31results about How to "Good fluidity of molten pool" patented technology

The invention discloses a wire rod for a submerged arc automatic welding wire with a tensile strength of 650 MPa for a coating-free weathering steel bridge, which belongs to the field of weathering steel welding materials. : 0.12~0.32, Mn: 1.60~2.20, P: ≤0.015, S: ≤0.005, Cr: 0.25~0.55, Ni: 0.6~1.10, Cu: 0.20~0.35, Mo: 0.10~0.40, Ti: 0.02~0.15 , Nb: 0.010~0.025, Ca: 0.005~0.030, Zr: ≤ 0.030, Ce: ≤ 0.025, B ≤ 0.0010, the balance is Fe and other inevitable impurities. Based on the above-mentioned wire rod for submerged arc automatic welding wire, the present invention also provides a submerged arc automatic welding wire with a tensile strength of 650 MPa for a coating-free weathering steel bridge. The welding wire and wire rod of the invention are suitable for the welding of non-painted bridge steel bridges with a tensile strength of 650MPa, wherein the tensile strength of the deposited metal is greater than or equal to 650MPa; the yield strength is greater than or equal to 500MPa; the elongation is greater than or equal to 22%; Low temperature impact energy KV2≥80J.

The invention discloses a low-hydrogen alkaline electrode for online welding of X80 pipeline steel. The low-hydrogen alkaline electrode comprises a core wire and a coating. The coating comprises, by weight, from 40% to 45% of marble, from 15% to 20% of fluorite, from 2% to 4% of titanium dioxide, from 6% to 10% of rutile, from 7% to 10% of ferrotitanium, from 4% to 7% of low-carbon ferromanganese, from 2% to 5% of ferrosilicon, from 6% to 10% of iron powder, from 2.5% to 3% of synthetic mica, from 1.8% to 2.2% of rare earth and from 2% to 2.4% of microcrystal fibers, and the sum of the weight percents of the components is 100%. The electrode made from the coating is good in arc stabilization performance, a molten pool is good in flowability, splashing particles are tiny, post-welding slag detachability is good, slag coverage is uniform, and formed weld joints are delicate and attractive. Besides, the content of diffusible hydrogen in deposited metal of the manufactured electrode is effectively controlled.

The invention discloses a low-hydrogen basic welding rod for welding 1Ni9 steel. The low-hydrogen basic welding rod comprises a coating and a welding core; the coating consists of the following materials according to a weight ratio of: 34-48% of marble, 20-27% of fluorite, 2-8% of quartz, 4-5% of zircon sand, 3-10% of rutile, 1-3% of titanium dioxide, 2-5% of ferrosilicon, 1-3% of rare earth ferrosilicon, 4-11% of ferrotitanium, 2-8% of mid-carbon ferromanganese, 1-3% of synthetic mica, and 1-2% of sodium carbonate; and the sum of the weight percentages of the components is 100%. The invention further discloses a preparation method of the low-hydrogen basic welding rod, comprising the following steps of: mixing powder with a binding agent and then pressing a mixture into a cylindrical powder cluster; placing the cylindrical powder cluster in a press; placing the welding core on a wire feeding table of the press; operating the press to manufacture the welding rod; and grinding the head and the tail and then gradually heating and drying, so as to obtain the low-hydrogen basic welding rod. According to the low-hydrogen basic welding rod provided by the invention, the content of diffusible hydrogen in weld metal is low, so that the requirement on the low-hydrogen content can be met; the rigidity under a liquid nitrogen temperature is better; and the engineering requirements can be met.

The low-temperature and high-toughness welding wire for X80 pipeline steel disclosed by the invention is composed of the following components by mass percentage: C≤0.06%, Si 0.15-0.27%, Mn 1.30-1.50%, P≤0.003%, S≤0.003% , Ni 1.20~2.40%, Cr 0.02~0.08%, Cu 0.03~0.05%, Nb 0.02~0.05%, V 0.005~0.010%, Ti 0.06~0.10%, Mo 0.10~0.20%, Al 0.01~0.02%, B ≤0.005%, N≤0.005%, the balance is Fe, and the sum of the mass percentages of the above components is 100%. The welding wire solves the problem of insufficient low temperature toughness of the weld. The invention also discloses a preparation method of a low-temperature and high-toughness welding wire for X80 pipeline steel.

A welding stick for the all-position welding of X100 pipeline steel comprises a flux core and a covering. The flux core comprises, by mass, 40-60% of fluoride, 10-20% of oxide, 2-6% of carbonates, 12-16% of Al-Mg alloy powder, 2-10% of nickel powder, 2-5% of chromium powder, 3-8% of molybdenum powder, 5-10% of electrolytic manganese metal and 0-3% of ferroniobium, and the sum of the mass percents of the components is 100%. According to the welding stick for the all-position welding of the X100 pipeline steel, adding of a denitrification agent and a deoxidizing agent (namely the Al-Mg alloy powder and ferromanganese) is controlled, the slagging and gas making functions of the fluoride and the carbonates are matched, and the good slag-gas-metal triune self-protection effect is achieved. The arcing and arc stability properties are good, the fluidity of a weld pool is good, splashing particles are small, postwelding slag coverage is even, slag removal is easy, and the appearance of weld seams is delicate and attractive.

The invention discloses a high-toughness low-hydrogen alkaline electrode, which includes a coating and a welding core. The coating is composed of the following materials in percentage by weight: 38%-44% of marble, 20%-25% of fluorite, and 3% of zircon sand %~5%, ferrosilicon 1%~5%, ferrotitanium 10%~15%, medium carbon ferromanganese 5%~7%, titanium dioxide 2%~4%, mica 3%~6%, microcrystalline fiber 1.5% %~2%, nickel powder 1.2%~1.8%, mixed rare earth 1%~1.5%, the sum of the weight percentages of the above components is 100%. The invention also discloses its preparation method. After the coating material is mixed with potassium sodium mixed water glass, it is pressed into a cylindrical powder and put into a pressure coating machine, and the cylindrical powder is pressure-coated on the H08A welding core to make an electrode. , and then grind the head and tail and then dry it. The invention does not need preheating before welding and heat treatment after welding when welding high-strength steel, effectively controls the diffusible hydrogen content of deposited metal, and has a simple preparation method.

The invention provides a low-hydrogen basic welding electrode for 1Ni9 low-temperature steel welding. The low-hydrogen basic welding electrode comprises a welding core and a coating, wherein the welding core consists of the following components in percentage by mass: 0.01 to 0.03 percent of carbon, 0.5 to 0.9 percent of manganese, 0.2 to 0.4 percent of silicon, 21 to 24 percent of chromium, 2.5 to 3.5 percent of iron, 8.5 to 9.5 percent of molybdenum, 0.02 to 0.04 percent of titanium, 4 to 4.5 percent of niobium, 0.15 to 0.20 percent of nitrogen, at most 0.01 percent of sulfur, at most 0.01 percent of phosphorus and the balance of nickel; the coating comprises the following components in percentage by mass: 34 to 48 percent of marble, 17 to 24 percent of fluorite, 2 to 6 percent of zircon sand, 1 to 4 percent of ferrosilicon, 5 to 12 percent of ferrotitanium, 3 to 5 percent of mid-carbon ferromanganese, 2 to 5 percent of titanium dioxide, 2 to 5 percent of rutile, 2 to 6 percent of mica, 0.7 to 1 percent of alkali and 1 to 3 percent of mixed rare earth, and the sum of the mass percentage of the components is 100 percent. The low-hydrogen basic electrode provided by the invention solves the problems of poorer performance and high import price of existing welding electrodes.

The invention discloses a low-hydrogen basic electrode for 25Cr2Ni4MoV alloy steel welding, which comprises a core wire and a coating, wherein the coating is prepared from the following materials in percentage by weight: 40-47% of marble, 16-24% of fluorite, 3-6% of quartz, 3-6% of zircon sand, 4-12% of rutile, 6-11% of ferrotitanium, 4-8% of low-carbon ferromanganese, 2-5% of ferrosilicon, 1-3% of rare earth ferrosilicon, 2.8-3.2% of synthetic mica and 0.5-1.5% of soda ash, and the sum of the weight percentage of all the components is 100%.The electrode prepared from the coating has the advantages of high arc stabilizing performance, good molten pool fluidity, fine splashing particles, easier deslagging after welding, uniform slag covering and delicate and attractive molded weld. Besides, the diffusible hydrogen content of the deposited metal of the prepared electrode is effectively limited.