Method and apparatus for high frequency electrical cast welding and surface hardening
First Claim
1. A method of welding together a pair of metal parts at their edge surfaces with weld metal deposited at a predetermined point in which method said parts are advanced in a predetermined direction to and beyond said point with edge surfaces thereof in facing but spaced relation, said method comprising:
- at said point, melting weld metal to be deposited by inducing a high frequency electrical current therein with an induction coil energized by said current and depositing the molten weld metal on said surfaces;
heating the metal at said surfaces upstream of said point by causing high frequency electrical current to flow along said surfaces with additional current supplying means in addition to said induction coil and disposed upstream of said point, the current flowing along said surfaces being selected to cause the metal at said surfaces to melt by the time said surfaces are advanced to said point, whereby the weld metal is deposited on molten metal of said surfaces; and
downstream of said point, cooling the melted metal and the metal at said surface which has been heated to melting temperature.
0 Assignments
0 Petitions
Accused Products
Abstract
Method and apparatus for depositing metal on, and bonding it to, a metal part or parts, either to provide hard facing metal on the metal part or to produce a cast weld between the parts. In the method, the metal to be deposited is melted before depositing it by an induction coil supplied with high frequency electrical current. The metal part or parts are advanced toward a point where such metal is deposited, and in advance of such point, the surface of the metal part, or for welding, the surfaces of the metal parts to be joined, are heated to melting temperature by high frequency electrical current. The high frequency current is supplied to such surface or surfaces by the same induction coil, by a separate induction coil or by contacts engaging the metal part or parts.
13 Citations
31 Claims
-
1. A method of welding together a pair of metal parts at their edge surfaces with weld metal deposited at a predetermined point in which method said parts are advanced in a predetermined direction to and beyond said point with edge surfaces thereof in facing but spaced relation, said method comprising:
-
at said point, melting weld metal to be deposited by inducing a high frequency electrical current therein with an induction coil energized by said current and depositing the molten weld metal on said surfaces; heating the metal at said surfaces upstream of said point by causing high frequency electrical current to flow along said surfaces with additional current supplying means in addition to said induction coil and disposed upstream of said point, the current flowing along said surfaces being selected to cause the metal at said surfaces to melt by the time said surfaces are advanced to said point, whereby the weld metal is deposited on molten metal of said surfaces; and downstream of said point, cooling the melted metal and the metal at said surface which has been heated to melting temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. Apparatus for welding together a pair of metal parts being advanced in a predetermined direction, said apparatus comprising:
-
a body of weld metal disposed adjacent a predetermined point, said body having an end; a pair of metal parts with facing and closely spaced but separated edge surfaces being advanced with said surfaces passing said point in spaced relation to said end; a high frequency heating means in the form of an induction coil having a portion at least partially encircling said body adjacent said end and in spaced relation thereto; additional high frequency heating means in addition to said coil in advance of said point for heating metal at said surfaces to melting temperature as they are advanced to said point; and a source of high frequency current connected to said coil and to said additional high frequency heating means and heating said surfaces and said body to melting temperature at said point. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
-
Specification