Abstract: Apparatus for underwater working, especially for heating, welding, torch cutting, cleaning and electrolytical coating of metal constructions with the aid of electrical current. The apparatus comprises a rotatable electrically conductive shaft (2) arranged on the frame element (1) of the apparatus and designed to conduct electrical current to the removable tip element (3) attached to the end of shaft, this tip element being such as heating bush, welding electrode, cutting, cleaning and/or coating disk.

Abstract: A method of conducting electricity in an arc welding device especially to an arc electrode (1), such as a welding, cutting, cleaning or electrolyte coating electrode, or to a device supporting such electrode, as well as an arc welding device to realize the method. The electrode (1) or the device supporting it is brought to a direct contact before the arc area with a flowing, preferably liquid, medium in contact with the power supply. The device for conducting electric current comprises a chamber (2) adapted inside the casing (6) and including flowing, preferably liquid, medium, which is in electrically conductive contact to the power supply and the electrode (1) or the device supporting it.

Abstract: A pastelike additive used in the underwater arc welding to protect the weld and/or welding rod against the harmful effects of water. The additive contains the base material advantageously mixed with oily carrier liquid and comprising at least 10 percentages of weight one base material, advantageously a biomass with plenty of organic compounds, and possibly termitic agent, regulating agent for the pH-value of the additive, lighting agent, hydrogen removal agent and an agent to enhance the sufficiency. The additive according to the invention is characterized in that the ashless dry material of the biomass in the base material contains: 1 . . . 40, advantageously 10 . . . 13, percentages of weight amino acids; 0,5 . . . 10, advantageously 1,5 . . . 2,5, percentages of weight fatty acids; 50 . . . 98, advantageously 83 . . . 87, percentages of weight carbohydrates, preferably carbon compounds with large molecular sizes; and about 0,5 percentages of weight mineral substances and/or trace elements.

Abstract: An attachment device adapted to be fused to an underwater object which includes a housing having a fuel chamber in generally surrounding relationship to an ignition chamber, a closure normally closed in communication between the chambers, an ignition device which opens the closure and ignites the fuel in the fuel chamber creating a high temperature flame which is directed toward an end of the attachment device resting against an underwater object, the end having a fusion groove for directing the flame against a localized area of the underwater object to render the metal thereof molten, and also having one or more passages for redirecting the molten material back toward the attachment device such that upon solidification, one or more discrete rigidifying bridges of molten metal are formed, and a groove defined by a pair of lips is also positioned adjacent the end for further directing the high temperature medium to achieve effective fusion.