CN106425171B - Low hydrogen type iron powder electrode and preparation method thereof - Google Patents
Low hydrogen type iron powder electrode and preparation method thereof Download PDFInfo
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- CN106425171B CN106425171B CN201611108744.0A CN201611108744A CN106425171B CN 106425171 B CN106425171 B CN 106425171B CN 201611108744 A CN201611108744 A CN 201611108744A CN 106425171 B CN106425171 B CN 106425171B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/365—Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/404—Coated rods; Coated electrodes
Abstract
The invention belongs to technical field of welding materials, and in particular to a kind of low hydrogen type iron powder electrode and preparation method thereof.The coating of low hydrogen type iron powder electrode of the present invention is made of following parts by weight ingredient: 47~49 parts of marble；13~15 parts of fluorite；2~4 parts of ferrosilicon；1.5~2.5 parts of titanium dioxide；1.5~2.5 parts of wood powder；14~16 parts of rutile；4~6 parts of feldspar powder；6~8 parts of silica flour；4~6 parts of mica powder；12~14 parts of titanium valve；19~21 parts of iron powder.Low hydrogen type iron powder electrode weld seam overall appearance of the present invention is preferable, and sideline is parallel, with base material good knitting.Ripple is preferable, and weld seam is neat, and weld seam height is close.The defects of face of weld pore-free, crackle, slag inclusion, undercut, overlap, the welding slag after welding rod welding are most easy to fall off.
Description
Technical field
The invention belongs to technical field of welding materials, and in particular to a kind of low hydrogen type iron powder electrode and preparation method thereof.
Background technique
It is to measure as the steel that needs of social development and economic construction is still the irreplaceable important raw material of the mankind
The important indicator of one national overall national strength and industrial level.Welding is the main connection type of steel material, iron powder electrode benefit
With there are also the trade waste iron powders generated in many steel plant's production processes to be added in electrode coating now, the molten of welding rod is improved
The rate of applying.
Good appearance of weld requires surface smooth, the fine and closely woven beauty of ripple, and the geometry and size of weld seam are correct.Weld seam
Should be sleekly to base material transition, the defects of reinforcement complies with standard, no undercut.The quality of appearance of weld not only influences beauty, heavier
What is wanted is the mechanical property for influencing welding point.The factor for influencing appearance of weld mainly has slag setting temperature, high-temperature slag
Viscosity, surface tension and density etc..
The welding rod of removability of slag difference not only causes the difficulty of scarfing cinder, reduces welding productivity, and in multilayer welding construction, also
Often generate the defect of slag inclusion.The factor for influencing the removability of slag mainly has the linear expansion coefficient of slag, the oxidisability of slag, slag
Crispness.
Domestic production low-hydrogen electrode at present, while guaranteeing strong mechanical performance, process operability is bad, appearance of weld
Ripple it is not fine and smooth beautiful enough, meanwhile, the welding slag after welding rod welding is not easily to fall off, causes face of weld defect larger.
Summary of the invention
Against the above deficiency, technical problem to be solved by the invention is to provide weld seam beauty zero defect after a kind of welding,
The caducous low hydrogen type iron powder electrode of welding slag.
Low hydrogen type iron powder electrode of the present invention is made of core wire and the coating two parts being attached on core wire, wherein the medicine
Skin is made of following parts by weight ingredient:
Further, above-mentioned low hydrogen type iron powder electrode, wherein the coating is made of following parts by weight ingredient:
Above-mentioned low hydrogen type iron powder electrode, wherein the coating composition in marble in CaCO3>=97wt%；
CaF in fluorite2>=96wt%；
Siliceous 75wt% in ferrosilicon powder；
Titanium dioxide is anatase thpe white powder, wherein TiO2>=91.0wt%；
The partial size of wood powder is 80 mesh；
Rutile is synthetic rutile, 120 mesh of granularity；
Feldspar powder is fine albite in powder, and partial size is 800 mesh；
Silica flour partial size is 200 mesh, wherein silicon content >=99.7wt%, and iron-content is 80~100ppm, moisture≤
0.05wt%；
Mica powder is high temperature resistant mica powder, wherein SiO2Content is 44~50wt%, Al2O3Content is 20~33wt%,
K2O content is 9~11wt%；
Fe >=98wt% in iron powder, P < 0.03wt%, S < 0.03wt%, hydrogen loss are 0.1~0.2wt%, partial size 120
Mesh.
The present invention also provides a kind of preparation methods of low hydrogen type iron powder electrode.
The preparation method of above-mentioned low hydrogen type iron powder electrode, comprising the following steps:
A, core wire is handled: cleaning core wire surface rusty stain, greasy dirt, impurity make the clean finishing in core wire surface；
B, the modulation of waterglass: the stirring of 5wt% methyl acrylate is added in waterglass, for use；
C, it ingredient: is weighed according to the ingredient of above-mentioned coating, for use；
D, dry-mixed, wet mixing: the waterglass that b step modulates is added in the compositions of surfacing metal that step c obtains after mixing, is stirred
It mixes, mixes, obtain wet mass medicinal powder；
E, welding rod suppress: by hydraulic press by wet mass medicinal powder along core wire length direction be coated in a step process after core wire
On, make coating smooth surface, coating thickness is uniform, avoids core wire packet header；
F, it dries: the welding rod that step e makes being hung 24 hours in air, again 300~400 after its dry tack free
DEG C drying 1~2h to get.
The preparation method of above-mentioned low hydrogen type iron powder electrode, the concentration of the liquid soluble glass are 45 Baume degrees, modulus M=
2.9,5% methyl acrylate, which is added, can make electrode coating have certain moisture resistance.
The preparation method of above-mentioned low hydrogen type iron powder electrode, the temperature that wherein welding rod described in f step is hung in air are
15~25 DEG C, the relative humidity of air is 50%~55%.
Low hydrogen type iron powder electrode of the present invention, by reasonable disposition raw material and coating constituent, in addition special technique
And the method for inspection, so that low hydrogen type iron powder electrode weld seam overall appearance of the present invention is preferable, sideline is parallel, with base material good knitting.
Ripple is preferable, and weld seam is neat, and weld seam height is close.Weld seam is through examining pore-free, crackle, slag inclusion, undercut, overlap etc. to lack
It falls into, the welding slag after welding rod welding is easy to fall off.
Detailed description of the invention
Fig. 1 is macroscopical appearing diagram of weld seam after ZP1 group welding in embodiment；
Fig. 2 is macroscopical appearing diagram of weld seam after ZP2 group welding in embodiment；
Fig. 3 is macroscopical appearing diagram of weld seam after ZP3 group welding in embodiment；
Fig. 4 is macroscopical appearing diagram of weld seam after ZP4 group welding in embodiment.
Specific embodiment
Low hydrogen type iron powder electrode of the present invention is made of core wire and the coating two parts being attached on core wire, wherein the medicine
Skin is made of following parts by weight ingredient:
Further, above-mentioned low hydrogen type iron powder electrode, wherein the coating is made of following parts by weight ingredient:
Above-mentioned low hydrogen type iron powder electrode, wherein the coating composition in marble in CaCO3>=97wt%；
CaF in fluorite2>=96wt%；
Siliceous 75wt% in ferrosilicon powder；
Titanium dioxide is anatase thpe white powder, wherein TiO2>=91.0wt%；
The partial size of wood powder is 80 mesh；
Rutile is synthetic rutile, 120 mesh of granularity；
Feldspar powder is fine albite in powder, and partial size is 800 mesh；
Silica flour partial size is 200 mesh, wherein silicon content >=99.7wt%, and iron-content is 80~100ppm, moisture≤
0.05wt%；
Mica powder is high temperature resistant mica powder, wherein SiO2Content is 44~50wt%, Al2O3Content is 20~33wt%,
K2O content is 9~11wt%；
Fe >=98wt% in iron powder, P < 0.03wt%, S < 0.03wt%, hydrogen loss are 0.1~0.2wt%, partial size 120
Mesh.
Influence of each element to welding performance in core wire are as follows:
(1) carbon is the main alloy element in steel, and when carbon content increases, intensity, the hardness of steel are significantly improved, and plasticity
It reduces.In the welding process, carbon plays the role of certain deoxidation, and chemical combination occurs with oxygen under high arc temperature, generates
Arc region and molten bath surrounding air are excluded, prevent oxygen, the nitrogen pernicious gas pair in air by carbon monoxide and carbon dioxide gas
The adverse effect that molten bath generates reduces the content of oxygen and nitrogen in weld metal.If phosphorus content is excessively high, reduction is violent, can draw
Play biggish splashing and stomata.In view of carbon is on the hardenability of steel and its on the increased influence of crack sensitivity, low carbon steel welding core
Phosphorus content be generally less than 0.1%；
(2) manganese is a kind of preferable alloying constituent in steel, and with the increase of manganese content, intensity and toughness can be mentioned
It is high.In the welding process, manganese is also a kind of preferable deoxidier, can be reduced the content of oxygen in weld seam.Manganese and vulcanization, which are closed, forms sulphur
Change manganese to float in slag, to reduce weld seam hot cracking tendency.Therefore the manganese content of general structural carbon steel core wire is 0.30%
~0.55%；
(3) silicon is a kind of preferable alloying constituent, and suitable silicon is added in steel can improve the yield strength of steel, elasticity and anti-
Acid energy；If too high levels reduce plasticity and toughness.In the welding process, silicon also has preferable deoxidizing capacity, with oxygen shape
At silica, but it can improve the viscosity of slag, easily non-metallic inclusion be promoted to generate；
(4) chromium can be improved the hardness, wearability and corrosion resistance of steel.For mild steel, chromium is a kind of accidental
Impurity.The main metallurgical of chromium is characterized in being easy to abrupt oxidization, the oxide chrome green of infusibility is formed, to increase weldering
A possibility that stitching metallic inclusion.After chrome green is transitioned into slag, viscosity coefficient of dross can be made to improve, mobility reduces；
(5) nickel has a significant effect of comparison to the toughness of steel, when general cold impact value is more demanding, is suitably incorporated
Nickel；
(6) sulphur is a kind of objectionable impurities, with the increase of sulfur content, will increase the hot cracking tendency of weld seam, therefore core wire
The content of middle sulphur is not greater than 0.04%.When welding important feature, sulfur content is not greater than 0.03%；
(7) phosphorus is a kind of objectionable impurities, and the main harm of sulphur is that weld seam is made to generate cold short phenomenon, with the increasing of phosphorus content
Add, the toughness for causing weld metal, particularly low-temperature impact toughness is declined, therefore phosphorus content is not greater than in core wire
0.04%.When welding important feature, phosphorus content is not greater than 0.03%.
The effect and influence of each ingredient in coating specifically:
1, the effects of marble plays desulfurization, stabilising arc in the welding process, protects weld seam not by oxygen, nitridation.In desulfurization
It can occur to react as follows:
CaCO3→CaO+CO2
FeS+CaO→CaS+FeO
FeO+Mn→MnO+Fe
2, fluorite is strong diluent, and gas in weld metal is made to be easy to escape, can desulfurization.
3, ferrosilicon plays deoxidation, exothermic in the welding process, and its chemical lively type is high, can make weld metal stone
Mo Hua.Ferrosilicon can occur to react as follows when carrying out deoxidation:
2FeO+Si→SiO2+2Fe
4, titanium dioxide can play the role of multinomial in the welding process, and such as stabilising arc keeps spatter few；Form short slag；Energy
Active slag is generated, uniform fold protects weld seam in welded joints；Because TiO2 crystallization rate is fast, keep de- slag convenient；Weld ripples is careful；
Titanate is combined into iron oxide and enters slag, plays deoxidation, and reaction equation is as follows:
FeO+TiO2→FeTiO3
5, organic matter (wood powder, starch, resin) generates gas in combustion, make weld seam not with air oxidation, nitridation；
The general high resilience of organism, thus it is advantageous to suppressing.
6, rutile oxidisability is weak, welding arc stablility, good directionality, and appearance of weld is beautiful, and slag covers.
7, feldspar powder plays stabilising arc, slag making, is conducive to de- slag in right amount, will excessively slow down weldering speed, increases the viscous of slag
Degree.
8, silica flour plays slag making, and the gas sloughed in weld seam can be also reacted with iron oxide, accelerates weldering speed；In right amount may be used
The activity for increasing slag can excessively make slag glutinous, splash big.
9, mica powder plays stabilising arc, slag making, and springiness can increase coating gas permeability.Excessive excessively thick mica meeting
Keep coating loose, electrode surface is of poor quality.
10, titanium-iron powder or titanium valve have bigger deoxidizing capacity than ferrosilicon, and unsuitable dosage is excessive, because it is expensive.
For with low hydrogen type iron powder electrode of the present invention, with the increase of iron powder amount, coating burn-off rate is accelerated, and covers tube length
Degree becomes smaller, and will cause blow force of arc reduction.Therefore suitable iron powder should be added, to obtain suitable length sleeve.Suitable iron powder
Amount can judge by means of welding slag weight with fusing welding rod weight ratio, i.e., as the welding slag weight S and ratio S/ for melting welding rod weight E
When E=18~24%, welding rod length sleeve is suitable, and welding technological properties is good；As S/E < 18%, welding rod sleeve is short, electric arc
Blowing force is small, while welding that the quantity of slag is few, and skull is too thin, and the removability of slag is deteriorated；However as S/E > 24%, welding rod sleeve is too long, electric arc
Blowing force is excessive, and the welding quantity of slag is more, and the effective rate of utilization of arc heat is low.When coating thickness difference, the suitable additional amount of iron powder is not yet
Together, when coating outer diameter is 6.8mm, the amount of iron powder is preferably controlled below 45%；When coating outer diameter be 8mm when, iron powder it is suitable
Adding people's amount is 45~63%.But iron powder plus people's amount and coating thickness increase is all limited, the most greatly people of iron powder
Amount typically not greater than 70%；Coating thickness, if indicated with D/d, maximum value is up to 2.5.In addition, the additional amount of iron powder is not
Meanwhile required iron powder physical property is also different, and when additional amount is few, the iron powder of low loose ratio can be used.
Iron powder plays very big effect in the welding process, can accelerate the burn-off rate of coating, improves welding efficiency；Make
Weld metal increases, and improves deposition efficiency；Basic coating, which is added, can make arc stability.When iron powder is added excessive in coating,
It is just highly difficult in welding rod production, it is easy to keep coating blocked up and can not weld.
The present invention also provides a kind of preparation methods of low hydrogen type iron powder electrode.
The preparation method of above-mentioned low hydrogen type iron powder electrode, comprising the following steps:
A, core wire is handled: preprepared core wire being polished with sand paper, core wire surface is cleared up, keeps core wire surface clean
Finishing is straightened it, and weighs；
B, the modulation of waterglass: 45 Baume degrees, modulus M=2.9 common waterglass in be added 5wt% acrylic acid first
Ester, stirring, for use；When configuring waterglass, clean tap water is needed, and never grease, dirt etc. are mixed into, influence waterglass matter
Amount；
C, it ingredient: is weighed according to the ingredient of above-mentioned coating, for use；Make sure to keep in mind because weighed weight value itself is smaller,
There may be experimental errors, therefore have to weigh accurately, in order to avoid influence the quality of welding rod；
D, dry-mixed, wet mixing: uniform color is presented in medicinal powder to the compositions of surfacing metal that step c is obtained after mixing, and cannot have
It is blocky, granular, dry powder cannot be spread out；It is gradually added into the waterglass that b step modulates again, is gently mixed, mixes, until can be with
Until forming dough, coating is made to have good plasticity and suitable stickiness, guarantee is easy to mould, and has preferable flowing
Property, and be attached on around core wire securely, make coating that there is certain intensity；Waterglass will gradually drip when close to dough
Enter, prevent mixed medicinal powder excessively dilute, finally obtains wet mass medicinal powder；
E, welding rod is suppressed: wet mass medicinal powder group is poured into press, is attached on it securely around core wire by press,
Along the core wire length direction core wire that is coated uniformly on that treated, one section of the welding rod clamping end there are 20mm without coating, the other end
Core wire exposes, and avoids core wire packet header；
F, it dries: the welding rod that step e makes being hung for 24 hours in air, again at 300~400 DEG C after its dry tack free
Baking oven in drying 1~2h to get.
The preparation method of above-mentioned low hydrogen type iron powder electrode, the concentration of the liquid soluble glass are 45 Baume degrees, modulus M=
2.9,5wt% methyl acrylate, which is added, can make electrode coating have certain moisture resistance.
The preparation method of above-mentioned low hydrogen type iron powder electrode, the temperature that wherein welding rod described in f step is hung in air are
15~25 DEG C, the relative humidity of air is 50%~55%.
The removability of slag is to evaluate one of the main technological properties of welding rod quality, it directly affects welding quality and welding production effect
Rate.The removability of slag depends primarily on the thermal expansion coefficient of slag, microstructure.The welding rod of removability of slag difference, be easy to cause weld seam slag inclusion,
The defects of bad is shaped, composite technology level is reduced.By experimental observation, whether welding slag voluntarily takes off in postwelding cooling procedure
It falls；Commissure is tapped with hand hammer, whether welding slag is easy to fall off.Experiments have shown that the easily de- slag of the low hydrogen type iron powder electrode of development, it is dry to take off slag
Only not the defects of not will cause field trash.
Due to hydrogen controlled electrode mechanical property preferably and processing performance is poor, while usability of electrode can be determined mainly
In the composition of electrode coating, therefore, in order to preferably study each ingredient in coating and its match to a certain or certain of welding rod
The influence of performance, inventor have carried out compositions of surfacing metal by many experiments the study found that working as the composition of electrode coating
In following range, welding rod appearance and the removability of slag can be better than other proportions: 47~49 parts of marble；13~15 parts of fluorite；Ferrosilicon 2
~4 parts；1.5~2.5 parts of titanium dioxide；1.5~2.5 parts of wood powder；14~16 parts of rutile；4~6 parts of feldspar powder；Silica flour 6~8
Part；4~6 parts of mica powder；12~14 parts of titanium valve；19~21 parts of iron powder；Especially select 48 parts of marble；14 parts of fluorite；Ferrosilicon 3
Part；2 parts of titanium dioxide；2 parts of wood powder；15 parts of rutile；5 parts of feldspar powder；7 parts of silica flour；5 parts of mica powder；13 parts of titanium valve；Iron powder 20
When part, the appearance of obtained welding rod is best, and it is most fast to take off slag.
A specific embodiment of the invention is further described below with reference to embodiment, is not therefore limited the present invention
System is among the embodiment described range.
Embodiment 1
1, most representational several groups of experiments in many experiments are had chosen, only below to prove the welding rod of the invention selected
Coating recipe has more preferable removability of slag energy and exterior appearance, and steps are as follows for specific experiment:
(1) core wire is handled: preprepared H08A core wire (its chemical component is shown in Table 1) is surface-treated,
Its surface and oil contaminant, dust, rusty stain etc. are removed, it is straightened, and is weighed；
Table 1H08A core wire chemical component (/wt%)
| Chemical component | C | Si | Mn | P | S | Ni | Cr |
| Core wire H08A | ≤0.10 | ≤0.03 | 0.30~0.55 | ≤0.03 | ≤0.03 | ≤0.30 | ≤0.20 |
(2) modulation of waterglass: in waterglass preparing pool, it is deployed into required concentration, and press liquid soluble glass weight
0.25%~0.5% potassium permanganate is added in amount, and stirring evenly can be used；
(3) ingredient: the coating recipe developed according to table 2 weighs each ingredient in formula.Make sure to keep in mind because of itself
Weighed weight value is smaller, it is understood that there may be experimental error, therefore have to weigh accurately, in order to avoid influence the quality of welding rod；
(3) dry-mixed: load weighted coating recipe being put into small basin, it is stirred with the core wire handled well until inciting somebody to action
It is uniformly mixed, and a kind of color is presented in medicinal powder, and cannot have blocky, granular, and when stirring cannot spread out dry powder；
(4) wet mixing: being gradually added into waterglass in the medicinal powder mixed, be gently mixed, and is uniformly mixed, until that can be formed
Until dough；
(5) welding rod is suppressed: the good medicinal powder of wet mixing being uniformly coated in by press along core wire length direction and is handled well
Core wire on, one section of the welding rod clamping end there are 20mm without coating, other end core wire expose, not form packet header；
(6) it dries: the welding rod made being placed for 24 hours, is allowed to dry, it is desirable that temperature is controlled at 15~25 DEG C, air
Relative humidity is 50%~55%, and the welding rod dried is placed in drying box, and 1~2 hour is dried at 350~400 DEG C.
The coating recipe made is made into welding rod, according to experiment demand, every group of formula makes two respectively, and by each weldering
Item is numbered, and number is successively are as follows: ZP1, ZP2, ZP3, ZP4.
Coating component prescription in 2 welding rod of table
2, in order to guarantee the accuracy of microscopic structure inspection result, it is necessary to prepare the metallographic specimen of a high quality, specifically
Preparation method and appearance detection are as follows:
1. sample intercepts: with Metallographic Specimen Cutting Machine intercepting sample away from striking area and blow-out area at a certain distance from, guaranteeing
There cannot be any deformation in sampling process, be heated, prevent sample tissue from changing, internal flaw extension and distortion.
2. the polishing of sample: polishing is a smooth flour milling in order to obtain, generally will be by corase grinding and fine grinding.Corase grinding exists
It is carried out on grinding wheel；Fine grinding is carried out with sand paper, and sand paper model from thick to thin, gradually mitigates Wear track depth, is beaten changing a sand paper
It is rinsed before mill with clear water, and polished after sample is rotated by 90 °.
3. sample polishes: sample being polished on the polishing machine for be placed with antiscuffing paste, first rough polishing, then fine polishing.Polishing is
In order to stay in the subtle trace on metallographic specimen surface after removing fine grinding, keep flour milling smooth bright and clean.
4. sample corrodes: polished sample being corroded with aggressive agent, the nitric acid alcohol that aggressive agent is 4% applies after washing
Dehydrated alcohol is adornd, is dried up with hair dryer.
5. sample tissue observe: sample is placed on glass slide and with plasticine by it by flattening, in optical microscopy
Upper observation sample tissue, and take pictures.
After welding rod completes, welding rod appearance should be checked, comprising: core diameter, welding rod length, clamping end are long
Degree, packet header, chamfering, tail is not clean for mill, coating damage, foaming, elephant skin etc..By not examined as requested with welding rod for production
It tests, observes whether it is defective, and defective welding rod cannot use, take from the mode of new production and handle.
Welding rod appearance is checked, is found from Fig. 1~4, under above-mentioned identical preparation condition, ZP1 group welding rod coating recipe
Under welding rod weld seam overall appearance it is preferable, sideline is parallel, with base material good knitting.Ripple is preferable, and weld seam is neat, and weld seam is high
It is low close, the defects of face of weld pore-free, crackle, slag inclusion, undercut, overlap.
ZP2 weld seam overall appearance is preferable, and sideline is bordering in parallel, and with base material good knitting, ripple is of poor quality, is not very whole
Together, weld seam height slightly has the defects of injustice, face of weld flawless, slag inclusion, undercut, overlap, there is a gas hole defect.
ZP3 weld seam overall appearance is preferable, and sideline is bordering in parallel, with base material good knitting.Ripple is preferable, but is not very
Neatly, weld seam height slightly has the defects of injustice, face of weld pore-free, crackle, slag inclusion, undercut, overlap.
ZP4 weld appearance is overall beautiful, is parallel to each other between sideline, merges with base material very well, and ripple is smooth, neatly,
The defects of face of weld pore-free, slag inclusion, crackle, undercut, overlap, but weld seam both sides lines are not straight.
3, removability of slag check analysis
Whether the slag of face of weld is easy to remove in postwelding, is one of the main indicator for evaluating welding rod quality, mainly
Commissure is tapped with hand hammer, welding slag is easy to fall off, illustrates that welding quality is good, and welding productivity is high, and welding rod meets practical application level；
Above-mentioned four groups of samples are after welding in cooling procedure, and with the reduction of temperature, slag largely voluntarily falls off, wherein
Welding slag after the welding of ZP1 welding rod is most easy to fall off.
Claims (5)
1. low hydrogen type iron powder electrode is made of, which is characterized in that the core wire core wire and the coating two parts being attached on core wire
For H08A；The coating is made of following parts by weight ingredient:
The preparation method of the low hydrogen type iron powder electrode the following steps are included:
A, core wire is handled: cleaning core wire surface rusty stain, greasy dirt, impurity make the clean finishing in core wire surface；
B, the modulation of waterglass: the stirring of 5wt% methyl acrylate is added in waterglass, for use；The concentration of the waterglass is
45 Baume degrees, modulus M=2.9；
C, it ingredient: is weighed according to the ingredient of above-mentioned coating, for use；
D, dry-mixed, wet mixing: being added the waterglass that b step modulates for the compositions of surfacing metal that step c obtains after mixing, stirring,
It mixes, obtains wet mass medicinal powder；
E, welding rod suppress: by hydraulic press by wet mass medicinal powder along core wire length direction be coated in a step process after core wire on, make
Coating smooth surface, coating thickness is uniform, avoids core wire packet header；
F, it dries: the welding rod that step e makes is hung 24 hours in air, dried again at 300~400 DEG C after its dry tack free
Dry 1~2h to get.
2. low hydrogen type iron powder electrode according to claim 1, it is characterised in that: the coating is by following parts by weight ingredient group
At:
3. low hydrogen type iron powder electrode according to claim 1 or claim 2, it is characterised in that: CaCO in the marble3>=97wt%；
CaF in fluorite2>=96wt%；
Siliceous 75wt% in ferrosilicon powder；
The titanium dioxide is anatase thpe white powder, wherein TiO2>=91.0wt%；
The partial size of the wood powder is 80 mesh；The rutile is synthetic rutile, 120 mesh of granularity；
The feldspar powder is fine albite in powder, and partial size is 800 mesh；
The silica flour partial size is 200 mesh, wherein silicon content >=99.7wt%, and iron-content is 80~100ppm, moisture≤
0.05wt%；
The mica powder is high temperature resistant mica powder, wherein SiO2Content is 44~50wt%, Al2O3Content is 20~33wt%, K2O
Content is 9~11wt%；
Fe >=98wt% in the iron powder, P < 0.03wt%, S < 0.03wt%, hydrogen loss are 0.1~0.2wt%, partial size 120
Mesh.
4. the preparation method of any one of claims 1 to 3 low hydrogen type iron powder electrode, which comprises the following steps:
A, core wire is handled: cleaning core wire surface rusty stain, greasy dirt, impurity make the clean finishing in core wire surface；
B, the modulation of waterglass: the stirring of 5wt% methyl acrylate is added in waterglass, for use；The concentration of the waterglass is
45 Baume degrees, modulus M=2.9；
C, it ingredient: is weighed according to the ingredient of coating as claimed in claim 1 or 2, for use；
D, dry-mixed, wet mixing: being added the waterglass that b step modulates for the compositions of surfacing metal that step c obtains after mixing, stirring,
It mixes, obtains wet mass medicinal powder；
E, welding rod suppress: by hydraulic press by wet mass medicinal powder along core wire length direction be coated in a step process after core wire on, make
Coating smooth surface, coating thickness is uniform, avoids core wire packet header；
F, it dries: the welding rod that step e makes is hung 24 hours in air, dried again at 300~400 DEG C after its dry tack free
Dry 1~2h to get.
5. the preparation method of low hydrogen type iron powder electrode according to claim 4, it is characterised in that: welding rod described in f step exists
The temperature hung in air is 15~25 DEG C, and the relative humidity of air is 50%~55%.
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