279results about How to "Improved arc stability" patented technology

An electrode to form a hardfacing alloy for use as a surfacing on metal that is subjected to high thermal and mechanical stresses. The electrode includes chromium, a metal sensitization inhibitor, and iron to form a hardfacing alloy.

Disclosed is a low alloy steel drug core welding wire used in the carbon dioxide arc welding. The components of the drug core and the content occupying the total weight of the welding wire(percent ratio) are as following: Ti01 3-6, Si 0.3-0.5, Mn 1.5-3.2, Si02 0.1-0.8,Zr02 0.1-0.5, Fe 2-7, Al plus Mg 0.5-1.2, Ni 0.5 -5, B 0.002-0.015, Ti 0.1-0.3; oxide or fluoride of alkali metal K, Na and Li is converted into the content of K, Na and Li, that is, 0.1-0.35; the content of fluoride F is 0.05-0.2; fluoride or oxide of rare earth metal is converted into the content of the rare earth metal, that is, 0.005-0.2; the product of the contents of C, Si and Mn in the welding wire is 0.058-0.11. The invention has good process property for the whole position welding of high strength low alloy steel, and can keep good stability of electric arc and welding operating property in the conditions of large current and fast-speed welding with smooth welding seam, high connecting intensity, good impact toughness minus 40 DEG C low temperature and good crack resistance.

If a short circuit does not occur during deceleration of a wire feed speed in forward feed of a welding wire before the wire feed speed reaches a predetermined wire feed speed, a cyclic change is stopped and the wire feed speed is constantly controlled at the first feed speed. If a short circuit occurs during forward feed at the first feed speed, deceleration from the first feed speed starts, and the cyclic change is resumed for welding. This achieves uniform weld bead without increasing spatters even if any external disturbance such as change of distance between a tip and base material occurs.

A process for treating a metal sulphide concentrate which includes the steps of: a) roasting the concentrate to reduce the sulphide content of the concentrate, to a negligible value and b) melting the concentrate, under reducing conditions, in an electrically stabilized open-arc furnace, in particular a DC arc furnace.

An impulse arc welding control method comprises: repeating electrifying using the electrifying of peak current of in peak period and the electrifying of background current in background period as impulse period; controlling the arc length in the manner that the welding voltage value (Vw) is approximately equal to the set voltage value (Vs); making the arc length to vary periodically by making the set voltage value (Vs) to vary synchronistically with the switching signal (Stc); making the impulse parameter (Ps) to vary synchronistically with the switching signal (Stc); and changing the sending speed (Fs) from the time the switching signal (Stc) varying starts to the time arc length (La) transition varying approximately converges. Thus, the major varying of arc force make the shake movement of the bath becomes more intensive to improve the air bubble reducing effect. Consequently, the air bubble reducing effect is improved in the impulse arc welding method with arc length varied periodically.

Mercury-free metal halide lamp with a warm white luminous color, the fill of which comprises the following components: an inert gas which acts as a buffer gas; a first group of metal halides (MH), the boiling point of which is above 1000° C. (preferably above 1150° C.), the first group comprising at least Dy and Ca used simultaneously as metals, and the molar ratio of the two metal halides Ca-MH:Dy-MH being between 0.1 and 10; these are components with a low volatility which are present in saturated form; a second group of metal halides, the boiling point of which is below 1000° C. (preferably below 900° C.), the second group comprising at least one of the elements In, Zn, Hf, Zr as metals; these are volatile components which are mostly present in unsaturated form; the total fill quantity of the first group of metal halides being between 5 and 100 mumol/cm3; the total fill quantity of the second group of metal halides being between 1 and 50 mumol/cm3; and the color temperature being between 2700 and 3500 K; the general color rendering index being at least Ra=90, while at the same time the red rendering index is at least R9=60.

An aluminum metal-core weld wire, the sheath being aluminum, the metal-core having a composition that contains primarily metallic alloying powders e.g. Manganese nitride and/or barium. A method for manufacturing aluminum metal-core wire, the method including depositing a core composition onto strip of aluminum, forming strip of aluminum into a tube containing core composition, and applying an inorganic lube to surface of tube, and drawing tube through reducing dies.

The invention discloses a low-temperature steel flux cored wire. Flux core of the flux cored wire comprises the following raw materials by weight percentage: 28 to 33 percent of rutile, 1 to 3 percent of aedelforsite, 14 to 18 percent of silicon-manganese alloy, 16 to 21 percent of ferrous powder, 2 to 4 percent of nickel powder, 1 to 2 percent of cryolite, 5 to 7 percent of feldspar, 1.5 to 2.5 percent of ferrotitanium, 0.5 to 1 percent of ferroboron, 5 to 6 percent of mid-carbon ferromanganese, 2.5 to 4 percent of magnesite, 4 to 6 percent of quartz and 1.5 to 3.5 percent of fluorite. Compared with the similar product of the prior art, the flux cored wire belongs to the meta-acid slag series, and has the advantages of good electric arc stability, less splash, easy slag removal, good low-temperature impact ductility, good low-temperature crack resisting performance, high efficiency and low cost.

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.

Disclosed here is a pulse welding control method and a pulse arc welding device capable of improving arc stability, and decreasing the amount of spatters. The structure contains arc short-circuit judging section (13) for judging a welding state; setting section (21) for defining parameters used for a short-circuit period and an arc period; secondary control section (25); and driving section (18). Secondary control section (25) sharply decreases welding current on detecting a moment when the tip of a wire has a neck just before recovery from the short circuit, according to at least any one of outputs from a welding current value detector, a welding voltage value detector, and the setting section. Driving section (18) selects from outputs of a pulse-waveform circuit section and a dip-waveform circuit section according to the signal from the setting section and the output from the arc short-circuit section, and outputs the selected data to a switching element.

The invention discloses an X80-level straight seam submerged-arc welded pipe with hydrogen sulfide stress corrosion resistance as well as a manufacturing method thereof. The straight seam submerged-arc welded pipe comprises a welding seam and a welded pipe body, and is characterized in that the welded pipe body consists of the following elements in percent by mass: not greater than 0.04% of C, 0.20%-0.40% of Si, 1.20%-1.80% of Mn, not greater than 0.008% of P, not greater than 0.002% of S, 0.10%-0.30% of Ni, not greater than 0.15% of Cr, not greater than 0.15% of Cu, 0.01%-0.10% of Nb, 0.01%-0.10% of Ti, 0.10%-0.30% of Mo, 0.04%-0.10% of Al, not greater than 0.0005% of B, not greater than 0.002% of Ca, and the balance of Fe and inevitable impurities. According to the X80-level straight seam submerged-arc welded pipe and the manufacturing method thereof disclosed by the invention, the X80 straight seam submerged-arc welded pipe disclosed by the invention has good strength, toughness, welding performance, ductility and corrosion resistance through reasonably deploying and controlling material components, a manufacturing process, a manufacturing technology and subsequent processing. Besides, high-pressure large-flow conveying requirements of oil gas under an acidic environment are satisfied.

The invention is an embedded digital control inverter power source used in tube and plate overall position automatic welding, which comprises a main circuit, a control circuit and a high frequency arc-ignition circuit. The main circuit comprises a rectifying wave filter module, a high frequency inverter module, a power voltage-transforming module and a rectifying smooth module which are connected sequentially. The rectifying wave filter module is connected with a three-phase alternating current (AC) input power, and the rectifying smooth module is connected with a load. The control circuit includes an over-voltage and under-voltage protective testing module, a voltage and current sample testing and feedback module, an ARM microprocessor and a high frequency drive module. The over-voltage and under-voltage protective testing module is respectively connected with the three-phase AC input power and the ARM microprocessor. The voltage and current sample testing and feedback module is respectively connected with the ARM microprocessor and the load. The ARM microprocessor is also connected with the high frequency drive module and the high frequency arc-ignition circuit. The high frequency drive module is also connected with the high frequency inverter module, and the high frequency arc-ignition circuit is also connected with the load. The invention can realize the overall digital control of the tube and plate automatic welding inverter power source.

The invention discloses a high-hardness flux-cored welding wire for overlaying repair of a continuous casting roller, and belongs to the technical field of welding in material processing engineering. An H08A cold-rolled steel strip is adopted as an outer cover, a flux core comprises the following components in percentage by weight: 20-40% of TiO2, 5-15% of high-carbon ferrochrome, 12-30% of low-carbon ferrochrome, 0.5-5% of Mn-Si alloy, 0.5-5% of Al-Mg alloy, 5-15% of Ni, 0.5-2.5% of fluoride, 5-15% of Mo, 0.5-2.5% of V, 2-10% of Cr, 0.5-5% of Al2O3 and the balance of iron powder. The filling rate of the traditional Chinese medicine core of the flux-cored welding wire is 20-35%. The welding wire has the advantages that the flux-cored welding wire adopts a self-protecting overlaying manner, and shielding gas and welding flux are not needed in the overlaying repair process of the continuous casting roller, so that the repair cost can be greatly reduced, the manual labor intensity is lowered, and the production efficiency is improved; the welding wire has good arc stability, excellent abrasion-proof property and excellent thermal fatigue resistant property, and the service life of the continuous casting roller is effectively prolonged.

The invention provides an ultrasonic-frequency composite pulse GMAW welding power source device which comprises a constant-voltage source used for providing constant voltage for a BUCK type main circuit, the BUCK type main circuit, a constant-current source used for providing constant current for an ultrasonic-frequency pulse current switching circuit, and an ultrasonic-frequency pulse current switching circuit. The constant-voltage source is connected with the BUCK type main circuit. The constant-current source is connected with the ultrasonic-frequency pulse current switching circuit. The BUCK type main circuit is connected with the ultrasonic-frequency pulse current switching circuit in parallel. The BUCK type main circuit is used for providing first output current for welding, wherein the first output current is in a direct current form or a pulse form. The ultrasonic-frequency pulse current switching circuit is used for providing second output current for welding, wherein the second output current is ultrasonic-frequency pulse current. By means of the above ultrasonic-frequency composite pulse GMAW welding power source device, the ultrasonic-frequency pulse current and the current in the direct current form or the pulse form are superimposed, the behavior of metal transfer of traditional direct current or pulse GMAW is improved, electric arc energy is concentrated, the electric arc stability is greatly improved, and the influences of electric arc magnetic flow are reduced.

The invention relates to a welding process of ultrahigh-strength steel and heterogeneous high-strength steel, belonging to the field of welding and processing. For solving problems, the invention provides a welding process of ultrahigh-strength steel and heterogeneous high-strength steel to ensure that welded joints have favorable formation and no welding defects and the mechanical properties can meet the requirement on the product. The welding process comprises the following steps of: (1) groove form: setting the groove angle on the end surface of the ultrahigh-strength steel to 37 DEG-45 DEG, setting the end face of a heterogeneous high-strength steel forging to a vertical plane, and adopting appropriate root gaps and truncated edges; (2) selection of a welding method and a welding material: bottoming by adopting melting pole mixed gas metal arc welding (GMAW) with a Lincoln STT (Short Time Test) technology, wherein the welding requires single-face welding and double-face formation, welding wires adopt AWSA5.28ER80S-G, the protective gas is formed by mixing 80% of AR and 20% of CO2, and the gas flow is15-20 L/Min; and the filling and the cover face, wherein low-hydrogen shielded metal arc welding (SMAW) is adopted, and AWSA5.5E11018M is selected as a welding rod. The welding process is used for welding and processing the ultrahigh-strength steel and the heterogeneous high-strength steel.

A gas shielded flux-cored wire (FCW) comprises s steel sheath and core flux, in which recycled welding slag powder is used to partially replace the natural rutile. The core flux contains (by weight): 10-50% recycling welding slag powder, 10-45% TiO₂, 2-7% Si, 5-20% Mn, 0.5-5% Al—Mg (Al/Mg=1), 0-11.52% Na₂CO₃, 0-8.85% K₂CO₃, 0-10% MgO, 0.5-10% fluoride, and iron powder as balance. The recycling welding contains (by weight): TiO₂: 20-65%, MnO: 5%-15%, MgO: 5%-15%, SiO₂: 5%-15%, Fe₂O₃: 1%-10%, Al₂O₃: 1%-10%.

The invention discloses a gas protection solid welding wire for 1000 MPa high-strength steel welding and preparing and welding methods of the gas protection solid welding wire. Chemical ingredients of the welding wire include, by weight, 0.07-0.13 part of C, 0.3-0.5 part of Si, 1.8-2.3 parts of Mn, 2.7-3.2 parts of Ni, 0.3-1.2 parts of Cr, 0.4-0.85 part of Mo, 0.01-0.1 part of Ti, 0.01-0.03 part of Al, 0.008 part or below of P, 0.005-0.010 part of S, 0.3 part or below of Cu, 0.01-0.035 part of Nb and the balance Fe. The welding wire can replace an imported welding wire, the construction cost of high-strength steel for large hydropower stations, water pumping and energy storage power stations and the like can be remarkably reduced, and remarkable economic benefits and social benefits are achieved.

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 belongs to the technical field of material processing, which relates to a laser-electric arc composite welding method. The method comprises the following steps: installing an extra electrode in the position with the distance of 4 to 100 mm higher from the surface of a work piece to be welded in the direction vertical to the laser beam; forming a hole in the center of the extra electrode for passing the laser beam; and respectively connecting the extra electrode and the work piece to be welded to both ends of a DC stabilized voltage supply with the output voltage between 1 and 220 V at the electric field intensity between 1 and 220 V/cm. When the laser power is between 300 W and 500 W, the electric arc current is between 100 A and 300 A, and the electric arc current is between 20 V and 35 V, the optimum range of the extra electric field intensity is between 30 V/cm and 60 V/cm. The invention can fully utilize the energy of the laser and the electric arc, and can realize the effect of obtaining large composite hot source welding fusion depth under the condition of lower laser output power. Compared with the existing laser-electric arc composite welding method under the same process condition, the invention has the advantage that the fusion depth is increased by 15 percent to 40 percent.