CN109454361A - A kind of low-hygroscopicity submerged-arc welding sintered flux and preparation method thereof - Google Patents

Abstract

The present invention relates to a kind of low-hygroscopicity submerged-arc welding sintered fluxes and preparation method thereof, by weight percentage: fluorite 13-28%, bauxite 16-20%, magnesia 20-28%, marble 28-45%, wollastonite 17-20%, rutile 3-6%, zircon sand 0.1-1.2%, polyvinyl alcohol 3-6%, chrome green 1.2-3.6%, sodium carbonate 2-8%, metallic nickel 3-6%, manganese metal 2-5%, rare earth oxide 1-3%；By to solder flux slag system adjustment, in the way of weld seam alloy transition and the improvement of manufacturing process, provide a kind of submerged-arc welding sintered flux that low-hygroscopicity low-temperature impact toughness is excellent.

Description

A kind of low-hygroscopicity submerged-arc welding sintered flux and preparation method thereof

Technical field

The present invention relates to a kind of sintered flux used for submerged arc welding, in particular to a kind of low-hygroscopicity submerged-arc welding sintered flux and its Preparation method.

Background technique

Sintered flux superior performance, it is also more and more extensive to its research and application at present, but due to its ingredient and structure Feature, strong moisture absorption tendency of the sintered flux in manufacture, storage and use process is the weight for for many years hindering it to promote and apply Want factor.

The anti-moisture absorption of sintered flux can not show a candle to fysed flux, and the manufacturing process of the two is different, thus with different micro- Structure and performance are seen, fysed flux passes through high melt, and solder surface has coated one layer of fine and close glass state material, has been effectively isolated The effect of moisture and solder flux.

Sintered flux uses the sintering process of lower temperature, although gradually densifying by high temperature mass transport process, leads to The intensity and consistency of sintered flux particle are still undesirable in normal situation, have biggish specific surface area, institute in flux constituent The effect of the easy moisture absorbing component and vapor that contain is strong, and moisture absorption tendency is big, and the easily broken dusting of flux particle；Therefore sintering weldering The anti-moisture absorption of agent is poor, is the inherent shortcoming of itself；It is external at present in its manufacture in order to improve the anti-moisture absorption of sintered flux Optimized Measures are taken in technique, i.e., sintered flux are put in CO₂Atmosphere in be sintered, although there is certain effect, the sintering The cost of technique is excessively high.

The strong moisture absorption tendency of sintered flux, which is used for performance and processing performance, very big harm, when sintered flux stores Condition or stoving process are unqualified, and moisture therein is difficult to eliminate, so that the metallurgical reaction of weld metal in welding process is participated in, Increase the content of diffusible hydrogen in weld seam, endangers the toughness of weld seam, meanwhile, in the welding process under hot conditions, in solder flux In conjunction with water will sharply evaporate, the vapor of formation generates the effect of power to the welding pool of melting, is easy to produce weight water The phenomenon that, so that the formability of weld seam is deteriorated；In addition, being also easy to produce the powder phenomenon-tion of flux particle after sintered flux moisture absorption, this is not So that the pine dress ratio of solder flux is changed, influences the gas permeability in the dosage and welding process of solder flux, while the dusting of particle is led It causes the fluctuation of flux constituent to increase, and then influences the inhomogeneities of composition of weld line；In order to reduce the strong moisture absorption tendency of sintered flux Harm, it is necessary to control its condition of storage to reduce directly contacting for solder flux and vapor, improve drying temperature and soaking time with Remove the moisture adsorbed as far as possible, at the same dry the solder flux after be prevent again the moisture absorption cannot place for a long time, these measures Largely affect the service performance and welding procedure cost of sintered flux.

In addition, as submerged arc sintered flux is using more and more extensive, especially in corrosive environment application, it is desirable that The weld seam that submerged arc sintered flux is formed not only needs enough obdurabilities that has of welding point, also to there is enough corrosion resistances Can, current domestic sintered flux, for how to improve the low-temperature impact toughness of deposited metals, there is presently no very direct sides Method.

Summary of the invention

The present invention, which overcomes prior art sintered flux to be easy the moisture absorption, leads to weld seam hydrogen content height, weld seam low-temperature impact toughness not The defect of foot, by solder flux slag system adjustment, in the way of weld seam alloy transition and the improvement of manufacturing process, provide A kind of submerged-arc welding sintered flux and preparation method thereof that low-hygroscopicity low-temperature impact toughness is excellent.

A kind of low-hygroscopicity submerged-arc welding sintered flux, by weight percentage: fluorite 13-28%, bauxite 16-20%, Magnesia 20-28%, marble 28-45%, wollastonite 17-20%, rutile 3-6%, zircon sand 0.1-1.2%, polyvinyl alcohol 3-6%, Chrome green 1.2-3.6%, sodium carbonate 2-8%, metallic nickel 3-6%, manganese metal 2-5%, rare earth oxide 1-3%.

Further, sintered flux ingredient are as follows: fluorite 18-28%, bauxite 17-20%, magnesia 20-28%, marble 28-30%, wollastonite 17-20%, rutile 3-6%, zircon sand 0.1-1.2%, polyvinyl alcohol 3-6%, chrome green 1.2-3.6%, carbonic acid Sodium 2-8%, metallic nickel 3-6%, manganese metal 2-3%, rare earth oxide 1-2%.

Fluorite: CaF₂>=94%, SiO₂≤ 4.0%, S≤0.04%, P≤0.04%；Magnesia: MgO >=96%, SiO₂≤ 1.5%, S ≤ 0.04%, P≤0.04%；Aluminium vanadine: Al₂O₃>=85%, CaO≤0.6%, SiO₂≤ 10%, TiO₂≤ 4.5%, S≤0.06%, P≤ 0.06%；Wollastonite: CaO:40%-50%, SiO₂: 48%-52%；Rutile: TiO₂>=87.0%, S≤0.04%, P≤0.04%；Zirconium Sand: ZrO₂>=60%, SiO₂>=25%, C≤0.1%, S≤0.05%, P≤0.05%；Metallic nickel: Ni >=99.9%, C≤0.02%, S ≤ 0.005%, P≤0.01%, granularity: 200 mesh；Manganese metal: Mn >=99.9%, C≤0.02%, S≤0.005%, P≤0.01%, grain Degree: 200 mesh；

CaF₂It is a kind of basic anhydride, slag former, diluent is belonged in solder flux, decomposes in welding reaction (1) CaF₂+H₂0- → CaO+2HF, CaF₂+ [H] → CaF+HF, CaF₂+ 2H → Ca+2HF generates hydrogenation more stable at high temperature Object HF and [OH], they do not dissolve in liquid steel, drastically reduce the content in steel, CaF₂+[O]→CaO+2[F]；[F] generated is caught [O] that reduction reaction generates in slag is caught, inhibits [O] transition into deposited metal, so that [O] oxygen reduced in deposited metal contains Amount, improves the plasticity and toughness of weld seam；The content for increasing CaF2 in flux constituent can be effectively reduced slag and the hydrogen in molten bath Content improves its porosity resistance ability, CaF₂The viscosity of slag can be reduced, conducive to the diffusion of S2-, is more likely formed volatile matter SF6, into And be conducive to desulfurization.

SiO₂Be a kind of acidic materials, reduce the basicity of solder flux, in solder flux with CaF₂It is reasonably combined, using high SiO₂With Low CaF₂Proportion or high CaF₂With low SiO₂, weld seam can be made to have excellent porosity resistance ability；SiO2 participates in slag making, adjusts slag Freezing point, surface tension and high temperature viscosity, it is extremely important to the control of appearance of weld；But SiO in solder flux₂Too high levels easily cause Welding wire scaling loss is excessive, the serious basicity for reducing solder flux, is that the Si that returns of weld seam increases, low-temperature impact toughness decline；In addition SiO₂With The compound of adjustable slag fluidity is produced under CaO high temperature.

MgO is a kind of strong basicity oxide and a kind of good slag former, 2852 DEG C of fusing point, 3600 DEG C of boiling point, and in alkali Property slag system in, it can be improved the impact flexibility of weld metal, reduce diffusible hydrogen content；But its fusing point is excessively high, will increase molten Slag viscosity improves the setting temperature of slag, reduces the mobility of slag；The forming and the removability of slag that will affect weld seam too much is added；? It can be used for reducing CaF when melt tank reaction₂And SiO₂React the SiF generated₄Deng its body, electric arc is prevented, stablize electricity to reach The effect of arc；If light magnesium oxide is added in solder flux, advantageously reduces the specific surface area of face of weld and then reduce weld seam Moisture absorption amount.

CaO is stable basic anhydride, is the main slag former of high-basicity sintered flux, slag making is played in solder flux and is mentioned The effect of high flux basicity, it can effectively improve the ability of solder flux heavy current, in melt tank reaction with the binding ability of S, P It is relatively strong, the content of S, P in weld metal can be excluded；But the Al value due to CaO and metal Al value are very close, it is in high-temperature liquid The rainy surface layer of state forms dentation coupling, extends the time that slag and liquid metal coexist, strong influence appearance of weld and de- slag Property；CaO is easily and SiO₂Form CaO(SiO₂) n multicomponent complex, reduce the activity of CaO, improve the al value of slag, effectively change The kind removability of slag.

A1₂O₃It is amphoteric oxide, 2050 DEG C of fusing point, 3000 DEG C of boiling point, as vitreum slag making material common in solder flux Material has the function of adjusting slag conductivity, improves electric arc centrality；A1₂O₃It is the regulator of viscosity coefficient of dross, slag can be adjusted Mobility, have the function of increasing slag surface tension, A1 in solder flux₂O₃The more, weld seam fish scale ripple is thinner for content increase It is small, take off slag more be easy, but it is excessively high can make to be also easy to produce stomata and point in weld seam, skull is hardened, influence appearance of weld and quality, A1₂O₃Content is too low and keeps face of weld uneven, influences to shape.

TiO₂Addition can reduce the fusion temperature of weld seam slag, and then improve the mobility of slag, promote weld metal In reduzate assemble and be rejected in slag, facilitate eliminate gas pore in weld metal.

ZrO₂Two kinds of crystal types from high temperature to low temperature change when, i.e., by quadratic crystal to monoclinic crystal transformation when, The linear expansion coefficient of adjustable solder flux and base material improves the removability of slag of weld seam, and high alkalinity solder flux is particularly evident.

Polyvinyl alcohol (PVA) is a kind of common strength organic adhesive, has good cementability and film forming, nontoxic The features such as pollution-free, cheap, easy to use, PVA as bonding agent in use, a certain amount of PVA powder is dissolved in Heating stirring is to whole dissolutions in the distilled water of certain temperature, and adhesive effect is best when solubility is 3.5 ~ 4.5%, when being heated to 200 DEG C or more when, organic principle therein will decompose, and being granulated to the bonding of sintered flux powder has good adaptability.

Ni is infinitely solid-solution in γ-Fe, is the element for expanding γ phase region, the effect of Ni is similar to Mn, only the effect compared with Mn It is weak, it is weak alloying element within the scope of the entire cooling velocity of weld metal, Ni can be such that phase transition temperature reduces, and make Ferrite side plate starts transition temperature reduction degree and is significantly greater than the reduction that AF starts transition temperature；If containing in weld metal When Mn, this effect of Ni is conducive to the formation of AF, in addition, Ni can reduce dislocation motion drag in dot matrix and dislocation and gap Elemental interactions energy promotes stress relaxation, to reduce brittle fracture tendency.

A kind of preparation method of low-hygroscopicity submerged arc sintered flux:

1) ingredient: ingredient weighs up required raw material by formula respectively on an electronic balance and is placed in same container, various mineral powders The sum of last mass fraction is 100%；Configuration PVA bonding agent: the PVA powder of certain mass is accurately weighed, is slowly added into 20 It is dissolved in DEG C cold water, while being stirred continuously makes it sufficiently be swollen, disperse in cold water and the evolution of volatile materials, then 95 DEG C of acceleration dissolutions are warming up to, and keep the temperature 2 ~ 2.5 hours, until solution no longer contains molecule, which is 4%；

2) dry-mixed: the ingredient that will have been prepared in container crosses 40 meshes, then stirs several minutes, is uniformly mixed each pulvis；

3) wet mixing: being added suitable PVA bonding agent during stirring sintered flux powder, and carry out uniformity stirring, control The size for making the speed and additional amount that are added, prevents agglomeration or cementability inadequate, is granulated with facilitating；

4) be granulated: being granulated by the hand rubbing comminution granulation that is sieved, by the wet feed stirred evenly in 12 mesh sieve rubbing granulating back and forth；So It is dried afterwards in ventilation, removes moisture extra in wet feed；

5) low temperature drying: the main purpose of drying is the attached water for evaporating wet feed particle surface, removes in solder flux 99% moisture； Drying temperature controls the speed that heating is controlled at 180 DEG C ~ 200 DEG C in 20 DEG C/h, the excessively high possible agglomeration of heating rate；

6) it is sintered: the sintered flux particle after drying being placed on temperature and is set as being sintered 2 hours in 800 DEG C of furnace, in sintering process Temperature rise speed be 10 DEG C/min, the oxygenolysis of organic adhesive occurs during the sintering process for particle, and the crystal form of oxide turns Become；

7) sieve: the solder flux sintered passes through the sieve of 12 ~ 60 mesh, and removal is excessive and crosses little particle.

The beneficial effects of the present invention are:

In order to replace use of the potassium-sodium water glass of high-hygroscopicity in sintered flux, organic adhesive polyvinyl alcohol is chosen (PVA) it is granulated for the bonding of sintered flux powder, and suitable chrome green and Na2CO3 is added as complex sintered into formula Agent, during high temperature sintering, organic adhesive starts slowly to decompose at 200 DEG C or more, with the rising of temperature, chromium and titanium Solid solution reaction will occur with sinter for ion, and point defect solubility will significantly increase, and crystal, which is distorted activation, to be made in sintering process Mass transfer more rapidly carry out, at 600 DEG C, Na2CO3 melt and there is liquid phase, the rearrangement of particle and densification process will more hold It easily carries out, so that the consistency of sintered flux particle and intensity is able to satisfy requirement, while there is lower hygroscopicity；It closes Golden ingredient reduces the S content of weld metal as desulfurizing agent, improves the ability of the anti-H2S corrosion of welding point；Help to change simultaneously The distributional pattern of kind field trash containing S (mainly MnS and FeS), is allowed to nodularization to improve the low-temperature impact toughness of connector.

Detailed description of the invention

Fig. 1 is welding structure schematic diagram of the present invention.

Specific embodiment

Combined with specific embodiments below, the present invention is furture elucidated；It should be understood that these embodiments are merely to illustrate the present invention Rather than the claimed range of the limitation present invention；It will further be understood that read the content lectured of the present invention it Afterwards, those skilled in the art can make various changes or modification to the present invention, and such equivalent forms are equally fallen within appended by the application Claims limited range.

The processing performance soldering test of sintered flux uses ZD5-1000 automatic submerged arc welding machine, and the source of welding current uses when experiment Be DC reverse connection and constant voltage mode.

Plate used in technological experiment is Q235B steel plate, and specification is 250mm × 100mm × 20mm, and polishing is needed to derust before weldering； Welding wire used is H08A, diameter 4.0mm.

Submerged welding process parameter mainly includes weldingvoltage, electric current, speed of welding, dry extension of electrode degree；Setting is reasonable Submerged welding process parameter has a major impact the craftsmanship of submerged-arc welding；Technological parameter refers to GB12470-90 " low-alloy steel submerged arc Weldering use solder flux " in welding parameter, while pass through multiple welding.

Embodiment one

The preparation method of low-hygroscopicity submerged arc sintered flux:

1) ingredient: ingredient weighs up required raw material by formula respectively on an electronic balance and is placed in same container, various mineral powders The sum of last mass fraction is 100%；Sintered flux component are as follows: fluorite 18-28%, bauxite 17-20%, magnesia 20-28%, Dali Stone 28-30%, wollastonite 17-20%, rutile 3-6%, zircon sand 0.1-1.2%, polyvinyl alcohol 3-6%, chrome green 1.2-3.6%, carbon Sour sodium 2-8%, metallic nickel 3-6%, manganese metal 2-3%, rare earth oxide 1-2%；Configuration PVA bonding agent: certain mass is accurately weighed PVA powder, be slowly added into 20 DEG C of cold water and dissolved, at the same be stirred continuously make its in cold water sufficiently swelling, The evolution of dispersion and volatile materials is then warming up to 95 DEG C of acceleration dissolutions, and keeps the temperature 2 ~ 2.5 hours, until solution no longer contains There is molecule, which is 4%；

2) dry-mixed: the ingredient that will have been prepared in container crosses 40 meshes, then stirs several minutes, is uniformly mixed each pulvis；

3) wet mixing: being added suitable PVA bonding agent during stirring sintered flux powder, and carry out uniformity stirring, control The size for making the speed and additional amount that are added, prevents agglomeration or cementability inadequate, is granulated with facilitating；

4) be granulated: being granulated by the hand rubbing comminution granulation that is sieved, by the wet feed stirred evenly in 12 mesh sieve rubbing granulating back and forth；So It is dried afterwards in ventilation, removes moisture extra in wet feed；

5) low temperature drying: the main purpose of drying is the attached water for evaporating wet feed particle surface, removes in solder flux 99% moisture； Drying temperature is controlled at 180 DEG C ~ 200 DEG C, and the speed to heat up cannot be too fast, and at 20 DEG C, the excessively high possibility of heating rate is tied for control Block；

6) it is sintered: the sintered flux particle after drying being placed on temperature and is set as being sintered 2 hours in 800 DEG C of furnace, in sintering process Temperature rise speed be 10 DEG C/min, the oxygenolysis of organic adhesive occurs during the sintering process for particle, and the crystal form of oxide turns Become, the exclusion of constitution water, the effect etc. between the decomposition and agglutinant and sinter of carbonate is reacted；

7) sieve: the solder flux sintered passes through the sieve of 12 ~ 60 mesh, and removal is excessive and crosses little particle；Flux particle greatly cannot very much Isolation air conservation weld seam very well, causes alloy transfer bad, and the too small then gas permeability of flux particle is bad, and dust is excessive, And cause weld seam slag inclusion；Test solder flux is then made according to above-mentioned steps.

Shown in welding structure schematic diagram 1, welding condition are as follows: weldingvoltage 28-32V, welding current 420-500A, Speed of welding is 26-30m/h, dry extension of electrode 25-35mm.

It is tensile strength is 623Mpa, elongation percentage 26.3% by electronic universal tester measurement weld properties；Through Cross the 250 DEG C of * 2h drying of diffusible hydrogen test structure, diffusible hydrogen content 5.5ml/100g；- 20 DEG C of impact absorbing energy is 146J.

Embodiment two

The preparation method of low-hygroscopicity submerged arc sintered flux:

1) ingredient: ingredient weighs up required raw material by formula respectively on an electronic balance and is placed in same container, various mineral powders The sum of last mass fraction is 100%；Sintered flux component are as follows: fluorite 13-28%, bauxite 17-18%, magnesia 20-28%, Dali Stone 28-30%, wollastonite 17-20%, rutile 3-6%, zircon sand 0.1-1.2%, polyvinyl alcohol 3-6%, chrome green 1.2-3%, carbonic acid Sodium 2-4%, metallic nickel 3-6%, manganese metal 2-3%, rare earth oxide 1%；Configuration PVA bonding agent: the PVA of certain mass is accurately weighed Powder is slowly added into 20 DEG C of cold water and is dissolved, at the same be stirred continuously so that it is sufficiently swollen, dispersed in cold water and The evolution of volatile materials is then warming up to 95 DEG C of acceleration dissolution, and keeps the temperature 2 ~ 2.5 hours, until solution no longer contain it is small Particle, the solution solubility are 4%；

2) dry-mixed: the ingredient that will have been prepared in container crosses 40 meshes, then stirs several minutes, is uniformly mixed each pulvis；

3) wet mixing: being added suitable PVA bonding agent during stirring sintered flux powder, and carry out uniformity stirring, control The size for making the speed and additional amount that are added, prevents agglomeration or cementability inadequate, is granulated with facilitating；

4) be granulated: being granulated by the hand rubbing comminution granulation that is sieved, by the wet feed stirred evenly in 12 mesh sieve rubbing granulating back and forth；So It is dried afterwards in ventilation, removes moisture extra in wet feed；

5) low temperature drying: the main purpose of drying is the attached water for evaporating wet feed particle surface, removes in solder flux 99% moisture； Drying temperature is controlled at 180 DEG C ~ 200 DEG C, and the speed to heat up cannot be too fast, and control is advisable at 20 DEG C, and heating rate is excessively high can It can agglomeration；

6) it is sintered: the sintered flux particle after drying being placed on temperature and is set as being sintered 2 hours in 800 DEG C of furnace, in sintering process Temperature rise speed be 10 DEG C/min, the oxygenolysis of organic adhesive occurs during the sintering process for particle, and the crystal form of oxide turns Become, the exclusion of constitution water, the effect etc. between the decomposition and agglutinant and sinter of carbonate is reacted；

7) sieve: the solder flux sintered passes through the sieve of 12 ~ 60 mesh, and removal is excessive and crosses little particle；Flux particle greatly cannot very much Isolation air conservation weld seam very well, causes alloy transfer bad, and the too small then gas permeability of flux particle is bad, and dust is excessive, And cause weld seam slag inclusion；Test solder flux is then made according to above-mentioned steps.

Shown in welding process schematic diagram 1, welding condition are as follows: weldingvoltage 28-32V, welding current 420-500A, Speed of welding is 26-30m/h, dry extension of electrode 25-35mm.

It is tensile strength is 631Mpa, elongation percentage 25.4% by electronic universal tester measurement weld properties；Through Cross the 250 DEG C of * 2h drying of diffusible hydrogen test structure, diffusible hydrogen content 5.8ml/100g；- 20 DEG C of impact absorbing energy is 151J.

Embodiment three

The preparation method of low-hygroscopicity submerged arc sintered flux:

1) ingredient: ingredient weighs up required raw material by formula respectively on an electronic balance and is placed in same container, various mineral powders The sum of last mass fraction is 100%；Sintered flux component are as follows: fluorite 13-26%, bauxite 17-18%, magnesia 20-28%, Dali Stone 28-45%, wollastonite 17-19%, rutile 3-5%, zircon sand 0.1-1.2%, polyvinyl alcohol 3-6%, chrome green 1.2-3%, carbonic acid Sodium 2-4%, metallic nickel 3-4%, manganese metal 2-3%, rare earth oxide 1%；Configuration PVA bonding agent: the PVA of certain mass is accurately weighed Powder is slowly added into 20 DEG C of cold water and is dissolved, at the same be stirred continuously so that it is sufficiently swollen, dispersed in cold water and The evolution of volatile materials is then warming up to 95 DEG C of acceleration dissolution, and keeps the temperature 2 ~ 2.5 hours, until solution no longer contain it is small Particle, the solution solubility are 4%；

2) dry-mixed: the ingredient that will have been prepared in container crosses 40 meshes, then stirs several minutes, is uniformly mixed each pulvis；

3) wet mixing: being added suitable PVA bonding agent during stirring sintered flux powder, and carry out uniformity stirring, control The size for making the speed and additional amount that are added, prevents agglomeration or cementability inadequate, is granulated with facilitating；

4) be granulated: being granulated by the hand rubbing comminution granulation that is sieved, by the wet feed stirred evenly in 12 mesh sieve rubbing granulating back and forth；So It is dried afterwards in ventilation, removes moisture extra in wet feed；

5) low temperature drying: the main purpose of drying is the attached water for evaporating wet feed particle surface, removes in solder flux 99% moisture； Drying temperature is controlled at 180 DEG C ~ 200 DEG C, and the speed to heat up cannot be too fast, and control is advisable at 20 DEG C, and heating rate is excessively high can It can agglomeration；

6) it is sintered: the sintered flux particle after drying being placed on temperature and is set as being sintered 2 hours in 800 DEG C of furnace, in sintering process Temperature rise speed be 10 DEG C/min, the oxygenolysis of organic adhesive occurs during the sintering process for particle, and the crystal form of oxide turns Become, the exclusion of constitution water, the effect etc. between the decomposition and agglutinant and sinter of carbonate is reacted；

7) sieve: the solder flux sintered passes through the sieve of 12 ~ 60 mesh, and removal is excessive and crosses little particle；Flux particle greatly cannot very much Isolation air conservation weld seam very well, causes alloy transfer bad, and the too small then gas permeability of flux particle is bad, and dust is excessive, And cause weld seam slag inclusion；Test solder flux is then made according to above-mentioned steps.

Shown in welding process schematic diagram 1, welding condition are as follows: weldingvoltage 28-32V, welding current 420-500A, Speed of welding is 26-30m/h, dry extension of electrode 25-35mm.

It is tensile strength is 634Mpa, elongation percentage 27.4% by electronic universal tester measurement weld properties；Through Cross the 250 DEG C of * 2h drying of diffusible hydrogen test structure, diffusible hydrogen content 5.1ml/100g；- 20 DEG C of impact absorbing energy is 143J.

Example IV

The preparation method of low-hygroscopicity submerged arc sintered flux:

1) ingredient: ingredient weighs up required raw material by formula respectively on an electronic balance and is placed in same container, various mineral powders The sum of last mass fraction is 100%；Sintered flux component are as follows: fluorite 13-24%, bauxite 17-19%, magnesia 20-26%, Dali Stone 28-35%, wollastonite 17-19%, rutile 3-5%, zircon sand 0.1-1.2%, polyvinyl alcohol 3-6%, chrome green 1.2-3%, carbonic acid Sodium 3%, metallic nickel 3-4%, manganese metal 2-3%, rare earth oxide 1%；Configuration PVA bonding agent: the PVA powder of certain mass is accurately weighed End is slowly added into 20 DEG C of cold water and is dissolved, while being stirred continuously and so that it is sufficiently swollen, dispersed in cold water and wave The evolution of volatile material is then warming up to 95 DEG C of acceleration dissolutions, and keeps the temperature 2 ~ 2.5 hours, until solution no longer contains small Grain, the solution solubility are 4%；

2) dry-mixed: the ingredient that will have been prepared in container crosses 40 meshes, then stirs several minutes, is uniformly mixed each pulvis；

3) wet mixing: being added suitable PVA bonding agent during stirring sintered flux powder, and carry out uniformity stirring, control The size for making the speed and additional amount that are added, prevents agglomeration or cementability inadequate, is granulated with facilitating；

4) be granulated: being granulated by the hand rubbing comminution granulation that is sieved, by the wet feed stirred evenly in 12 mesh sieve rubbing granulating back and forth；So It is dried afterwards in ventilation, removes moisture extra in wet feed；

5) low temperature drying: the main purpose of drying is the attached water for evaporating wet feed particle surface, removes in solder flux 99% moisture； Drying temperature is controlled at 180 DEG C ~ 200 DEG C, and the speed to heat up cannot be too fast, and control is advisable at 20 DEG C, and heating rate is excessively high can It can agglomeration；

6) it is sintered: the sintered flux particle after drying being placed on temperature and is set as being sintered 2 hours in 800 DEG C of furnace, in sintering process Temperature rise speed be 10 DEG C/min, the oxygenolysis of organic adhesive occurs during the sintering process for particle, and the crystal form of oxide turns Become, the exclusion of constitution water, the effect etc. between the decomposition and agglutinant and sinter of carbonate is reacted；

7) sieve: the solder flux sintered passes through the sieve of 12 ~ 60 mesh, and removal is excessive and crosses little particle；Flux particle greatly cannot very much Isolation air conservation weld seam very well, causes alloy transfer bad, and the too small then gas permeability of flux particle is bad, and dust is excessive, And cause weld seam slag inclusion；Test solder flux is then made according to above-mentioned steps.

Shown in welding process schematic diagram 1, welding condition are as follows: weldingvoltage 28-32V, welding current 420-500A, Speed of welding is 26-30m/h, dry extension of electrode 25-35mm.

It is tensile strength is 627Mpa, elongation percentage 25.4% by electronic universal tester measurement weld properties；Through Cross the 250 DEG C of * 2h drying of diffusible hydrogen test structure, diffusible hydrogen content 4.7ml/100g；- 20 DEG C of impact absorbing energy is 147J.

Embodiment five

The preparation method of low-hygroscopicity submerged arc sintered flux:

1) ingredient: ingredient weighs up required raw material by formula respectively on an electronic balance and is placed in same container, various mineral powders The sum of last mass fraction is 100%；Sintered flux component are as follows: fluorite 13-22%, bauxite 17-19%, magnesia 20-24%, Dali Stone 28-40%, wollastonite 17-20%, rutile 3-5%, zircon sand 0.1-1.2%, polyvinyl alcohol 3-5%, chrome green 1.2-3%, carbonic acid Sodium 3%, metallic nickel 3-4%, manganese metal 2-3%, rare earth oxide 1%；Configuration PVA bonding agent: the PVA powder of certain mass is accurately weighed End is slowly added into 20 DEG C of cold water and is dissolved, while being stirred continuously and so that it is sufficiently swollen, dispersed in cold water and wave The evolution of volatile material is then warming up to 95 DEG C of acceleration dissolutions, and keeps the temperature 2 ~ 2.5 hours, until solution no longer contains small Grain, the solution solubility are 4%；

2) dry-mixed: the ingredient that will have been prepared in container crosses 40 meshes, then stirs several minutes, is uniformly mixed each pulvis；

3) wet mixing: being added suitable PVA bonding agent during stirring sintered flux powder, and carry out uniformity stirring, control The size for making the speed and additional amount that are added, prevents agglomeration or cementability inadequate, is granulated with facilitating；

4) be granulated: being granulated by the hand rubbing comminution granulation that is sieved, by the wet feed stirred evenly in 12 mesh sieve rubbing granulating back and forth；So It is dried afterwards in ventilation, removes moisture extra in wet feed；

5) low temperature drying: the main purpose of drying is the attached water for evaporating wet feed particle surface, removes in solder flux 99% moisture； Drying temperature is controlled at 180 DEG C ~ 200 DEG C, and the speed to heat up cannot be too fast, and control is advisable at 20 DEG C, and heating rate is excessively high can It can agglomeration；

6) it is sintered: the sintered flux particle after drying being placed on temperature and is set as being sintered 2 hours in 800 DEG C of furnace, in sintering process Temperature rise speed be 10 DEG C/min, the oxygenolysis of organic adhesive occurs during the sintering process for particle, and the crystal form of oxide turns Become, the exclusion of constitution water, the effect etc. between the decomposition and agglutinant and sinter of carbonate is reacted；

7) sieve: the solder flux sintered passes through the sieve of 12 ~ 60 mesh, and removal is excessive and crosses little particle；Flux particle greatly cannot very much Isolation air conservation weld seam very well, causes alloy transfer bad, and the too small then gas permeability of flux particle is bad, and dust is excessive, And cause weld seam slag inclusion；Test solder flux is then made according to above-mentioned steps.

Shown in welding process schematic diagram 1, welding condition are as follows: weldingvoltage 28-32V, welding current 420-500A, Speed of welding is 26-30m/h, dry extension of electrode 25-35mm.

It is tensile strength is 625Mpa, elongation percentage 26.4% by electronic universal tester measurement weld properties；Through Cross the 250 DEG C of * 2h drying of diffusible hydrogen test structure, diffusible hydrogen content 4.9ml/100g；- 20 DEG C of impact absorbing energy is 143J.

Embodiment six

The preparation method of low-hygroscopicity submerged arc sintered flux:

1) ingredient: ingredient weighs up required raw material by formula respectively on an electronic balance and is placed in same container, various mineral powders The sum of last mass fraction is 100%；Sintered flux component are as follows: fluorite 13-26%, bauxite 17-19%, magnesia 23-24%, Dali Stone 29-40%, wollastonite 17-20%, rutile 3-5%, zircon sand 0.1-1.2%, polyvinyl alcohol 3-5%, chrome green 1.2-3%, carbonic acid Sodium 3%, metallic nickel 3%, manganese metal 2-3%, rare earth oxide 1%；Configuration PVA bonding agent: the PVA powder of certain mass is accurately weighed End is slowly added into 20 DEG C of cold water and is dissolved, while being stirred continuously and so that it is sufficiently swollen, dispersed in cold water and wave The evolution of volatile material is then warming up to 95 DEG C of acceleration dissolutions, and keeps the temperature 2 ~ 2.5 hours, until solution no longer contains small Grain, the solution solubility are 4%；

2) dry-mixed: the ingredient that will have been prepared in container crosses 40 meshes, then stirs several minutes, is uniformly mixed each pulvis；

3) wet mixing: being added suitable PVA bonding agent during stirring sintered flux powder, and carry out uniformity stirring, control The size for making the speed and additional amount that are added, prevents agglomeration or cementability inadequate, is granulated with facilitating；

4) be granulated: being granulated by the hand rubbing comminution granulation that is sieved, by the wet feed stirred evenly in 12 mesh sieve rubbing granulating back and forth；So It is dried afterwards in ventilation, removes moisture extra in wet feed；

5) low temperature drying: the main purpose of drying is the attached water for evaporating wet feed particle surface, removes in solder flux 99% moisture； Drying temperature is controlled at 180 DEG C ~ 200 DEG C, and the speed to heat up cannot be too fast, and control is advisable at 20 DEG C, and heating rate is excessively high can It can agglomeration；

6) it is sintered: the sintered flux particle after drying being placed on temperature and is set as being sintered 2 hours in 800 DEG C of furnace, in sintering process Temperature rise speed be 10 DEG C/min, the oxygenolysis of organic adhesive occurs during the sintering process for particle, and the crystal form of oxide turns Become, the exclusion of constitution water, the effect etc. between the decomposition and agglutinant and sinter of carbonate is reacted；

7) sieve: the solder flux sintered passes through the sieve of 12 ~ 60 mesh, and removal is excessive and crosses little particle；Flux particle greatly cannot very much Isolation air conservation weld seam very well, causes alloy transfer bad, and the too small then gas permeability of flux particle is bad, and dust is excessive, And cause weld seam slag inclusion；Test solder flux is then made according to above-mentioned steps.

Shown in welding process schematic diagram 1, welding condition are as follows: weldingvoltage 28-32V, welding current 420-500A, Speed of welding is 26-30m/h, dry extension of electrode 25-35mm.

It is tensile strength is 630Mpa, elongation percentage 24.4% by electronic universal tester measurement weld properties；Through Cross the 250 DEG C of * 2h drying of diffusible hydrogen test structure, diffusible hydrogen content 4.7ml/100g；- 20 DEG C of impact absorbing energy is 137J.

By the effect of above embodiments it can be found that the present invention is used to be sintered by choosing organic adhesive polyvinyl alcohol The bonding of solder powder is granulated, and suitable chrome green and Na2CO3 is added as Composite sintering agent, in high temperature sintering into formula During, organic adhesive starts slowly to decompose at 200 DEG C or more, and with the rising of temperature, chromium and titanium ion will be with sintering Solid solution reaction occurs for object, and point defect solubility will significantly increase, and crystal is distorted the mass transfer activated make in sintering process more rapidly It carries out, at 600 DEG C, Na2CO3 is melted and liquid phase occurred, and the rearrangement of particle and densification process will be easier to carry out, and finally be made The consistency and intensity of sintered flux particle are able to satisfy requirement, while having lower hygroscopicity；Alloying component is as de- Sulphur agent reduces the S content of weld metal, improves the ability of the anti-H2S corrosion of welding point；Facilitate to improve field trash containing S simultaneously The distributional pattern of (mainly MnS and FeS) is allowed to nodularization to improve the low-temperature impact toughness of connector.

The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto, Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.

Claims (4)

1. a kind of low-hygroscopicity submerged-arc welding sintered flux, which is characterized in that the submerged-arc welding sintered flux by weight percentage: Fluorite 13-28%, bauxite 16-20%, magnesia 20-28%, marble 28-45%, wollastonite 17-20%, rutile 3-6%, zirconium English Sand 0.1-1.2%, polyvinyl alcohol 3-6%, chrome green 1.2-3.6%, sodium carbonate 2-8%, metallic nickel 3-6%, manganese metal 2-5%, rare earth oxygen Compound 1-3%.

2. solder flux according to claim 1, it is characterised in that: flux component are as follows: fluorite 18-28%, bauxite 17-20%, Magnesia 20-28%, marble 28-30%, wollastonite 17-20%, rutile 3-6%, zircon sand 0.1-1.2%, polyvinyl alcohol 3-6%, Chrome green 1.2-3.6%, sodium carbonate 2-8%, metallic nickel 3-6%, manganese metal 2-3%, rare earth oxide 1-2%.

3. solder flux according to claim 1, it is characterised in that: fluorite: CaF₂>=94%, SiO₂≤ 4.0%, S≤0.04%, P ≤0.04%；Magnesia: MgO >=96%, SiO₂≤ 1.5%, S≤0.04%, P≤0.04%；Aluminium vanadine: Al₂O₃>=85%, CaO≤ 0.6%, SiO₂≤ 10%, TiO₂≤ 4.5%, S≤0.06%, P≤0.06%；Wollastonite: CaO:40%-50%, SiO₂: 48%-52%；Gold Red stone: TiO₂>=87.0%, S≤0.04%, P≤0.04%；Zircon sand: ZrO₂>=60%, SiO₂>=25%, C≤0.1%, S≤ 0.05%, P≤0.05%；Metallic nickel: Ni >=99.9%, C≤0.02%, S≤0.005%, P≤0.01%, granularity: 200 mesh；Metal Manganese: Mn >=99.9%, C≤0.02%, S≤0.005%, P≤0.01%, granularity: 200 mesh.

4. a kind of preparation method of the low tide submerged-arc welding sintered flux as described in claims 1 to 3 any one, feature exist In, comprising the following steps:

1) ingredient: ingredient weighs up required raw material by formula respectively on an electronic balance and is placed in same container, various mineral powders The sum of last mass fraction is 100%；Configuration PVA bonding agent: accurately weigh PVA powder, be slowly added into 20 DEG C of cold water into Row dissolution, while being stirred continuously makes it sufficiently be swollen, disperse in cold water and the evolution of volatile materials, is then warming up to 95 DEG C Accelerate dissolution, and keep the temperature 2 ~ 2.5 hours, until solution no longer contains molecule, which is 4%；

2) dry-mixed: the ingredient that will have been prepared in container crosses 40 meshes, then stirs several minutes, is uniformly mixed each pulvis；

3) wet mixing: suitable PVA bonding agent is added during stirring sintered flux powder, and carries out uniformity stirring；

4) be granulated: being granulated by the hand rubbing comminution granulation that is sieved, by the wet feed stirred evenly in 12 mesh sieve rubbing granulating back and forth；So It is dried afterwards in ventilation, removes moisture extra in wet feed；

5) low temperature drying: the main purpose of drying is the attached water for evaporating wet feed particle surface, removes in solder flux 99% moisture； Drying temperature is controlled at 180 DEG C ~ 200 DEG C, controls the speed of heating in 20 DEG C/h；

6) it is sintered: the sintered flux particle after drying being placed on temperature and is set as being sintered 2 hours in 800 DEG C of furnace, in sintering process Temperature rise speed be 10 DEG C/min, the oxygenolysis of organic adhesive occurs during the sintering process for particle, and the crystal form of oxide turns Become；

7) sieve: the solder flux sintered passes through the sieve of 12 ~ 60 mesh, removes excessive and crosses little particle, that is, can be made into low tide and bury Arc-welding sintered flux.