39results about How to "Excellent slag removal performance" patented technology

The invention discloses a wear-resisting and high-hardness flux core wire. The wear-resisting and high-hardness flux core wire is composed of a flux core and a low-carbon cold-rolling steel tape sheath wrapped on the outer side of the flux core. The flux core comprises, by weight, 20-25 parts of low-carbon ferrochromium, 1.5-3 parts of titanium powder, 1-2 parts of nickel powder, 5-8 parts of calcium-silicon alloys, 2-4 parts of magnesium-aluminum alloys, 3-5 parts of electrolytic manganese, 1-2 parts of ferromolybdenum, 2.5-4 parts of ferroniobium, 1-2 parts of ferrovanadium, 3-5 parts of rare earth iron alloys, 3-5 parts of carbonate, 3-4 parts of graphite, 120-150 parts of iron powder, 0.5-1.5 parts of tungsten powder and 2-4 parts of calcium fluoride. The wear-resisting and high-hardness flux core wire has good welding performance, deposited metal tissue is compact, air holes and cracks are avoided, combination with base metal is good, performance is stable, and deposited metal has good wear resistance, corrosion resistance, high hardness and other performance.

The invention discloses an acid electrode with good process performance, and belongs to the technical field of welding materials. The electrode consists of a core wire and a coating. The coating is characterized by comprising the following components in percentage by weight: 25 to 35 percent of titanium pigment and rutile, 15 to 20 percent of selected ilmenite, 5 to 10 percent of marble and dolomite, 5 to 10 percent of white mud, 3 to 8 percent of mica, 8 to 15 percent of potash feldspar, 4 to 7 percent of quartz sand, 8 to 13 percent of manganese-silicon, 2 to 4.5 percent of chalk, 1 to 1.5 percent of sodium carbonate, 3 to 5 percent of organic matters and 0.5 to 2 percent of rare earth magnesium powder, atomized iron powder and aluminum powder, wherein the grain size of each component is 40 to 200 meshes. Potassium sodium water glass is used as a bonding agent; the modulus is 2.4 to 2.7; and the Baume concentration is 36 to 39. After uniformly mixing the components of the coating of the electrode, adding the water glass and stirring uniformly to obtain a mixture, a carbon steel covered electrode is manufactured by extruding the mixture on a core wire H08A; or a low-alloy steel electrode is manufactured by extruding the mixture on a low-alloy steel core wire. The electrode of the invention has the characteristics of high arc reignition, slag detachability and all-position welding adaptability, and low cost of electrode raw material.

The invention provides an ultralow-hydrogen high-toughness welding rod for welding of a water-diversion steel penstock in a hydropower station. A coating of the welding rod comprises, by mass, 40%-50% of marble, 2%-4% of dolomite, 18%-30% of fluorite, 2%-6% of quartz, 1%-3% of dehydrated feldspar, 1%-3% of zircon sand, 2%-4% of potassium titanate, 3%-6% of atomized ferrosilicon, 4%-8% of electrolytic manganese, 7%-12% of ferrotitanium, 1%-3% of light rare earth silicon iron, 0.5%-1.0% of ferromolybdenum, 2%-4% of nickel powder, and 0.5%-1.0% of rare earth fluoride. All the components are mixed according to the ratios to form the coating of the welding rod, potassium and sodium mixed water glass is added, an H04E welding core is coated with the mixture through a welding rod pressure coater, and the coated welding core is dried and shaped to form the electric welding rod. The deposited metal diffusible hydrogen content of the welding rod is 1.8 ml/100 g, the low temperature impact toughness at minus 20 DEG C is stabilized within the range from 160 J to 180 J, and the welding requirement of the water-diversion steel penstock in a 610 MPa hydropower station can be met.

The invention discloses a metal cast ingot slag-off system and method. The metal cast ingot slag-off system comprises a conveyer set, a structured light generator, an image capture device, an image processing module, an upper computer module, a lower computer control module, a display and a slag-off device. The structured light generator is arranged on one side of the conveyer set. The image capture device and the structured light generator are arranged in a pair, and the image capture device is located on the other side of the conveyer set and is used for capturing corresponding emitted lightand transmitting an image to the image processing module. The image processing module processes the image and data and calculates the thickness of a slag layer on a cast ingot before slag-off operation. The image processing module feeds back the thickness data of the slag layer to the upper computer module. The upper computer module compares the slag layer thickness with the preset slag layer thickness, a judgment is made, and an order is sent to the lower computer control module. The lower computer control module controls the slag-off device to conduct primary slag-off operation, supplementslag-off operation or discharging according to the received order. The thickness of the slag layer generated in the cast ingot casting process can be fast detected in real time, and thus movement parameters of a slag-off cutter on the slag-off device are controlled dynamically.

The invention relates to a high-strength steel gas-shielded welding flux-cored wire, which is composed of a steel sheath and a core powder, in terms of total weight percentage, C 0.04-0.10%, Si 0.3-0.9%, Mn 0.5-2.0%, Cr 5-10%, Ni 5.0-8.0%; in the core powder, the conversion value of Mg oxide MgO is 0.5-3.5%, the conversion value of Ti oxide TiO2 is 2-7%, and MgO/TiO2=0.2-0.8, fluorine Compound conversion value 0.5‑1.5, and an appropriate amount of arc stabilizer, the rest is iron. The tensile strength of the prepared weld metal is above 980MPa, which is suitable for all-position welding.

The invention discloses a welding wire for low alloy steel. The welding wire is prepared from components as follows: C, Si, Cu, Mg, Nb, Al, K, Mn, Ni, Cr, Ti, Sr, Mo, V, Nd, Ce and the balance of Fe and inevitable impurities. The welding wire for low alloy steel has good welding performance, during welding, electric arc is stable, small splashing is produced, welding fluid liquidity is good, the weld surface is uniformly covered with welding slag, so that interfacial tension of the welding slag and deposited metal is increased, slag detachability is improved, formation of the obtained weld is good, the weld surface is free of cracks and pores, and the deposited metal has good mechanical properties.

The invention provides an active agent for laser welding of aluminum-magnesium alloy and an application of the active agent and solves the problem about welding penetration of a thick plate by aluminum alloy laser welding. The active agent is prepared from the following raw materials in percentage by mass: 45%-55% of silicon dioxide, 16%-22% of calcium oxide, 10%-18% of manganese dioxide and 29%-5% of carbonate of calcium. According to the active agent, non-toxic components are used for substituting for highly toxic fluoride; due to the addition of Ca, Mn and the other elements, the arc shapeand the surface tension of a welding molten pool are changed, and the deslagging property of the active agent and the appearance of the aluminum-magnesium alloy after welding are enhanced; performanceof the active agent is enhanced by strictly controlling the particle size range. The laser welding quality of the aluminum alloy is ensured while the welding penetration is enhanced.

The invention relates to the technical field of biological enzyme preparations, in particular to a beta amylase production system and a production process thereof. The beta-amylase production system comprises a size mixing process, a filtering process, a concentration and impurity removal process, an enzyme liquid stabilizing process and a material residue treatment process. Wherein in the filtering process, a plate-and-frame filter press is used for carrying out filter-pressing separation on feed liquid; grooves, through grooves, push blocks, pull blocks, first springs and second springs are arranged on the filter plate of the plate-and-frame filter press, in the extrusion process of the filter plate, the push blocks located at the four opposite angles of the filter plate slide downwards along the first grooves, the push blocks push the pull blocks to slide outwards along the through grooves in the downward sliding process, and in the outward sliding process of the pull blocks, the pull blocks are pushed to slide outwards along the through grooves. The drag hooks drive the filter cloth to expand outwards, so that the filter cloth is tensioned outwards along the four corners of the filter plates, the filter cloth is automatically leveled in the pressing process, and the situation that the leakage amount of mixed liquid between the filter plates is large due to the fact that the filter cloth is wrinkled in the pressing process is prevented.

The invention relates to the field of metal smelting preparation, in particular to an automatic deslagging device of a smelting furnace, which comprises a liquid storage tank, a first discharging channel, a deslagging furnace, a stirring mechanism, a second discharging channel and a third discharging channel; a stirring mechanism is arranged on the deslagging furnace and comprises a first stirring part, a second stirring part, a first bearing frame and a gearbox, the first stirring part comprises a first stirring shaft and a first stirring blade, the second stirring part comprises a second stirring shaft and a second stirring blade, and the second stirring shaft is rotatably connected with the first bearing frame; a side wall opening is arranged on the upper portion of the deslagging furnace, a feeding end of the third discharging channel is communicated with the bottom of the deslagging furnace, and a feeding end of the second discharging channel is communicated with the upper portion of the deslagging furnace through the side wall opening; and in the vertical direction, the upper portion of the second stirring blade is not lower than the lowest point of the side wall opening, and the lower portion of the second stirring blade is not higher than the lowest point of the side wall opening. Continuous and automatic refining and deslagging are realized, the labor intensity is reduced, and the operation efficiency is improved.

The invention relates to a slag fluxing agent for molten steel and a production method of the slag fluxing agent. The slag fluxing agent comprises components in parts by weight as follows: 30-50 parts of potassium feldspar, 30-50 parts of low albite and 10-20 parts of fused quartz sand, wherein in the potassium feldspar, the content of K2O is smaller than 10%, the content of Na2O is 3%-5%, and the content of SiO2 is larger than 65%; in the low albite, the content of K2O is smaller than 1%, the content of Na2O is smaller than 10%, and the content of SiO2 is larger than 65%; the content of SiO2 in the fused quartz sand is larger than 99%. The slag fluxing agent has high slag accretion capability, can cleanly remove slag, reduces iron loss, improves the slag removal effect, can remove wall hanging residues, absorbs inclusions in steel, purifies the molten steel and has high slag fluxing performance; the content of original slag accounting for about 5% of the molten steel can be reduced to about 1% after slag fluxing, the quality of steel is improved to a great extent, and use demands of a user are met.