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.

The invention discloses a flux-cored wire for austenitic stainless steel welding. The flux-cored wire consists of a flux core and an external steel belt; the external steel belt is an austenitic stainless steel belt of which the carbon content is less than 0.025 percent; the carbon content of the flux core is not greater than 0.04 percent and carbon accounts for 18.0 to 24.0 percent based on the total weight of the flux-cored wire; the flux core comprises the following components in percentage by weight: 18.5 to 25.0 percent of metal chromium powder, 8.0 to 10.0 percent of metal nickel powder, 2.0 to 5.0 percent of electrolytic manganese metal, 1.0 to 3.0 percent of aluminum magnesium alloy, 28.0 to 35.0 percent of rutile, 3.0 to 5.0 percent of quartz, 2.0 to 5.0 percent of zircon sand, 2.0 to 5.0 percent of feldspar, 1.0 to 2.0 percent of cryolite, 2.0 to 5.0 percent of arc stabilizer and the balance of iron powder; and the arc stabilizer consists of K2O, Na2O and TiO2 in a weight ratio of (6.0-8.0):(8.0-10.0):(68.0-70.0), and the water content is not greater than 400 ppm.

The invention discloses a laser-CMT welding aluminum alloy additive manufacturing method and a forming system. A laser and an electric arc are adopted as a composite heat source, the cold metal short circuiting transfer manner is adopted, and additive manufacturing forming for an aluminum alloy component is achieved. According to the provided laser-CMT welding additive manufacturing method, the problems that in the process of aluminum alloy component manufacturing through laser additive, the required laser power is high, and forming is difficult are solved, the problems that in the traditional process of aluminum alloy manufacturing through electric arc additive, the heat input amount is large, deformation is serious, and a molten bath is prone to overflowing or webbing are solved, and the problem that in the process of aluminum alloy manufacturing through CMT welding additive, incomplete fusion or slag inclusion or the like is likely to happen is solved; and the additive manufacturing method based on the laser-electric arc composite heat source principle is provided for additive manufacturing forming for the aluminum alloy component.

A gas-shielded flux-cored wire with recyclable welding slag belongs to the welding field. In the invention, the skin of the gas-shielded flux-cored wire is made from a mild steel strip, and welding slag powder is partially or completely instead of natural rutile, thus the purposes of saving the resource and reducing the cost are achieved. The powder of the flux-cored wire comprises the following chemical components in percentage by weight: 15-35% of the welding slag powder of the flux-cored wire (including 20-65% of TiO2, 5-15% of MnO, 5-15% of MgO, 5-15% of SiO2, 1-10% of Fe2O3 and 1-10% of Al2O3), 15-35% of TiO2, 2-7% of Si, 3-8% of Mn, 0.5-5% of Al-Mg, 0-5% of Na, 0-5% of K, 1-5% of Mg and the balance of ferrous powder. When the flux-cored wire manufactured by adopting the welding slag powder is applied to welding, the gas-shielded flux-cored wire has the advantages of excellent technical performance of welding and omnibearing welding adaptability, attractive appearance good humidity resistance, low content of diffusible hydrogen in a welding seam, excellent crack resistance, high connection strength and good low-temperature impact toughness.

The invention discloses a flux cored wire for heat resistant steel. Flux cored powder of the flux cored wire is formed by mixing the following components by weight percentage: 21 to 23 percent of rutile, 1.5 to 2.5 percent of aedelforsite, 19 to 21 percent of silicon-manganese alloy, 8.5 to 10.5 percent of ferrous powder, 1.5 to 2.5 percent of nickel powder, 2.5 to 3.5 percent of cryolite, 7 to 9 percent of feldspar, 13 to 14 percent of ferrochrome, 6 to 7 percent of ferromolybdenum, 6 to 7 percent of mid-carbon ferromanganese, 2.5 to 4.5 percent of magnesite, 6 to 7.5 percent of quartz, 0.5 to 2 percent of fluorite, 1.5 to 3 percent of aluminum-magnesium alloy and 0.5 to 2 percent of ferrotitanium. During the welding, the flux cored wire not only uses CO2 to protect shielded welding, but also has the advantages of small splash, easy slag removal, stable electric arc burning, and spray transfer as a droplet transfer form.

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.

The invention relates to a full-digital PWM-controlled AC pulse MIG welding system, which belongs to the field of welding equipment and automation. The full-digital PWM-controlled AC pulse MIG welding system comprises a main circuit and a control circuit, wherein the control circuit comprises a kernel control section, a control execution section, etc. The kernel control section comprises a DSP system, a current sampling and filtering circuit, a voltage sampling and filtering circuit, a CPLD system and a protection circuit. The DSP system is respectively connected with the CPLD system, a welding parameter setting signal and a welding parameter display signal in a front panel input and display section, a welding torch switch signal in a wire feeding system, a valve switch quantity signal and a wire feeding setting signal, and the CPLD system is also connected with the protection circuit and a primary inversion drive circuit in the control execution section. By combining the DSP system and the CPLD system, the welding system can achieve full-numerical control, which has flexible control and accurate control in comparison with the analog control manner of D / A+SG3526.

A weld stability system for an arc welding apparatus and method of operation is disclosed. The weld stability system may comprise a shielding gas supply and a control assembly. The shielding gas supply may include a first source of gas, a second source of gas, a mixing chamber, a first valve selectively connecting the first source of gas to the mixing chamber, a second valve selectively connecting the second source of gas to the mixing chamber, and a shielding gas supply line configured to direct gas from the mixing chamber to a weld gun. The control assembly may include a controller operatively engaging the first and second valves, and at least one sensor configured to monitor a parameter of an arc welding process and communicate with the controller.

The invention discloses a high-tenacity low-hydrogen alkaline welding rod which comprises a coating and a welding core, wherein the coating comprises, by weight, 38%-44% of marble, 20%-25% of fluorite, 3%-5% of zircon sand, 1%-5% of ferrosilicon, 10%-15% of ferrotitanium, 5%-7% of mid-carbon ferromanganese, 2%-4% of titanium dioxide, 3%-6% of mica, 1.5%-2% of microcrystalline fiber, 1.2%-1.8% of nickel powder, and 1%-1.5% of misch metal, wherein sum of weight percentages of all components is 100%. The invention further discloses a preparation method of the high-tenacity low-hydrogen alkaline welding rod. The preparation method of the high-tenacity low-hydrogen alkaline welding rod includes the steps: enabling coating materials and K-Na mixing water glass to be mixed, crushing the mixture into a power ball with a cylindrical shape, putting the power ball into a pressing coating machine, coating the power ball with the cylindrical shape on a H08A welding core to form the welding rod, and then grinding the head and the tail and getting the high-tenacity low-hydrogen alkaline welding rod after drying. When the high-tenacity low-hydrogen alkaline welding rod is used for welding high-strength steel, no preheating is needed before welding, no heat treatment is needed after welding, content of diffusible hydrogen of deposited metal is controlled effectively, and the preparation method is simple.

The invention discloses a micro-plasma arc welding method for dissimilar metals of a heat-resistant casting alloy and austenitic steel, which realizes rapid welding of the heat-resistant casting alloy and the austenitic steel by adopting micro-plasma arc welding technology and proper process equipment, and strictly controlling welding process parameters, and is particularly suitable for the places where the thickness difference between the heat-resistant casting alloy and the stainless steel is great. Due to the micro-plasma arc welding method for the heat-resistant casting alloy and the austenitic stainless steel, the application range of heterogeneous structural parts of the heat-resistant casting alloy and the austenitic stainless steel is enlarged, and the micro-plasma arc welding method has the advantages of effectively improving the welding production efficiency, along with stable and reliable welding quality. Compared with the argon tungsten-arc process, the production efficiency of the micro-plasma arc welding is improved by more than 2 times.