CN101658987A

CN101658987A - Flux-cored wire

Info

Publication number: CN101658987A
Application number: CN200910018832A
Authority: CN
Inventors: 蒋立华; 郭林
Original assignee: SHANDONG SINO-STRONG GROUP Co Ltd
Current assignee: SHANDONG SINO-STRONG GROUP Co Ltd
Priority date: 2009-09-14
Filing date: 2009-09-14
Publication date: 2010-03-03
Anticipated expiration: 2029-09-14
Also published as: CN101658987B

Abstract

The invention discloses a flux-cored wire comprising a sheet steel and powder. The powder is prepared by mixing the following components by weight percent: 21-30 percent of rutile, 1-2 percent of wollastonite, 10-21 percent of silicon manganese alloy, 7-11 percent of iron powder, 2-3 percent of nickel powder, 7-9 percent of feldspar, 0.5-1.5 percent of silicon zirconium iron, 2-6 percent of sodiumfluoride, 6-7 percent of ferro molybdenumn, 1-3 percent of ferric oxide, 6-7 percent of mid-carbon fe-mn, 1-3 percent of sodium carbonate, 2-4 percent of magnesite, 6-7 percent of quartz, 0.5-2 percent of fluorite, 0.1-0.5 percent of bismuth oxide, 1.5-3 percent of aluminum magnesium alloy and 0.5-2 percent of ferrotitanium. The invention is little in splashing and easy to detach slag, has stableelectric arc, no punctiform dents and favorable surface quality and can improve the bearing capacity of welding lines.

Description

A kind of flux-cored wire

Technical field

The present invention relates to the welding material of metal technical field, relate in particular to a kind of flux-cored wire that is used for heat resisting steel.

Background technology

The metal material that uses of working under industrial high temperature conditions such as power, oil and chemical industry generally is a heat resisting steel.Because it not only has good non-oxidizability and heat resistance, also has the performance of reasonable anti-sulfuric acid and anti-hydrogen-type corrosion, so more and more used.Have manual electric arc welding, submerged-arc welding, gas metal-arc welding and TIG that the welding method of this class steel is commonly used weld, and flux-cored wire is to coat medicinal powder by steel band, through product rolling, that draw becomes.Usually traditional flux-cored wire must use mist as protective gas in use, and with moving that the stability that guarantees arc and metal drip, but mist is wayward, therefore makes the environment for use of traditional flux-cored wire be restricted.If adopt 100%CO ₂Gas shielded arc welding, it is bigger then to exist welding process to splash, and is not easy to take off slag, the electric arc instability, the oxygen content of weld metal increases, defectives such as weld metal toughness reduction.In addition; existing flux-cored wire is owing to the medicinal powder of its coating is restricted; arc protection atmosphere deficiency; therefore there is the point-like load mould in weld metal surface, welding back; especially can be more serious when extensive welding, make face of weld not attractive in appearance, even can cause stress to concentrate; destroy the bearing capacity of weld seam, the face of weld quality problems are serious.

Summary of the invention

Technical problem to be solved by this invention provide a kind of not only have splash little, take off slag easily, arc stability, no point-like load mould, surface quality is good, and can strengthen the flux-cored wire of the bearing capacity of weld seam.

For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of flux-cored wire, comprise sheetmetal and medicinal powder, and described medicinal powder is mixed by each component of following percentage by weight:

Rutile 21%-30%, wollastonite 1%-2%, silicomangan 10%-21%, iron powder 7%-11%, nickel powder 2%-3%, feldspar 7%-9%, silicon ferrozirconium 0.5%-1.5%, sodium fluoride 2%-6%, molybdenum-iron 6%-7%, iron oxide 1%-3%, mid-carbon fe-mn 6%-7%, sodium carbonate 1%-3%, magnesia 2%-4%, quartzy 6%-7%, fluorite 0.5%-2%, bismuth oxide 0.1%-0.5%, almag 1.5%-3%, ferrotianium 0.5%-2%.

As a kind of improvement, the best proportioning of each component is in its traditional Chinese medicine powder:

Rutile 26%, wollastonite 1.5%, silicomangan 17%, iron powder 8%, nickel powder 2.5%, feldspar 8%, silicon ferrozirconium 1%, sodium fluoride 5%, molybdenum-iron 6%, iron oxide 2%, mid-carbon fe-mn 7%, sodium carbonate 2%, magnesia 3%, quartz 6%, fluorite 1.25%, bismuth oxide 0.25%, almag 2.25%, ferrotianium 1.25%.

As further improvement, the granularity of each component of described medicine core powder is to pass through 60-70 purpose sieve.

The performance of each raw material components is as follows:

Rutile: it uses as slag former, and the addition of strict control slag former can attenuate postwelding skull, helps the effusion of gas in the molten bath, reduces pore quantity, improves the deposition rate of welding wire;

Wollastonite: mainly play fluxing effect, can also adjust viscosity, fusing point, surface tension and the flowability of slag;

Silicomangan: add an amount of element silicon in the prescription and help to improve appearance of weld;

Iron powder: the addition of iron powder increases can help to improve deposition efficiency, the pore that occurs when reducing on band priming paint steel plate high speed fillet welding and the quantity of pit;

Nickel powder: can be to the weld metal transition alloy elements by nickel powder;

Feldspar: use mainly as slag former, can regulate the physical and chemical performance of slag, owing to also contain K ₂O and Na ₂O helps to improve arc-stabilising;

Silicon ferrozirconium: can be used as deoxidier and fining agent, can promote the refinement of slag, thereby prevent the appearance of surface crater;

Sodium fluoride: can reduce the dividing potential drop of hydrogen in the arc zone, the appearance of opposing pore, and the existence of sodium element can also be burnt by stable arc;

Molybdenum-iron: to the weld metal transition alloy elements;

Iron oxide: add the polishing performance that an amount of iron oxide can improve slag in the prescription;

Mid-carbon fe-mn: add an amount of mid-carbon fe-mn in the prescription and help to improve toughness and plasticity;

Sodium carbonate: the adding of sodium carbonate can improve stability;

Magnesia: the adding of magnesia mainly plays fluxing effect, and the refinement molten drop improves viscosity coefficient of dross;

Quartzy: mainly be the physical and chemical performance of adjusting slag, the effect of the basicity of its slag making and reduction slag;

Fluorite: be mainly used in slag making and improve the physical and chemical performance of slag;

Bismuth oxide: be a kind of effective and economic catalysis material that is used for oxidation reaction;

Almag: an amount of magnadure of adding helps to reduce the oxygen content in the weld metal in the prescription, is beneficial to the improvement of weld metal toughness;

Ferrotianium: can crystal grain thinning by ferrotianium, utilize the improvement of weld metal toughness.

After having adopted technique scheme, the beneficial effect that the present invention obtains is: the present invention adopts rutile, feldspar, sodium fluoride and adds prescription with larger proportion, can improve welding technological properties, and it has at CO ₂When protection is used down full the position connect welding, arc stability is good, it is few to splash, taking off easy and droplet transfer of slag is advantages such as spray transfer; Have good non-oxidizability and heat resistance, and improved metal toughness; In addition, form, solved the problem of face of weld load mould, prove that through application test it is easy to take off slag by adjusting medicinal powder, arc stability, face of weld moulding light, smooth, no point-like load mould, surface quality is good, has strengthened the bearing capacity of weld seam.

The specific embodiment

Embodiment one:

A kind of flux-cored wire comprises sheetmetal and medicinal powder, and wherein, described medicinal powder is mixed by each component of following percentage by weight:

Rutile 27%, wollastonite 1%, silicomangan 19%, iron powder 10.5%, nickel powder 2%, feldspar 8%, silicon ferrozirconium 0.5%, sodium fluoride 4.5%, molybdenum-iron 6.5%, iron oxide 1.5%, mid-carbon fe-mn 6.5%, sodium carbonate 1%, magnesia 2%, quartz 6%, fluorite 0.5%, bismuth oxide 0.1%, almag 2.5%, ferrotianium 0.9%.

Elder generation screens the granularity of the powder of above-mentioned weight proportion by 60 purpose sieves, the powder of each component is put into mixed powder machine mixing 40 minutes then, then mixed-powder is added in the U-lag of mild-carbon steel strip; U type groove is healed up, make the medicinal powder parcel wherein; Pursue road drawing, tube reducing by wire drawing machine then, make its diameter reach setting at last, thereby realize flux-cored wire of the present invention.

Embodiment two:

Other and embodiment one are basic identical, and its difference is: the percentage by weight of each component is in the medicinal powder:

Embodiment three:

Other and embodiment one are basic identical, and its difference is:

Rutile 27%, wollastonite 2%, silicomangan 15%, iron powder 8.5%, nickel powder 3%, feldspar 8%, silicon ferrozirconium 1.5%, sodium fluoride 2.5%, molybdenum-iron 6.5%, iron oxide 2.5%, mid-carbon fe-mn 7%, sodium carbonate 1.5%, magnesia 3.5%, quartz 6.5%, fluorite 1.5%, bismuth oxide 0.3%, almag 1.7%, ferrotianium 1.5%.

Claims

1. a flux-cored wire comprises sheetmetal and medicinal powder, and described medicinal powder is mixed by each component of following percentage by weight:

2. a kind of flux-cored wire according to claim 1 is characterized in that: the best proportioning of each component is in its traditional Chinese medicine powder:

3. a kind of flux-cored wire according to claim 2 is characterized in that: the granularity of each component of described medicine core powder is for can pass through 60-70 purpose sieve.