CN101249591A - Nickel-based welding wire and preparation technique thereof - Google Patents
Nickel-based welding wire and preparation technique thereof Download PDFInfo
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Abstract
The invention relates to a nickel-based welding wire, with the chemical composition by mass percentage as follows: 0.047 percent of carbon, 0.26 percent of silicon, 2.67 percent of manganese, 0.020 percent of phosphorus, 0.006 percent of sulfur, 73.0 percent of nickel, 19.51 percent of chromium, 0.28 percent of titanium, 2.66 percent of niobium, 1.48 percent of iron and 0.064 percent of copper. The welding wire not only has good comprehensive mechanical performance, but also good process performance which even is better than that of imported welding wires, thereby being capable of replacing the imported UTP A 068HH welding wire.
Description
Technical field:
The invention belongs to a kind of nickel-based welding wire and preparation technology thereof.
Background technology:
The large-sized water turbine generator stator water-cooling winding bar of our company and the co-production of Switzerland ALSTOM company adopts new construction, new technology and new material at home for the first time.From the UTP A 068 HH nickel-based welding wire of ALSTOM company import, be equivalent to the ERNiCr-3 of ASME SFA-5.14 standard, though its welding quality can reach the specification requirement of product, price is higher.In order to reduce cost of goods manufactured, realize the nickel-based welding wire production domesticization, begin nickel-based welding wire has been carried out development and corresponding welding procedure test.
Summary of the invention:
The purpose of this invention is to provide a kind of the have good comprehensive mechanical performance and the nickel-based welding wire of processing performance.The approach that the present invention realizes is as follows: the present invention is a kind of nickel-based welding wire, and the chemical composition of this material mixture ratio contains by mass percentage: carbon (C) 0.047%; Silicon (Si) 0.26%; Manganese (Mn) 2.67%; Phosphorus (P) 0.020%; Sulphur (S) 0.006%; Nickel (Ni) 73.0%; Chromium (Cr) 19.51%; Titanium (Ti) 0.28%; Niobium (Nb) 2.66%; Iron (Fe) 1.48%; Copper (Cu) 0.064%.
Preparation method of the present invention is: adopt the vaccum sensitive stove model to be: ZG-0.025, and vacuum is less than 0.1Pa, and prepare: the mass percent meter contains: crome metal JCr99, carbon (C) 0.02%; Chromium (Cr) 99.8%, electrolytic nickel DJNi, carbon (C) 0.001%; Nickel (Ni) 99.9%, electrolytic manganese DJMn, carbon (C) 0.013%; Manganese (Mn) 99.88%; Phosphorus (P) 0.001%; Sulphur (S) 0.018%, titanium sponge MHT-100, carbon (C) 0.02%; Titanium (Ti) 99.8%, niobium bar Nb-1, niobium (Nb) 99.8%; Carbon (C) 0.025%, calcium-silicon Ca24Si60, carbon (C) 0.6%; Silicon (Si) 58%; Calcium (Ca) 26%, ladle require to be baked to more than 800 ℃; Loading sequence will be difficult for the ferroalloy of scaling loss with element, its charging sequence: electrolytic nickel DJNi, crome metal JCr99, electrolytic manganese DJMn, calcium-silicon Ca24Si60, niobium bar Nb-1, titanium sponge MHT-100, electrolytic nickel, crome metal adds earlier, all after the fusing, add the ferroalloy of easy scaling loss element again, electrolytic manganese metal and other raw material, energising fusing: can send electricity after furnace charge installs, begin to switch on 6-8 minute, after treating that rush of current stops, along with the fusing of furnace charge, the furnace charge that has been unkitted is packed into successively, clear until wholeization of furnace charge, thermometric is concise: 1600 ℃ ± 10 ℃ of temperature, time: 〉=10 minutes, tapping: fall power, coming out of the stove added titanium sponge in preceding 2 minutes, and fully stir, 1590 ± 10 ℃ of tapping temperatures are come out of the stove after the shutdown immediately, and slag mixes out; Cast: ladle requires to be baked to and toasts more than 800 ℃ more than 2 hours, cast immediately after coming out of the stove, 1560 ± 10 ℃ of pouring temperatures, big stream cast behind the first rill; The demoulding: cast finishes the demoulding rapidly after 1 minute, and electrode bar is pressed concentrated flat stacking of heat (batch) number, cool back finishing, and marking is got the finished product sample in excellent ingot termination, and the steel wire process is forged, rolling mill practice is made the finished product welding wire.
The trade mark of the present invention is defined as HSNiCr-3, has reached the standard of the ERNiCr-3 chemical composition of ASME SFA-5.14 standard, has also reached every technical performance of UTP A 068 HH simultaneously.Concrete contrast situation is as follows:
Welding wire chemical analysis contrast (%)
| Welding wire | C | Si | Mn | P | S | Ni | Cr | Ti | Nb | Fe | Cu |
| The ERNiCr-3 standard value | ≤ 0.10 | ≤0.50 | 2.50～ 3.50 | ≤ 0.030 | ≤ 0.015 | ≥ 67.0 | 18.0- 22.0 | ≤ 0.75 | 2.0- 3.0 | ≤ 3.0 | ≤ 0.50 |
| HSNiCr-3 measured value of the present invention | 0.047 | 0.26 | 2.67 | 0.020 | 0.006 | 73.0 | 19.51 | 0.28 | 2.66 | 1.48 | 0.064 |
| UTP A 068HH measured value of the present invention | 0.012 | 0.32 | 2.91 | 0.019 | 0.0017 | 74.02 | 19.74 | 0.22 | 2.41 | 0.52 | 0.10 |
In the development of HSNiCr-3 welding wire, catch this key link of tensile strength of weld metal, and consider nickel-base alloy bare welding filler metal because poor thermal conductivity, easily take place overheated and cause grain growth, reduce joint performance, and in welding, be prone to principal elements such as fire check, taked some technical measures: on basis, it is readjusted to the chemical analysis analytic demonstration.Specific practice is to reduce the chemical analysis of C, P, S.Because the S in the nickel alloy is segregation and Ni formation low melting point eutectic thing Ni in weld metal
3S
2, form one deck liquid film at crystal boundary, under the welding action of pulling stress, easily form solidification cracking, so answer strict its content of control; P can cause solidification cracking equally, and its content also should strict control.Split ability for the heat resistanceheat resistant that improves the welding wire deposited metal, add 2.67% manganese (Mn) and 2.66% niobium (Nb), and 0.28% titanium (Ti).Manganese (Mn) improves intensity, is a kind of good deoxidier, is again good desulfurizing agent, and improves the shape and the distribution of sulfide, weakens the harm of sulphur, reduces " hot-short " and reduces welding hot tearing sensitiveness, and sulphur increases the grain growth tendency.Niobium (Nb) can form carbide with carbon, forms intermetallic compound with iron, thereby the precipitation strength ferrite can hinder grain growth by crystal grain thinning.One of main crystal grain thinning element of titanium (Ti), the intensity of raising steel.Titanium (Ti) is to form the carbide element consumingly because big with the affinity of carbon, so be commonly used to as stabilizing agent, prevent chromium-nickel austenite at high temperature or the welding back produce grain attack, significantly crystal grain thinning reduces superheated susceptivity.
The heat input of control welding in the welding procedure test; be that welding current is unsuitable excessive; weldering speed should not be slow excessively; welding conditions are: adopt the welding method of argon tungsten-arc welding, electric current kind and polarity are straight polarity direct current, welding current (A) 100-150; arc voltage (V) 12-16; gas flow (l/min) 8-12, gas shield 99.99%Ar, speed of welding (mm/min) 60-80.Notice that interlayer temperature, interlayer temperature are not higher than 150 ℃ during multilayer welding (deposited two above layers are finished the multilayer welding that is welded as that the whole piece weld seam carried out); Overheated to reduce welding point.Want blunting of attention to receive arc when welding finishes, fill up arc crater.
The homemade nickel-based welding wire HSNiCr-3 of the present invention mainly is applicable to: the nickel-based welding wire of argon tungsten-arc welding (comprising GTAW and semi-automatic gas tungstun arc welding), metal argon arc welding, plasma arc welding (PAW); can be used for soldering stainless steel metal of the same race; the dissimilar metal welding or the built-up welding of stainless steel and nickel-base alloy, stainless steel and copper metal material, nickel-base alloy and copper metal material are applicable to do and fill silk and welding wire.Result of the test: by it is carried out weldability test, the result shows: the HSNiCr-3 welding wire is comparatively desirable welding material, and it not only has good comprehensive mechanical performance, but also has the favorable manufacturability energy even be better than the import welding wire.Therefore, available HSNiCr-3 welding wire substituting import one UTP A 068 HH welding wire.Along with succeeding in developing of new nickel-based welding wire, it indicates that Chinese large-sized hydrogenerator welding material has reached the advanced foreign technology level.Because HSNiCr-3 nickel-based welding wire of the present invention, in many products, be applied and respond well, therefore, the manufacturing cost of hydrogenerator has obtained certain reduction.
Description of drawings:
Fig. 1 is Forging Technology thermocouple displays temperature heating curves figure
Fig. 2 is rolling mill practice thermocouple displays temperature heating curves figure
The specific embodiment:
The chemical composition of material mixture ratio of the present invention contains by mass percentage: carbon (C) 0.047%; Silicon (Si) 0.26%; Manganese (Mn) 2.67%; Phosphorus (P) 0.020%; Sulphur (S) 0.006%; Nickel (Ni) 73.0%; Chromium (Cr) 19.51%; Titanium (Ti) 0.28%; Niobium (Nb) 2.66%; Iron (Fe) 1.48%; Copper (Cu) 0.064%.Through being investigated in many ways, external nickel-based welding wire just determines welding wire chemical composition of the present invention.Reduce the content of P, S in the debugging chemical composition, reason is: P can improve intensity, but can increase cold short and hot-short tendency as far as possible; S can improve machinability, but can increase the tendency of solidification cracking.Suitably reducing C content, because C can obviously reduce tough, the plasticity of weld seam, also is the essential element that influences solidification cracking.Dose Ti and Nb simultaneously, combine with C because of it is preferential and prevent that C from combining with Cr, take place, prevent intercrystalline corrosion thereby avoid lacking the Cr phenomenon.Add that Ni keeps good and moulds, toughness, crystal grain thinning.Add Mn and come deoxidation, desulfurization, reduce hot tearing sensitiveness, finally determine to be alloy system with Ni-Cr.
Preparation technology of the present invention: adopt the vaccum sensitive stove model to be: ZG-0.025, vacuum is less than 0.1Pa, and prepare: the mass percent meter contains: crome metal JCr99, carbon (C) 0.02%; Chromium (Cr) 99.8%, electrolytic nickel DJNi, carbon (C) 0.001%; Nickel (Ni) 99.9%, electrolytic manganese DJMn, carbon (C) 0.013%; Manganese (Mn) 99.88%; Phosphorus (P) 0.001%; Sulphur (S) 0.018%, titanium sponge MHT-100, carbon (C) 0.02%; Titanium (Ti) 99.8%, niobium bar Nb-1, niobium (Nb) 99.8%; Carbon (C) 0.025%, calcium-silicon Ca24Si60, carbon (C) 0.6%; Silicon (Si) 58%; Calcium (Ca) 26%, ladle require to be baked to more than 800 ℃; Loading sequence will be difficult for the ferroalloy of scaling loss with element, its charging sequence: electrolytic nickel DJNi, crome metal JCr99, electrolytic manganese DJMn, calcium-silicon Ca24Si60, niobium bar Nb-1, titanium sponge MHT-100, electrolytic nickel, crome metal adds earlier, all after the fusing, add the ferroalloy of easy scaling loss element again, electrolytic manganese metal and other raw material, energising fusing: can send electricity after furnace charge installs, begin to switch on 6-8 minute, after treating that rush of current stops, along with the fusing of furnace charge, the furnace charge that has been unkitted is packed into successively, clear until wholeization of furnace charge, thermometric is concise: 1600 ℃ ± 10 ℃ of temperature, time: 〉=10 minutes, tapping: fall power, coming out of the stove added titanium sponge in preceding 2 minutes, and fully stir, 1590 ± 10 ℃ of tapping temperatures are come out of the stove after the shutdown immediately, and slag mixes out; Cast: ladle requires to be baked to and toasts more than 800 ℃ more than 2 hours, cast immediately after coming out of the stove, 1560 ± 10 ℃ of pouring temperatures, big stream cast behind the first rill; The demoulding: cast finishes the demoulding rapidly after 1 minute, and electrode bar is pressed concentrated flat stacking of heat (batch) number, cool back finishing, and marking is got the finished product sample in excellent ingot termination, and the steel wire process is forged, rolling mill practice is made the finished product welding wire.
The concrete implementing process of the present invention requires as follows:
1. vacuum metling technology
1.1 material requirements:
| Title material | The raw material trade mark | Operative norm | Main chemical compositions, % |
| Crome metal | JCr99 | GB3211-1987 | Cr≥99，C≤0.02 |
| Electrolytic nickel | DJNi99.9 | GB6516-1997 | Ni≥99.5，C≤0.02，P，S≤0.003 |
| Electrolytic manganese metal | DJMn99.7 | YB/T051-93 | Mn≥99.7，C≤0.04，P≤0.005， S≤0.05 |
| Titanium sponge | MHT-100 | CB2524-2002 | Ti≥99.7，C≤0.02 |
| Calcium-silicon | Ca24Si60 | YB/T5051-1997 | Si55-65，Ca≥24，C≤0.8 |
| The niobium bar | Nb-1 | Gb/T6896-1998 | Nb≥99.456，Ta≤0.25，C≤0.03 |
1.2 burdening calculation
Chemical analysis %
| C | Si | Mn | P | S | Ni | Cr | Ti | Nb | Fe | Cu | |
| Standard analysis | ≤ | ≤0.50 | 2.50- | ≤ | ≤ | ≥ | 18.0- | ≤ | 2.0- | ≤ | ≤ |
| 0.10 | 3.50 | 0.030 | 0.015 | 67.0 | 22.0 | 0.75 | 3.0 | 3.0 | 0.50 | ||
| Internal control composition | 0.05 | 0.3 | 2.6- 3.3 | 0.020 | 0.01 | 70.0 | 19.5- 20.5 | 0.5 | 2.3- 2.7 | 1.5 | 0.4 |
Composition of raw material quality (%)
| The raw material trade mark | The raw material main component |
| JCr99 | Cr 99.8，C 0.02 |
| DJNi99.9 | Ni 99.9，C 0.001，P 0.0026，S 0.002 |
| DJMn99.7 | Mn 99.88，C 0.013，P 0.001，S 0.018 |
| MHT-100 | Ti 99.8，C 0.02， |
| Ca24Si60 | Si 58，Ca 26，C 0.6 |
| Nb-1 | Nb 99.8，C 0.025 |
1.3 smelting technology
The vacuum induction melting furnace model is ZG-0.025, and vacuum is less than 0.1Pa.
2. electroslag remelting process
3. Forging Technology
Open and forge 1100 ℃-1200 ℃ of temperature
Final forging temperature 〉=900 ℃
Type of cooling air cooling
Forging times 1 time (≤35Kg), concrete heating curves is seen accompanying drawing 1
4. rolling mill practice
1100 ℃-1200 ℃ of start rolling temperatures
Finishing temperature 〉=900 ℃
The chilling temperature air cooling, concrete heating curves is seen accompanying drawing 2
5. wire drawing process
5.1 technological process
Gu φ 8.0mm wire rod → molten processings, pickling → finishing inspection, oven dry → cold-drawn I, moltenly handle (well), pickling → finishing inspection, oven dry → cold-drawn II admittedly, moltenly handle (companys) → cold-drawn III admittedly, melt processing (company) → finished product, on-line cleaning → drum admittedly, take a sample to check → pack → put in storage
5.2 annealing process
5.2.1 shaft furnace annealing
| Classification | Diameter mm | Temperature ℃ | Temperature retention time min | The type of cooling |
| Wire rod annealing | ≥8.0 | 1050 | 60 | Water-cooled |
| Intermediate annealing | ≥3.0 | 1050 | 90 | Water-cooled |
5.2.2 continuous bright annealing
Welding procedure test: select the test mother metal.Because of the boss material of generator water-cooled winding stator bar is that import Ni300 nickel alloy, connecting plate material are T2 red copper and 1Cr18Ni9Ti stainless steel, so select these three kinds of materials (thickness of slab is 8mm) to be the test mother metal.Select wlding: adopt straight welding wire, diameter is φ 2.0mm, the import UTP A 068HH welding wire of long 1000mm and the HSNiCr-3 welding wire of newly developing.Select weld procedure specification: the welding method that adopts argon tungsten-arc welding, electric current kind and polarity are straight polarity direct current, the tungsten electrode diameter is φ 3mm, nozzle diameter is φ 10mm, preheat temperature is not less than 20 ℃, and interlayer temperature is not more than 150 ℃, welding current (A) 100-150, arc voltage (V) 12-15, gas flow (l/min) 10-12; Gas shield 99.99%Ar; Speed of welding (mm/min) 60-80.The processing performance of nickel-based welding wire, mechanical performance require: welding wire requires processing performance better, and moulding is attractive in appearance, and the tensile strength of weld metal should reach б b (Mpa) 〉=550.
Concrete content of the test is: the chemical analysis of deposited metal and mechanical test: result of the test shows: the result is qualified for homemade welding wire and import welding wire deposited metal chemical analysis, mechanical test reinspection, satisfies the standard value requirement.Result of the test is as follows:
Deposited metal chemical analysis contrast (%)
| C | Si | Mn | P | S | Cr | Ni | Nb | Ti | Cu | Fe | |
| 0.050 | 0.22 | 2.94 | 0.022 | 0.006 | 19.50 | 71.872 | 2.6 | 0.26 | 0.09 | 2.77 | HSNiCr-3 |
| 0.044 | 0.31 | 2.93 | 0.03 | 0.005 | 20.06 | 73.26 | 2.17 | 0.24 | 0.20 | 0.75 | UTP A 068 HH |
The contrast of deposited metal mechanical performance
| бbN/mm 2 | бsN/mm 2 | δ％ | AKV(J)20℃ | |
| 650 | 475 | 20.5 | 155、113、123、138、123 | HSNiCr-3 |
| 635 | 422 | 26.5 | 185、180、181、176、198. | UTP A 068 HH |
The chemical analysis analytical test of nickel-based welding wire: carry out the chemical composition analysis test of welding wire.Chemical analysis is carried out in sampling on homemade welding wire and import welding wire, and result of the test shows: newly Yan Zhi HSNiCr-3 welding wire and import welding wire all satisfy ASME SFA-5.14ERNiCr-3 welding wire chemical analysis standard value.The result is as follows:
| Welding wire | C | Si | Mn | P | S | Ni | Cr | Ti | Nb | Fe | Cu |
| The ERNiCr-3 standard value | ≤ 0.10 | ≤0.50 | 2.50～ 3.50 | ≤ 0.030 | ≤ 0.015 | ≥ 67.0 | 18.0- 22.0 | ≤ 0.75 | 2.0 3.0 | ≤ 3.0 | ≤ 0.50 |
| HSNiCr-3 breathes out electrical machinery plant's measured value | 0.047 | 0.26 | 2.67 | 0.020 | 0.006 | 73.0 | 19.51 | 0.28 | 2.66 | 1.48 | 0.064 |
| UTP A 068 HH breathes out electrical machinery plant's measured value | 0.012 | 0.32 | 2.91 | 0.019 | 0.0017 | 74.02 | 19.74 | 0.22 | 2.41 | 0.52 | 0.10 |
Homemade welding wire and import welding wire process performance comparison test: carry out butt weld welding with 1Cr18Ni9Ti corrosion resistant plate 6mm is thick.By contrast as can be seen: but all-position welding, and homemade welding wire HSNiCr-3 and import UTP A 068 HH welding wire process performance are suitable even be better than the import welding wire.Concrete condition is as follows:
| Electric current | 130-150A | 130-150A | 100-120A | 100-120A | 110-130 | 110-130 |
| Voltage | 11-13V | 11-13V | 1012V | 10-12V | 1012V | 10-12V |
| Homemade HSNiCr-3 downhand welding, horizontal position welding | Import UTP A 068 HH downhand welding, horizontal position welding | Homemade HSNiCr-3 vertical position welding | Import UTP A 068 HH vertical position welding | Homemade HSNiCr-3 overhead welding | Import UTP A 068 HH overhead welding | |
| The welding arc combustion stability | Electric arc is soft, tranquil | Electric arc is soft, tranquil | Electric arc is soft, tranquil | Electric arc is soft, tranquil | Electric arc is soft, tranquil | Electric arc is soft, tranquil |
| Striking | Easily | Easily | Easily | Easily | Easily | Easily |
| Surface forming | Well | Well | Well | Well | Well | Well |
| Pore, slag inclusion crackle, lack of penetration | Good (four groups) horizontal position welding of downhand welding good (four groups) | Good (four groups) horizontal position welding of downhand welding good (three groups) has one group of receipts arc that micro-crack is arranged | Four groups good | There is one group of receipts arc to have other three groups of micro-cracks good | Four groups good | Four groups good |
The angle welding soldering test of nickel alloy Ni300 and red copper T2: the red copper connecting plate is preheating to minimum 600 ℃ during welding; continue welding after being heated to minimum 600 ℃ again when in welding process, being lower than 600 ℃ again as red copper connecting plate temperature; 600 ℃ of preheat temperatures minimum (T2), 700 ℃ of interlayer temperatures, welding current 160-190A; arc voltage 16-18V, protective gas 99.99%Ar, speed of welding 60-80mm/min, tungsten electrode Φ 3.0mm, nozzle Φ 10.0mm.Electric current kind and polarity are straight polarity direct current, take off limit near T2 copper coin place welding current capping, close Ni300 plate place welding current.Adopt macro inspection method for welding quality, its result is as follows:
The qualification of welding procedure result of angle welding
| Welding wire | Minimum ℃ of preheat temperature (T2) | 5 of root of weld fusion situations | 5 of welding metal cracking situations | 5 of beat-affected zone crack situations |
| HSNiCr-3 | 600 | Fusion | Flawless | Flawless |
| UTP A 068 HH | 600 | Fusion | Flawless | Flawless |
The angle welding soldering test of nickel alloy Ni300 and corrosion resistant plate 1Cr18Ni9Ti: the stainless steel capital of nickel alloy Ni300 boss and 1Cr18Ni9Ti is an austenite structure, is prone to hot cracking tendency.It is overheated to reduce the molten bath that employing reduces welding current, improved the weld seam heat crack resistance.Welding material is selected straight welding wire of import UTP A 068 HH and the straight welding wire of homemade HSNiCr-3 for use, the thick t=8mm of test plate (panel), gas flow 8-12l/min, welding current 90-110A, arc voltage 10-12V, tungsten electrode Φ 3.0mm, nozzle Φ 10.0mm.The result is qualified for the postwelding macro-graph.
The qualification of welding procedure result of angle welding
| Welding wire | Minimum ℃ of preheat temperature | 5 of root of weld fusion situations | 5 of welding metal cracking situations | 5 of beat-affected zone crack situations |
| HSNiCr-3 | 20 | Fusion | Flawless | Flawless |
| UTP A 068 HH | 20 | Fusion | Flawless | Flawless |
The tape butt-seam welding machine tool performance test of nickel alloy Ni300 plate and red copper T2 plate:
Continue welding after being heated to minimum 600 ℃ again when being lower than 600 ℃ as the copper plate temperature in welding process again, interlayer temperature is controlled at 700 ℃.Welding current 190-210A, arc voltage 18-20V.In the enterprising windrow weldering of T2 copper plate groove, built-up welding thickness 5mm is again with the butt welding of Ni300 plate.On the T2 copper plate, add overlay cladding again with the Ni300 plate to the welding, be easy to like this welding.Because the thermal conductivity factor of red copper is big, heat leakage is fast, and welding point may take place not fuse or lack of penetration when the heat input was not enough.Take off limit slightly near T2 copper coin place welding current capping, close Ni300 plate place welding current.Welding conditions are as follows, minimum 20 ℃ of preheat temperature, 150 ℃ of interlayer temperatures, protective gas 99.99%Ar, gas flow 8-12l/min, welding current 130-140A, arc voltage 13-15V, back gouging.Result of the test shows: welding material is the HSNiCr-3 welding wire, and the mechanical performance of mother metal Ni300 plate and red copper T2 plate welding point can reach standard-required, and fracture is on mother metal T2 copper plate, and the fracture tensile strength sigma
b＞T2 copper plate tensile strength sigma
bBe 195Mpa, satisfy the tensile strength standard-required.Just curved (2) back of the body is bent (2) d=4a, and 180 degree are intact, satisfy the plasticity requirement.Result of the test is as follows:
The mechanical performance of nickel alloy Ni300 and red copper T2 plate welding point
| The welding material choosing | Welded condition | Tensile strength MPa | The fracture position | Just curved (2) back of the body is bent (2) d=4a |
| HSNiCr-3 | As-welded | 240、220 | Disconnected T2 | 180 degree are intact |
The tape butt-seam welding machine tool performance test of nickel alloy Ni300 plate and 1Cr18Ni9Ti corrosion resistant plate: material of test piece is the soldering test of nickel alloy Ni300 plate and 1Cr18Ni9Ti corrosion resistant plate, and test test plate (panel), method etc. are the same.Welding conditions: minimum 20 ℃ of preheat temperature, 150 ℃ of interlayer temperatures, protective gas 99.99%Ar, gas flow 8-12l/min, welding current 110A-140A, arc voltage 12-14V, back gouging.Result of the test shows: every mechanical performance meets the demands fully.
| Welding material | Welded condition | Tensile strength MPa | The fracture position | Just curved (2) back of the body is bent (2) d=4a |
| HSNiCr-3 | As-welded | 645、660 | Disconnected 1Cr18Ni9Ti | 180 degree are intact |
Welding point metallographic structure analysis: sample material 1Cr18Ni9Ti+Ni300 welding; The Ni300+T2 welding.After the weld joint samples of 25mm * 25mm * 8mm was polished, sample amplified 200 times of observations with 10% oxalic acid electrolytic etching.Analysis result: nickel-base alloy is γ solid solution+second phase precipitate, and the second phase precipitate is graininess and distributes 5 grades of grain sizes along the impurity direction; Crackle and incomplete fusion phenomenon are not seen in weld seam, melt run and heat affected area; Weld seam is an austenite, and the 1Cr18Ni9Ti mother metal is organized single-phase austenite, 8 grades of grain sizes.
T2 red copper mother metal is organized the unidirectional solid solution of a, crystal grain thick especially (not having evaluation criteria); Crackle and incomplete fusion phenomenon are not seen in weld seam, melt run and heat affected area; Weld seam is an austenite, and nickel-base alloy is γ solid solution+second phase precipitate, and the second phase precipitate is graininess and distributes 5 grades of grain sizes along the impurity direction.
Product simulation test: on water-cooled winding stator bar model, according to the specification requirement and the weld procedure specification of product, and requirement such as various quality, carried out the product simulation test.Test shows: newly Yan Zhi homemade HSNiCr-3 welding wire can satisfy the various manufacturing requirements of product fully.
Claims (2)
1. nickel-based welding wire, it is characterized in that: the chemical composition of this material mixture ratio contains by mass percentage: carbon (C) 0.047%; Silicon (Si) 0.26%; Manganese (Mn) 2.67%; Phosphorus (P) 0.020%; Sulphur (S) 0.006%; Nickel (Ni) 73.0%; Chromium (Cr) 19.51%; Titanium (Ti) 0.28%; Niobium (Nb) 2.66%; Iron (Fe) 1.48%; Copper (Cu) 0.064%.
2. according to the preparation technology of the described a kind of nickel-based welding wire of claim 1, it is characterized in that: adopt the vaccum sensitive stove model to be: ZG-0.025, vacuum is less than 0.1Pa, and prepare: the mass percent meter contains: crome metal JCr99, carbon (C) 0.02%; Chromium (Cr) 99.8%, electrolytic nickel DJNi, carbon (C) 0.001%; Nickel (Ni) 99.9%, electrolytic manganese DJMn, carbon (C) 0.013%; Manganese (Mn) 99.88%; Phosphorus (P) 0.001%; Sulphur (S) 0.018%, titanium sponge MHT-100, carbon (C) 0.02%; Titanium (Ti) 99.8%, niobium bar Nb-1, niobium (Nb) 99.8%; Carbon (C) 0.025%, calcium-silicon Ca24Si60, carbon (C) 0.6%; Silicon (Si) 58%; Calcium (Ca) 26%, ladle require to be baked to more than 800 ℃; Loading sequence will be difficult for the ferroalloy of scaling loss with element, its charging sequence: electrolytic nickel DJNi, crome metal JCr99, electrolytic manganese DJMn, calcium-silicon Ca24Si60, niobium bar Nb-1, titanium sponge MHT-100, electrolytic nickel, crome metal adds earlier, all after the fusing, add the ferroalloy of easy scaling loss element again, electrolytic manganese metal and other raw material, energising fusing: can send electricity after furnace charge installs, begin to switch on 6-8 minute, after treating that rush of current stops, along with the fusing of furnace charge, the furnace charge that has been unkitted is packed into successively, clear until wholeization of furnace charge, thermometric is concise: 1600 ℃ ± 10 ℃ of temperature, time: 〉=10 minutes, tapping: fall power, coming out of the stove added titanium sponge in preceding 2 minutes, and fully stir, 1590 ± 10 ℃ of tapping temperatures are come out of the stove after the shutdown immediately, and slag mixes out; Cast: ladle requires to be baked to and toasts more than 800 ℃ more than 2 hours, cast immediately after coming out of the stove, 1560 ± 10 ℃ of pouring temperatures, big stream cast behind the first rill; The demoulding: cast finishes the demoulding rapidly after 1 minute, and electrode bar is pressed concentrated flat stacking of heat (batch) number, cool back finishing, and marking is got the finished product sample in excellent ingot termination, and the steel wire process is forged, rolling mill practice is made the finished product welding wire.
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| CNA2007101445271A CN101249591A (en) | 2007-10-31 | 2007-10-31 | Nickel-based welding wire and preparation technique thereof |
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