45 results about "Electrogas welding" patented technology

A welding device (1) for joining components by means of resistance welding is proposed, comprising: - a pair of electrodes (15), by means of which an electrode force (21) and an electrical welding current IS1 can be introduced into the components, - at least one further pair of electrodes (17), by means of which an electrode force (23) and a further electrical welding current IS2 can be introduced into the components, - a power source (19), by means of which the electrode forces (21, 23) can be generated, - a coupling link (35), which is mechanically connected between the power source (19) and the pairs of electrodes (15, 17) and by means of which a total electrode force (27) that can be generated by the power source (19) can be divided into the electrode force (21) and the further electrode force (23).

The invention discloses an electrogas welding arc length controller based on FPGA (Field Programmable Gate Array), comprising three trolley walking given circuits, a motor voltage negative feedback and current positive feedback circuit, an isolation optocoupler circuit, an AD conversion circuit, a positive and negative welding gun retaining and given circuit, a welding control signal circuit, an FPGA control circuit, a direct current motor driving circuit and a welding gun swinging control circuit. The invention has the advantages of wire feeding with equal speed and climbing of the trolley with variable speed, and can better control the stability of arc during welding.

Superalloy component castings, such as turbine blades and vanes, are fabricated or repaired by an electroslag or electrogas welding process that at least partially replicates the crystal structure of the original cast substrate in a cast-in-place substrate extension. The process re-melts the base substrate surface and grows it with new molten filler material. As the base substrate and the filler material solidify, the newly formed “re-cast” component has a directionally solidified uniaxial substrate extension portion that at least in part replicates the crystalline structure of the base substrate. The “re-cast” component can be fabricated with a unified single crystal structure, including the extension portion. In other applications, a substrate extension can replicate a directionally solidified uniaxial crystal structure of an original base substrate casting. Polycrystalline substrate base structures can be re-cast with a substrate extension that replicates base substrate crystals that are most parallel to the uniaxial casting direction.

The invention relates to a foundation treatment method adopted when an old residual pile foundation exists during building construction. The method comprises the steps that 1, a newly-built foundation bottom face is adopted as a base, and overexcavation is carried out towards the lower portion and the two sides; 2, the old pile foundation exposed after overexcavation is chiseled away through a concrete chiseling machine, and exposed steel bars in an old pile are cut away through electrical welding; 3, after the ground obtained after overexcavation is leveled, gravel refilling is carried out, graded gravel with the maximum particle size of 50 mm is adopted for refilling, refilling gravel layers are ground by a vibrating roller layer by layer, the thickness of each layer is 200-300 mm, and the degree of compaction of the refilling gravel layers is not smaller than 0.97; 4, foundation pad layers are laid on the refilling gravel layers, and the strength grade of concrete is not lower than C10; and 5, newly-built foundation construction is carried out above the foundation pad layers. Under the condition of meeting foundation bearing capacity, the functions of adjusting the foundation bearing state and preventing differential settlement through an artificial mattress formed by the refilling gravel layers are achieved; and by means of the structure, construction difficulty can be greatly lowered, the construction progress can be accelerated, and a large amount of project investment can be saved.

The invention discloses a flux-cored wire for electrogas welding, which comprises a steel strip and welding flux wrapped in the steel strip. The weight coefficient of the welding flux in the overall weight of the wire ranges from 0.2 to 0.3. By weight percentage, the steel strip comprises 0.010-0.055% of C (carbon), 0.01-0.03% of Si (silicon), 0.10-0.30% of Mn (manganese), 0.005-0.060% of Al (aluminum), 0.007-0.012% of P (phosphorus), 0.007-0.012% of S (sulfur) and the balance Fe (ferrum). By the overall weight of the wire, the welding flux comprises 0.2-2.0% of fluoride, 0.2-1.0% of oxide, 1.0-3.0% of Mn, 0.2-1.0% of Si, 0.4-1.2% of Ni (nickel), 0.1-1.0% of Mg (magnesium), 0.002-0.16% of Ti (titanium), 0.002-0.010% of B (boron) and the balance Fe. The flux-cored wire matched with electrogas welding is used for welding, so that welding efficiency is greatly improved, and excellent and stable mechanical performance is also obtained.