Electricity: conductors and insulators – Conduits – cables or conductors – Conductor structure
Reexamination Certificate
1998-04-13
2001-06-12
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
Conduits, cables or conductors
Conductor structure
C174S126200
Reexamination Certificate
active
06246008
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention concerns a process for producing a core wire for welding electrodes based on iron, nickel, cobalt, copper and/or aluminum. The invention also concerns such an electrode core wire.
The use of solid and filler wires which are available on the market as core wires for the production of welding electrodes gives rise to problems in regard to the rise in temperature of the electrode in the welding operation, which in many cases becomes red-hot. In the case of electrodes which are produced from filler wire, deficiencies occur due to the thin sheathing, while in addition in this case also a substantial increase in temperature and destabilization of the arc in the welding operation is to be noted.
If electrodes involving a complex alloy composition are to be produced, non-standardized core wires are very rarely to be found on the market, with the consequence that it is scarcely possible to obtain them, in particular when small delivery amounts are involved.
As a reduction in manufacturing costs would be a major market advantage when producing core wire products, the inventor set himself the task of improving the a process from a cost and quality standpoint.
SUMMARY OF THE INVENTION
In endeavours to find a method of matching the chemical analysis of a core wire relatively easily and without difficulties, even for small production quantities, the solution to the problem was found in accordance with the process for producing a core wire for welding electrodes comprising the steps of providing a core of an alloy selected from the group consisting of alloys of iron, nickel, cobalt, copper, aluminum and mixtures thereof; providing an inner sheathing around the core; and providing an outer sheathing around the inner casing.
In the process according to the invention for producing a core wire for welding electrodes based on iron, nickel, cobalt, copper and/or aluminum, a filler or solid wire of the same or different chemical composition as the core wire is sheathed at least once. For that purpose it has been found desirable that two or more metal strips lying one upon the other afford a market in terms of cost expenditure or sale for such products, the inventor set himself the aim of improving the process and a core wire of the kind set forth in the opening part of this specification.
It is also in accordance with the invention for at least one metal strip to be shaped to form a channel-like blank of part-circular cross-section and for a filler wire or a metal wire to be laid therein, whereafter the blank is closed in respect of its cross-section. The surfaces of the wires and/or strips forming the core wire are in accordance with the invention also to be subsequently treated thermally or chemically.
In accordance with a feature of the invention the core wire has a core which is sheathed a plurality of times. That core wire can be a filler wire which is sheathed at least once or a sheathed core comprising a powder or a solid wire which is sheathed at least once.
In regard to the choice of the alloys for the sheathing and the casing of the filler wire reference is made to claims
9
to
24
.
It may be advantageous for both the sheathing and also the inserted solid wire to comprise an iron alloy, a nickel alloy or a copper alloy. Further configurations are to be found in claims
26
,
28
and
30
.
Improvements are also achieved by the step of selecting the outside diameter of the core wire which is produced in accordance with the process, at between 1.6 and 6.0 mm. A strip for the outer casing of the core wire is to be of a strip thickness of 0.1 to 0.8 mm, preferably 0.2 to 0.5 mm, and/or a strip for producing the inserted filler wire is to be of a strip thickness of 0.2 to 0.5 mm. The ratio between the wall thickness of the outer casing and the thickness of the inner casing is preferably selected at between 1:1 and 1:2.
In accordance with the invention the filling of the filler wire is to contain hard substances such as borides, carbides, nitrides and silicides and/or as deoxidizers elements such as silicon, manganese or the like. Oxides, silicates, carbonates or the like can be included in the filling of the filler wire as arc stabilizers.
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Belgian Patent 777588 published Apr. 17, 1972.
Fluckiger Jean-Louis
Wabnegger Johann
Bachman & LaPointe P.C.
Castolin S.A.
Mayo III William H.
Reichard Dean A.
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