CN104741816A - Flux-cored welding wire for X120 pipeline steel welding and manufacturing method thereof - Google Patents
Flux-cored welding wire for X120 pipeline steel welding and manufacturing method thereof Download PDFInfo
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- CN104741816A CN104741816A CN201510100987.9A CN201510100987A CN104741816A CN 104741816 A CN104741816 A CN 104741816A CN 201510100987 A CN201510100987 A CN 201510100987A CN 104741816 A CN104741816 A CN 104741816A
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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
- B23K35/24—Selection of soldering or welding materials proper
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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
- B23K35/368—Selection of non-metallic compositions of core 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
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/406—Filled tubular wire or rods
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/10—Pipe-lines
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- Nonmetallic Welding Materials (AREA)
Abstract
The invention discloses a flux-cored welding wire for X120 pipeline steel welding. The flux-cored welding wire comprises a flux core and outer skin. The flux core comprises, by mass, 25%-50% of fluoride, 10%-20% of oxide, 2%-7% of carbonate, 6%-15% of nickel powder, 0.5%-3.5% of chromium powder, 3%-6% of molybdenum powder, 1%-3% of copper powder, 0.05%-0.1% of vanadium powder, 10%-15% of electrolytic manganese metal, 1%-3.5% of ferrocolumbium, 0.5%-2.5% of ferrotitanium and 1%-4% of silicon iron, wherein the sum of the mass percentage of all the components is 100%. According to the flux-cored welding wire for X120 pipeline steel welding, the adding amount of a denitrification agent and an deoxidizing agent is controlled, and the very good slag-gas-gold integrated self-protection effect is achieved in match with the slagging and gas making functions of the fluoride and the carbonate; the arcing and arc stabilizing performance is good, the molten pool fluidity is good, the splashed particles are fine, post-weld molten slag is even in covering, the slag is easily detached, and formed weld beads are refined and attractive.
Description
Technical field
The invention belongs to welding material of metal technical field, be specifically related to a kind of flux-cored wire for the welding of X120 pipe line steel, the invention still further relates to the preparation method of this flux-cored wire.
Background technology
Along with pipe line steel develops to long Distance geometry heavy caliber, high grade pipe line steel will become the main material of pipe-line.X70 and X80 obtains large-scale application in transfering natural gas from the west to the east, and the development of X90, X100, X120 pipe line steel also succeeds, and the problems demand of the development of the welding material therefore matched with it and packaged process and product development solves.Self-protection flux-cored wire is a kind of without the need to additional safeguard measure, is applicable to the welding material of field welding.Therefore, develop that welding technological properties is good, mechanical property is excellent, efficiency of construction is high at home and the self-protection flux-cored wire that can meet all-position welding construction seems particularly important.
Current X120 is application among a small circle, the flux-cored wire that market does not match with it, and mostly utilizes submerged arc welding, is difficult to conduct a field operation.
Summary of the invention
The object of this invention is to provide a kind of flux-cored wire for the welding of X120 pipe line steel, this flux-cored wire has self-shield effect; The starting the arc and stabilising arc functional, splashing particle is tiny, and postwelding slag covers evenly, and de-slag is easy, and appearance of weld is careful attractive in appearance.
Another object of the present invention is to provide a kind of preparation method of the flux-cored wire for the welding of X120 pipe line steel.
The technical solution adopted in the present invention is, for the flux-cored wire of X120 pipe line steel welding, comprise medicine core and crust, medicine core is composed of the following components by mass percentage: fluoride 25% ~ 50%, oxide 10% ~ 20%, carbonate 2% ~ 7%, nickel powder 6% ~ 15%, chromium powder 0.5% ~ 3.5%, molybdenum powder 3% ~ 6%, copper powder 1% ~ 3%, vanadium powder 0.05% ~ 0.1%, electrolytic manganese metal 10% ~ 15%, ferro-niobium 1% ~ 3.5%, ferrotianium 0.5% ~ 2.5%, ferrosilicon 1% ~ 4%, the mass percent sum of each component is 100%.
Feature of the present invention is also,
Fluoride is barium fluoride and lithium fluoride mass ratio is the mixture that 6:1 forms.
Oxide is the mixture of magnesia, alundum (Al2O3), titanium dioxide and silica.
Carbonate is sodium carbonate.
Another technical scheme of the present invention is, for the preparation method of the flux-cored wire of X120 pipe line steel welding, concrete steps are as follows:
Step 1, takes fluoride 25% ~ 50% respectively according to mass percent, oxide 10% ~ 20%, carbonate 2% ~ 7%, nickel powder 6% ~ 15%, chromium powder 0.5% ~ 3.5%, molybdenum powder 3% ~ 6%, copper powder 1% ~ 3%, vanadium powder 0.05% ~ 0.1%, electrolytic manganese metal 10% ~ 15%, ferro-niobium 1% ~ 3.5%, ferrotianium 0.5% ~ 2.5%, ferrosilicon 1% ~ 4%, the mass percent sum of each component is 100%;
Step 2, put in atomizing comminutor after fluoride, oxide and carbonate are carried out being dry mixed process in mixed powder machine, make binding agent with water and carry out granulation, grain diameter controls at 2 ~ 3mm;
Step 3, particle step 2 obtained is broken after oversintering, and filtering out granularity is 60 ~ 100 object medicinal powder;
Step 4, medicinal powder step 3 obtained mixes with nickel powder, chromium powder, molybdenum powder, copper powder, vanadium powder, electrolytic manganese metal, ferro-niobium, ferrotianium, ferrosilicon and obtains medicine core powder;
Step 5, medicine core powder step 4 obtained is placed on flux-cored wire production equipment charger, the common low carbon cold-rolled strip of size 14 × 0.6 (mm) is prevented putting on band machine, through steel strip cleaning device, carry out rolling U-type groove and adding powder operating after carrying out alkali cleaning, warm water cleaning, drying and processing, control filling rate 14.5 ~ 15.5%, carry out steel band by forming machine subsequently and heal up, form the welding wire of diameter 4.0mm;
Step 6, welding wire step 5 obtained is entering rough equipment, through 6 road tube reducing process, then on the paying out machine of finish draw production line, carries out the finish draw process of 9 grades of tube reducings, obtains the welding wire of diameter 1.2mm.
Feature of the present invention is also,
Fluoride, oxide and carbonate in step 1, dry 1.5h before taking at 250 DEG C; Nickel powder, chromium powder, molybdenum powder, copper powder, vanadium powder, electrolytic manganese metal, ferro-niobium, ferrotianium, ferrosilicon, dry 1.5h before taking at 150 DEG C.
In step 1, fluoride is barium fluoride and lithium fluoride mass ratio is the mixture that 6:1 forms; Oxide is the mixture of magnesia, alundum (Al2O3), titanium dioxide and silica; Carbonate is sodium carbonate.
Being dry mixed the processing time in step 2 is 0.5 ~ 0.8h.
In step 3, sintering temperature is 700 ~ 750 DEG C, and the time is 0.5 ~ 0.8h.
The invention has the beneficial effects as follows,
1. the present invention is used for the flux-cored wire of X120 pipe line steel welding, by controlling denitrogenation, the adding of oxygen agent, then being equipped with slag making, the gas making function of fluoride and carbonate, reaching the Trinitarian self-shield effect of good slag-gas-Jin; The starting the arc and stabilising arc functional, molten bath good fluidity, splashing particle is tiny, and postwelding slag covers evenly, and de-slag is easy, and appearance of weld is careful attractive in appearance.
2. the present invention is used for the preparation method of the flux-cored wire of X120 pipe line steel welding, medicinal powder after pretreatment, granularity is comparatively even, the proportion of mineral powder is greatly improved, the filling rate of medicinal powder can be good at controlling, and meanwhile, the mobility of medicinal powder is better, the welding wire medicinal powder produced is even, stable performance.
Accompanying drawing explanation
Fig. 1 is the metallographic structure figure of Weld pipe mill after the welding wire welding using the embodiment of the present invention 1 to prepare;
Fig. 2 is the metallographic structure figure of Weld pipe mill after the welding wire welding using the embodiment of the present invention 2 to prepare;
Fig. 3 is the metallographic structure figure of Weld pipe mill after the welding wire welding using the embodiment of the present invention 3 to prepare.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The present invention is used for the flux-cored wire of X120 pipe line steel welding, comprise medicine core and crust, medicine core is composed of the following components by mass percentage: fluoride 25% ~ 50%, oxide 10% ~ 20%, carbonate 2% ~ 7%, nickel powder 6% ~ 15%, chromium powder 0.5% ~ 3.5%, molybdenum powder 3% ~ 6%, copper powder 1% ~ 3%, vanadium powder 0.05% ~ 0.1%, electrolytic manganese metal 10% ~ 15%, ferro-niobium 1% ~ 3.5%, ferrotianium 0.5% ~ 2.5%, ferrosilicon 1% ~ 4%, the mass percent sum of each component is 100%.
Fluoride is barium fluoride and lithium fluoride mass ratio is the mixture that 6:1 forms.
Oxide is the mixture of magnesia, alundum (Al2O3), titanium dioxide and silica.
Carbonate is sodium carbonate.
The preparation method of the above-mentioned flux-cored wire for the welding of X120 pipe line steel, concrete steps are as follows:
Step 1, takes fluoride 25% ~ 50% respectively according to mass percent, oxide 10% ~ 20%, carbonate 2% ~ 7%, nickel powder 6% ~ 15%, chromium powder 0.5% ~ 3.5%, molybdenum powder 3% ~ 6%, copper powder 1% ~ 3%, vanadium powder 0.05% ~ 0.1%, electrolytic manganese metal 10% ~ 15%, ferro-niobium 1% ~ 3.5%, ferrotianium 0.5% ~ 2.5%, ferrosilicon 1% ~ 4%, the mass percent sum of each component is 100%;
Wherein fluoride, oxide and carbonate, dries 1.5h before taking at 250 DEG C; Nickel powder, chromium powder, molybdenum powder, copper powder, vanadium powder, electrolytic manganese metal, ferro-niobium, ferrotianium, ferrosilicon, dry 1.5h before taking at 150 DEG C;
Fluoride is barium fluoride and lithium fluoride mass ratio is the mixture that 6:1 forms; Oxide is the mixture of magnesia, alundum (Al2O3), titanium dioxide and silica; Carbonate is sodium carbonate;
Step 2, put in atomizing comminutor after fluoride, oxide and carbonate are carried out being dry mixed process 0.5 ~ 0.8h in mixed powder machine, make binding agent with water and carry out granulation, grain diameter controls at 2 ~ 3mm;
Step 3, particle step 2 obtained is 700 ~ 750 DEG C through sintering temperature, and the time is 0.5 ~ 0.8h, and then broken, filtering out granularity is 60 ~ 100 object medicinal powder;
Step 4, medicinal powder step 3 obtained mixes with nickel powder, chromium powder, molybdenum powder, copper powder, vanadium powder, electrolytic manganese metal, ferro-niobium, ferrotianium, ferrosilicon and obtains medicine core powder;
Step 5, medicine core powder step 4 obtained is placed on flux-cored wire production equipment charger, the common low carbon cold-rolled strip of size 14 × 0.6 (mm) is prevented putting on band machine, through steel strip cleaning device, carry out rolling U-type groove and adding powder operating after carrying out alkali cleaning, warm water cleaning, drying and processing, control filling rate 14.5 ~ 15.5%, carry out steel band by forming machine subsequently and heal up, form the welding wire of diameter 4.0mm;
Step 6, welding wire step 5 obtained is entering rough equipment, through 6 road tube reducing process, then on the paying out machine of finish draw production line, carries out the finish draw process of 9 grades of tube reducings, obtains the welding wire of diameter 1.2mm.
In the present invention, fluoride (25% ~ 50%) is as gas making, slag former, and its main component is BaF
2and LiF.The compound of Ba can support very short electric arc in welding process, and LiF, as a kind of fluoride, reduces viscosity coefficient of dross and fusing point except having, and outside the effect of increase slag fluidity, its topmost effect is stable arc.
Oxide (MgO, Al
2o
3, TiO
2, SiO
2), be very important a kind of component in self-protection flux-cored wire slag system, the improvement of welding technological properties and mechanical property is played a very important role.
Al
2o
3the viscosity of slag can be adjusted, improve the mobility of slag, make ripple fine and closely woven.But work as Al
2o
3when content is more than 5%, viscosity coefficient of dross also can raise, and viscosity is too high, and weld seam easily produces undercut.
MgO, TiO
2, SiO
2mainly regulate basicity, improve processing performance and the mechanical property of weld seam.
Al-Mg alloy is deoxidier conventional in self-protection flux-cored wire.Therefore Mg add the addition that can reduce Al, thus be beneficial to the content controlling Al in deposited metal.In alloy, the boiling point of Mg is lower, produces Mg steam under the effect of welding arc, can reduce the nitrogen partial pressure in arc atmosphere, but consumption crosses the very large flue dust of conference generation, and splashing is increased.Al has deoxidation, nitrogen fixation, is conventional deoxidier and nitrogen fixation agent, effectively can prevent the generation of pore in weld seam, play a very good protection.So the addition of A1-Mg should control in 7 ~ 12% scopes.
Mn is austenitizing stable element, can reduce the temperature of austenite to ferritic transformation.Mn in weld metal serves as solution strengthening constituent element, in the scope of Mn≤2.0%, along with the increase of Mn content, the quantity of acicular ferrite increases, the quantity of pro-eutectoid ferrite and ferrite side plate reduces, and make the grain size of acicular ferrite become more tiny, Mn also can improve the intensity of weld metal while improving weld metal toughness.Mn in welding wire can also play the effect of deoxidation, and can generate stable MnS with reaction of Salmon-Saxl, thus reduces the generation of low melting point phase FeS, is conducive to improving the heat resistanceheat resistant crackle of weld metal and the ability of lamellar tearing.In weld seam, the mechanical property of the content Resistance of Weld Metal of Mn has a great impact, with the increase of Mn content, yield strength and the hot strength of weld metal linearly increase, often increasing 0.01%Mn can make the yield strength of weld seam and hot strength increase 10MPa, although Mn does not increase the room temperature impact toughness of weld metal, significantly reduce brittle transition temperature.
Ni is austenite stabilizer element, and Ni is infinitely solid-solution in γ-Fe, in weld metal, also play solution strengthening effect, can increase acicular ferrite and separate out, thinning microstructure.The effect of Ni is similar to Mn, just weak compared with the effect of Mn, is weak reinforced alloys element.Within the scope of the whole cooling velocity of weld metal, Ni can make phase transition temperature reduce, and make ferrite side plate start transition temperature reduce degree be obviously greater than the reduction that acicular ferrite starts transition temperature.Time in weld metal containing Mn, this effect of Ni is more conducive to the formation of acicular ferrite.
Cr is strongly formed and stablizes ferritic element, and the basis of carbon steel adds the chromium of q.s, both can make steel in Oxidant, produce ferrochrome oxide (FeCr) that is a kind of and matrix strong bonded
2o
3passivating film; Effectively can improve again the pitting potential value of steel, reduce steel to the sensitiveness of spot corrosion.Cr improves corrosion proof effect and meets n/8 law.Along with the increase of Cr content, some intermetallic compounds are separated out the tendency formed and are increased, and the existence of these intermetallic compounds not only significantly reduces plasticity and the toughness of steel, and also reduces the corrosion resistance of steel in some conditions.
Mo is ferrite former, and Mo can resist chlorion (Cl
-) spot corrosion that produces, and Mo be added on the intensity increasing steel while, and toughness does not reduce.Mo Main Function improves corrosion resistance, cryogenic mechanics performance, elevated temperature strength and temper resistance.
Embodiment 1
Step 1, takes barium fluoride 428.6g, lithium fluoride 71.4g respectively, magnesia 20g, alundum (Al2O3) 30g, titanium oxide 20g, silica 30g, sodium carbonate 50g, nickel powder 60g, chromium powder 10g, molybdenum powder 50g, copper powder 10g, vanadium powder 0.5g, electrolytic manganese metal 150g, ferro-niobium 20g, ferrotianium 10g, ferrosilicon 39.5g;
Step 2, put in atomizing comminutor after barium fluoride, lithium fluoride, magnesia, alundum (Al2O3), titanium oxide, silica and sodium carbonate being carried out in mixed powder machine be dry mixed process 0.5h, make binding agent with water and carry out granulation, grain diameter controls at 2 ~ 3mm;
Step 3, broken after particle step 2 obtained sinters 0.8h at 700 DEG C, filtering out granularity is 60 ~ 100 object medicinal powder;
Step 4, the medicinal powder that step 3 is obtained with, nickel powder, chromium powder, molybdenum powder, copper powder, vanadium powder, electrolytic manganese metal, ferro-niobium, ferrotianium, ferrosilicon mix, and obtains medicine core powder;
Step 5, medicine core powder step 4 obtained is placed on flux-cored wire production equipment charger, the common low carbon cold-rolled strip of size 14 × 0.6 (mm) is prevented putting on band machine, through steel strip cleaning device, carry out rolling U-type groove and adding powder operating after carrying out alkali cleaning, warm water cleaning, drying and processing, control filling rate 15 ± 0.5%, carry out steel band by forming machine subsequently and heal up, form the welding wire of diameter 4.0mm;
Step 6, welding wire step 5 obtained is entering rough equipment, through 6 road tube reducing process, then on the paying out machine of finish draw production line, carries out the finish draw process of 9 grades of tube reducings, obtains the welding wire of diameter 1.2mm.
Embodiment 2
Step 1, takes barium fluoride 257.1g, lithium fluoride 42.9g respectively, magnesia 80g, alundum (Al2O3) 40g, titanium oxide 30g, silica 50g, sodium carbonate 70g, nickel powder 150g, chromium powder 19g, molybdenum powder 30g, copper powder 30g, vanadium powder 1g, electrolytic manganese metal 120g, ferro-niobium 35g, ferrotianium 25g, ferrosilicon 20g;
Step 2, put in atomizing comminutor after barium fluoride, lithium fluoride, magnesia, alundum (Al2O3), titanium oxide, silica and sodium carbonate being carried out in mixed powder machine be dry mixed process 0.6h, make binding agent with water and carry out granulation, grain diameter controls at 2 ~ 3mm;
Step 3, broken after particle step 2 obtained sinters 0.7h at 720 DEG C, filtering out granularity is 60 ~ 100 object medicinal powder;
Step 4, the medicinal powder that step 3 is obtained with, nickel powder, chromium powder, molybdenum powder, copper powder, vanadium powder, electrolytic manganese metal, ferro-niobium, ferrotianium, ferrosilicon mix, and obtains medicine core powder;
Step 5, medicine core powder step 4 obtained is placed on flux-cored wire production equipment charger, the common low carbon cold-rolled strip of size 14 × 0.6 (mm) is prevented putting on band machine, through steel strip cleaning device, carry out rolling U-type groove and adding powder operating after carrying out alkali cleaning, warm water cleaning, drying and processing, control filling rate 15 ± 0.5%, carry out steel band by forming machine subsequently and heal up, form the welding wire of diameter 4.0mm;
Step 6, welding wire step 5 obtained is entering rough equipment, through 6 road tube reducing process, then on the paying out machine of finish draw production line, carries out the finish draw process of 9 grades of tube reducings, obtains the welding wire of diameter 1.2mm.
Embodiment 3
Step 1, takes barium fluoride 419.3g, lithium fluoride 69.9g respectively, magnesia 60g, alundum (Al2O3) 30g, titanium oxide 20g, silica 40g, sodium carbonate 20g, nickel powder 100g, chromium powder 35g, molybdenum powder 60g, copper powder 20g, vanadium powder 0.8g, electrolytic manganese metal 100g, ferro-niobium 10g, ferrotianium 5g, ferrosilicon 10g;
Step 2, put in atomizing comminutor after barium fluoride, lithium fluoride, magnesia, alundum (Al2O3), titanium oxide, silica and sodium carbonate being carried out in mixed powder machine be dry mixed process 0.7h, make binding agent with water and carry out granulation, grain diameter controls at 2 ~ 3mm;
Step 3, broken after particle step 2 obtained sinters 0.5h at 750 DEG C, filtering out granularity is 60 ~ 100 object medicinal powder;
Step 4, the medicinal powder that step 3 is obtained with, nickel powder, chromium powder, molybdenum powder, copper powder, vanadium powder, electrolytic manganese metal, ferro-niobium, ferrotianium, ferrosilicon mix, and obtains medicine core powder;
Step 5, medicine core powder step 4 obtained is placed on flux-cored wire production equipment charger, the common low carbon cold-rolled strip of size 14 × 0.6 (mm) is prevented putting on band machine, through steel strip cleaning device, carry out rolling U-type groove and adding powder operating after carrying out alkali cleaning, warm water cleaning, drying and processing, control filling rate 15 ± 0.5%, carry out steel band by forming machine subsequently and heal up, form the welding wire of diameter 4.0mm;
Step 6, welding wire step 5 obtained is entering rough equipment, through 6 road tube reducing process, then on the paying out machine of finish draw production line, carries out the finish draw process of 9 grades of tube reducings, obtains the welding wire of diameter 1.2mm.
Embodiment 4
Step 1, takes barium fluoride 214.3g, lithium fluoride 35.7g respectively, magnesia 50g, alundum (Al2O3) 60g, titanium oxide 30g, silica 60g, sodium carbonate 70g, nickel powder 15g, chromium powder 5g, molybdenum powder 44g, copper powder 30g, vanadium powder 10g, electrolytic manganese metal 150g, ferro-niobium 35g, ferrotianium 25g, ferrosilicon 40g;
Step 2, put in atomizing comminutor after barium fluoride, lithium fluoride, magnesia, alundum (Al2O3), titanium oxide, silica and sodium carbonate being carried out in mixed powder machine be dry mixed process 0.8h, make binding agent with water and carry out granulation, grain diameter controls at 2 ~ 3mm;
Step 3, broken after particle step 2 obtained sinters 0.6h at 730 DEG C, filtering out granularity is 60 ~ 100 object medicinal powder;
Step 4, the medicinal powder that step 3 is obtained with, nickel powder, chromium powder, molybdenum powder, copper powder, vanadium powder, electrolytic manganese metal, ferro-niobium, ferrotianium, ferrosilicon mix, and obtains medicine core powder;
Step 5, medicine core powder step 4 obtained is placed on flux-cored wire production equipment charger, the common low carbon cold-rolled strip of size 14 × 0.6 (mm) is prevented putting on band machine, through steel strip cleaning device, carry out rolling U-type groove and adding powder operating after carrying out alkali cleaning, warm water cleaning, drying and processing, control filling rate 15 ± 0.5%, carry out steel band by forming machine subsequently and heal up, form the welding wire of diameter 4.0mm;
Step 6, welding wire step 5 obtained is entering rough equipment, through 6 road tube reducing process, then on the paying out machine of finish draw production line, carries out the finish draw process of 9 grades of tube reducings, obtains the welding wire of diameter 1.2mm.
The mechanical experimental results of the welding wire that embodiment 1,2,3,4 prepares is in table 1.
The corresponding mechanical experimental results of table 1 embodiment 1 ~ 4
Fig. 1 is the metallographic structure figure of Weld pipe mill after the welding wire welding using the embodiment of the present invention 1 to prepare; Fig. 2 is the metallographic structure figure of Weld pipe mill after the welding wire welding using the embodiment of the present invention 2 to prepare; Fig. 3 is the metallographic structure figure of Weld pipe mill after the welding wire welding using the embodiment of the present invention 3 to prepare, as can be seen from Fig. 1,2,3, embodiment 1,2,3 obtains the tissue of the rear Weld pipe mill of welding wire welding all based on lath-shaped bainite and granular bainite, separately have a little acicular ferrite and carbonization precipitate, the carbide that crystal boundary and intracrystalline are separated out plays the effect of strengthening.Granular bainite in embodiment 3 comparatively embodiment 1 and embodiment 2 slightly many, intensity is higher.
Claims (9)
1. for the flux-cored wire of X120 pipe line steel welding, it is characterized in that, comprise medicine core and crust, medicine core is composed of the following components by mass percentage: fluoride 25% ~ 50%, oxide 10% ~ 20%, carbonate 2% ~ 7%, nickel powder 6% ~ 15%, chromium powder 0.5% ~ 3.5%, molybdenum powder 3% ~ 6%, copper powder 1% ~ 3%, vanadium powder 0.05% ~ 0.1%, electrolytic manganese metal 10% ~ 15%, ferro-niobium 1% ~ 3.5%, ferrotianium 0.5% ~ 2.5%, ferrosilicon 1% ~ 4%, the mass percent sum of each component is 100%.
2. the flux-cored wire for the welding of X120 pipe line steel according to claim 1, is characterized in that, fluoride is barium fluoride and lithium fluoride mass ratio is the mixture that 6:1 forms.
3. the flux-cored wire for the welding of X120 pipe line steel according to claim 1, it is characterized in that, oxide is the mixture of magnesia, alundum (Al2O3), titanium dioxide and silica.
4. the flux-cored wire for the welding of X120 pipe line steel according to claim 1, it is characterized in that, carbonate is sodium carbonate.
5., for the preparation method of the flux-cored wire of X120 pipe line steel welding, it is characterized in that, concrete steps are as follows:
Step 1, takes fluoride 25% ~ 50% respectively according to mass percent, oxide 10% ~ 20%, carbonate 2% ~ 7%, nickel powder 6% ~ 15%, chromium powder 0.5% ~ 3.5%, molybdenum powder 3% ~ 6%, copper powder 1% ~ 3%, vanadium powder 0.05% ~ 0.1%, electrolytic manganese metal 10% ~ 15%, ferro-niobium 1% ~ 3.5%, ferrotianium 0.5% ~ 2.5%, ferrosilicon 1% ~ 4%, the mass percent sum of each component is 100%;
Step 2, put in atomizing comminutor after fluoride, oxide and carbonate are carried out being dry mixed process in mixed powder machine, make binding agent with water and carry out granulation, grain diameter controls at 2 ~ 3mm;
Step 3, particle step 2 obtained is broken after oversintering, and filtering out granularity is 60 ~ 100 object medicinal powder;
Step 4, medicinal powder step 3 obtained mixes with nickel powder, chromium powder, molybdenum powder, copper powder, vanadium powder, electrolytic manganese metal, ferro-niobium, ferrotianium, ferrosilicon and obtains medicine core powder;
Step 5, medicine core powder step 4 obtained is placed on flux-cored wire production equipment charger, common low carbon cold-rolled strip is prevented putting on band machine, through steel strip cleaning device, carry out rolling U-type groove and adding powder operating after carrying out alkali cleaning, warm water cleaning, drying and processing, control filling rate 14.5 ~ 15.5%, carry out steel band by forming machine subsequently and heal up, form the welding wire of diameter 4.0mm;
Step 6, welding wire step 5 obtained is entering rough equipment, through 6 road tube reducing process, then on the paying out machine of finish draw production line, carries out the finish draw process of 9 grades of tube reducings, obtains the welding wire of diameter 1.2mm.
6. the preparation method of the flux-cored wire for the welding of X120 pipe line steel according to claim 5, it is characterized in that, fluoride, oxide and carbonate in step 1, dry 1.5h before taking at 250 DEG C; Nickel powder, chromium powder, molybdenum powder, copper powder, vanadium powder, electrolytic manganese metal, ferro-niobium, ferrotianium, ferrosilicon, dry 1.5h before taking at 150 DEG C.
7. the preparation method of the flux-cored wire for the welding of X120 pipe line steel according to claim 5, is characterized in that, in step 1, fluoride is barium fluoride and lithium fluoride mass ratio is the mixture that 6:1 forms; Oxide is the mixture of magnesia, alundum (Al2O3), titanium dioxide and silica; Carbonate is sodium carbonate.
8. the preparation method of the flux-cored wire for the welding of X120 pipe line steel according to claim 5, it is characterized in that, being dry mixed the processing time in step 2 is 0.5 ~ 0.8h.
9. the preparation method of the flux-cored wire for the welding of X120 pipe line steel according to claim 5, it is characterized in that, in step 3, sintering temperature is 700 ~ 750 DEG C, and the time is 0.5 ~ 0.8h.
Priority Applications (1)
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| CN107186390A (en) * | 2017-05-11 | 2017-09-22 | 安徽飞弧焊业股份有限公司 | A kind of preparation method of grain roll flux-cored welding wire for overlaying welding |
| CN107186378A (en) * | 2017-05-11 | 2017-09-22 | 安徽飞弧焊业股份有限公司 | A kind of preparation method of pipe-line flux-cored wire |
| CN107350660A (en) * | 2017-07-31 | 2017-11-17 | 西安理工大学 | WH80 steel gas shielded type flux-cored wire and preparation method thereof |
| CN107378306A (en) * | 2017-07-31 | 2017-11-24 | 西安理工大学 | WH80 steel Self-protecting flux-cored wire and preparation method thereof |
| CN107900549A (en) * | 2017-10-20 | 2018-04-13 | 西安理工大学 | 25Cr2Ni4MoV self-protection flux-cored wires and preparation method thereof |
| CN109128548A (en) * | 2018-07-24 | 2019-01-04 | 谢颖贤 | A kind of tramcar tire welding process |
| CN110340567A (en) * | 2018-04-03 | 2019-10-18 | 青岛润乾高新科技有限公司 | A kind of low hydrogen flux-cored wire and preparation method thereof suitable for high-strength steel |
| CN110788520A (en) * | 2019-11-20 | 2020-02-14 | 桂林航天工业学院 | High-alloy steel wear-resistant flux-cored wire and preparation method thereof |
| CN113953713A (en) * | 2021-10-20 | 2022-01-21 | 西安理工大学 | Material and method for efficient high-strength butt welding of copper-steel composite plate |
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| CN107186390A (en) * | 2017-05-11 | 2017-09-22 | 安徽飞弧焊业股份有限公司 | A kind of preparation method of grain roll flux-cored welding wire for overlaying welding |
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| CN107900549A (en) * | 2017-10-20 | 2018-04-13 | 西安理工大学 | 25Cr2Ni4MoV self-protection flux-cored wires and preparation method thereof |
| CN110340567A (en) * | 2018-04-03 | 2019-10-18 | 青岛润乾高新科技有限公司 | A kind of low hydrogen flux-cored wire and preparation method thereof suitable for high-strength steel |
| CN110340567B (en) * | 2018-04-03 | 2021-04-02 | 青岛润乾高新科技有限公司 | Low-hydrogen flux-cored welding wire suitable for high-strength steel and preparation method thereof |
| CN109128548A (en) * | 2018-07-24 | 2019-01-04 | 谢颖贤 | A kind of tramcar tire welding process |
| CN110788520A (en) * | 2019-11-20 | 2020-02-14 | 桂林航天工业学院 | High-alloy steel wear-resistant flux-cored wire and preparation method thereof |
| CN110788520B (en) * | 2019-11-20 | 2021-07-23 | 桂林航天工业学院 | High-alloy steel wear-resistant flux-cored wire and preparation method thereof |
| CN113953713A (en) * | 2021-10-20 | 2022-01-21 | 西安理工大学 | Material and method for efficient high-strength butt welding of copper-steel composite plate |
| CN113953713B (en) * | 2021-10-20 | 2022-12-06 | 西安理工大学 | Material and method for efficient high-strength butt welding of copper-steel composite plate |
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