CN102601497A - Welding method for fine-grain low-alloy high-strength steel - Google Patents
Welding method for fine-grain low-alloy high-strength steel Download PDFInfo
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- CN102601497A CN102601497A CN2011100254983A CN201110025498A CN102601497A CN 102601497 A CN102601497 A CN 102601497A CN 2011100254983 A CN2011100254983 A CN 2011100254983A CN 201110025498 A CN201110025498 A CN 201110025498A CN 102601497 A CN102601497 A CN 102601497A
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Abstract
The invention relates to a welding method for steel. The welding method for the fine-grain low-alloy high-strength steel comprises the following steps that: 1. mixed protection gas including 80% of Ar and 20% of CO2 as well as an ER50-6(GB) welding wire are selected; 2. welding is carried out under the conditions that the energy of the welding wire is controlled to be 6.8-14.8kJ/cm, and the interpass temperature of welding beads is controlled to be 100-200 DEG C; and 3. air cooling is carried out after the welding, and the ER50-6(GB) welding wire includes the chemical components of: C: 0.06-0.15, Mn: 1.40-1.85, Si: 0.80-1.15, P: less than and equal to 0.025 and S: less than and equal to 0.035. According to the welding method, the toughness and the plasticity of a welding joint can be improved, particularly, the impact toughness, the coefficient of elongation and the like can be greatly improved, so as to ensure the comprehensive mechanical property and lower the welding material cost and the manufacturing cost; in addition, the requirement of the welding process is extremely simple.
Description
Technical field
The present invention relates to the welding method of steel, relate in particular to the welding method of fine grain Hi-Stren steel.
Background technology
The fine grain Hi-Stren steel (QSTE700TM) of Yield strength 700 MPa grade is used for refitted car chassis special longitudinal beam structure; Be design and the trial of carrying out according to special-purpose vehicle lightweight, reduction of discharging synergy, requirements of green environmental protection; Because the use particularity of product; Economy to mechanical performance such as the intensity of welding point, toughness, plasticity, fatigue behaviour and product has higher designing requirement, and therefore the solderability researchs such as performance of the coupling of the welding method of this fine grain Hi-Stren steel material, welding material, welding point are the emphasis of welding circle concern always.
Technical scheme and correlation technique patent from disclosed same intensity grade high-strength steel gas shielded arc welding; Welding to the fine grain, high strength degree steel of controlling the Yield strength 700 MPa grade that cold empty mutual aid system devised for poor peasants skill produces; Have two kinds of welding wire matching ways: wait strong coupling and low strong coupling, its medium strong coupling adopts the welding wire of tensile strength 800MPa, and the intensity of postwelding weld seam is enough; But higher because of welding cost, therefore influenced promoting the use of of this steel grade to a certain extent; Then study less for low strong coupling; Some document only be from the direction simple analysis such as mechanical property of weld seam metallographic structure, weld seam the welding quality of the same level high-strength steel under a kind of welding procedure; Input is not carried out deep introduction to the influence of welding quality to sweating heat, and is less to the directive significance of actual production.
Summary of the invention
The object of the present invention is to provide a kind of welding method of fine grain Hi-Stren steel; This welding method can improve the toughness and the plasticity of welding point; Particularly impact flexibility, percentage elongation etc. are greatly improved; Guarantee comprehensive mechanical performance, can reduce welding material and manufacturing cost again, and it is extremely simple to weld range request.
To achieve these goals, the present invention adopts following technical scheme:
A kind of welding method of fine grain Hi-Stren steel comprises the steps:
The first step, select Ar80%+CO for use
220% mixed protective gas and ER50-6 (GB) welding wire;
Second the step, weld heat input is controlled at 6.8---14.8kJ/cm, welding bead interlayer temperature are controlled at 100-200oC and weld;
The 3rd step, welding back air cooling;
The chemical composition of said ER50-6 (GB) welding wire is: C:0.06-0.15, and Mn:1.40-1.85, Si:0.80-1.15, P :≤0.025, S≤0.035.
Said second step is: weld heat input is controlled at 6.8---9.8kJ/cm.
The present invention adopts Ar80%+CO
220% mixed protective gas weldering; Welding material is selected the welding of ER50-6 (GB) welding wire for use by the principle of low strong coupling; Can improve the toughness and the plasticity of welding point, particularly impact flexibility, percentage elongation etc. are greatly improved, and guarantee comprehensive mechanical performance; Can reduce welding material and manufacturing cost again, and it is extremely simple to weld range request.
After welding QSTE700TM fine grain, high strength degree steel through mixed gas shielded arc welding of the present invention; Take the low strong coupling of welding wire to obtain good welding quality with the mode that less sweating heat input combines; And under the prerequisite that guarantees welding quality, reduced cost, obtained good economic benefit.
Description of drawings
Fig. 1 impacts toughness test v-notch position view for weld seam summer ratio;
Among the figure: I, II, III are respectively the position of Charpy bar v-notch, and wherein I is that weld(ing) deposit district in the Welding Structure, II are that coarse grain zone, III in the welding heat affected zone in the Welding Structure (HAZ) is the annealed zone in the welding heat affected zone in the Welding Structure (HAZ).
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described further.
A kind of welding method of fine grain Hi-Stren steel comprises the steps:
The first step, select Ar80%+CO for use
220% mixed protective gas and ER50-6 (GB) welding wire; The chemical composition of said ER50-6 (GB) welding wire is: C:0.06-0.15, and Mn:1.40-1.85, Si:0.80-1.15, P :≤0.025, S≤0.035;
Second step, weld heat input being controlled at 6.8---14.8kJ/cm, welding bead interlayer temperature are controlled at 100oC, 150oC, 200oC and weld, and totally 9 embodiment are referring to table 1;
The 3rd step, welding back air cooling.
Table 19 embodiment Welding Structures tensile strength and impact ductility test result
Through to welding the back weld seam summer than impacting toughness test, as shown in Figure 1, obtain 9 embodiment Welding Structure tensile strength and impact ductility test result, referring to table 1.
Adopt Ar80%+CO
220% mixed protective gas weldering; Welding material is selected the welding of ER50-6 (GB) welding wire for use by the principle of low strong coupling; Can improve the toughness and the plasticity of welding point, particularly impact flexibility, percentage elongation etc. are greatly improved, and guarantee comprehensive mechanical performance; Can reduce welding material and manufacturing cost again, and it is extremely simple to weld range request.
During concrete the welding; Owing to be to adopt conventional multilayer welding method; In the heat affected area, can inevitably have brittle zone and softened zone, and the special-purpose vehicle crossbeam wing plate and the web thickness of H type structure are generally 5---10mm, welding point adopts multilayer welding; The fillet weld size of angle welding is bigger, and crystal grain is thick and ruckbildung is obvious in the welding heat affected zone.So the welding heat affected zone performance test to QSTE700TM shows,, just can effectively reduce fragility and ruckbildung when the sweating heat input is controlled at 14.8kJ/cm when following.
Find out from weld metal stretching and welding point low-temperature impact test result; When heat input is controlled at 6.8-9.8kJ/cm; Weld metal intensity remains on the higher level; Welding point and heat affected area impact property are better, and when weld heat input reached the 14.8kJ/cm left and right sides, the intensity and the impact flexibility of weld metal and welding heat affected zone obviously descended.
More than being merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention, therefore, all any modifications of within spirit of the present invention and principle, being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. the welding method of a fine grain Hi-Stren steel is characterized in that: comprise the steps:
The first step, select Ar80%+CO for use
220% mixed protective gas and ER50-6 (GB) welding wire;
Second the step, weld heat input is controlled at 6.8---14.8kJ/cm, welding bead interlayer temperature are controlled at 100-200oC and weld;
The 3rd step, welding back air cooling;
The chemical composition of said ER50-6 (GB) welding wire is: C:0.06-0.15, and Mn:1.40-1.85, Si:0.80-1.15, P :≤0.025, S≤0.035.
2. the welding method of fine grain Hi-Stren steel according to claim 1 is characterized in that: said second step is: weld heat input is controlled at 6.8---9.8kJ/cm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105290572A (en) * | 2015-12-10 | 2016-02-03 | 山东钢铁股份有限公司 | Welding method for ultrahigh-strength steel |
Citations (6)
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| JP3351140B2 (en) * | 1994-12-08 | 2002-11-25 | 住友金属工業株式会社 | Welding method for low alloy high strength steel |
| CN1974101A (en) * | 2006-12-19 | 2007-06-06 | 郑州煤矿机械集团有限责任公司 | Method of welding low alloy high strength steel |
| CN101020279A (en) * | 2007-03-30 | 2007-08-22 | 沈阳航空工业学院 | Gas protected welding wire in 600 MPa level |
| US20080199346A1 (en) * | 2007-02-19 | 2008-08-21 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Weld metal of high-strength cr-mo steel |
| CN101259562A (en) * | 2008-03-20 | 2008-09-10 | 浙江盛达铁塔有限公司 | Welding technique for rolled steel |
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| JP3351140B2 (en) * | 1994-12-08 | 2002-11-25 | 住友金属工業株式会社 | Welding method for low alloy high strength steel |
| CN1974101A (en) * | 2006-12-19 | 2007-06-06 | 郑州煤矿机械集团有限责任公司 | Method of welding low alloy high strength steel |
| US20080199346A1 (en) * | 2007-02-19 | 2008-08-21 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Weld metal of high-strength cr-mo steel |
| CN101020279A (en) * | 2007-03-30 | 2007-08-22 | 沈阳航空工业学院 | Gas protected welding wire in 600 MPa level |
| CN101337298A (en) * | 2007-07-05 | 2009-01-07 | 四川神坤装备股份有限公司 | Low-alloy high-strength steel welding process |
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| 屈金山等: "Domex700MC钢焊接接头的微动磨损性能", 《机械工程材料》, vol. 33, no. 7, 31 July 2009 (2009-07-31) * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105290572A (en) * | 2015-12-10 | 2016-02-03 | 山东钢铁股份有限公司 | Welding method for ultrahigh-strength steel |
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Application publication date: 20120725 |