-thick and high-strength water-power steel as claimed in claim 1, it is characterized by: the chemical composition and the percentage by weight of the thick high-strength water-power steel of described 145～155mm are: C≤0.15, Si 0.15～0.40, Mn 1.0～1.6, Ni≤0.7, Mo≤0.5, Cr≤0.5, B≤0.004, V≤0.01, Nb≤0.05, Ti≤0.05, S≤0.005, P≤0.005, all the other are Fe and impurity element, this steel P
CmBe 0.27, tensile strength 610MPa～720MPa, yield strength is greater than 490MPa, and percentage elongation is 100-250J greater than 17%, 1/4 thickness of slab place-20 ℃ impact absorbing energy; The tensile strength of postwelding joint area is greater than 610MPa, and yield strength is greater than 490MPa, and percentage elongation is intact when crooked greater than 17%, 180 ° of D=3a, and the outer 1.0mm place of weld seam, melt run and melt run heat affected area-20 ℃ impact absorbing energy is greater than 47J.
3. the welding method of a kind of ultra-thick and high-strength water-power steel according to claim 1; it is characterized by: adopt and mix the welding manner welding; fill manual welding bottoming and bottom; intermediate layer and capping partly adopt the mixing welding of gas shiled weldering welding; be the welding of multilayer multiple tracks; after single face fills up, carry out the carbon arc air gouging back chipping.
4. the welding method of a kind of ultra-thick and high-strength water-power steel according to claim 1 is characterized by: be to guarantee the requirements of outer-20 ℃ of impact absorbing energies of weld seam, melt run and melt run 1.0mm greater than 47J, the sweating heat input is controlled in the 65kJ/cm.
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| CN108994424A (en) * | 2018-09-26 | 2018-12-14 | 上海核工程研究设计院有限公司 | A kind of steel containment vessel release post weld heat treatment welding procedure |
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| CN111482680A (en) * | 2020-04-21 | 2020-08-04 | 西安热工研究院有限公司 | Narrow-gap welding groove and welding method for thick-wall pipeline |
| CN112620889A (en) * | 2021-03-10 | 2021-04-09 | 陕西重型机械制造有限公司 | Q500qDNH welding method for special weathering steel with yield strength of 500MPa for bridge |
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Address after: 100043 Shougang Technology Research Institute, 69 Yang Zhuang Street, Shijingshan District, Beijing Co-patentee after: Three Gorges Electromechanical Manufacturing and Installation Project Department of Sinohydro Bureau 8 Co., Ltd. Patentee after: Shougang Group Co. Ltd. Address before: 100043 Shougang Technology Research Institute, 69 Yang Zhuang Street, Shijingshan District, Beijing Co-patentee before: Three Gorges Electromechanical Manufacturing and Installation Project Department of Sinohydro Bureau 8 Co., Ltd. Patentee before: Capital Iron & Steel General Company |