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

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.

The invention discloses a low-hydrogen basic electrode for welding FV520 (B) stainless steel, comprising a core wire and an electrod covering, wherein the electrode covering comprises the following materials in weight percentage: 35%-45% of marble, 18%-26% of fluorite, 6%-9% of quartz, 3%-6% of zircon sand, 6%-12% of rutile, 1%-3% of ferrosilicon, 6%-10% of ferrotitanium, 5%-11% of low-carbon ferromanganese, 1%-3% of rare-earth ferrosilicon and 0.5%-1.5% of sodium carbonate, and the sum of the weight percentages of the components is 100%. Compared with the traditional special imported electrode for the FV520 (B) stainless steel, the electrode made of the electrode covering has the advantages of favorable arc stabilization performance, good fluidity of a molten bath, less splash and dust, easier slag removal after welding, uniform slag coverage, and delicate and attractive welding joint formation. The content of diffusible hydrogen generated by using the developed electrode for depositing metal is effectively controlled and meets the requirements of low-carbon contents.

A welding wire for welding FV520B martensitic stainless steel comprises a powder core and an outer skin. The powder core is composed of, by mass, 15 percent to 35 percent of rutile, five percent to 15 percent of zircon sand, two percent to five percent of quartz, four percent to 10 percent of feldspar, two percent to five percent of sodium carbonate, two percent to five percent of aluminum oxide, six percent to 12 percent of aluminum magnesium alloy, five percent to 10 percent of electrolytic manganese metal, 18 percent to 25 percent of chromium powder, six percent to 10 percent of nickel powder, two percent to six percent of ferroniobium and one percent to 10 percent of molybdenum powder, and the sum of the mass percent of all the components is 100 percent. The welding wire is good in arcing and arc stabilizing performance, good in molten pool fluidity, fine in splashed particle and even in postwelding slag coverage, and enables deslagging to be easy, welding joint forming is meticulous and attractive, the welding wire is suitable for large linear energy welding, the organization and performance obtained through the prewelding preheating and postwelding heat treatment process can meet actual production needs, and the welding requirement for FV520B martensitic stainless steel is met.

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.

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 flux-cored wire for welding X90 pipeline steel. The flux-cored wire for welding the X90 pipeline steel comprises a flux core and skin. The flux core comprises, by mass, 30%-55% of fluoride, 10%-20% of oxide, 2%-5% of carbonate, 7%-10% of Al-Mg, 8%-15% of nickel powder, 0.5%-2.5% of chromium powder, 3%-6% of molybdenum powder, 1%-3% of copper powder, 10%-15% of electrolytic manganese metal, 1%-4% of ferrocolumbium, 0.5-1.5% of ferrotitanium, and 2%-4% of ferrosilicon. According to the flux-cored wire for welding the X90 pipeline steel, through control over the addition of the denitrfying agent and the oxygen agent and the slag making function and the gas making function of the fluoride, a good slag-gas-metal triune self-protection function is achieved; the arcing performance and the arc stabilizing performance are good, the fluidity of a molten bath is high, splashed particles are fine and small, slag is evenly covered after welding, slag removal is easy, and formed weld joints are delicate and attractive.

The invention relates to a welding method, in particular to an SA-213S30432 material membrane type tube panel welding method. The problems that an SA-213S30432 material membrane type tube panel is large in welding hot crack trend and large in restraint stress, the risk of welding crack generation is increased, stainless steel is poor in heat conductivity and large in thermal expansion coefficient, and deformation is extremely prone to occurring due to welding are solved. The SA-213S30432 material membrane type tube panel welding method comprises the following steps that S1, after a plurality of pipes and flat steel made of SA-213S30432 are horizontally placed according to the pipe panel layout, a plurality of pulse gas metal shield welding power sources are arranged; S2, a plurality of welding guns are arranged, each welding gun is connected with the corresponding pulse gas metal arc welding power source, the welding guns are arranged on the upper side and the lower side of each pipe and the flat steel correspondingly, and the welding guns point to the joints of the pipes and the flat steel; and S3, an ER308LSi solid gas shielded welding wire is adopted for conducting uniform-speed welding on the pipes and the flat steel. Welding seams are formed uniformly and fully, smooth transition with base metal is achieved, defects are avoided, upper and lower welding guns are adopted for simultaneous welding, and deformation after welding is small.

The invention relates to the technical field of electrodes and preparation methods thereof, in particular to a carbon steel electrode for welding an SA516Gr.70 carbon steel plate, and a preparation method thereof. The carbon steel electrode comprises a core wire, an electrode coating and a binder. The material component of the electrode coating is powder, wherein the weight ratio of the powder tothe electrode is (35-45):100, the weight ratio of the powder to the binder is 100:(20-30), and the rest is the core wire. The components in the electrode coating comprise, by weight, 3-8% of rutile powder, 25-40% of marble powder, 15-30% of fluorite powder, 3-5% of electrolytic manganese, 2-8% of spray silicon iron, 0.2-1.0% of ferromolybdenum, 20-30% of reduced iron powder, 0.1-0.4% of graphite,0.2-0.8% of CMC and 0.3-1.0% of sodium carbonate. The carbon steel electrode has the advantages that electrical arc stability and molten bath liquidity are good, and molten slag shells evenly cover; deslagging is easy; and weld joints are formed flatly.