Abstract: A process and an apparatus for producing a welded can body having an organic coated welded part are provided in which the exposed metal portion on the inside of the welded part of the can body and its vicinity is covered with a tape of an organic resin alone or a mixture of an organic resin with an inorganic material such as a pigment, a metal, etc. The resin tape is entirely supported by a mandrel to be disposed inside the can body, and pressed against the inside surface of the welded part and its vicinity. By heating the welded part of the can body, the resin tape is heated during pressing.

Abstract: There is provided a method of making a welded can body having a mash seam weld which includes a heat affected zone extending continuously in the longitudinal direction thereof and is formed with no pitting. The weld is formed by mash seam welding a lapped portion of a can body preform made of a surface treated steel sheet while allowing an alternating current to flow through the lapped portion via a water-cooled elongated electrode and a water-cooled rotary electrode. The alternating current has a crest factor satisfying an expression 1.5.ltoreq.Ip/Ie.ltoreq.2.0, where Ie and Ip designate an effective value and a peak value, respectively, of the alternating current.

Abstract: A device for feeding electric power to a roll-like revolving electrode in an electrical resistance welding machine includes a feeder rotor provided in a shaft formed integrally with a revolving electrode and a feeder plate extending in the moving direction of the revolving electrode and disposed in contact with the periphery of the feeder rotor. The periphery of the feeder rotor is electrically coupled to the electrode surface of the revolving electrode, and the feeder plate is connected to a power supply. Consequently, the electrode surface of the revolving electrode is electrically coupled to the power supply.

Abstract: An improved apparatus for producing welded metallic can bodies is provided. The apparatus has two roll-like revolving electrodes and an elongate electrode, and the lap portions of two can bodies are disposed respectively between the two revolving electrodes and the elongate electrode. An alternating current flowing through these lap portions is supplied by coupling the two revolving electrodes to an ac power supply, or by dividing the elongate electrode into two electrically insulated portions and coupling these portions to the power supply.

Abstract: A tinfree steel welded can body formed by a mash resistance welding on a lapped side portion of a can body preform made from tinfree steel, without requiring the removal of surface chromium film from the welded portion and its vicinity.

Abstract: Disclosed are a method of and apparatus for making a welded metallic can body by effecting a mash resistance welding on a lapped side portion of a can body preform by means of a combination of a cooled elongated electrode and a cooled rotary electrode and, as required, with wire electrodes interposed between the lapped side portion and these electrodes. Also, disclosed are a tinfree steel welded can body and its making method wherein it is formed by a mash resistance welding on a lapped side portion of a can body preform made from tinfree steel, without requiring the removal of surface chromium film from the welded portion and its vicinity.

Abstract: A method of preparing hollow metallic bodies by contacting flat droplets of a molten metal with a liquid capable of readily gasifying at a temperature lower than the melting point of said metal. Upon contact the liquid gasifies under the flat droplets and the gas pushes up the center of the flat droplets. The edges of the droplets fall because the vapor near the edges goes around the edges. As the middle of the droplets rises the surface tension of the droplets brings the edges together thereby forming the hollow metallic body.

Abstract: Disclosed are a method of and apparatus for making a welded metallic can body by effecting a mash resistance welding on a lapped side portion of a can body preform by means of a combination of a cooled elongated electrode and a cooled rotary electrode and, as required, with wire electrodes interposed between the lapped side portion and these electrodes. Also, disclosed are a tinfree steel welded can body and its making method wherein it is formed by a mash resistance welding on a lapped side portion of a can body preform made from tinfree steel, without requiring the removal of surface chromium film from the welded portion and its vicinity.