CN105728979A - Welding wire, preparation method thereof and method for reinforcing hot-working die material surface by using welding wire - Google Patents
Welding wire, preparation method thereof and method for reinforcing hot-working die material surface by using welding wire Download PDFInfo
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- CN105728979A CN105728979A CN201610204249.3A CN201610204249A CN105728979A CN 105728979 A CN105728979 A CN 105728979A CN 201610204249 A CN201610204249 A CN 201610204249A CN 105728979 A CN105728979 A CN 105728979A
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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
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
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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
- B23K35/40—Making wire or rods for soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies
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Abstract
The invention discloses a welding wire, a preparation method thereof and a method for reinforcing the hot-working die material surface by using the welding wire. The welding wire comprises, by mass, 85.2-89% of iron elements, 5.71-6.98% of chromium elements, 0.86-1.52% of carbon elements, 1.16-1.63% of manganese elements, 0.56-0.84% of vanadium elements, 0.55-1.0% of niobium elements, 1.39-1.63% of molybdenum elements, 0.5-1.1% of silicon elements and 0.08-0.1% of nitrogen elements. Through the improvement on the predesigned components and proportion of the welding wire, especially components and proportion of alloy powder forming a welding wire drawing material, the welding wire is particularly applicable to reinforcement of the hot-working die material working surface, and the high-temperature working performance of the hot-working die surface is improved.
Description
Technical field
The invention belongs to metal material surface technical field; more specifically; relate to a kind of welding wire and preparation thereof and the method applying this welding wire strengthening hot forming dies materials surface; the method wherein using this welding wire strengthening hot forming dies materials surface is based on gas shielded arc welding, and the strengthening being particularly suited for surface of hot working die modifiies.
Background technology
Under the effect of hot forming dies materials high temperature in-service, high pressure and pulsating stress, the heat exhaustion face crack of its working surface generation and high temperature wear are the principal modes of mould invalidation, account for the eighty per cant of all inefficacy moulds, and the preparation cost of mould significantly high (material and processing), production cycle length (generally wants the time of some months), greatly reduces mold use performance and life-span.In order to improve the life-span of mould, the anti-wear performance of its working surface and the fracture toughness of material need to be improved.
Traditional method is carbon alloy steel to carry out heat treatment to obtain the structure property of uniformity and to use hard-faced method to obtain the material of high tenacity, high-wear resistance.But the surface formed is due to the difference of rate of cooling, often forms uneven organizational structure, and the disperse effect that the carbide of main hardening constituent-chromium is in steel matrix is poor, high temperature stability performance is not enough, easily makes M in heat treatment process23C6、M7C3Deng carbide hard particle too grow up formation hard crisp phase.Research finds, if nitrogen can be used to replace a part of carbon that steel carries out solid solution and alloy strengthening, it is possible to while not losing matrix toughness, precipitate out the nitride alloy particle with high temperature stability performance, improve the hardness of steel, wearability and high-temperature stability；Further, nitrogen is compared to carbon and has better solution strengthening performance, and nitrogen compound also has better high-temperature stability and dispersivity simultaneously than carbide.
Current industry realizes nitrogen and replaces the method that part carbon uses mainly to have two kinds, a kind of logical nitrogen, then long-time High Temperature High Pressure inside when being cast steel so that it is in the base, solid solubility is high and uniformly in solid solution；Another kind is surface carburization, boronising, carburizing or binary, and multicomponent thermochemical treatment can form the strengthening layer of (micron order) a layer very thin, the surface that intensity is significantly high.First method is typically used as large batch of steel and produces, and such as H13 steel, but operation repaired again by the mould being not readily used for scene.Second method is consuming time oversize, it is generally required to four or five hours to more than tens, 20 individual hour, and the method needs vacuum environment, and operating difficulties, cost are high and sample size is restricted；Strengthening layer thickness is not enough, and strengthening effect is extremely uneven along thickness direction distribution, it is impossible to meet the requirement that the hot-work die being subject under circulation machinery/thermal stress effect is firm.
Summary of the invention
Disadvantages described above or Improvement requirement for prior art, it is an object of the invention to provide a kind of welding wire and preparation thereof, and the method applying this welding wire strengthening hot forming dies materials surface, wherein by the crucial composition designing welding wire in advance and proportioning, especially composition and the proportioning etc. that form the alloy powder of welding wire wire drawing raw material improve, this welding wire is made to be particularly applicable to the strengthening of hot forming dies materials working surface, compared with prior art can effectively solve the problem that the problem that the surface of hot working die high-temperature working performance strengthened at present is not enough by surface hardening, and easily there are the tissue deterioration phenomenons such as decarburization softening for a long time under the high temperature conditions in carbon alloy steel.
For achieving the above object, according to one aspect of the present invention, provide a kind of welding wire, it is characterized in that, this welding wire contains the ferrum element accounting for this Quality of Final Welding Wire 85.2%～89%, and include accounting for the chromium element of this Quality of Final Welding Wire 5.71%～6.98%, 0.86%～1.52% carbon, 1.16%～1.63% manganese element, 0.56%～0.84% v element, 0.55%～1.0% niobium element, the molybdenum element of 1.39%～1.63%, the element silicon of 0.5%～1.1% and 0.08%～0.1% nitrogen element.
As present invention further optimization, described welding wire include accounting for the chromium element of this Quality of Final Welding Wire 5.95%, 1.11% carbon, 1.2% manganese element, 0.6% v element, 0.6% niobium element, the molybdenum element of 1.50%, the element silicon of 0.6% and 0.08%～0.1% nitrogen element, surplus is ferrum element.
As present invention further optimization, described welding wire include accounting for the chromium element of this Quality of Final Welding Wire 5.71%, 1.4% carbon, 1.2% manganese element, 0.8% v element, 0.6% niobium element, the molybdenum element of 1.5%, the element silicon of 0.8% and 0.08% nitrogen element, surplus is ferrum element.
As present invention further optimization, described welding wire include accounting for the chromium element of this Quality of Final Welding Wire 6.98%, 0.86% carbon, 1.2% manganese element, 0.56% v element, 1.0% niobium element, the molybdenum element of 1.39%, the element silicon of 0.5% and 0.1% nitrogen element, surplus is ferrum element.
According to another aspect of the present invention, the invention provides a kind of method preparing above-mentioned welding wire, it is characterised in that comprise the following steps:
(1) preparation of alloy powder:
High carbon ferro-chrome, electrolytic manganese, ferrosilicon, molybdenum-iron, chromium nitride and iron powder mix homogeneously are obtained alloy powder, described high carbon ferro-chrome accounts for the 46% of described alloy powder quality, described electrolytic manganese accounts for the 6.5% of described alloy powder quality, described ferrosilicon accounts for the 4% of described alloy powder quality, described molybdenum-iron accounts for the 13.5% of described alloy powder quality, and described chromium nitride accounts for the 4.5% of described alloy powder quality；
(2) preparation of welding wire:
Being wrapped up by the alloy powder wire drawing machine that described step (1) obtains and obtain wire drawing raw material in H08A steel band, described alloy powder accounts for the 18%～20% of this wire drawing raw materials quality, more namely described wire drawing raw material wire drawing process is obtained welding wire.
As present invention further optimization, the diameter of the welding wire that described step (2) obtains is 1.2mm.
As present invention further optimization, the alloy powder in described step (1) also sieves process, and the order number of this alloy powder is not less than 60 orders.
It is another aspect of this invention to provide that the invention provides a kind of method applying above-mentioned welding wire strengthening hot forming dies materials surface, it is characterised in that comprise the following steps:
(1) use welding wire that hot forming dies materials to be fortified is carried out soldering:
Using hot forming dies materials to be fortified as mother metal, remove the oxide on this mother metal surface and pollutant；Then, at CO2Under gas shield, wire melting is welded on this mother metal surface, forms multiple tracks multilayer welding, this multiple tracks multilayer welding and hard facing alloy layer；
(2) temper:
The surface soldered that step (1) obtains is had the described mother metal of hard facing alloy layer, at N2Temper at least 2h when protective atmosphere, at 550 DEG C～580 DEG C, finally gives the hot forming dies materials of surface peening.
As present invention further optimization, the number of plies of the multi-pass welding in described step (1) is 3 layers～5 layers.
As present invention further optimization, the upper surface of the hard facing alloy layer that described step (1) obtains is also through grinding process.
As present invention further optimization, the hot forming dies materials described to be fortified in described step (1) is heat resisting steel；It is preferably martensite heat-resistant steel；It is preferably 1Cr11MoV steel.
Welding wire in the present invention is by designing composition and the proportioning (especially forming composition and the proportioning of the alloy powder of welding wire wire drawing raw material) of welding wire in advance so that this welding wire is particularly applicable to the strengthening of hot forming dies materials (such as heat resisting steel) working surface；By controlling the technological parameter of welding process, utilize CO2The method of gas shielded arc welding is at the nitrogen alloying hard facing alloy layer of common one layer of dense uniform of heat-resisting steel sheet and plate surface cladding, tough outer strong gradient martensitic steel material in forming a layer by the method for multi-pass welding；And move back stress by carrying out tempering at the temperature actually used close to mould, in drawing process, carboritride continues to precipitate out, form the distribution of the tiny and Hard Inclusion of disperse, hot forming dies materials after the strengthening obtained has good high temperature stability performance and mechanical property in 500～600 DEG C of temperature ranges, can improve the mold use life-span, and can be used for repairing the mould of easily damaged inefficacy；This intensifying method is simple, is not limited by mould own dimensions shape, it is simple to industrialized production.
The present invention adopts CO2Gas shield manual electric arc welding; (it is preferably the steel that toughness is higher at common heat resisting steel; it is more preferably martensite steel; such as 1Cr11MoV) one layer of high performance overlaying metal of surface cladding is in manufacture or repairs hot forged mould, efficiently to mould steel matrix, nitrogen element can be carried out alloy strengthening by the form of alloy state.Hard facing alloy is placed in N by postwelding2Lower 550 DEG C of pressure atmosphere carries out tempering 2 hours, eliminates residual stress and improves structure property, it is thus achieved that the new hot-work die working surface that mechanical behavior under high temperature is good.
The present invention applies special welding wire, based on the hot forming dies materials surface reinforcing method of gas shielded arc welding, there is quick easy-operating feature; strengthening layer thickness is millimeter even Centimeter Level; and the mould damage mechanisms under carrying out flaw detection and simulation different condition can be passed through; by adjusting component of weld wire, it is thus achieved that the working surface (wear-resisting, hardness, toughness difference) of different performance；Such as, region for easily caving in make it strengthen after intensity high, wearability after making it strengthen for region easy to wear is good, and for the region of not easy damaged, as long as the anti-wear performance before its strengthening meets instructions for use, then to the region of this not easy damaged then without more strengthening, thus reducing cost, on the other hand, it is also possible to make one set of die surface reach equivalent life as far as possible and lost efficacy, improve the material use efficiency of hot forming dies materials.To sum up, have the advantages that
1. implementation process is simple, it is possible to impaired mould is carried out reparation and remanufactures process by scene, and not by the restriction of die size shape, it is simple to industrialized production, and layer and mother metal binding ability are well, should not come off；
2. can significantly improve surface of hot working die service behaviour, especially mechanical behavior under high temperature, even can reach and exceed hot die steel self performance；
3. owing to the present invention is in common heat-resisting steel sheet and plate surface by hard facing alloy cladding, the die steel material consumption of costliness can be greatly saved, reduce production cost；
4. by regulating the composition proportion of welding wire, as formed the proportioning content of the alloy powder of wire drawing raw material, make the hard facing alloy layer being positioned at mother metal surface can comprehensively form tough outer strong gradient-structure with mother metal, be conducive to improving the fatigue resistance of mould.
Accompanying drawing explanation
Fig. 1 is that wire melting forms multiple tracks multilayer welding schematic diagram on mother metal surface, and rectangular box therein is effective working lining signal of hard facing alloy；This rectangular box generally lies in the 3rd layer of multi-pass welding and with upper strata；Below this rectangular box, closer to mother metal surface region (as the 1st layer weldering or the 2nd layer of weldering), due to the matrix constituent dilution that the hard facing alloy layer in these regions can be melted, toughness is higher and intensity is relatively low, generally not as the outmost surface of hot forming dies materials after strengthening；The number of plies of multi-pass welding is more many, and the thickness of effective working lining of hard facing alloy is more thick, and anti abrasive performance is more good；Considering that the number of plies is more many, cost is more high, and general multi-pass welding is three layers～five layer weldering.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.As long as just can be mutually combined additionally, technical characteristic involved in each embodiment of invention described below does not constitute conflict each other.
Embodiment 1
Welding wire in the present embodiment meets: this welding wire includes the ferrum element accounting for this Quality of Final Welding Wire 85.2%～89%, and include accounting for the chromium element of this Quality of Final Welding Wire 5.71%～6.98%, 0.86%～1.52% carbon, 1.16%～1.63% manganese element, 0.56%～0.84% v element, 0.55%～1.0% niobium element, the molybdenum element of 1.39%～1.63%, the element silicon of 0.5%～1.1% and 0.08%～0.1% nitrogen element.
In the present embodiment alloy powder used by account for the high carbon ferro-chrome of alloy powder gross mass 46wt%, the electrolytic manganese of 6.5wt%, the ferrosilicon of 4wt%, the molybdenum-iron of 13.5wt%, 4.5wt% chromium nitride be equipped with iron powder and form；Aforementioned proportion proportioning is based on conventional hot die steel H13 composition of steel, is optimized rear and adds what nitride obtained.In the concrete preparation process of alloy powder, it is be first according to said ratio to have weighed the powder of each constituents, then these powder are sieved (the order number of sieve can be more than 60 orders or 60 orders), then by these powder mix homogeneously, and with wire drawing machine by the powder wrapped of mix homogeneously in H08A steel band, make welding wire raw material.Then, by segmentation wire-drawing equipment, welding wire being obtained the about 18-20% of filling rate, diameter is the welding wire of 1.2mm.
Apply above-mentioned welding wire, adopt CO2Gas shielded arc welding cladding nitrogen alloying hard facing alloy material improves hot forming dies materials surface property.First, by common heat-resisting steel sheet and plate surface removal oxide skin and organic pollution, and it is preheating to uniform temperature, at CO2Under gas shield, use robotic arm that wire melting is coated to heat-resisting steel sheet and plate surface；Adopt multiple tracks multilayer welding, weld more than three to five layers to eliminate the matrix constituent dilution to hard facing alloy composition, and make welding interface be mutually lapped；Control rate of cooling, it is thus achieved that being finally organized as less retained austenite and be located therein lath martensite tissue of hard facing alloy.Additionally hard facing alloy layer can be carried out sanding and polishing and remove the part that surface is uneven, make hard facing alloy upper surface be effective working lining of hard facing alloy.Hard facing alloy after polishing is put into N2Carrying out tempering when protective atmosphere to move back stress and process 2 hours, temperature controls lower than about actual work temperature 10-20 DEG C of mould.Nitrogen partial pressure is not only possible to prevent hard facing alloy denitrogenation, it is also possible to improve the nitrogen content of alloyed layer further.In drawing process, hard facing alloy will precipitate out the tiny and carboritride of disperse continuously, these carbonitride alloy products mainly have titanium carbonitride, niobium carbonitrides, vanadium carbide nitride etc., there is good high temperature stability performance, it is not easily formed thick compound particle, causes decarburization denitrogenation in alloy substrate that hot mastication phenomenon occurs.
For 1Cr11MoV steel as mother metal, by 1Cr11MoV surface of steel plate emery wheel scale removal and other pollutant that thickness is 15mm；Above-mentioned welding wire is loaded in the wire feeder of automatic welding robotic arm, at CO2Under gas shield, automatic welding mode is adopted to carry out being welded on wire melting mother metal surface.The distance of welding wire and mother metal surface of steel plate is that 2-3mm is to ensure stablizing of electric arc；Arranging automatic welding parameter, if weldingvoltage is 28-29V, welding current is 230-240A, speed of welding is 55-60cm/min, and path of welding is the straight line of length 200mm, forms multiple tracks multilayer welding (as shown in Figure 1 on mother metal surface, layer is 5 layers), and make welding interface be mutually lapped.The initial hard facing alloy layer that wire melting is formed, its thickness is about 15mm；Then, remove the uneven layer of this initial hard facing alloy layer surface 2-3mm, retain 12mm-13mm hard facing alloy layer (include and and mother metal between transition zone), and expose the working surface of this hard facing alloy layer.
Finally, by the mother metal of covering hard facing alloy layer at N2Temper at least 2h when protective atmosphere, at 550 DEG C～580 DEG C, can substantially eliminate welding residual stress, finally give the hot forming dies materials of surface peening.
Above-described embodiment is to adopt automatic welding means, and welding wire can also by other modes (such as artificial CO2The modes such as gas shielded arc welding) molten solder is on mother metal surface.
The rate of cooling of hard facing alloy layer it is cooled into, it is necessary to meet the rate request of the common quick cooling of lath martensite, it is ensured that austenite umklappen is lath martensite tissue after welding wire in the present invention is melted.
Embodiment 2
Similar to Example 1, it is applicable to the welding wire on strengthening hot forming dies materials surface, its elementary composition proportioning can also adopt following ratio: welding wire include accounting for the chromium element of this Quality of Final Welding Wire 5.95%, 1.11% carbon, 1.2% manganese element, 0.6% v element, 0.6% niobium element, the molybdenum element of 1.50%, the element silicon of 0.6% and 0.08%～0.1% nitrogen element, surplus is ferrum element.
Embodiment 3
Similar to Example 1, it is applicable to the welding wire on strengthening hot forming dies materials surface, its elementary composition proportioning can also adopt following ratio: welding wire include accounting for the chromium element of this Quality of Final Welding Wire 5.71%, 1.4% carbon, 1.2% manganese element, 0.8% v element, 0.6% niobium element, the molybdenum element of 1.5%, the element silicon of 0.8% and 0.08% nitrogen element, surplus is ferrum element.
Embodiment 4
Similar to Example 1, it is applicable to the welding wire on strengthening hot forming dies materials surface, its elementary composition proportioning can also adopt following ratio: welding wire include accounting for the chromium element of this Quality of Final Welding Wire 6.98%, 0.86% carbon, 1.2% manganese element, 0.56% v element, 1.0% niobium element, the molybdenum element of 1.39%, the element silicon of 0.5% and 0.1% nitrogen element, surplus is ferrum element.
Welding wire in the present invention may inherit the impurity in H08A steel.
Those skilled in the art will readily understand; the foregoing is only presently preferred embodiments of the present invention; not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.
Claims (9)
1. a welding wire, it is characterized in that, this welding wire contains the ferrum element accounting for this Quality of Final Welding Wire 85.2%～89%, and include accounting for the chromium element of this Quality of Final Welding Wire 5.71%～6.98%, 0.86%～1.52% carbon, 1.16%～1.63% manganese element, 0.56%～0.84% v element, 0.55%～1.0% niobium element, the molybdenum element of 1.39%～1.63%, the element silicon of 0.5%～1.1% and 0.08%～0.1% nitrogen element.
2. welding wire as claimed in claim 1, it is characterized in that, described welding wire include accounting for the chromium element of this Quality of Final Welding Wire 5.95%, 1.11% carbon, 1.2% manganese element, 0.6% v element, 0.6% niobium element, the molybdenum element of 1.50%, the element silicon of 0.6% and 0.08%～0.1% nitrogen element, surplus is ferrum element；
Or, described welding wire include accounting for the chromium element of this Quality of Final Welding Wire 5.71%, 1.4% carbon, 1.2% manganese element, 0.8% v element, 0.6% niobium element, the molybdenum element of 1.5%, the element silicon of 0.8% and 0.08% nitrogen element, surplus is ferrum element；
Or, described welding wire include accounting for the chromium element of this Quality of Final Welding Wire 6.98%, 0.86% carbon, 1.2% manganese element, 0.56% v element, 1.0% niobium element, the molybdenum element of 1.39%, the element silicon of 0.5% and 0.1% nitrogen element, surplus is ferrum element.
3. the method preparing welding wire as claimed in claim 1 or 2, it is characterised in that comprise the following steps:
(1) preparation of alloy powder:
High carbon ferro-chrome, electrolytic manganese, ferrosilicon, molybdenum-iron, chromium nitride and iron powder mix homogeneously are obtained alloy powder, described high carbon ferro-chrome accounts for the 46% of described alloy powder quality, described electrolytic manganese accounts for the 6.5% of described alloy powder quality, described ferrosilicon accounts for the 4% of described alloy powder quality, described molybdenum-iron accounts for the 13.5% of described alloy powder quality, and described chromium nitride accounts for the 4.5% of described alloy powder quality；
(2) preparation of welding wire:
Being wrapped up by the alloy powder wire drawing machine that described step (1) obtains and obtain wire drawing raw material in H08A steel band, described alloy powder accounts for the 18%～20% of this wire drawing raw materials quality, more namely described wire drawing raw material wire drawing process is obtained welding wire.
4. the preparation method of welding wire as claimed in claim 3, it is characterised in that the diameter of the welding wire that described step (2) obtains is 1.2mm.
5. the preparation method of as claimed in claim 3 welding wire, it is characterised in that the alloy powder in described step (1) also sieves process, and the order number of this alloy powder is not less than 60 orders.
6. the method applying welding wire as claimed in claim 1 or 2 strengthening hot forming dies materials surface, it is characterised in that comprise the following steps:
(1) use welding wire that hot forming dies materials to be fortified is carried out soldering:
Using hot forming dies materials to be fortified as mother metal, remove the oxide on this mother metal surface and pollutant；Then, at CO2Under gas shield, wire melting is welded on this mother metal surface, forms multiple tracks multilayer welding, this multiple tracks multilayer welding and hard facing alloy layer；
(2) temper:
The surface soldered that step (1) obtains is had the described mother metal of hard facing alloy layer, at N2Temper at least 2h when protective atmosphere, at 550 DEG C～580 DEG C, finally gives the hot forming dies materials of surface peening.
7. the method strengthening hot forming dies materials surface as claimed in claim 6, it is characterised in that the number of plies of the multi-pass welding in described step (1) is 3 layers～5 layers.
8. the method strengthening hot forming dies materials surface as claimed in claim 6, it is characterised in that the upper surface of the hard facing alloy layer that described step (1) obtains is also through grinding process.
9. the method strengthening hot forming dies materials surface as claimed in claim 6, it is characterised in that the hot forming dies materials described to be fortified in described step (1) is heat resisting steel；It is preferably martensite heat-resistant steel；It is preferably 1Cr11MoV steel.
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| CN109175775A (en) * | 2018-10-23 | 2019-01-11 | 郑州大学 | A kind of weathering steel Q550NH flux-cored wire used for welding |
| CN110549031A (en) * | 2018-05-31 | 2019-12-10 | 上海电气电站设备有限公司 | High-heat-strength welding wire for dissimilar steel welding joint |
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| CN1727108A (en) * | 2004-05-18 | 2006-02-01 | 株式会社神户制钢所 | Welding wire for modified 9Cr-1Mo steel, and submerged-arc welding material |
| CN101062533A (en) * | 2006-04-28 | 2007-10-31 | 北京中煤大田耐磨材料有限公司 | Abrasion-proof pile-up welding flux-cored wire for roll squeezer |
| CN101602132A (en) * | 2009-07-15 | 2009-12-16 | 华北电力大学 | The preparation method who is used for the powder-cored welding wire and the cladding layer of surface of hot working die cladding |
| CN104785895A (en) * | 2015-05-05 | 2015-07-22 | 合肥东方节能科技股份有限公司 | Submerged arc surfacing manufacturing technology of looper roll for rolling mill |
| CN105057926A (en) * | 2015-09-22 | 2015-11-18 | 山东大学 | Special flux-cored wire for hot-working die repairing surfacing |
| CN105414798A (en) * | 2015-12-21 | 2016-03-23 | 四川鸿舰重型机械制造有限责任公司 | Flux-cored wire for coke-breaking roll overlaying welding |
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| CN110549031A (en) * | 2018-05-31 | 2019-12-10 | 上海电气电站设备有限公司 | High-heat-strength welding wire for dissimilar steel welding joint |
| CN109175775A (en) * | 2018-10-23 | 2019-01-11 | 郑州大学 | A kind of weathering steel Q550NH flux-cored wire used for welding |
| CN109175775B (en) * | 2018-10-23 | 2021-11-12 | 郑州大学 | Flux-cored wire for welding weathering resistant steel Q550NH |
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