CN102950370A - Submerged-arc welding process method for welding H-shaped steel with web plate more than 16mm thick - Google Patents
Submerged-arc welding process method for welding H-shaped steel with web plate more than 16mm thick Download PDFInfo
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Abstract
The invention relates to the technical field of welding of H-shaped steel and particularly relates to a back-chipping-free full-penetration submerged-arc welding process method for welding H-shaped steel with a web plate more than 16mm thick. The process method comprises the steps of material selection, edge preparation, assemblage of the H-shaped steel, positioned welding, preparation before welding, welding and the like, wherein the assemblage is required to be zero assembling, and an assembling interval is less than or equal to 0.5mm; the angles of K-shaped symmetrical beveled edges are designed to be at 60+/-2 degrees, and the truncated edges of the beveled edges range from 1mm to 2mm; and the standard lengths of copper cushion blocks are designed to be 530mm and 130mm. The submerged-arc welding process method has the advantages of low cost, high efficiency, labor saving, reduction in environmental pollution and the like; and according to primary measurement and calculation, the welding process method can reduce the cost for welding the H-shaped steel with the web plate more than 16mm thick by 25%.
Description
Technical field
The present invention relates to H shaped steel welding technology field, especially relate to a kind of back chipping full penetration submerged welding process method of exempting from of using during greater than the H shaped steel of 16mm for the welding web thickness.
Background technology
Traditional welding H shaped steel full penetration submerged-arc welding process require when web thick greater than 16mm and when the full penetration requirement is arranged, the necessary back chipping in the back side of weld seam, the carbon arc air gouging back chipping is usual way in the present steel construction industry, this mode production efficiency is higher about 4 times than pneumatic shovel, especially superiority is larger when all-position welding, relative reduce the workpiece processing cost, when removing root of weld defective, planing surface is bright and clean, but also there is following shortcoming: 1) easily make conduit carburetting, and a large amount of smog of carbon arc generation, dust, noise, serious and the infringement health of the environmental pollutions such as arc light radiation; 2) the thorough degree of Defect removal be difficult for to guarantee, and weld bond regular shape and welding quality are wayward; 3) during carbon arc air gouging, because the input of a large amount of heat energy easily causes member angular deformation, torsional deformation by a relatively large margin, when serious even so that member is scrapped, cause the wasting of resources of human and material resources, financial resources.
Summary of the invention
The object of the invention is to overcome the shortcoming that exists in the prior art, a kind of submerged welding process method of exempting from back chipping, full penetration, being used for the welding large H-shaped steel is provided, the method is by the ingenious welding of the first road of selection and the back side weld seam of welding parameter, reached above-mentioned purpose, the technical scheme that adopts is: a kind of web thickness that welds is greater than the H shaped steel submerged welding process method of 16mm, and it is characterized in that: this process may further comprise the steps:
1) selection: according to mother metal character, select suitable welding material;
2) processing of web groove: processing web groove, groove type are the symmetrical groove of K type;
3) group of H shaped steel is vertical: web and groups of vanes are stood in together, and vertical complete rear formation zero group of group is to the gap; With tack welding described web and wing plate position are fixed;
4) tack welding: tack welding adopts the dual contact weldering, and the tack welding weld bead height is 1/3 of weld bead height;
5) prepare before the weldering: make one group of the copper cushion block that has groove; Before the welding foreign material such as the oil film of welding wire surface, iron rust are removed totally, and tack weld polished, do not affect welding wire by being as the criterion with the height of the complete rear tack weld of polishing; Should be noted that in bruting process and do not damage the web groove, the complete rear employing compressed air of polishing is cleared up web groove, gap location, removes the pollutants such as dust; Before solder flux uses, should and be incubated 1 hour 350 ℃ of lower bakings 2 hours;
6) welding:
61) root backing welding: welding wire axis alignment gap center and slightly be partial to web 1-2mm in the welding, use copper cushion block in the welding, the fusion penetration of root backing run is selected larger fusion penetration, weld complete after, knock out copper cushion block;
62) welding of first road, back side weld seam: before the welding, adopt compressed air that groove, gap location are cleared up, select larger heat input and slower speed of welding during welding, be beneficial to root defect and impurity and pay on the face of weld, root defect is removed;
63) welding of all the other weld seams: first road weld seam welds respectively to its both sides successively as benchmark take the back side, until welding is finished.
Technical characterictic of the present invention also has: zero group refers to before group is vertical web and wing plate be proofreaied and correct to the gap step 3), guarantee that web and wing plate part plan degree are not more than 2mm/1000mm, the wing plate perpendicularity is not more than 2mm, the web center offset is not more than 2mm, and final assurance group is to gap≤0.5mm.
Technical characterictic of the present invention also has: the fusion length of tack welding step 3) is 20-40mm, and spacing is not more than 300mm between the tack welding weld seam.
Technical characterictic of the present invention also has: the symmetrical bevel angle of the type of K step 2) is 60 ± 2 °, root face 1～2mm.
Technical characterictic of the present invention also has: first road, back side weld seam welding parameter is step 6): electric current 720-730A, voltage 37-39V, speed of welding 500-510mm/min.
Technical characterictic of the present invention also has: root backing welding welding parameter is step 6): electric current 680-700A, voltage are 36-38V, and speed of welding is 390-400mm/min.
Technical characterictic of the present invention also has: the full-length of copper cushion block has two kinds of 530mm and 130mm step 5), is used alternatingly according to fusion length.
Beneficial effect of the present invention is: 1) the web groove of flame processing, root face and zero group so that the air contact area is little in root and the gap, are conducive to reduce the quantity of root burning and root defect to the use in gap; 2) selecting of suitable groove type and weldment placed angle satisfied the requirement that obtains the weld seam of high-quality full penetration; 3) use of the special welding parameter of the first road in root backing welding and back side welding bead, the defectives such as a small amount of oxide that root pass stays, pore, slag inclusion are had on enough energy and the time emersion face of weld, root defect is removed, reached the effect of exempting back chipping; 4) this technique is compared with traditional handicraft, has the advantage that cost is low, efficient is high, save manpower, environmental contamination reduction.Initial estimate the present invention can reduce web thickness greater than 25% of the welded H section steel cost of 16mm.
Description of drawings
Accompanying drawing 1 is that median ventral plate groove of the present invention is made schematic diagram, and accompanying drawing 2 is first road, back side weld seam welding schematic diagrames, and accompanying drawing 3 is welding bead ordering schematic diagrames.
The specific embodiment
Below in conjunction with drawings and Examples, invention is specifically described.H shape steel web thickness is 28mm in the present embodiment, and specification is H1000*250*28*28mm, and quality of parent material is Q345B, requires full penetration, adopts this process may further comprise the steps:
1) selection of welding material: according to mother metal character, selecting gage of wire is 4mm, and solder flux is slack woods HJ101, and granularity is the 10-40 order;
2) processing of web groove: processing web groove, groove type are the symmetrical groove of K type, and the symmetrical bevel angle of K type is 60 ± 2 °, root face 1～2mm;
3) group of H shaped steel is vertical: web and groups of vanes are stood in together, and vertical complete rear formation zero group of group is to the gap; Should the gap be referred at first web and wing plate be proofreaied and correct before group is vertical zero group, guarantee that web and wing plate part plan degree are not more than 2mm/1000mm, the wing plate perpendicularity is not more than 2mm, and the web center offset is not more than 2mm, and final assurance group to the gap between 0-0.5mm;
4) tack welding: vertical complete with tack welding web and wing plate position are fixed afterwards of group, it is that ER50-6, diameter are the wlding of 1.2mm that this tack welding adopts the welding wire trade mark, tack welding solder joint length is 30mm, spacing is 500mm, tack welding adopts the dual contact weldering, and the tack welding weld bead height is 1/3 of weld bead height;
5) prepare before the weldering: make one group of the copper cushion block that has groove, full-length has two kinds of 530mm and 130mm, is used alternatingly according to fusion length; Before the welding foreign material such as the oil film of welding wire surface, iron rust are removed totally, and tack weld polished, do not affect welding wire by being as the criterion with the height of the complete rear tack weld of polishing; Should be noted that in bruting process and do not damage the web groove, the complete rear employing compressed air of polishing is cleared up web groove, gap location, removes the pollutants such as dust; Before solder flux uses, should and be incubated 1 hour 350 ℃ of lower bakings 2 hours;
6) welding:
61) root backing welding: web 1-2mm also slightly is partial at welding wire axis alignment gap center in the welding, use copper cushion block in the welding, root backing welding welding parameter is: electric current 680-700A, voltage is 36-38V, speed of welding is 390-400mm/min, to obtain large as far as possible fusion penetration, after the backing welding welding is complete, knock out copper cushion block;
62) welding of first road, back side weld seam: before the welding, adopt compressed air that groove, gap location are cleared up, select larger heat input and slower speed of welding during welding, first road, back side weld seam welding parameter is in the enforcement: electric current 720-730A, voltage 37-39V, speed of welding 500-510mm/min is beneficial on root defect and the impurity emersion face of weld root defect be removed;
63) welding of all the other weld seams: first road weld seam welds respectively to its both sides successively as benchmark take the back side, until welding is finished, all the other weld seams all weld according to the common process parameter, good with fusion between the road, appearance of weld is attractive in appearance, take off slag easily is benchmark, and specifically each road weld seam parameter sees Table 1.
Table 1: weld seam technological parameter.
Technique and traditional back chipping welding manner are compared, see Table 2.
Certainly, above-mentioned explanation is not limitation of the present invention, and the present invention also is not limited only to above-mentioned giving an example, and the variation that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement also belong to protection scope of the present invention.
Claims (7)
1. one kind is welded web thickness greater than the H shaped steel submerged welding process method of 16mm, and it is characterized in that: this process may further comprise the steps:
1) selection: according to mother metal character, select suitable welding material;
2) processing of web groove: processing web groove, groove type are the symmetrical groove of K type;
3) group of H shaped steel is vertical: web and groups of vanes are stood in together, and vertical complete rear formation zero group of group is to the gap; With tack welding described web and wing plate position are fixed;
4) tack welding: tack welding adopts the dual contact weldering, and the tack welding weld bead height is 1/3 of weld bead height;
5) prepare before the weldering: make one group of the copper cushion block that has groove; Before the welding foreign material such as the oil film of welding wire surface, iron rust are removed totally, and tack weld polished, do not affect welding wire by being as the criterion with the height of the complete rear tack weld of polishing; Should be noted that in bruting process and do not damage the web groove, the complete rear employing compressed air of polishing is cleared up web groove, gap location, removes the pollutants such as dust; Before solder flux uses, should and be incubated 1 hour 350 ℃ of lower bakings 2 hours;
6) welding:
61) root backing welding: welding wire axis alignment gap center and slightly be partial to web 1-2mm in the welding, use copper cushion block in the welding, the fusion penetration of root backing run is selected larger fusion penetration, weld complete after, knock out copper cushion block;
62) welding of first road, back side weld seam: before the welding, adopt compressed air that groove, gap location are cleared up, select larger heat input and slower speed of welding during welding, be beneficial on root defect and the impurity emersion face of weld root defect be removed;
63) welding of all the other weld seams: first road weld seam welds respectively to its both sides successively as benchmark take the back side, until welding is finished.
2. according to H shaped steel submerged welding process method claimed in claim 1, it is characterized in that: zero group refers to before group is vertical web and wing plate be proofreaied and correct to the gap described in the step 3), guarantee that web and wing plate part plan degree are not more than 2mm/1000mm, the wing plate perpendicularity is not more than 2mm, the web center offset is not more than 2mm, and final assurance group is to gap≤0.5mm.
3. according to H shaped steel submerged welding process method claimed in claim 1, it is characterized in that: the fusion length of tack welding described in the step 3) is 20-40mm, and spacing is not more than 300mm between the tack welding weld seam.
4. according to H shaped steel submerged welding process method claimed in claim 1, it is characterized in that: step 2) described in the symmetrical bevel angle of K type be 60 ± 2 °, root face 1～2mm.
5. according to H shaped steel submerged welding process method claimed in claim 1, it is characterized in that: first road, back side weld seam welding parameter is in the step 6): electric current 720-730A, voltage 37-39V, speed of welding 500-510mm/min.
6. according to H shaped steel submerged welding process method claimed in claim 5, it is characterized in that: root backing welding welding parameter is in the step 6): electric current 680-700A, voltage are 36-38V, and speed of welding is 390-400mm/min.
7. according to H shaped steel submerged welding process method claimed in claim 1, it is characterized in that: the full-length of copper cushion block has two kinds of 530mm and 130mm in the step 5), is used alternatingly according to fusion length.
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| CN103785934A (en) * | 2014-03-03 | 2014-05-14 | 山东电力建设第二工程公司 | Thin-plate H-type steel and main angular welding joint full penetration welding method in full penetration welding process |
| CN103831506A (en) * | 2014-03-11 | 2014-06-04 | 中国化学工程第六建设有限公司 | Nitinol welding method |
| CN104002023A (en) * | 2014-05-29 | 2014-08-27 | 南通中远重工有限公司 | Welding process special for thick dissimilar material plate |
| CN104526135A (en) * | 2014-11-20 | 2015-04-22 | 上海沪临重工有限公司 | Non-back gouging submerged-arc welding method of H-shaped steel |
| CN104625340A (en) * | 2013-11-07 | 2015-05-20 | 上海宝冶集团有限公司 | Manual welding method of high-strength small-size H-shaped steel |
| CN104942411A (en) * | 2014-03-27 | 2015-09-30 | 株式会社神户制钢所 | Multi-electrode single-side submerged arc welding method |
| CN105081595A (en) * | 2015-02-04 | 2015-11-25 | 上海船舶工艺研究所 | Fillet weld welding structure for K-type grooves of moderately-thick plate without back chipping and welding technology of fillet weld welding structure |
| CN105149807A (en) * | 2015-10-22 | 2015-12-16 | 中国二十二冶集团有限公司 | Manufacturing method of high-strength thick plate steel structure |
| CN105196005A (en) * | 2015-10-28 | 2015-12-30 | 上海振华重工机械配套有限公司 | Equalizing beam longitudinal joint back chipping-free full penetration submerged-arc welding forming process |
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