CN104162731A - L555M pipeline steel combination welding method - Google Patents

L555M pipeline steel combination welding method Download PDF

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Publication number
CN104162731A
CN104162731A CN201410225349.5A CN201410225349A CN104162731A CN 104162731 A CN104162731 A CN 104162731A CN 201410225349 A CN201410225349 A CN 201410225349A CN 104162731 A CN104162731 A CN 104162731A
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China
Prior art keywords
silk
welding
voltage
electric current
weld
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CN201410225349.5A
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Chinese (zh)
Inventor
李志宏
于磊
沈沆
莫诚生
邹文超
姚立东
檀才保
李朋
刘亮
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ANHUI SPECIAL EQUIPMENT INSPECTION INSTITUTE
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ANHUI SPECIAL EQUIPMENT INSPECTION INSTITUTE
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Priority to CN201410225349.5A priority Critical patent/CN104162731A/en
Publication of CN104162731A publication Critical patent/CN104162731A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/18Submerged-arc welding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/16Arc welding or cutting making use of shielding gas
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/235Preliminary treatment

Abstract

The invention discloses an L555M pipeline steel combination welding method. As for domestic L555M steel plates, the JCOE forming process is adopted, the combination welding method integrating carbon-dioxide shielded welding with longitudinal submerged arc welding is used, then the procedures of diameter expansion, hydrostatic testing, nondestructive testing, chamfering and the like are executed, and finally steel tubes are formed through the steel plates. By the adoption of the combination welding method integrating carbon-dioxide shielded welding with longitudinal submerged arc welding, production efficiency is improved, product quality is also taken into consideration, meanwhile, the problem that a heat affected zone is softened is solved under high weld heat input, and performance of the finally-finished steel tubes meets all requirements of the GB/T9711-2011 standard of China.

Description

A kind of L555M pipe line steel combination welding method
Technical field
The invention belongs to welding technology field, be specifically related to a kind of L555M pipe line steel combination welding method.
Background technology
In order to carrying, to distribute, to mix, to separate, discharge, metering, the pressure pipeline of controlling and prevent fluid or gas flow determine that it needs good welding procedure because of its application scenario and carrying substance characteristics, in general welding procedure, often exist as pore, slag inclusion, incomplete fusion, lack of penetration, crackle and other weld defect, therefore providing a kind of high performance welding procedure to weld L555M steel plate, to form the pressure pipeline of high-quality most important.
Summary of the invention
The present invention is in order to obtain the L555M pipe line steel Combination Welding effect of high-quality, and the present invention proposes a kind of L555M pipe line steel combination welding method.
The technical solution adopted in the present invention is as follows:
A kind of L555M pipe line steel combination welding method, it is characterized in that: for domestic L555M steel plate, adopt JCOE moulding process, use two guarantor's welderings to add vertical masonry joint submerged-arc welding combined welding method, then by operations such as hole enlargement, the water pressure test, Non-Destructive Testing, chamfered edges, be finally steel pipe by steel plate forming.
A kind of L555M pipe line steel combination welding method, mainly comprises the following steps:
1): carry out sheet material detection; 2): for selected plate cutting, determine sheet material to be welded, complete blanking process; 3): selected blanking sheet material is carried out to milling limit and pre-bending operation; 4): on JCO forming machine first by the half of steel plate after pre-bending through repeatedly stepping punching press, be pressed into J type, then will after second half same bending of steel plate, be pressed into C type, to the last form the O shape pipe of opening; 5): then carry out welding sequence; 6): the successful product of preliminary welding is carried out to the operations such as nondestructive inspection, hole enlargement until whole welded tube production procedure finishes; 2):
Described welding sequence refers to and first adopts two guarantor's welderings to carry out joint close prewelding, steel pipe being carried out successively in submerged arc weldering and submerged arc outside weld, in the process of welding, select monofilament or multifibres technique to weld according to conditions such as thicknesss of slab, wherein be directed to L555M(PSL2 tube product) pipe line steel, specification bore 914-1016mm, wall thickness is 18-21mm, under composition and content parameter enter:
C≤0.08%,Si≤0.45%;Mn1.6-1.85%;P≤0.025%;S≤0.015%;V+Nb+Ti≤0.15%;
Cu≤0.5%, Ni≤0.5%; Cr≤0.5%; Mo≤0.5%; B≤0.004%; All the other are mainly Fe element; CE pcm≤ 0.25%; CE iI w≤ 0.43%.
Welding sequence parameter is as follows:
1. prewelding: two protect weldering, diameter phi 1.2mm; DC reverse connection; Electric current 240-280A; Voltage 26-30V;
Weld fast 1.4-1.8m/min; Gas flow rate 15-20L/min.
2. interior submerged-arc welding: double wire welding; Front silk DC reverse connection, rear silk exchanges, and is independent current source.Front and back silk spacing 16-17mm.
Front silk: φ 4.0mm, electric current 840-940A; Voltage 32-36V; Weld fast 1.15-1.20m/min;
Rear silk: φ 3.2mm, electric current 660-760A; Voltage 40-44V; Weld fast 1.15-1.20m/min.
3. outer submerged-arc welding: three wire bonds connect; Front silk DC reverse connection, in, rear silk exchanges, and is independent current source.Before in silk a spacing be 17-18mm, in after silk a spacing be 18-19mm.
Front silk: φ 4.0mm, electric current 800-900A; Voltage 32-36V; Weld fast 1.15-1.25m/min;
Middle silk: φ 4.0mm, electric current 760-860A; Voltage 36-40V; Weld fast 1.15-1.25m/min;
Rear silk: φ 3.2mm, electric current 680-760A; Voltage 38-42V; Weld fast 1.15-1.25m/min.
The present invention protects weldering in conjunction with vertical masonry joint submerged-arc welding combined method with two, improve production efficiency and taken into account product quality, under large weld heat input, effectively solved the problems such as heat affected area is softening, and final finished steel tube performance all meets all requirements of China GB/T9711-2011 standard simultaneously.
Brief description of the drawings
Fig. 1 is welding junction figure of the present invention;
Fig. 2 is welding point hardness test figure of the present invention;
Table 1.1 φ 914mm × 18.4mm steel pipe tensile property test result;
Table 1.2 φ 914mm × 18.4mm steel pipe-20 DEG C Charpy impact test result;
Table 1.3 φ 914mm × 18.4mm steel pipe is in the hardness test result of distinct interface position;
Table 2.1 φ 965mm × 19mm steel pipe tensile property test result;
Table 2.2 φ 965mm × 19mm steel pipe-20 DEG C Charpy impact test result;
Table 2.3 φ 965mm × 19mm steel pipe is in the hardness test result of distinct interface position;
Table 3.1 φ 1016mm × 21mm steel pipe tensile property test result;
Table 3.2 φ 1016mm × 21mm steel pipe-20 DEG C Charpy impact test result;
Table 3.3 φ 1016mm × 21mm steel pipe is in the hardness test result of distinct interface position.
Detailed description of the invention
A kind of L555M pipe line steel combination welding method, it is characterized in that: for domestic L555M steel plate, adopt JCOE moulding process, use two guarantor's welderings to add vertical masonry joint submerged-arc welding combined welding method, then by operations such as hole enlargement, the water pressure test, Non-Destructive Testing, chamfered edges, be finally steel pipe by steel plate forming.
A kind of L555M pipe line steel combination welding method, mainly comprises the following steps:
1): carry out sheet material detection; 2): for selected plate cutting, determine sheet material to be welded, complete blanking process; 3): selected blanking sheet material is carried out to milling limit and pre-bending operation; 4): on JCO forming machine first by the half of steel plate after pre-bending through repeatedly stepping punching press, be pressed into J type, then will after second half same bending of steel plate, be pressed into C type, to the last form the O shape pipe of opening; 5): then carry out welding sequence; 6): the successful product of preliminary welding is carried out to the operations such as nondestructive inspection, hole enlargement until whole welded tube production procedure finishes; 2):
Described welding sequence refers to and first adopts two guarantor's welderings to carry out joint close prewelding, steel pipe being carried out successively to weldering and submerged arc outside weld in submerged arc, in the process of welding, selects monofilament or multifibres technique to weld according to conditions such as thicknesss of slab.
As shown in Figure 1 be the bevel for welding figure of the present invention when the welding L555M pipe line steel, wherein 1 be prewelding, 2 is weldering in submerged-arc welding, 3 is submerged-arc welding outside weld; Adopt this welding procedure, carry out the welding fabrication work of the steel pipe of φ 914mm × 18.4mm, φ 965mm × 19mm, tri-kinds of specifications of φ 1016mm × 21mm, and carried out respectively the test of tensile property, Charpy impact and hardness, details are as follows respectively:
(1) for φ 914mm × 18.4mm steel pipe's production:
1. its chemical composition:
C=0.053%, Si=0.246%; Mn=1.75%; P=0.0098%; S=0.0016%; V=0.031%; Nb=0.047%; Ti=0.015%; Cu=0.032%, Ni=0.134%; Cr=0.022%; Mo=0.172%; B=0.0003%; All the other are Fe element; CE pcm=0.1702%.
2. welding parameter
Prewelding: gage of wire 1.2mm, electric current 260A, voltage 28V, welds fast 1.5m/min, DC reverse connection;
Interior weldering: double wire welding; Front silk DC reverse connection, rear silk exchanges.Front and back silk spacing 16mm.
Front silk: φ 4.0mm, electric current 850A; Voltage 36V; Weld fast 1.15m/min;
Rear silk: φ 3.2mm, electric current 700A; Voltage 41V; Weld fast 1.15m/min.
Outside weld: three wire bonds connect; Front silk DC reverse connection, in, rear silk exchanges.Before in a silk spacing be 17mm, in after silk spacing 18mm.
Front silk: φ 4.0mm, electric current 850A; Voltage 34V; Weld fast 1.25m/min;
Middle silk: φ 4.0mm, electric current 830A; Voltage 38V; Weld fast 1.25m/min;
Rear silk: φ 3.2mm, electric current 700A; Voltage 40V; Weld fast 1.25m/min.
Tensile property is as shown in table 1.1, and the Charpy impact-20 ° time is as shown in table 1.2, and the hardness test of diverse location interface is as shown in table 1.3;
(2) for φ 965mm × 19mm steel pipe's production:
1. chemical composition: C=0.054%, Si=0.246%; Mn=1.67%; P=0.0097%; S=0.0016%; V=0.031%; Nb=0.046%; Ti=0.016%; Cu=0.032%, Ni=0.134%; Cr=0.022%; Mo=0.170%; B=0.0003%; All the other are Fe element; CE pcm=0.165%.
2. welding parameter
Prewelding: gage of wire 1.2mm, electric current 265A, voltage 28.5V, welds fast 1.55m/min, DC reverse connection;
Interior weldering: double wire welding; Front silk DC reverse connection, rear silk exchanges.Front and back silk spacing 16.5mm.
Front silk: φ 4.0mm, electric current 880A; Voltage 35V; Weld fast 1.18m/min;
Rear silk: φ 3.2mm, electric current 720A; Voltage 40V; Weld fast 1.19m/min.
Outside weld: three wire bonds connect; Front silk DC reverse connection, in, rear silk exchanges.Before in a silk spacing be 17.5mm, in after silk spacing 18.5mm.
Front silk: φ 4.0mm, electric current 880A; Voltage 34V; Weld fast 1.18m/min;
Middle silk: φ 4.0mm, electric current 840A; Voltage 37V; Weld fast 1.20m/min;
Rear silk: φ 3.2mm, electric current 680A; Voltage 41V; Weld fast 1.20m/min.
Tensile property is as shown in table 2.1, and the Charpy impact-20 ° time is as shown in table 2.2, and the hardness test of diverse location interface is as shown in table 2.3;
(3) for φ 1016mm × 21mm steel pipe's production:
1. chemical composition: C=0.048%, Si=0.257%; Mn=1.77%; P=0.0091%; S=0.0021%; V=0.035%; Nb=0.058%; Ti=0.017%; Cu=0.028%, Ni=0.139%; Cr=0.026%; Mo=0.167%; B=0.0002%; All the other are Fe element; CE pcm=0.1657%.
2. welding parameter
Prewelding: gage of wire 1.2mm, electric current 280A, voltage 26V, welds fast 1.7m/min, DC reverse connection;
Interior weldering: double wire welding; Front silk DC reverse connection, rear silk exchanges.Front and back silk spacing 17mm.
Front silk: φ 4.0mm, electric current 920A; Voltage 33V; Weld fast 1.18m/min;
Rear silk: φ 3.2mm, electric current 760A; Voltage 41V; Weld fast 1.20m/min.
Outside weld: three wire bonds connect; Front silk DC reverse connection, in, rear silk exchanges.Before in a silk spacing be 18mm, in after silk spacing 19mm.
Front silk: φ 4.0mm, electric current 900A; Voltage 33V; Weld fast 1.20m/min;
Middle silk: φ 4.0mm, electric current 860A; Voltage 36V; Weld fast 1.20m/min;
Rear silk: φ 3.2mm, electric current 710A; Voltage 40V; Weld fast 1.20m/min.
Tensile property is as shown in table 3.1, and the Charpy impact-20 ° time is as shown in table 3.2, and the hardness test of diverse location interface is as shown in table 3.3;
Tensile property, Charpy impact and the interface hardness test of the L555M pipe line steel welding finished product by many different sizes, must adopt end properties that this technique is welded all to meet all requirements of China GB/T9711-2011 standard.
Table 1.1
Position performance R t0..5(MPa) R m(MPa) R t0.5/R m A(%)
Mother metal 589 686 0.86 31
Welding point (breaking in mother metal) ? 708 ? ?
Table 1.2
Table 1.3
1 2 3 4 5 6 7 8 9 10 11 12 13 14
202 201 205 244 238 207 223 207 207 203 251 241 213 206
Table 2.1
Position performance R t0..5(MPa) R m(MPa) R t0.5/R m A(%)
Mother metal 609 728 0.84 34
Welding point (breaking in mother metal) ? 731 ? ?
Table 2.2
Table 2.3
1 2 3 4 5 6 7 8 9 10 11 12 13 14
212 202 206 256 267 223 231 217 222 214 261 253 222 217
Table 3.1
Position performance R t0..5(MPa) R m(MPa) R t0.5/R m A(%)
Mother metal 596 715 0.83 29
Welding point (breaking in mother metal) ? 728 ? ?
Table 3.2
Table 3.3
1 2 3 4 5 6 7 8 9 10 11 12 13 14
223 198 221 272 268 215 231 221 231 218 255 256 216 219

Claims (3)

1. a L555M pipe line steel combination welding method, it is characterized in that: for domestic L555M steel plate, adopt JCOE moulding process, use two guarantor's welderings to add vertical masonry joint submerged-arc welding combined welding method, then by operations such as hole enlargement, the water pressure test, Non-Destructive Testing, chamfered edges, be finally steel pipe by L555M steel plate forming.
2. a L555M pipe line steel combination welding method, is characterized in that, mainly comprises the following steps:
1): carry out sheet material detection;
2): for selected plate cutting, determine sheet material to be welded, complete blanking process;
3): selected blanking sheet material is carried out to milling limit and pre-bending operation;
4): on JCO forming machine first by the half of steel plate after pre-bending through repeatedly stepping punching press, be pressed into J type, then will after second half same bending of steel plate, be pressed into C type, to the last form the O shape pipe of opening;
5): then carry out welding sequence;
6): the successful product of preliminary welding is carried out to the operations such as nondestructive inspection, hole enlargement until whole welded tube production procedure finishes.
3. a kind of L555M pipe line steel combination welding method according to claim 2, is characterized in that:
Described welding sequence refers to and first adopts two guarantor's welderings to carry out joint close prewelding, steel pipe being carried out successively in submerged arc weldering and submerged arc outside weld, in the process of welding, select monofilament or multifibres technique to weld according to conditions such as thicknesss of slab, wherein be directed to L555M(PSL2 tube product) pipe line steel, specification bore 914-1016mm, wall thickness is 18-21mm, welding sequence parameter is as follows:
1. prewelding: two protect weldering, diameter phi 1.2mm; DC reverse connection; Electric current 240-280A; Voltage 26-30V;
Weld fast 1.4-1.8m/min; Gas flow rate 15-20L/min;
2. interior submerged-arc welding: double wire welding; Front silk DC reverse connection, rear silk exchanges, and is independent current source;
Front and back silk spacing 16-17mm;
Front silk: φ 4.0mm, electric current 840-940A; Voltage 32-36V; Weld fast 1.15-1.20m/min;
Rear silk: φ 3.2mm, electric current 660-760A; Voltage 40-44V; Weld fast 1.15-1.20m/min;
3. outer submerged-arc welding: three wire bonds connect; Front silk DC reverse connection, in, rear silk exchanges, and is independent current source;
Before in silk a spacing be 17-18mm, in after silk a spacing be 18-19mm;
Front silk: φ 4.0mm, electric current 800-900A; Voltage 32-36V; Weld fast 1.15-1.25m/min;
Middle silk: φ 4.0mm, electric current 760-860A; Voltage 36-40V; Weld fast 1.15-1.25m/min;
Rear silk: φ 3.2mm, electric current 680-760A; Voltage 38-42V; Weld fast 1.15-1.25m/min.
CN201410225349.5A 2014-05-24 2014-05-24 L555M pipeline steel combination welding method Pending CN104162731A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105171208A (en) * 2015-10-22 2015-12-23 中国石油集团渤海石油装备制造有限公司 Prewelding method of thin-wall longitudinal submerged-arc welded (LSAW) pipes with small bore diameter
CN106425049A (en) * 2016-12-06 2017-02-22 武汉天高熔接股份有限公司 Submerged-arc welding deep penetration single-side welding technology of thick plates
CN107081508A (en) * 2017-06-08 2017-08-22 武汉钢铁有限公司 Thickness connects method in the double wire hidden arc welding of the 15 20mm ultrafast cold X70 steel of high-performance
CN107813036A (en) * 2016-09-13 2018-03-20 张盘 A kind of two-sided single track buried arc welding method of cut deal mariages

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CN101205596A (en) * 2007-12-10 2008-06-25 华北石油管理局第一机械厂 X120 pipeline steel submerged arc straight weld pipe and manufacture technique thereof
CN103194678A (en) * 2013-03-26 2013-07-10 宝山钢铁股份有限公司 UOE welded tube and manufacturing method thereof
CN103240512A (en) * 2013-05-13 2013-08-14 中国石油集团渤海石油装备制造有限公司 Welding technology for K65 low-temperature-resistant hot bend pipe mains
CN103521550A (en) * 2013-10-07 2014-01-22 宝鸡石油钢管有限责任公司 Manufacturing method of X90 grade pipeline steel large-opening-diameter thick-wall longitudinal submerged-arc welded pipe
CN103521549A (en) * 2013-10-07 2014-01-22 宝鸡石油钢管有限责任公司 Manufacturing method of X100 high-steel-grade large-opening-diameter thick-wall longitudinal submerged-arc welded pipe
JP2014018816A (en) * 2012-07-17 2014-02-03 Jfe Steel Corp Welded steel pipe and method of manufacturing the same
CN103722346A (en) * 2013-12-25 2014-04-16 江苏玉龙钢管股份有限公司 Corrosion-resistant metallurgical composite bimetal longitudinal submerged-arc welded steel pipe and method for manufacturing same
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Publication number Priority date Publication date Assignee Title
CN101205596A (en) * 2007-12-10 2008-06-25 华北石油管理局第一机械厂 X120 pipeline steel submerged arc straight weld pipe and manufacture technique thereof
JP2014018816A (en) * 2012-07-17 2014-02-03 Jfe Steel Corp Welded steel pipe and method of manufacturing the same
CN103194678A (en) * 2013-03-26 2013-07-10 宝山钢铁股份有限公司 UOE welded tube and manufacturing method thereof
CN103240512A (en) * 2013-05-13 2013-08-14 中国石油集团渤海石油装备制造有限公司 Welding technology for K65 low-temperature-resistant hot bend pipe mains
CN103521550A (en) * 2013-10-07 2014-01-22 宝鸡石油钢管有限责任公司 Manufacturing method of X90 grade pipeline steel large-opening-diameter thick-wall longitudinal submerged-arc welded pipe
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CN103722346A (en) * 2013-12-25 2014-04-16 江苏玉龙钢管股份有限公司 Corrosion-resistant metallurgical composite bimetal longitudinal submerged-arc welded steel pipe and method for manufacturing same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105171208A (en) * 2015-10-22 2015-12-23 中国石油集团渤海石油装备制造有限公司 Prewelding method of thin-wall longitudinal submerged-arc welded (LSAW) pipes with small bore diameter
CN107813036A (en) * 2016-09-13 2018-03-20 张盘 A kind of two-sided single track buried arc welding method of cut deal mariages
CN106425049A (en) * 2016-12-06 2017-02-22 武汉天高熔接股份有限公司 Submerged-arc welding deep penetration single-side welding technology of thick plates
CN107081508A (en) * 2017-06-08 2017-08-22 武汉钢铁有限公司 Thickness connects method in the double wire hidden arc welding of the 15 20mm ultrafast cold X70 steel of high-performance

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