CN103323572A - A test method for studying components and properties of submerged-arc welding seams - Google Patents
A test method for studying components and properties of submerged-arc welding seams Download PDFInfo
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- CN103323572A CN103323572A CN2013102007299A CN201310200729A CN103323572A CN 103323572 A CN103323572 A CN 103323572A CN 2013102007299 A CN2013102007299 A CN 2013102007299A CN 201310200729 A CN201310200729 A CN 201310200729A CN 103323572 A CN103323572 A CN 103323572A
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Abstract
The invention relates to a test method for studying components and properties of submerged-arc welding seams. The test method comprises a step of preparing a test substrate; a step of welding two seams on two positions respectively by using common or coupling welding wires, wherein the two positions are respectively disposed on the front and back of the test substrate and are opposite to each other, the deviation value of the seams at the front and back of the test substrate is kept to be not more than 0.05 mm, and the overlap value of the seams is kept to be 2.0-3.0 mm; and a step of performing examination and analysis studies on the seams according to common practice. Compared with an approach of studying by developing new welding wires, the test method provided by the invention is advantageous in that components and structures of the welding seams change with components of the test substrate; test results of structure properties of the welding seams are reliable; no special equipment is needed; test results of verification tests of the welding seams about components, strength, hardness, impact toughness, etc. are reasonable; and making welding wires for submerged-arc welding is not required, thereby preventing a problem of difficulty in making welding wires for submerged-arc welding, and the test method is convenient and economical. The test method provided by the invention has very important guiding significance for developing welding wires for submerged-arc welding.
Description
Technical field
The present invention relates to a kind of welding research process, belong to particularly the test method for research submerged arc weld composition and performance.
Background technology
Welding invariably accompanies new steel grade and constantly carries out exploratory development.At present, aspect the composition Study on Structure Property of submerged arc weld, all be by developing research that new welding wire carries out, although this research approach is high, comparatively reliable to weld seam alloy transition rate from welding wire, welding technology accommodation is also wider, but there is following deficiency in it: the one, and there is complex procedures in the making of welding wire, and need to smelt, water that ingot, billet rolling, wire rod are rolling, complicated procedures of forming and the equipment such as drawing and copper facing, especially when the higher welding wire of development alloy content, also need during drawing through annealing in process repeatedly; The 2nd, because test is few with the welding wire use amount, causes and carry out composition of weld line and high, the consuming time length of performance study cost; The 3rd, need with special-purpose wire rod making apparatus, otherwise can't carry out;
The 4th, also can can't use because some alloy system wire rod cannot be drawn into silk because drawing property is bad; Rectangular submerged-arc welding wires (ZL200920086870.X) can be without drawing, but needs accurately bright and clean cutting even grind, and the maintaining requirement of welding wire is also had higher requirement.
Alloying element butt welded seam toughness affect more complicated, at present also without comparison reliably method toughness predict, main rely on to weld test.From upper surface analysis, by the welding wire of making different-alloy content traditional research method that submerged arc weld carries out composition and performance there is too many limitation.Therefore exploring a kind of submerged arc weld composition performance study new technology still has using value.
Summary of the invention
The object of the invention is to overcome at present the deficiency that exists by the mode that adopts new welding wire to manufacture and design to carry out the submerged-arc welding seam performance study, a kind of test substrate by making different-alloy content is provided, reaches and adopt suitable submerged welding process, make weld metal come from mother metal more than 70%; Weld seam chemical composition, Microstructure and properties produce needed variation because test substrate composition is different, and test findings is objective, accurate, and the test method of this research submerged arc weld composition and performance is simple, easy to operate, directive significance is strong.
Realize the measure of above-mentioned purpose:
A kind of test method of studying submerged arc weld composition and performance, its step:
1) preparation test substrate:
A, set chemical composition and the weight percent content of test substrate according to the test needs;
B, smelt and become base, the terminal point composition of molten steel meets the setting requirement;
C, be rolled, be rolled into thickness at 10.5 ~ 12mm, width is not less than the test substrate of 150mm;
2) adopt the welding wire of common or coupling respectively to weld weld seam one at the pros and cons relative position of test substrate, and control double-edged welding seam bias value and be not more than 0.05mm, overlapping value is at 2.0 ~ 3.0mm;
3) test and analyze and research according to conventional butt welded seam.
It is characterized in that: positive weld seam weld heat input is controlled at 10 ~ 12kJ/cm, and the weld seam weld heat input of reverse side is controlled at 14 ~ 16kJ/cm.
The present invention with compare by developing new welding wire research approach, composition of weld line and tissue change with the variation of test substrate composition; The welding seam tissue capability test findings is reliable; Need not make welding wire for submerged-arc welding, avoid welding wire and made difficult problem, convenient, saving; Need not specialized equipment; Through demonstration tests such as butt welded seam composition, intensity, hardness, impact flexibility, the result is reasonable.And studied simultaneously the impact of the elements such as C, Mn, Si, Ni, Cr on the submerged arc weld obdurability, obtained the result who is highly profitable.To the development of welding wire for submerged-arc welding, very important directive significance is arranged.
Description of drawings
Fig. 1 submerged arc welding schematic diagram of the present invention;
Fig. 2 is the seam cross-section macrograph that the present invention welds.
Embodiment
The below is described in detail the present invention:
Test condition: employing be that the 50kg vacuum drying oven has been smelted 5 stoves tests substrate steel, specific chemical composition sees Table 1; Gage of wire 4mm, test welding wire chemical composition sees Table 2, and solder flux is alkalescent sintered flux CHF101, toasts through 350 ℃+1h before the weldering.
The welding technique of submerged arc welding condition sees Table 3; Adopt the submerged arc welding of ESAB direct current, dc reverse connection; With the tight clamping of test plate (panel), weld positive and negative twice weld seam with horizontal level at steel plate.
Various embodiments of the present invention are according to following steps production:
1) preparation test substrate:
A, set chemical composition and the weight percent content of test substrate according to the test needs;
B, smelt and become base, the terminal point composition of molten steel meets the setting requirement;
C, be rolled, be rolled into thickness at 10.5 ~ 12mm, width is not less than the test substrate of 150mm;
2) welding wire that adopts common or coupling welds one weld seam at the pros and cons relative position of test substrate, and controls double-edged welding seam bias value and be not more than 0.05mm, and overlapping value is at 2.0 ~ 3.0mm;
3) test and analyze and research according to conventional butt welded seam.
Table 1 is tested substrate chemical composition (wt%) for each embodiment;
Table 2 is test welding wire chemical composition (wt%);
Table 3 is each embodiment welding technique of submerged arc welding condition;
Table 4 is each embodiment weld seam chemical composition (wt%);
Table 5 is each embodiment weld hardness test result (HV
10);
Table 6 is each embodiment weld seam stretch test result;
Table 7 is each embodiment weld impact test result.
Each embodiment of table 1 tests substrate chemical composition (wt%)
Table 2 test welding wire chemical composition (wt%)
Each embodiment welding technique of submerged arc welding condition of table 3
Postwelding two side welds approximately have 2.2 ~ 2.9mm overlapping, the amount of being partially welded 0.2 ~ 0.4mm.Can find out from shown in Figure 2, base metals shared ratio in weld metal surpasses 70%, and the centering of two sides weld seam and middle part are overlapping very desirable, and the shaping of visible weld seam is extraordinary.
Each embodiment weld seam chemical composition (wt%) of table 4
Each embodiment weld hardness test result (HV of table 5
10)
| Embodiment | 1 | 2 | 3 | 4 | 5 |
| Hardness number | 198 207 209 | 206 213 215 | 185 188 190 | 227 230 232 | 216 218 221 |
Each embodiment weld seam stretch test result of table 6
Each embodiment weld impact test result of table 7
Annotate: be mean value in the bracket, test temperature is-20 ℃.
Compare 2#, 3#, three groups of test findings of 4#, every group of test plate (panel) thickness, welding wire, solder flux and welding technology are identical, but only have the composition of test plate (panel) different.Can find out, during the test plate (panel) chemical composition change (table 1), the weld seam chemical composition produces respective change (table 4), and weld strength, hardness have significant change (table 5 and table 6), simultaneously, can also obtain standard-sized impact specimen, and impact flexibility is higher.The thickness of 1# and 5# test plate (panel) is different, also obtains preferably experimental result.Be the test plate (panel) of 10.5 ~ 12 (mm) by selecting different chemical composition, thickness, adopt suitable submerged welding process, obtained the weld seam of different chemical composition and structure property, effectively studied the relation of submerged-arc welding seam composition and welding seam tissue capability.
By implementing the technology with upper type, produced very valuable test findings.Design, the implementation method that proves absolutely the technology is successfully and respond well, has practicality, novelty, innovation and reliable characteristics.
Above-described embodiment only exemplifies for the typical case, and is not to be restriction to embodiments of the present invention.
Claims (2)
1. test method of studying submerged arc weld composition and performance, its step:
1) preparation test substrate:
A, set chemical composition and the weight percent content of test substrate according to the test needs;
B, smelt and become base, the terminal point composition of molten steel meets the setting requirement;
C, be rolled, be rolled into thickness at 10.5 ~ 12mm, width is not less than the test substrate of 150mm;
2) adopt the welding wire of common or coupling respectively to weld weld seam one at the pros and cons relative position of test substrate, and control double-edged welding seam bias value and be not more than 0.05mm, overlapping value is at 2.0 ~ 3.0mm;
3) test and analyze and research according to conventional butt welded seam.
2. a kind of test method of studying submerged arc weld composition and performance as claimed in claim 1 is characterized in that: positive weld seam weld heat input is controlled at 10 ~ 12kJ/cm, and the weld seam weld heat input of reverse side is controlled at 14 ~ 16kJ/cm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105345236A (en) * | 2015-12-11 | 2016-02-24 | 武汉钢铁(集团)公司 | Control method for phosphorus content of submerged-arc welding deposited metal |
| CN114279869A (en) * | 2021-11-22 | 2022-04-05 | 岚图汽车科技有限公司 | Weld toughness evaluation method |
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| CN1593836A (en) * | 2004-06-25 | 2005-03-16 | 武汉钢铁(集团)公司 | High strength high tenacity high weather resistant gas protecting welding wire |
| CN101337301A (en) * | 2008-08-06 | 2009-01-07 | 武汉钢铁(集团)公司 | Submerged arc welding method of bridge steel of different intensity scale |
| CN101559541A (en) * | 2009-05-19 | 2009-10-21 | 武汉钢铁(集团)公司 | Test method and device for weld seam alloying in gas shielded welding |
| CN201415305Y (en) * | 2009-06-23 | 2010-03-03 | 武汉钢铁(集团)公司 | Welding torch for rectangular submerged-arc welding wires |
| CN102198573A (en) * | 2011-04-28 | 2011-09-28 | 蒋才银 | Automatic submerged arc welding agent and preparation method thereof |
-
2013
- 2013-05-27 CN CN2013102007299A patent/CN103323572A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1593836A (en) * | 2004-06-25 | 2005-03-16 | 武汉钢铁(集团)公司 | High strength high tenacity high weather resistant gas protecting welding wire |
| CN101337301A (en) * | 2008-08-06 | 2009-01-07 | 武汉钢铁(集团)公司 | Submerged arc welding method of bridge steel of different intensity scale |
| CN101559541A (en) * | 2009-05-19 | 2009-10-21 | 武汉钢铁(集团)公司 | Test method and device for weld seam alloying in gas shielded welding |
| CN201415305Y (en) * | 2009-06-23 | 2010-03-03 | 武汉钢铁(集团)公司 | Welding torch for rectangular submerged-arc welding wires |
| CN102198573A (en) * | 2011-04-28 | 2011-09-28 | 蒋才银 | Automatic submerged arc welding agent and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105345236A (en) * | 2015-12-11 | 2016-02-24 | 武汉钢铁(集团)公司 | Control method for phosphorus content of submerged-arc welding deposited metal |
| CN114279869A (en) * | 2021-11-22 | 2022-04-05 | 岚图汽车科技有限公司 | Weld toughness evaluation method |
| CN114279869B (en) * | 2021-11-22 | 2023-11-10 | 岚图汽车科技有限公司 | Weld toughness evaluation method |
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Application publication date: 20130925 |