CN201889596U - Welding wire for welding low-alloy high-strength steel - Google Patents
Welding wire for welding low-alloy high-strength steel Download PDFInfo
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- CN201889596U CN201889596U CN2009202674554U CN200920267455U CN201889596U CN 201889596 U CN201889596 U CN 201889596U CN 2009202674554 U CN2009202674554 U CN 2009202674554U CN 200920267455 U CN200920267455 U CN 200920267455U CN 201889596 U CN201889596 U CN 201889596U
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Abstract
The utility model discloses a welding wire for welding low-alloy high-strength steel, which is characterized in that: plating a protection layer which can form a compact oxide on the surface of the low-alloy high-strength steel and a welding seam is required; the middle part of the welding wire is provided with a hollow part; the hollow part in the welding wire accommodates a welding compound core; and the components in the welding compound core facilitates cleaning welding slag on the welding seam of the low-alloy high-strength steel. Compared with the prior art, the welding wire of the utility model has the following advantages: facilitated slag cleaning, capability for forming a smooth welding seam surface, easy zinc plating, better welding operation performance and less welding splash.
Description
Technical field
The utility model relates to a kind of welding welding wire that is used for the soldering low alloy high-strength steel.
Background technology
Electricity tower (electric power tower) is widely used in long builds the high-tension bus-bar cable apart from frame, transferring high voltage especially, as be higher than 500,000 volts high-tension bus-bar cable.When frame is built the high-tension bus-bar cable, the height of electric tower there is certain requirement, because the span and the terrain clearance minimum altitude that requires to have determined electric tower of high-tension bus-bar cable between Liang Dianta.
Former very long a period of time, electric tower adopts the low-intensity steel to build (as the Q295 steel); And electric tower parts surface does not have coating.But, in 2008, southern china occurrence of large-area snow disaster, the snow disaster longer duration causes on the electric wire freezing, ice thickness thickness even surpass 50mm.The line pulling force that electric wire produces adds the pressure that accumulated ice produces, and the most a lot of electric towers crush, and transmission of electricity is interrupted, and brings very big difficulty for people's life.The reason that brainstrust analysis electricity tower collapses is because the electric tower bearing capacity of southern area is too small, and after the electric wire surface froze, the load of electric tower had exceeded its scope that can bear.In order to strengthen (the comprising snow disaster) ability of combating a natural disaster, require to improve the bearing capacity of electric tower.
At present, big energy base is just being set about building by country, promptly selects for use solar energy, wind energy or nuclear energy in the area that is fit to generating, and a large amount of electric energy are provided, and the power delivery in these big energy bases is arrived various places.These big energy bases may be away from the land used that makes of electric energy.Voltage is high more, and the distance that can carry is just long more.In order to increase the distance that to carry, generally be to adopt to improve voltage method, improve and carry the problem that needs to consider behind the voltage to be, can bring very large influence to environment in the voltage course of conveying, especially the radiation of its generation may can bring harm to health.Therefore, when adopting high pressure or UHV transmission, need electric wire farther, to guarantee human body safety apart from ground.Therefore also just require the height of electric tower enough high.The electricity tower is high more, and its load is just big more, also requires higher to the bearing capacity of electric tower.In order to increase the height of electric tower, need to use to have the more electric tower parts of high-bearing capacity.
In addition, for the electric tower of same height, electric tower ground is big more, because ground is big, electric tower assembly just can be done greatly to increase bearing capacity, and is just low more to the requirement of strength of electric tower parts.The ground of electricity tower is more little, and electric tower parts just can only be made lessly.Electricity tower ground is more little, and is just big more to the requirement of strength of electric tower parts.But,, have the electric tower of small electric tower ground to take up an area of little with respect to the electric tower that bigger electric tower ground is arranged.In order to reduce land used, also require to improve the bearing capacity of electric tower to make the more electric tower of small size.
The electricity tower depends on two factors in outdoor long-time bearing power, the one, depend on the intensity of the steel that is adopted, and the intensity of steel is high more, and then bearing capacity is big more.The 2nd, in the service life of the employed parts of electric tower, electric tower long term exposure is subjected to erosion by wind and rain easily in atmospheric environment, as not protection, after then long-time the use, will cause the corrosion of steel, and the steel bearing capacity of being corroded reduces.Therefore, improve the bearing capacity of electric tower, the one, select low-alloy high-strength steel for use, the 2nd, electric tower parts surface is carried out the coating protection, as zinc-plated, to prevent that electric tower is corroded, corrosion.So, the requirement that the electric tower construction material in past and method can not satisfy economic development, power industry claims and builds electric tower with low-alloy high-strength steel (for example Q420 steel), and require zinc-plated to electric tower parts surface, in case terminate in the erosion of atmosphere and wind and rain to electric tower parts.
Utility model people observes and studies the method and the technology of building electric tower, finds to weld with the electric tower assembly of traditional real core welding welding wire to low-alloy high-strength steel, has two shortcomings at least.First shortcoming be have many welding slags firm be bonded in the commissure, so in the commissure cleaning welding slag and the very difficulty that polishes flat.Second shortcoming is after cleaning welding slag and polishing, and weld seam is still coarse, out-of-flatness, and zinc-plated difficulty, quality of coating is bad.And it is close that the zinc coating thickness that the commissure plates reluctantly and the zinc coating thickness of steel surface are difficult to keep.
The utility model content
The purpose of this utility model provides a kind of after low-alloy high-strength steel is welded, and is suitable for forming in the commissure welding welding wire of dense oxide protective layer.
For realizing above purpose, the utility model is achieved through the following technical solutions:
Be used for the welding welding wire of soldering low alloy high-strength steel, it is characterized in that:
Low-alloy high-strength steel surface and weld seam need plate the protective layer that can form dense oxide;
There is hollow parts at welding welding wire middle part, is used to hold the medicine core;
The ratio of described weight that is rolled into circular steel band and medicine core weight is between 9: 1 to 3: 1.
Another preferred implementation of the present utility model is that the material of forming the welding welding wire is a mild steel.
Another preferred implementation of the present utility model is that the weight of described medicine core accounts for the 10%-25% of whole welding wire total amount.
Another preferred implementation of the present utility model is that described low-alloy high-strength steel comprises Q345, Q390, Q420 and Q460 steel.
Another preferred implementation of the present utility model is to weld formed commissure and be suitable for plating the protective layer that can form dense oxide;
The described protective layer that can form dense oxide is a zinc, and silicon is contained in described commissure, so that zinc-plated protective layer.
Compare with prior art, the advantage of welding welding wire of the present utility model is when low-alloy high-strength steel is welded, and can promote to form the protective layer and the bright and clean face of weld of dense oxide, is easy to zinc-plated.And have better welding operation performance and a spatter still less.
Description of drawings
Figure 1A is the tower-base structure schematic diagram;
Figure 1B is an angle steel connector structural representation;
Fig. 2 is the partial structurtes schematic diagram of steel tube tower;
The steel band schematic diagram that be used for soldering low alloy high-strength steel flux-cored wire of Fig. 3 for using in the utility model;
Fig. 4 is the steel band schematic diagram that is processed to the U type;
Fig. 5 for the steel band notch of U-shaped by the structural representation after closing;
Fig. 6 A is the welding welding wire structural representation behind the drawing forming;
Fig. 6 B is the welding welding wire cross-sectional view in the utility model.
Fig. 7 is the silicone content contrast relationship figure in zinc coating thickness and the steel.
The specific embodiment
Below in conjunction with drawings and Examples the utility model is described in detail:
In present stage, electric tower mainly contains two kinds: a kind of is angle steel electricity tower, by column foot, angle steel (not shown) and angle steel connector, is formed by connecting by bolt; Second kind is steel pipe electricity tower, by column foot, steel pipe and connector of steel tube, is formed by connecting by bolt.
Figure 1A and Figure 1B are for making the schematic diagram of angle steel tower parts, and Figure 1A is column foot 101 structural representations; Figure 1B is angle steel connector 102 structural representations.Column foot 101 and angle steel connector 102 all are to be welded by the polylith steel plate.A plurality of screws 103 are arranged on the column foot 101.A plurality of screws 104 are arranged on the angle steel connector 102, screw 103 and screw 104 all with angle steel on screw match and be connected by bolt.A plurality of column foots, angle steel connector and angle steel use the bolt electric power tower (electric tower) that is connected to capable of being combined.Column foot and angle steel connector be welding, zinc-plated in advance all, after angle steel is zinc-plated in advance, at electric tower the on-the-spot assembling in ground is installed again and gets final product.The electricity tower is high more, and the column foot of use, angle steel connector and angle steel quantity are just many more.In Figure 1A, column foot 101 has weld seam 107 (not marking all weld seams among the figure); In Figure 1B, angle steel connector 102 has weld seam 109 (not marking all weld seams among the figure).So long as just there is weld seam in welding.And mostly each block plate of forming column foot is vertical mutually setting, welds in two block plate contact positions.Each block plate of forming the angle steel connector also is vertical mutually the setting, welds in two block plate contact positions.Therefore, weld seam mainly is to be positioned at the nook that vertically disposed two block plates form, and also causes thus in commissure cleaning welding slag and the inconvenience especially of polishing surface.
Fig. 2 is the partial structurtes schematic diagram of steel tube tower, and (201A is welded with connector of steel tube on 201B...) to trunk steel pipe 201.Connector of steel tube comprise sleeve pipe holder 202 (202A, 202B...) and sleeve pipe 203 (203A, 203B...).Sleeve pipe holder 202A is welded on the steel pipe 201A.Sleeve pipe 203A is connected on the sleeve pipe holder 202A by bolt.When building steel tube tower, with column foot (not shown), trunk steel pipe, steel pipe, fitted bolt is on-the-spot to be installed.Sleeve pipe 203A and sleeve pipe 203B are towards relative, so that straight steel pipe 204 two ends can be inserted respectively in sleeve pipe 203A and the 203B.Many trunk steel pipes, steel pipe, connector of steel tube combinations are installed and are connected to steel tube tower.Trunk steel pipe, connector of steel tube, bolt and steel-tube construction and method of attachment are prior art, do not repeat them here.In Fig. 2, in the partial structurtes schematic diagram of pipe tower weld seam 209 is arranged.
According to traditional electric tower method of construction, each electric tower parts such as column foot, angle steel connector, angle steel, steel pipe, connector of steel tube are all prefabricated, and the electric tower parts that weld are indoor the welding in the workshop, and on-the-spot assembling gets final product in electric tower installation site again.Therefore, needed welding operation all can be finished indoor.When indoor welding, indoor environment is with respect to the field, and welding surroundings is better, and the shape of the commissure of welding assembly is simpler.Traditional electric tower uses conventional strength steel, and welding slag is removed easily.Steel surface and face of weld do not require zinc-plated yet, and solid core welding wire can meet the demands, so in traditional electric tower construction, used welding wire is solid core welding wire.
After electric power tower adopted the Q420 high-strength steel, it is very difficult that the welding slag cleaning becomes, and new electric tower requirement is zinc-plated, removes unclean welding slag and has a strong impact on the weld seam galvanizing quality.And solid core welding wire is to be formed by the direct drawing of the steel wire of steel mill, and the composition adjustment is very limited, can't solve welding slag cleaning and the zinc-plated difficult problem of weld seam.Also there is the zinc-plated difficult problem of weld seam in existing flux-cored wire, but flux-cored wire is because there is the medicine core, the composition adjusting range compares broad, the utility model is exactly by adjusting the medicine core composition of flux-cored wire, solved electric power tower and adopted the welding slag cleaning that occurs behind the Q420 high-strength steel and the problem of the zinc-plated difficulty of weld seam.
Fig. 3-the 6th, the utility model are used for the schematic diagram of soldering low alloy high-strength steel flux-cored wire structure and manufacture method.
Fig. 3 makes the steel band 30 that the utility model is used for soldering low alloy high-strength steel flux-cored wire, and in the utility model, steel band is a mild steel, and the mild steel that sell the existing market all can use.The weight percentage of preferred each component of mild steel meets the demands: C:0.02-0.05%.
More preferably be that other constituent content of mild steel is Si:0.005-0.02%; Mn:0.2-0.4%; S＜0.01%; P＜0.02%; All the other are iron and a small amount of other trace element.
As shown in Figure 4, for the medicine core is entrained in the welding wire, steel band 30 at first is processed to the U type, and the medicine core just can be put into U type groove like this.
The medicine core comprises according to percentage by weight: Mn:5%～20%; Si:1%～15%; TiO
2: 5%～25%; SiO
2: 0.1%～10%; Mo:0.1-5%; All the other are iron.
Described medicine core can also comprise Mg:1%～5% according to percentage by weight; Al:1%～5%.
Preferred implementation is Mn, Si, TiO
2, SiO
2, Mo, Mg and Al the weight content sum be 20%～40%.
The weight of described medicine core accounts for the 10%-25% of whole welding wire total amount.
Above composition, both Mn that can be pure, Si, TiO
2, SiO
2, Mo, Mg and Al form add, also can add with the form of the alloy of several compositions in them.
As shown in Figure 5, the U type notch of steel band 30 is closed, and wraps up in circular.Medicine core 31 is rolled in the steel band 30.
The conglobate steel band 30 of wrapping up in shown in Figure 5 is elongated to circle in wire drawing machine, form the welding wire 60 shown in Fig. 6 A, and medicine core 31 is comprised in welding wire 60 middle parts.Through the wire drawing machine drawing forming, pulling into diameter is the 1.4mm flux-cored wire.Gage of wire also can be changed according to actual instructions for use, as pulls into the flux-cored wire that diameter is 1.6mm, 1.2mm.
Fig. 6 B is the cross sectional representation of the welding wire 60 after the drawing, and medicine core 31 is wrapped in the welding wire middle part by cladding material.Cladding material is a steel band 30 shown in Figure 5.Its cross section is overlap joint.
Each composition weight percentage composition of medicine core among the embodiment 1～27 is as shown in table 1:
Table 1
Adopt the flux-cored wire welding Q420 low-alloy high-strength steel in traditional solid core welding wire (ER60S-G) and the utility model respectively, result of the test is as follows:
When adopting traditional solid core welding wire (ER60S-G) welding Q420 low-alloy high-strength steel, can produce more splashing in welding process, the many welding slags of (deposited metal surface) secure bond in the commissure take off the slag and the very difficulty of polishing all.Need to use special milling tools polishings such as emery wheel, can produce more dust in the bruting process, contaminated environment causes bigger harm to operating personnel's health.When zinc-plated, the surface of welding slag can't plate zinc, and no welding slag place can plate zinc.If that the welding slag place is not zinc-plated, the welding slag place will become the inlet that external environment corrodes, and whole iron tower because the welding slag place is corroded and reduces bearing capacity, causes electric tower to collapse possibly.Even the welding slag of commissure is polished totally fully, because the commissure is coarse, out-of-flatness still can influence galvanizing quality.So, adopt traditional solid core welding wire soldering low alloy high-strength steel that following shortcoming is arranged:
-waste of manpower
-waste metal material
-waste scolder
-generation noise and dust, contaminated environment
-polishing difficulty is big
-galvanizing quality is bad.
When adopting the utility model flux-cored wire welding Q420 low-alloy high-strength steel, in welding process, molten drop excessively becomes injection excessively, it is less to splash, form the thin welding slag of one deck at face of weld, the part welding slag comes off automatically, and last welding slag in the commissure adheres to loosening, need not to adopt special milling tools such as emery wheel, use simple tool to beat and to remove welding slag.Commissure behind the removing welding slag is smooth.After the welding slag cleaning, face of weld can be zinc-plated.And because the acting in the welding process of drug core component, can form in the commissure that to have part by weight be 0.1%～0.4% silicon, help in the commissure zinc-plated.Found through experiments, particularly effective for hot-dip galvanizing technique.The silicone content of commissure deposited metal has been taken into account the mechanical property of deposited metal and to zinc-plated influence.
After testing, find, compare, adopt flux-cored wire soldering low alloy Gao Gang of the present utility model that following advantage is arranged with traditional solid core welding wire:
-saving manpower and cost
-saving metal material
-saving welding wire
-improve working environment
-polishing easily
-improvement galvanizing quality.
Welding welding wire in the utility model, the Al that exists in the medicine core and Fe form alloy, to make that jointly weld seam after the flux-cored wire welding takes off slag easy with Ti.
Flux-cored wire of the present utility model is suitable for flux-cored wire gas shielded arc welding (FCAW) welding method.Protective gas is preferably according to percent by volume by 50%～85%Ar and 15%～50%CO
2The protective gas of forming.Can also only select CO for use in addition
2As protective gas.
When using the flux-cored wire welding in the utility model, (DC+) is as shown in table 2 for the welding current parameter.
Table 2:
The flux-cored wire of choosing among the embodiment 21 welds test, and welding parameter and test result are as shown in table 3.
Table 3
Use the flux-cored wire welding Q420 steel among the utility model embodiment 12, welding manner is downhand welding, and the welding back is measured deposited metal, and the result is as shown in table 4:
Table 4:
Use the flux-cored wire test of the described method of table 4 to embodiment 1-9, the chemical composition of deposited metal (wt%) test result is as shown in table 5.
Table 5:
Use the flux-cored wire test of the described method of table 4 to embodiment 1-9, the The performance test results of deposited metal is as shown in table 6:
Table 6:
Each element wt percentage composition is as shown in table 7 in the steel of the various trades mark:
Table 7
The steel performance index of the various trades mark is as shown in table 8:
Table 8
From the contrast of table 4, table 6 and table 4 as can be seen, no matter be yield strength, tensile strength, or percentage elongation, impact value, the flux-cored wire in the utility model all is suitable for welding the Q420 low-alloy high-strength steel, also can use Q390, Q460, Q345 low-alloy high-strength steel.
Find through test, the selection of the drug core component in the utility model, an effect is that the welding slag of commissure significantly reduced after welding was finished, and the part welding slag comes off automatically, and last welding slag in the commissure adheres to not firm, cleaning easily.And the commissure is smooth, and the weld seam behind the weld cleaning is a glossy surface.Cleaning work ratio before zinc-plated is easier to, and the working environment dust is few, environmental protection, health.
According to the Sandelin effect; when hot dip galvanizing method was zinc-plated, the silicone content in zinc coating thickness and the steel had corresponding relation, as shown in Figure 7 (" material protection "; in August, 2004; the 37th volume, the 8th phase, the 26th page; " interpretation model of the Sheng Delin effect microcosmic mechanism in the galvanizing "; author: car Chun Shan, Lu Jintang etc.), as adopting hot galvanizing method zinc-plated, the content of silicon has great influence to the thickness of coating.Silicone content is very few or too much, and zinc coating thickness all can be very thick.Silicone content was at 0.1%～0.4% o'clock, and zinc coating thickness is optimum.When building electric tower, when steel surface and deposited metal plating zinc on surface, the coating on deposited metal surface can not be too thick, because too thick meeting comes off the zinc protective layer easily, the deposited metal that loses the coating protection is corroded by external environment easily.Therefore, for guaranteeing best galvanizing quality, first must guarantee that the thickness of zinc protective layer is suitable; The zinc protective layer of second commissure (being the deposited metal surface) should be close with the zinc protective layer thickness of steel surface; Therefore, the silicone content in the deposited metal need be close with the silicone content in the steel.Under silicone content in the deposited metal situation close with the silicone content in the steel, the zinc-plated thickness on thickness that steel surface is zinc-plated and deposited metal surface is close.Silicon weight content in the Q420 steel standard criterion is smaller or equal to 0.55%.The Q420 steel of actual production, silicone content is generally 0.3～0.4%.
Find through test, the selection of composition in the utility model medicine core, another effect be after welding, make the deposited metal of commissure contain silicon, and the silicon weight content in the deposited metal is close with the silicone content in the Q420 steel.Therefore can promote zinc-platedly, can guarantee that again the zinc protective layer thickness of the zinc protective layer thickness of commissure and steel surface is close in the commissure.During flux-cored wire in the utility model welding Q420 steel, the silicone content part by weight 0.1%～0.4% in the deposited metal is close with silicone content in the Q420 steel.
Through test, drug core component of the present utility model is to the scarfing cinder of Q420 low-alloy high-strength steel, zinc-plated having better effect; To the scarfing cinder of Q345, Q390 and Q460 low-alloy high-strength steel, zinc-plated also have an improvement effect.
The zinc laminar surface that is plated in the low-alloy high-strength steel surface forms compactness zinc oxide protective layer, prevents that zinc layer inside is oxidized, zinc oxide is difficult for being corroded by external environment, can play protection zinc layer inside and steel, deposited metal, prevents that electric tower parts from getting rusty.
Zinc-plated described in the utility model can adopt hot dip galvanizing method.The selection of process for plating and Zinc material is prior art.Butt welded seam zinc-plated and all can be identical at steel surface zinc-plated process for plating and employed material.
Medicine cored welding wire of the present utility model has obvious improvement to the building course of building electric tower with low-alloy high-strength steel (as the Q420 steel), is example to build angle steel electricity tower, and process is as follows:
Below be that example describes to build angle steel electricity tower:
Fig. 3 makes the steel band 30 that the utility model is used for the low-alloy high-strength steel flux-cored wire, and in the utility model, the material of steel band is a mild steel.
As shown in Figure 4, for the medicine core is entrained in the welding wire, steel band 30 at first is processed to the U type, and the medicine core just can be put into U type groove like this.
As shown in Figure 5, the U type notch of steel band 30 is closed, and wraps up in circular.Medicine core 31 is rolled in the steel band 30.The component of medicine core is prepared according to embodiment 1-27.
Shown in Figure 5 wrap up in conglobate steel band 30 and be elongated after, form the welding wire 60 shown in Fig. 6 A, medicine core 31 is comprised in welding wire 60 middle parts.Through welding wire machine drawing forming, pulling into diameter is the 1.4mm flux-cored wire.Gage of wire also can be changed according to actual instructions for use, as pulls into the flux-cored wire that diameter is 1.6mm, 1.2mm.
Fig. 6 B is the cross sectional representation of the welding wire 60 after the drawing, and medicine core 31 is comprised in the welding wire middle part.Its cross section is overlap joint.
Use welding welding wire described in the utility model that the polylith steel plate is welded into a plurality of column foots shown in Figure 1A, angle steel connector shown in Figure 1B.After the welding, the welding slag of commissure is cleaned out, to column foot, angle steel connector and angle steel plating zinc on surface.After zinc-plated the finishing, it is on-the-spot with column foot, angle steel connector and angle steel assembling becoming angle steel electricity tower at electric tower ground to be installed.
Method of the present utility model also can be used to build steel pipe electricity tower.
Embodiment in the utility model only is used for the utility model is described, and does not constitute the restriction to the claim scope, and other substituting of being equal in fact that those skilled in that art can expect are all in the utility model protection domain.
Claims (2)
1. a welding welding wire that is used for the soldering low alloy high-strength steel is used for the soldering low alloy high-strength steel, on the low-alloy high-strength steel surface and weld seam need plate the protective layer that can form dense oxide, it is characterized in that: described welding welding wire comprises:
Be rolled into circular steel band, there is free heart part at its middle part, is used to hold the medicine core;
The ratio of described weight that is rolled into circular steel band and medicine core weight is between 9: 1 to 3: 1.
2. the welding welding wire that is used for the soldering low alloy high-strength steel according to claim 1 is characterized in that:
The material of forming the welding welding wire is a mild steel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202674554U CN201889596U (en) | 2009-10-21 | 2009-10-21 | Welding wire for welding low-alloy high-strength steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202674554U CN201889596U (en) | 2009-10-21 | 2009-10-21 | Welding wire for welding low-alloy high-strength steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102500892A (en) * | 2010-11-17 | 2012-06-20 | 天津电力建设公司 | Micro-alloying TMCP (Thermal Mechanical Control Processing) Q460 steel FCAW (Flux Cored Arc Welding) welding method |
-
2009
- 2009-10-21 CN CN2009202674554U patent/CN201889596U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102500892A (en) * | 2010-11-17 | 2012-06-20 | 天津电力建设公司 | Micro-alloying TMCP (Thermal Mechanical Control Processing) Q460 steel FCAW (Flux Cored Arc Welding) welding method |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110706 Termination date: 20161021 |
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| CF01 | Termination of patent right due to non-payment of annual fee |