CN104801838A - Welding technology for thick steel plate - Google Patents
Welding technology for thick steel plate Download PDFInfo
- Publication number
- CN104801838A CN104801838A CN201510252665.6A CN201510252665A CN104801838A CN 104801838 A CN104801838 A CN 104801838A CN 201510252665 A CN201510252665 A CN 201510252665A CN 104801838 A CN104801838 A CN 104801838A
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- welding
- steel plate
- welding procedure
- procedure
- weld
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
- B23K9/186—Submerged-arc welding making use of a consumable electrodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention provides a welding technology for a thick steel plate. The steel plate is made from Q690E steel and is 30-60mm in thickness. The welding technology comprises the following steps: preheating the steel plate before welding; during welding, inputting lower welding heat capable of controlling t8/5 to be smaller than 30s to ensure that a tissue which takes a small-grain lath martensite as a main body can be obtained in a heat influence region. Meanwhile, during welding, a multi-layer multi-channel welding technology is adopted. According to the welding technology, the defects in the prior art can be overcome, and a welding joint is excellent in mechanical property.
Description
Technical field
The present invention relates to Plate Welding technical field, specifically, the present invention relates to a kind of welding procedure of steel plate.
Background technology
Conventional hoist can not meet the special operation condition requirement in ocean development field in a lot, in view of the advantage of jib crane uniqueness, increasing client both at home and abroad starts to select jib crane, especially in the application of oil platform, pipe laying barge, obtain good embodiment, prospect is very wide.
There is no good interface unit between the reversing chassis of existing jib crane and hull, therefore docking situation is between the two very not satisfactory.
And in the process manufacturing better interface unit, according to Q690E steel, then existing welding procedure for steel plate thickness thinner often, not for the improved welding technique of relatively thick steel plate, this causes certain obstacle to production process.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of welding procedure of steel plate, can make up deficiency of the prior art, and welding point obtains satisfied mechanical property.
For solving the problems of the technologies described above, the invention provides a kind of welding procedure of steel plate, described steel plate is Q690E steel, and the thickness of described steel plate is 30 ~ 60mm; Described welding procedure comprises: carry out weld preheating to described steel plate; Adopting when welding can control t
8/5be less than the less thermal weld stress of 30s, guarantee that heat affected area obtains based on the tissue of the tiny lath martensite of crystal grain.
Alternatively, multi-layer multi-pass welding process is adopted when welding.
Alternatively, the welding wire of described welding procedure is 3NiCrMo-2.5up welding wire for submerged-arc welding.
Alternatively, the temperature of described weld preheating controls to be 150 ~ 200 DEG C.
Alternatively, when welding, weld heat input controls is 1.5 ~ 1.71KJ/mm.
Alternatively, after welding, Welded Joints is incubated 1.5 ~ 2h at 220 ~ 240 DEG C.
Compared with prior art, the present invention has the following advantages:
The present invention adopts Q690E high-strength steel plate welding procedure in a large number at jib crane complete machine (interface unit especially between complete machine structure and Ship Structure).Because Q690E steel has very strong tendency of hardenability, be cooled to the time t of 500 DEG C from 800 DEG C by molten bath after control welding
8/5< 30s, can guarantee the toughness of heat affected area.During the welding of Q690E steel, preheat temperature controls at 150 ~ 200 DEG C, and weld heat input controls at about 1.5 ~ 1.7kJ/mm, coordinates rational ultralow hydrogen type welding material, can obtain desirable welding point.
Accompanying drawing explanation
The above and other features of the present invention, character and advantage become more obvious by passing through below in conjunction with the description of drawings and Examples, wherein:
Fig. 1 is low-temperature flexibility impact absorbing energy J under each peak temperature condition of the prior art
αwith weld after molten bath to be cooled to the time t of 500 DEG C from 800 DEG C
8/5graph of relation;
Fig. 2 is the result of the test table of the mechanical property of welding point after the welding procedure of the steel plate of one embodiment of the invention performs.
Detailed description of the invention
Below in conjunction with specific embodiments and the drawings, the invention will be further described; set forth more details in the following description so that fully understand the present invention; but the present invention obviously can implement with multiple this alternate manner described that is different from; those skilled in the art when doing similar popularization, deduction without prejudice to when intension of the present invention according to practical situations, therefore should can not limit the scope of the invention with the content of this specific embodiment.
Fig. 1 is low-temperature flexibility impact absorbing energy J under each peak temperature condition of the prior art
αwith weld after molten bath to be cooled to the time t of 500 DEG C from 800 DEG C
8/5graph of relation.Q690E steel belongs to low-alloy high-strength steel, has the main features such as fire check, cold crack, tendency of hardenability and hydrogen induced cracking sensitiveness, particularly there is the embrittlement issue of heat affected area (Heat Affected Zone, HAZ) during welding.According to Ceq formula, known Q690E weldability is poor, has serious tendency of hardenability and cold crack tendency, namely during welding
Ceq＝C+(Mn+Si)/6+(Cr+Mo+V)+(Cu+Ni)/15＝0.48
Therefore, answer preheating before the welding of Q690E steel, weld the higher thermal weld stress of appropriate to the occasion employing to reduce cooling velocity.But find when actual welding, be often difficult to avoid martensitic formation by means of only increasing thermal weld stress, it is austenitic overheated to increase on the contrary, promotes the formation of massive martensite and upper bainite, makes the embrittlement of heat affected area even more serious.Therefore, prevent the technique of heat affected zone embrittlement mainly by preheating and slow cooling measure in the present invention.
Specifically, in one embodiment of the invention, this steel plate is Q690E steel, and its thickness is 30 ~ 60mm.The welding procedure of steel plate comprises: carry out weld preheating to this steel plate; Adopting when welding can control t
8/5be less than the less thermal weld stress of 30s, guarantee that heat affected area (HAZ) obtains based on the tissue of the tiny lath martensite of crystal grain.Meanwhile, adopt multi-layer multi-pass welding process again when welding, then can obtain desirable welding point.
According to above-mentioned technique, select 3NiCrMo-2.5up welding wire for submerged-arc welding as the welding wire of welding procedure in one embodiment of the present of invention, it is thick that the steel plate thickness of Q690E steel is exemplarily decided to be 36mm, this has been weldability test.In process of the test, the temperature of this weld preheating may be controlled to 150 ~ 200 DEG C, and weld heat input may be controlled to 1.5 ~ 1.71KJ/mm when welding.Meanwhile, multi-layer multi-pass welding process is adopted when welding.After welding, Welded Joints is incubated 1.5 ~ 2h in the environment of 220 ~ 240 DEG C.
Fig. 2 is the result of the test table of the mechanical property of welding point after the welding procedure of the steel plate of one embodiment of the invention performs.As shown in Fig. 2 or following table 1, known by above-mentioned test, when the welding parameter adopting afore-mentioned test used, every result all meets the demands.
The mechanical property of table 1 welding point
In sum, the present invention adopts Q690E high-strength steel plate welding procedure in a large number at jib crane complete machine (interface unit especially between complete machine structure and Ship Structure).Because Q690E steel has very strong tendency of hardenability, be cooled to the time t of 500 DEG C from 800 DEG C by molten bath after control welding
8/5< 30s, can guarantee the toughness of heat affected area.During the welding of Q690E steel, preheat temperature controls at 150 ~ 200 DEG C, and weld heat input controls at about 1.5 ~ 1.7KJ/mm, coordinates rational ultralow hydrogen type welding material, can obtain desirable welding point.
Although the present invention with preferred embodiment openly as above, it is not that any those skilled in the art without departing from the spirit and scope of the present invention, can make possible variation and amendment for limiting the present invention.
Therefore, every content not departing from technical solution of the present invention, any amendment done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all fall within protection domain that the claims in the present invention define.
Claims (6)
1. a welding procedure for steel plate, described steel plate is Q690E steel, and the thickness of described steel plate is 30 ~ 60mm; Described welding procedure comprises: carry out weld preheating to described steel plate; Adopting when welding can control t
8/5be less than the less thermal weld stress of 30s, guarantee that heat affected area obtains based on the tissue of the tiny lath martensite of crystal grain.
2. the welding procedure of steel plate according to claim 1, is characterized in that, adopts multi-layer multi-pass welding process when welding.
3. the welding procedure of steel plate according to claim 2, is characterized in that, the welding wire of described welding procedure is 3NiCrMo-2.5up welding wire for submerged-arc welding.
4. the welding procedure of steel plate according to claim 3, is characterized in that, the temperature of described weld preheating controls to be 150 ~ 200 DEG C.
5. the welding procedure of steel plate according to claim 4, is characterized in that, when welding, weld heat input controls is 1.5 ~ 1.71KJ/mm.
6. the welding procedure of steel plate according to claim 5, is characterized in that, after welding, Welded Joints is at 220 ~ 240 DEG C of insulation 1.5 ~ 2h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510252665.6A CN104801838A (en) | 2015-05-18 | 2015-05-18 | Welding technology for thick steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510252665.6A CN104801838A (en) | 2015-05-18 | 2015-05-18 | Welding technology for thick steel plate |
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| Publication Number | Publication Date |
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| CN104801838A true CN104801838A (en) | 2015-07-29 |
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| CN201510252665.6A Pending CN104801838A (en) | 2015-05-18 | 2015-05-18 | Welding technology for thick steel plate |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58187294A (en) * | 1982-04-26 | 1983-11-01 | Mitsubishi Heavy Ind Ltd | Welding method |
| CN102275042A (en) * | 2010-06-08 | 2011-12-14 | 上海振华重工(集团)股份有限公司 | Process for welding high-strength steel |
| CN103447670A (en) * | 2013-09-03 | 2013-12-18 | 上海振华重工(集团)股份有限公司 | Twin-wire MAG (Metal Active Gas Arc Welding) process method of high-strength steel |
| CN104520060A (en) * | 2012-06-05 | 2015-04-15 | 阿尔斯通再生能源技术公司 | Method for welding two edges of one or more steel parts to each other including heat treatment step after the welding step: penstock obtained with such method |
-
2015
- 2015-05-18 CN CN201510252665.6A patent/CN104801838A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58187294A (en) * | 1982-04-26 | 1983-11-01 | Mitsubishi Heavy Ind Ltd | Welding method |
| CN102275042A (en) * | 2010-06-08 | 2011-12-14 | 上海振华重工(集团)股份有限公司 | Process for welding high-strength steel |
| CN104520060A (en) * | 2012-06-05 | 2015-04-15 | 阿尔斯通再生能源技术公司 | Method for welding two edges of one or more steel parts to each other including heat treatment step after the welding step: penstock obtained with such method |
| CN103447670A (en) * | 2013-09-03 | 2013-12-18 | 上海振华重工(集团)股份有限公司 | Twin-wire MAG (Metal Active Gas Arc Welding) process method of high-strength steel |
Non-Patent Citations (2)
| Title |
|---|
| 沈大明: "海洋工程产品国产焊材的应用及焊接研究", 《金属加工（热处理）》 * |
| 陈玉喜: "焊接热输入对低合金高强钢焊缝组织和韧性的影响", 《上海交通大学学报》 * |
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Application publication date: 20150729 |
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