CN106041309A - A kind of welding method of Q420 high strength steel - Google Patents
A kind of welding method of Q420 high strength steel Download PDFInfo
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- CN106041309A CN106041309A CN201510175205.8A CN201510175205A CN106041309A CN 106041309 A CN106041309 A CN 106041309A CN 201510175205 A CN201510175205 A CN 201510175205A CN 106041309 A CN106041309 A CN 106041309A
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Abstract
The present invention provides a kind of weld strength high, and the welding method the method meeting the Q420 high strength steel that stretching requires with impact test is, cuts Q420 high strength steel, forms butt welding groove on two pieces of high strength steels to be welded；Described groove includes that the upper groove of opposite face angle at 45 ° of two pieces of high-strength steel sheets, the parallel middle groove of opposite face of two pieces of high-strength steel sheets, the opposite face of two pieces of high-strength steel sheets become the lower groove of 60 ° of angles；The bottom using line double wire hidden arc welding elder generation's centering groove and upper groove carries out first welding, upper groove top carries out second welding, and lower groove finally carries out the 3rd road welding；Electric current 620-750A during welding, voltage 28-32V, speed of welding 30-42cm/min.
Description
Technical field
The present invention relates to the welding method of high strength steel, specifically, be the welding method of Q420 high strength steel.
Background technology
In order to prepare the box-section crane girder of super large loading capacity, need to use Q420 high strength steel to weld.But crane girder welding box-shaped for Q420 is domestic rarely has precedent, it is desirable to weld seam is first-order weld, and ultrasonic examination 100% is qualified, need to meet Z35 performance requirement simultaneously.
Summary of the invention
It is an object of the invention to provide the welding method of a kind of Q420 high strength steel, weld Q420 steel according to the method, weld strength is high, meets stretching and impact test requirement.
The welding method of Q420 high strength steel of the present invention, including: step a: cutting Q420 high strength steel, two pieces of high strength steels to be welded are formed butt welding groove；Described groove includes that the upper groove of opposite face angle at 45 ° of two pieces of high-strength steel sheets, the parallel middle groove of opposite face of two pieces of high-strength steel sheets, the opposite face of two pieces of high-strength steel sheets become the lower groove of 60 ° of angles；
Step b: use the bottom of line double wire hidden arc welding elder generation's centering groove and upper groove to carry out first welding, upper groove top carries out second welding, finally carries out the 3rd road welding to lower groove；Electric current 620-750A during welding, voltage 28-32V, speed of welding 30-42cm/min.
Above-mentioned welding method, is preheated to 30-40 DEG C to high strength steel to be welded before welding, temperature 30-40 DEG C between road, uses asbestic blanket to cover weld seam insulation so that weld seam gradually Slow cooling after welding.
Above-mentioned welding method, during welding, welding wire uses the H10Mn2A of a diameter of 4mm, and solder flux uses SJ101.
Above-mentioned welding method, high strength steel thickness to be welded is 25mm, and upper groove, middle groove, the height of lower groove are respectively 15mm, 3mm, 7mm.
Above-mentioned welding method, welding machine is MZ-1000/DZ7.
Above-mentioned welding method, uses cut during cutting Q420 high strength steel.
The welding method of the Q420 high strength steel that the present invention provides, uses the slope type with lower groove, it is ensured that weld seam through welding, and molten bath is difficult to puncture, it is to avoid the defects such as weld seam generation incomplete fusion crackle occur, and the stress effectively reducing weld seam is concentrated；Electric current 620-750A during welding, voltage 28-32V, speed of welding 30-42cm/min, can accurately control arc energy and distribution thereof, reduce the impact of weldment heat accumulation, it is easy to obtaining uniform fusion penetration and even weld penetration, weld seam is careful, fall stress concentration, it is achieved improve the welding quality of Q420 high strength steel.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the groove schematic diagram of Q420 high strength steel of the present invention welding.
Fig. 2 is the weld path schematic diagrams of Q420 high strength steel of the present invention welding.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.
Cut Q420B high strength steel, is formation butt welding groove on the high strength steel of 25mm at two pieces of thickness to be welded；Described groove includes that the upper groove of opposite face angle at 45 ° of two pieces of high-strength steel sheets, the parallel middle groove of opposite face of two pieces of high-strength steel sheets, the opposite face of two pieces of high-strength steel sheets become the lower groove of 60 ° of angles, and upper groove, middle groove, the height of lower groove are respectively 15mm, 3mm, 7mm.
Before welding, the groove to two pieces of high strength steels to be welded is preheated to 30-40 DEG C, use Lincoln weld welding machine (model is MZ-1000/DZ7), electric power polarity uses DC reverse connection, welding wire uses the H10Mn2A of a diameter of 4mm, solder flux uses SJ101, uses line double wire hidden arc welding method, the bottom of first centering groove and upper groove to carry out first welding (welding bead 1), upper groove top is carried out second welding (welding bead 2) again, finally lower groove is carried out the 3rd road welding (welding bead 3)；Electric current 620-750A during welding, voltage 28-32V, speed of welding 30-42cm/min.Temperature 30-40 DEG C between road, after welding, uses asbestic blanket to cover weld seam insulation so that weld seam gradually Slow cooling.Welding ambient temperature :-2.5 ~ 7 DEG C, humidity 60%.Solder flux SJ101 bakees 120min before using at 350 DEG C.
After welding, testing test according to " welding for steel structure specification " GB50661-2011, x-ray detection reaches one-level, and tension test intensity Rm reaches 629-633MPa, carries out impact test at 20 DEG C, and Impact energy Ak v reaches 180-204J.
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit；Although the present invention being described in detail with reference to previous embodiment, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein portion of techniques feature is carried out equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (4)
1. the welding method of a Q420 high strength steel, it is characterised in that including: step a: cutting Q420 high strength steel, forms butt welding groove on two pieces of high strength steels to be welded；Described groove includes that the upper groove of opposite face angle at 45 ° of two pieces of high-strength steel sheets, the parallel middle groove of opposite face of two pieces of high-strength steel sheets, the opposite face of two pieces of high-strength steel sheets become the lower groove of 60 ° of angles；
Step b: use the bottom of line double wire hidden arc welding elder generation's centering groove and upper groove to carry out first welding, upper groove top carries out second welding, finally carries out the 3rd road welding to lower groove；Electric current 620-750A during welding, voltage 28-32V, speed of welding 30-42cm/min.
2. welding method as claimed in claim 1, is characterized in that: before Han Jie, high strength steel to be welded is preheated to 30-40 DEG C, temperature 30-40 DEG C between road, uses asbestic blanket to cover weld seam insulation so that weld seam gradually Slow cooling after welding.
3. welding method as claimed in claim 1, is characterized in that: during welding, welding wire uses the H10Mn2A of a diameter of 4mm, solder flux uses SJ101.
4. welding method as claimed in claim 1, is characterized in that: high strength steel thickness to be welded is 25mm, and upper groove, middle groove, the height of lower groove are respectively 15mm, 3mm, 7mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510175205.8A CN106041309A (en) | 2015-04-14 | 2015-04-14 | A kind of welding method of Q420 high strength steel |
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| CN201510175205.8A CN106041309A (en) | 2015-04-14 | 2015-04-14 | A kind of welding method of Q420 high strength steel |
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| CN106041309A true CN106041309A (en) | 2016-10-26 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108856992A (en) * | 2018-08-15 | 2018-11-23 | 招商局重工（江苏）有限公司 | A kind of high heat-input double wire hidden arc welding high-efficiency welding method |
| CN109967840A (en) * | 2019-04-17 | 2019-07-05 | 江阴兴澄特种钢铁有限公司 | A kind of high-strength building structural steel Q420GJD welding technology of automatic submerged-arc welding |
| CN109967839A (en) * | 2019-04-17 | 2019-07-05 | 江阴兴澄特种钢铁有限公司 | A kind of high-strength building structural steel Q460GJD welding technology of automatic submerged-arc welding |
| CN110640279A (en) * | 2019-09-30 | 2020-01-03 | 广州黄船海洋工程有限公司 | Welding flux copper gasket method submerged-arc welding process for Q420 high-strength steel thick plate |
| CN111545878A (en) * | 2020-05-18 | 2020-08-18 | 中国二十二冶集团有限公司 | Submerged arc welding method for Q460GJD steel of large-thickness building structure |
| CN113369675A (en) * | 2021-07-12 | 2021-09-10 | 中车唐山机车车辆有限公司 | Carriage processing method, carriage and vehicle |
| CN114682886A (en) * | 2022-04-28 | 2022-07-01 | 河南鼎力杆塔股份有限公司 | Welding method for angle iron tower steel cladding |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108856992A (en) * | 2018-08-15 | 2018-11-23 | 招商局重工（江苏）有限公司 | A kind of high heat-input double wire hidden arc welding high-efficiency welding method |
| CN109967840A (en) * | 2019-04-17 | 2019-07-05 | 江阴兴澄特种钢铁有限公司 | A kind of high-strength building structural steel Q420GJD welding technology of automatic submerged-arc welding |
| CN109967839A (en) * | 2019-04-17 | 2019-07-05 | 江阴兴澄特种钢铁有限公司 | A kind of high-strength building structural steel Q460GJD welding technology of automatic submerged-arc welding |
| CN110640279A (en) * | 2019-09-30 | 2020-01-03 | 广州黄船海洋工程有限公司 | Welding flux copper gasket method submerged-arc welding process for Q420 high-strength steel thick plate |
| CN110640279B (en) * | 2019-09-30 | 2021-10-26 | 广州黄船海洋工程有限公司 | Welding flux copper gasket method submerged-arc welding process for Q420 high-strength steel thick plate |
| CN111545878A (en) * | 2020-05-18 | 2020-08-18 | 中国二十二冶集团有限公司 | Submerged arc welding method for Q460GJD steel of large-thickness building structure |
| CN113369675A (en) * | 2021-07-12 | 2021-09-10 | 中车唐山机车车辆有限公司 | Carriage processing method, carriage and vehicle |
| CN114682886A (en) * | 2022-04-28 | 2022-07-01 | 河南鼎力杆塔股份有限公司 | Welding method for angle iron tower steel cladding |
| CN114682886B (en) * | 2022-04-28 | 2024-03-19 | 河南鼎力杆塔股份有限公司 | Welding method for angle iron tower steel |
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Application publication date: 20161026 |