CN102962625A - Method for removing slag in submerged arc welding of thick steel plate - Google Patents
Method for removing slag in submerged arc welding of thick steel plate Download PDFInfo
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- CN102962625A CN102962625A CN2012104813346A CN201210481334A CN102962625A CN 102962625 A CN102962625 A CN 102962625A CN 2012104813346 A CN2012104813346 A CN 2012104813346A CN 201210481334 A CN201210481334 A CN 201210481334A CN 102962625 A CN102962625 A CN 102962625A
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Abstract
The invention relates to a method for removing slag in submerged arc welding of a thick steel plate, belonging to the technical field of a slag cleaning method. According to the technical scheme, the method comprises the following steps of: selecting welding parameters at first, cleaning welding flux on the slag surface through a cleaning tool after welding is started, coating paraffin on the slag after the temperature of the slag surface reaches a certain range, cleaning the slag through a flat shovel, and burning excessive paraffin on the surface through gas cutting flame, thereby effectively removing the slag in the submerged arc welding. Since the reasonable welding parameters are selected and the slag surface is coated with the paraffin after the temperature of the slag decreases to a certain range, the slag can be easily removed, and the efficiency of slag cleaning can be improved greatly. By adopting various of process measures, no pores, cracks or other defects can be generated in welding. According to results of ultrasonic flaw detection on a weld pass which is welded by the method, no pores, cracks or other defects are found. The method is simple and practical, the slag in a submerged arc welding seam can be removed effectively, and the labor productivity can be improved.
Description
Technical field
The present invention relates to a kind of removal method of thick steel plate submerged arc welding slag, belong to slag method for cleaning technical field.
Background technology
Submerged arc welding is oil tank of transformer manufacturing a kind of welding manner commonly used, and the composition of weld line of this kind welding method welding is even, and smooth-shaped is attractive in appearance, and weldquality is good, stable.Yet when steel plate thickness increases, thickness is greater than 40mm, behind the steel plate bevel so that groove depth is darker, cause like this welding bead number of plies to increase, weld at least more than three times, because narrow space in the groove, it is very difficult to remove slag, especially weld the welding bead slag of first pass and remove, usually clear up by electric tool, cleaning effect is also undesirable.
Summary of the invention
The removal method that the purpose of this invention is to provide a kind of thick steel plate submerged arc welding slag, by selecting rational welding parameter, the impact that the expansion coefficient difference that utilizes paraffin to eliminate slag and welding bead causes slag to solidify improves the slag cleaning efficiency, thereby solves the problems referred to above that background technology exists.
The technical solution adopted for the present invention to solve the technical problems is: a kind of removal method of thick steel plate submerged arc welding slag, it is characterized in that comprising following steps, at first select welding parameter, after the welding beginning, solder flux with cleaning device cleaning slag surface, when the slag surface temperature reaches 300 ℃ of-600 ℃ of scopes, smear paraffin at slag, use the flat chisel molten slag removal, at last with the unnecessary paraffin of gas cutting flame effects on surface burning, thereby effectively remove the submerged-arc welding slag, complete rear next time of welding, the same first pass of the method for follow-up molten slag removal; The described welding parameter of at first selecting is that gage of wire is selected 4mm, welding current 500-700A, voltage 36-40V, speed 300-400mm/min.
The main component of described paraffin is C
22H
46(n-docosane) and C
28H
58(positive octacosane).
Described step of smearing paraffin at slag will be smeared paraffin in the slag both sides.
It is described that to smear the time that paraffin waits for later at slag be 5-8 minute.
The invention has the beneficial effects as follows, select rational welding parameter, after the slag temperature is cooled to uniform temperature, smear paraffin on the slag surface, wait for that suitable a period of time clears up, can remove easily slag, greatly improve the slag cleaning efficiency, owing to adopt the kinds of processes measure, can guarantee that welding can not produce pore, defects i.e.cracks, to the welding bead employing ultrasonic examination of the method welding, do not find pore, crackle and other defective, method simple practical can be removed the submerged arc weld slag effectively, has also improved labor productivity simultaneously.
The specific embodiment
The present invention is further described below in conjunction with embodiment.
A kind of removal method of thick steel plate submerged arc welding slag is characterized in that comprising following steps, at first selects welding parameter, after the welding beginning, with the solder flux on cleaning device cleaning slag surface, when the slag surface temperature reaches prescribed limit, smear paraffin at slag, wait for after 5-8 minute, use the flat chisel molten slag removal, at last with the unnecessary paraffin of gas cutting flame effects on surface burning, thereby effectively remove the submerged-arc welding slag, complete rear next time of welding, the same first pass of the method for follow-up molten slag removal.
The described welding parameter of at first selecting is that gage of wire is selected 4mm, welding current 500-700A, voltage 36-40V, speed 300-400mm/min.
Described step of smearing paraffin at slag is to carry out when the slag surface temperature reaches 300 ℃-600 ℃, when namely the slag crineous is about to disappear.
The main component of described paraffin is C
22H
46(n-docosane) and C
28H
58(positive octacosane).
Described step of smearing paraffin at slag will be smeared paraffin in the slag both sides, to guarantee to penetrate into slag and face of weld.
It is described that to smear the time that paraffin waits for later at slag be 5-8 minute.
It mainly is that the coefficient of expansion of welding slag and welding bead there are differences that the slag difficulty is taken off in narrow gap, temperature reduces the extruding that slag is subject to peripheral metal, be set in the groove welding gap, after smearing paraffin, melted paraffin wax is deep into adhesion place of slag and peripheral metal, continue to have played lubrication in the cooling procedure at slag and peripheral metal, a part of paraffin at high temperature burns in paraffin infiltration process, sub-fraction enters in the slag, after cleaning out, remove unnecessary paraffin with flame, can not impact the quality weld seam to guarantee that paraffin remains in the weld seam.
Embodiment one, the steel plate splicing of two 4000 * 2000 * 40mm, open U-shaped groove, select welding parameter, gage of wire is selected 4mm, welding current 600A, voltage 40V, speed 350mm/min is after the welding beginning, solder flux with cleaning device cleaning slag surface, when slag surface temperature during at 300 ℃～600 ℃, smear paraffin at slag, smear in the slag both sides when smearing, to guarantee to penetrate into slag and face of weld, wait for after 8 minutes, use the flat chisel molten slag removal, after slag cleans out, with the unnecessary paraffin of gas cutting flame effects on surface burning, complete rear next time of welding.
Claims (4)
1. the removal method of a thick steel plate submerged arc welding slag, it is characterized in that comprising following steps, at first select welding parameter, after the welding beginning, solder flux with cleaning device cleaning slag surface, when the slag surface temperature reaches 300 ℃ of-600 ℃ of scopes, smear paraffin at slag, use the flat chisel molten slag removal, at last with the unnecessary paraffin of gas cutting flame effects on surface burning, thereby effectively remove the submerged-arc welding slag, complete rear next time of welding, the same first pass of the method for follow-up molten slag removal; The described welding parameter of at first selecting is that gage of wire is selected 4mm, welding current 500-700A, voltage 36-40V, speed 300-400mm/min.
2. the removal method of thick steel plate submerged arc welding slag as claimed in claim 1, the main component that it is characterized in that described paraffin is C
22H
46(n-docosane) and C
28H
58(positive octacosane).
3. the removal method of thick steel plate submerged arc welding slag as claimed in claim 1 is characterized in that described step of smearing paraffin at slag will smear paraffin in the slag both sides.
4. the removal method of thick steel plate submerged arc welding slag as claimed in claim 1 is characterized in that smearing the later time of waiting for of paraffin at slag is 5-8 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104813346A CN102962625A (en) | 2012-11-23 | 2012-11-23 | Method for removing slag in submerged arc welding of thick steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104813346A CN102962625A (en) | 2012-11-23 | 2012-11-23 | Method for removing slag in submerged arc welding of thick steel plate |
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| Publication Number | Publication Date |
|---|---|
| CN102962625A true CN102962625A (en) | 2013-03-13 |
Family
ID=47793215
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|---|---|---|---|
| CN2012104813346A Pending CN102962625A (en) | 2012-11-23 | 2012-11-23 | Method for removing slag in submerged arc welding of thick steel plate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103600163A (en) * | 2013-11-22 | 2014-02-26 | 沈阳大学 | Narrow-gap submerged arc welding slag cleaning device |
| CN110682010A (en) * | 2019-10-22 | 2020-01-14 | 嘉兴凤翼特种材料科技有限公司 | Method for removing metal adhering slag generated by laser cutting or punching |
| CN111940956A (en) * | 2020-08-19 | 2020-11-17 | 六安科亚信息科技有限公司 | Cold type welding slag removing method applied to robot welding |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU557888A1 (en) * | 1975-08-01 | 1977-05-15 | The method of removing slag from the weld | |
| JPS5918157B2 (en) * | 1977-08-02 | 1984-04-25 | タイホ−工業株式会社 | How to remove welding slag |
| JPH0542371A (en) * | 1991-08-08 | 1993-02-23 | Nippon Steel Corp | Slag collecting device for steel pipe outside welding line |
| JPH0788692A (en) * | 1993-09-17 | 1995-04-04 | Ishikawajima Harima Heavy Ind Co Ltd | Device for removing welding slug |
| CN102009255A (en) * | 2010-12-01 | 2011-04-13 | 武昌船舶重工有限责任公司 | Downward and butt welding process for high strength steel for ship structure |
| KR20120020468A (en) * | 2010-08-30 | 2012-03-08 | 현대제철 주식회사 | Welding slag removal apparatus for flux-cored arc welding and automatic welding carriage |
-
2012
- 2012-11-23 CN CN2012104813346A patent/CN102962625A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU557888A1 (en) * | 1975-08-01 | 1977-05-15 | The method of removing slag from the weld | |
| JPS5918157B2 (en) * | 1977-08-02 | 1984-04-25 | タイホ−工業株式会社 | How to remove welding slag |
| JPH0542371A (en) * | 1991-08-08 | 1993-02-23 | Nippon Steel Corp | Slag collecting device for steel pipe outside welding line |
| JPH0788692A (en) * | 1993-09-17 | 1995-04-04 | Ishikawajima Harima Heavy Ind Co Ltd | Device for removing welding slug |
| KR20120020468A (en) * | 2010-08-30 | 2012-03-08 | 현대제철 주식회사 | Welding slag removal apparatus for flux-cored arc welding and automatic welding carriage |
| CN102009255A (en) * | 2010-12-01 | 2011-04-13 | 武昌船舶重工有限责任公司 | Downward and butt welding process for high strength steel for ship structure |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103600163A (en) * | 2013-11-22 | 2014-02-26 | 沈阳大学 | Narrow-gap submerged arc welding slag cleaning device |
| CN103600163B (en) * | 2013-11-22 | 2015-08-19 | 沈阳大学 | Narrow-clearance submerged arc welding slag cleaning plant |
| CN110682010A (en) * | 2019-10-22 | 2020-01-14 | 嘉兴凤翼特种材料科技有限公司 | Method for removing metal adhering slag generated by laser cutting or punching |
| CN111940956A (en) * | 2020-08-19 | 2020-11-17 | 六安科亚信息科技有限公司 | Cold type welding slag removing method applied to robot welding |
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Application publication date: 20130313 |