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2. Gas metal arc welding - Wikipedia

   en.wikipedia.org/wiki/Gas_metal_arc_welding

   Spray transfer GMAW. Gas metal arc welding (GMAW), sometimes referred to by its subtypes metal inert gas (MIG) and metal active gas (MAG) is a welding process in which an electric arc forms between a consumable MIG wire electrode and the workpiece metal(s), which heats the workpiece metal(s), causing them to fuse (melt and join).

3. Welding power supply - Wikipedia

   en.wikipedia.org/wiki/Welding_power_supply

   A transformer-style welding power supply converts the moderate voltage and moderate current electricity from the utility mains (typically 230 or 115 VAC) into a high current and low voltage supply, typically between 17 and 45 (open-circuit) volts and 55 to 590 amperes.

4. Hyperbaric welding - Wikipedia

   en.wikipedia.org/wiki/Hyperbaric_welding

   Dry hyperbaric welding involves the weld being performed at raised pressure in a chamber filled with a gas mixture sealed around the structure being welded.. Most arc welding processes such as shielded metal arc welding (SMAW), flux-cored arc welding (FCAW), gas tungsten arc welding (GTAW), gas metal arc welding (GMAW), plasma arc welding (PAW) could be operated at hyperbaric pressures, but ...

5. Electron-beam welding - Wikipedia

   en.wikipedia.org/wiki/Electron-beam_welding

   As a source of electrons for electron-beam welders, the material must fulfill certain requirements: To achieve high power density, the emission current density [A/mm 2], hence the working temperature, should be as high as possible, To keep evaporation in vacuum low, the material must have a low enough vapour pressure at the working temperature.

6. Mikoyan-Gurevich MiG-1 - Wikipedia

   en.wikipedia.org/wiki/Mikoyan-Gurevich_MiG-1

   These included an additional air intake on the starboard side of the nose for the oil cooler, rubber sheaths around the fuel tanks to make them self-sealing, two underwing bomb racks each capable of carrying a 100-kilogram (220 lb) FAB-100 bomb, a PBP-1 gunsight and each ShKAS was given 375 rounds and the UBS 300 rounds. From the ninth aircraft ...

7. List of Mikoyan-Gurevich MiG-21 operators - Wikipedia

   en.wikipedia.org/wiki/List_of_Mikoyan-Gurevich...

   MiG 21 Type 77 of the Indian Air Force landing.. Indian Air Force: 54 in service as of 2023.India received its first MiG-21s in 1963, numbering 8 MiG-21F-13s. Two more F-13s and two MiG-21PF were received in 1964, called the Type 74 [14] [15] and the Type 76 [15] respectively in the IAF.