52results about How to "Reduce welding current" patented technology

The present invention relates to an arc welding method in which generation of spatters can be suppressed while the use quantity of gas to be supplied to a welding portion can be decreased. A welding wire 8 is brought into contact with a work W while applying a voltage between the welding wire 8 and the work W, so that the end of the welding wire 8 is caused to be fixingly welded to the work W. At this time, an electric resistance between the welding wire 8 and the work W is continuously obtained during the contact between the welding wire 8 and the work W, and thus, a minimum of the electric resistance is detected. When the current is temporarily reduced after the detection of the minimum of the electric resistance, the tip of the welding wire 8 hardly bursts, thus suppressing the expelling of molten particles, which may cause spatters, from the welding wire 8. The minimum value is also used for the torch-to-workpiece distance control.

The invention discloses a dedicated welding active agent for deep penetration TIG welding. The welding active agent is composed of, by mass, five percent to 15 percent of NaCl powder, 10 percent to 20 percent of CaO powder, 15 percent to 20 percent of MgF2 powder, 10 percent to 15 percent of Fe2O3 powder, seven percent to 10 percent of SiO2 powder, eight percent to 10 percent of TiO2 powder, 17 percent to 20 percent of Cr2O3 powder, four percent to five percent of La2O3 powder and four percent to five percent of Y2O3 powder. The using method of the active agent comprises the steps that calculation is carried out according to the mass percent, 92 percent to 95 percent of the powder of the dedicated welding active agent for deep penetration TIG welding is mixed with five percent to eight percent of acetone to form the pasty or grease-shaped welding active agent, the surface of a workpiece is evenly coated with the welding active agent through a brush, and welding is carried out after the acetone is fully volatilized. According to the welding active agent, complete penetration is achieved on AISI316 austenitic stainless steel and X70 pipeline steel with the thickness of 14 mm through deep penetration TIG welding, the welding process is simplified, a coarse structure is avoided, the mechanical property of a welding joint is improved, production efficiency is improved, and production cost is lowered.

A stainless heat-proof self-protecting flux-cored wire for a magnesium smelting reduction tank belongs to the technical field of materials processing engineering. A normal stainless steel band 304L or common carbon steel serves as a coating layer, and alloys in a powder core are rutile, sodium carbonate, feldspar, compound fluorides, chromium, nickel, manganese, molybdenum, chromium nitride, aluminium-magnesium alloy, misch metal and iron power. Compared with a conventional stainless steel welding rod, the stainless heat-proof self-protecting flux-cored wire has the advantages that higher welding current can be used; higher welding speed can be realized; the production efficiency is improved; and the labor intensity is lowered; c. Compared with a conventional stainless steel submerged-arc welding solid wire, the stainless heat-proof self-protecting flux-cored wire has the advantages that all-position welding can be realized; the heat input is small; the slag detachability is good; and the manufacturing technique is simpler. A welded joint formed by using the stainless heat-proof self-protecting flux-cored wire provided by the invention has favorable heat resistance, oxidation resistance, vulcanization and corrosion resistance and high-temperature creep resistance compared with welded joints formed by welding the stainless steel welding rod and the stainless steel solid wire.

The invention relates to an active agent applying to magnesium alloy welding, belonging to the material engineering technical field, which is characterized in that: the active agent is composed of TiO2, Cr2O3, MgO, MnO2, and CaO and the weight proportion is TiO2: 40 to 70%, Cr2O3: 5 to 20%, MgO: 2 to 20%, MnO2: 5 to 20%, CaO: 5 to 20%. Firstly, the active agent is grinded to powder, then is dried and cooled; secondly, the active agent is mixed with acetone or alcohol and then is equally coated or sprayed on the surface of the welding bead; finally, after the acetone or the alcohol is volatilized, welding can be implemented. The active agent has the advantages that: the weld penetration can increase at least twice; the weld joint of magnesium alloy is well moulded; the joint is of high quality and the intensity can be above the 95% of the intensity of the parent metal; the deformation due to welding is reduced; the invention is of easy operation and high productivity.

A resistance brazing method for galvanized steel sheets relates to the improvement of the resistance spot welding method for galvanized steel sheets. In the present invention, medium-temperature solder such as Zn-Al is placed on the two surfaces to be soldered. The solder can be sheet-like, foil-shaped, plated or sprayed on the surface to be soldered in advance, and the thickness of the solder is 0.05-0.5 mm. The electrode material can be an ordinary Cu-Cr-Zr electrode, and the electrode does not need special treatment. Set the resistance spot welding parameters, the welding current is 7000~14000A, the welding time is 10C~50C, the welding pressure is 0.7KN~5KN, start the resistance spot welding, and then let the weldment cool naturally. The invention can realize the connection without galvanized layer damage and copper pan under the premise that the galvanized steel sheet meets the strength, and improves the service life of the electrode.

The invention relates to a pipe pile seam welder, in particular to a rotating welding electrode structure of the pipe pile seam welder. The rotating welding electrode structure comprises support plates, a conducting electrode plate, a welding electrode plate and a spring locating assembly. A pendulum shaft is assembled between the two corresponding support plates, the conducting electrode plate and the welding electrode plate which are assembled together through a locating sleeve are installed on a reinforcing plate, the reinforcing plate is fixedly connected to the pendulum shaft, one end of the reinforcing plate is hinged to a spring locating rod in the spring locating assembly, and a balance body is assembled at the other end of the reinforcing plate. The rotating welding electrode structure has the advantages that by additionally installing the balance body on a welding electrode, the gravity of the balance body and centrifugal force generated when the balance body works on the welding electrode are utilized to balance or offset the gravity or centrifugal force of the welding electrode through the pendulum shaft, so that the welding electrode can provide almost balanced welding pressure within a whole circumference range, complete conditions are provided for reducing welding pressure or welding current at the time, and accordingly energy conservation and consumption reduction are achieved indeed.

The invention relates to a point welding technique of magnesium alloy filled with reactive powder, and belongs to the welding field of magnesium and the magnesium alloy material. The point welding technique of the magnesium alloy filled with the reactive powder is characterized in that the reactive powder is used as a filled layer to improve the contact resistance of magnesium alloy material which is difficult to weld in an early welding period. Resistance heat serves as a welding heat source, under the actions of protection of protective gas and resistance heat of added thermal compensation blocks, partial melting of surfaces to be welded of material happens simultaneously. Under the action of appropriate electrode pressure impact, oxidation films are crushed, refining action of the reactive powder medium is promoted on the interface of the material to be welded, nuggets are formed on the interface, so that the effect that nugget grains are refined under a relatively small current is achieved. Welding is achieved under thermal compensation, flexibility is relatively strong, and the point welding technology of the magnesium alloy filled with the reactive powder is of relatively ideal project significance.

The invention discloses a resistance spot welding electrode cap. A groove is formed in the center of a welding contact surface of the electrode cap; in the welding process, the contact area between the electrode cap and a to-be-welded metal workpiece is reduced due to the existence of the groove; in the initial stage, overall produced heat is concentrated to outer rings of welding spots, so that the heat dissipation speed is low, and formation of molten cores from outside to insideis facilitated; and due to the existence of the groove, the metal workpiece expands towards the sunk part of the center of an electrode, the molten cores of the welding spots areincreased, and splashing and deforming are reduced. Compared with a traditional electrode cap, the welding current needed for forming the welding spots inthe same size by the electrode capis lower, and the electric power cost is reduced; and when the same current is used, the strength and the stability of the obtained welding spots are higher, and the welding defects are fewer.

The invention provides a TIP TIG welding process of the duplex stainless steel. The TIP TIG welding process comprises the following steps of 1, preparation of welding material and formulation of welding process, 2, welding groove machining, 3, pre-welding preparation. 4, welding of duplex stainless steel, and 5, weld joint detection. According to the TIP TIG welding process , by means of the semi-automatic TIP TIG welding process, the problems that the existing duplex stainless steel manual GTAW welding speed is low, the welding efficiency is low, and the submerged-arc welding SAW welding position is limited are solved, the welding quality can be guaranteed, the welding efficiency can be improved, and semi-automatic full-position welding in the duplex stainless steel high-quality, high-efficiency, full-working-condition and full-thickness range is realized; the welding quality is ensured, the welding current is reduced, the welding heat input is reduced, the heat affected zone is reduced, the welding thermal deformation is low, the surface forming of the weld joint is good, and the operation controllability is high; and the welding efficiency is improved, and the full-position welding of the duplex stainless steel can be realized in a workshop or a field construction site.

The metal core welding wire for submerged arc welding of A304 and A304L austenitic stainless steel belongs to the field of welding material widely used in petroleum, chemical, ship-building and other fields. The present invention features that the metal core welding wire is formed through adding metal mixture powder in 40-58 wt% into low carbon steel belt material or super low carbon steel belt material, and the metal mixture powder consists of Cr 37-57 wt%, Ni 17-28 wt%, Mn 3-9 wt%, reduced Fe 7.5-30 wt%, Bi2O3 0.5-1.5 wt%, and Al-Mg alloy 2-10 wt%. The corresponding welding specification includes welding current of 380-600 A, welding voltage of 30-40 V and welding speed of 450-800 mm/min. The metal core welding wire has simple production process and excellent post-welding slag removing performance, and is especially suitable for high speed automatic welding.

The invention discloses a splashing-free resistance spot-welding method of galvanized steel plates for a car. The method is characterized by comprising the following steps that 1, a Cu middle layer isarranged between to-be-welded portions of the two galvanized steel plates to be welded, and the thickness of the Cu middle layer is 0.02-0.20 mm; 2, spot welding pre-pressing is carried out on the two galvanized steel plates to be welded, and pre-pressing time is 1000-2000 ms; and 3, spot welding is carried out on the to-be-welded portions of the two galvanized steel plates to be welded. According to the method, generation of splashing in the welding process can be prevented, strength of welding spots is improved, and the problem of spot welding of the galvanized steel plates is solved.

The invention discloses a lime kiln barrel assembling and welding method which comprises the following steps: firstly, measuring straightness of a first barrel, a second barrel to a nth barrel through a laser theodolite, and arranging dial indicators on the outer circumferences of the adjacent barrels respectively; secondly, welding a plurality of matched centering adjusting clamps on the inner circumference surfaces of the first barrel and the second barrel which are butted together so as to make the seam distances of the first barrel and the second barrel identical; thirdly, uniformly welding a plurality of tongue-shaped pressing plates on the inner circumference surfaces of the first barrel and the second barrel so as to correspondingly adjust the roundness of the first barrel and the second barrel; fourthly, welding welded blocks on the inner surfaces of the first barrel and the second barrel between two adjacent centering adjusting clamps; fifthly, welding in a CO2 protection semi-automatic welding mode, and welding the welding seams among the second barrel to the nth barrel in the same mode. By virtue of the effective welding method, welding operators are greatly reduced, the cost is saved, and the working efficiency is improved.

The invention discloses an active agent formula for 304 stainless steel A-TIG welding and a use method. The active agent formula is composed of the following components of, by mass percentage, SiO2 powder, Cr2O3 powder, Al2O3 powder, TiO2 powder, MnO2 powder, B2O3 powder and Fe2O3 powder. According to the formula, halide and other substances contained in an active agent in the prior art are abandoned, and harm to the human body is avoided; and the welding quality is good, the weld penetration is increased, the production cost is reduced, and the production efficiency can be greatly improved. The formula and the use method have the advantages that needed welding current can be effectively reduced by using the active agent for welding, energy consumption is reduced, meanwhile, heat input is reduced to a certain extent, and a thick structure is avoided; and the preparation method is simple, an active agent formula period is short, operation is easy, the production efficiency is improved, and the production cost is reduced.