Electric heating – Metal heating – By arc
Patent
1987-05-15
1989-06-06
Shaw, Clifford C.
Electric heating
Metal heating
By arc
219136, 2191372, B23K 900
Patent
active
048374202
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the process and method of conducting electricity in equipment and devices for arc welding, cutting or similar operations and also to an arc welding device to carry out the method. The particular object of the invention is a method of directing the electric current in this type of equipment to the arc electrode, hereafter generally referred to as the end part, or equipment, as the rotating drive shaft or sleeve, to which the end part is fixed.
Traditionally the electric current is conducted to the welding electrodes or drive shaft in the arc welding device by mechanical contact members to be pressed in contact with welding electrode or shaft and connected with electric conductors, such as spring loaded clamp cheeks or carbon brushes, which wear out in the use.
Underwater welding and arc cutting have been in the recent years an object of growing interest and development work. Repairs and servicing of drilling platforms, underwater gas and oil pipes, ships and docks are the processes in which underwater welding has mostly been used. The objects are in these cases generally such, that their lifting to the water surface is impossible or very costly. The objective of underwater welding, as well as in welding generally, is always the achievement of the highest quality welds. Then it is of vital importance that the conduction of electricity to the end part of the arc welding device to be targeted towards the worksite will be even and uninterrupted and that the changing of the end part electrode should be easy and swift even if the size is being changed.
Previously recognizable problems with welding and cutting methods and equipment particularly connected with the conduction of necessary electricity have been for instance the reliability of mechanical contacts. In addition to strength related failures, the contamination has produced contact disturbances resulting in welding faults or the welding or cutting process might completely be disrupted or interrupted. Another drawback is, that the adjustment possibility of contact members for end parts with different sizes and shapes is rather limited.
The objective of the present invention is to eliminate the above-mentioned drawbacks and limitations to arc welding processes and equipment already known in the art and to achieve a method for electrical conducting, to which the invention particularly is connected, which is more reliable and simple and guarantees the use of the welding device or more generally the arc welding device in all welding applications. It would also enable the use of the arc welding device in a more convenient and flexible way in the remote-controlled submarine use of robots, which significantly reduces both the costs and the risks connected to the underwater operations.
This objective has been achieved with the method and arc welding devices according to the invention the characteristic features of which are presented in the appended claims.
The primary feature of this invention is that no moving parts are necessary for the conducting of electricity and so the device according to the invention is very reliable, simple and easily adaptable to different objects of use, and that by using the solution of the invention the electric current can very easily be conducted also to rotating welding, cutting, cleaning and/or coating electrodes. This means that this method can successfully be utilized in all arc welding applications. An especially beneficial feature of the electrical conducting according to the invention is the production of an even magnetic field which, particularly in welding applications, results in an even arc.
The method and arc welding device according to the invention are described in the following by some preferable applications with reference to the accompanying drawings, in which
FIG. 1 shows a cross section of a continuous feeding welding equipment,
FIG. 2 shows a cross section of an arc welding device with a rotatable drive shaft to be provided with an end part for welding, cutting, cleaning and/or electroly
REFERENCES:
patent: 1433331 (1922-10-01), Angstrom
patent: 3125649 (1964-03-01), Cyr
patent: 3211883 (1965-10-01), Zimmermann
patent: 3230343 (1966-01-01), Nagy
patent: 3553423 (1971-01-01), Doxey
patent: 4056703 (1977-11-01), Mandoki
Oy GSS General Sea Safety Ltd.
Shaw Clifford C.
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