Method and an apparatus for automatic electric welding
AssigneeAkademiet for de Tekniske Videnskaber, Svejsecentralen
InventorsSvend A. Lund, Erik Kongshavn, Erik Ostgaard
Life of this patent
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Abstract
When carrying out electric fusion welding with at least two current-carrying electrodes, these electrodes are held in a joint holder in non-parallel positions so that they meet in a point of intersection in which melting of the electrode material takes place. Hereby the risk of burn-through is minimized and an additional degree of freedom which can be used for controlling purposes is obtained.
Claims12
In a method for automatic electric fusion welding of a current-carrying workpiece wherein at least two current-carrying welding electrodes are used simultaneously, the electrodes being mounted in a joint holder which is movable in relation to the workpiece, and wherein at least one of the electrodes is a continuously melting electrode movable in relation to the joint holder by means of a feeding device, the improvement comprising:
- (a) mounting and feeding said electrodes at a relative angle of between 0.degree. and 180.degree. in such a manner that the protruding ends of said electrodes are at least randomly in physical contact at a point of intersection where the melting of electrode material occurs, said point of intersection being substantially fixed in relation to said joint holder, whereby the physical contact at the point of intersection of the protruding ends of said electrodes is automatically and continuously reestablished by the mounting and feeding of said electrodes;
- and
- (b) applying an electric potential between each of said electrodes and said work piece so that current flows through the point of intersection of said protruding ends of said electrodes and said workpiece, whereby a joint arc is established between said electrodes and said workpiece.
An apparatus for automatic electric fusion welding of a current-carrying workpiece, comprising:
- (a) a joint holder movable in relation to said workpiece;
- (b) at least two current-carrying welding electrodes mounted in said joint holder, whereby an electric potential may be applied between each of said electrodes and said workpiece so that current flows through said electrodes and said workpiece;
- and
- (c) a feeding device for moving at least one of said electrodes with respect to said joint holder, said joint holder and said feeding device so constructed and arranged as to feed said electrodes at a relative angle of between 0.degree. and 180.degree. in such a manner that the protruding ends of said electrodes are at least randomly in physical contact at a point of intersection where the melting of electrode material occurs, said point of intersection being substantially fixed in relation to said joint holder, whereby the physical contact at the point of intersection of the protruding ends of said electrodes is automatically and continuously reestablished by said feeding device and a joint arc is established between said electrodes and said workpiece.
Dependencies are inferred from the claim text.