Electric heating – Metal heating – For bonding with pressure
Reexamination Certificate
2001-07-17
2003-05-13
Shaw, Clifford C. (Department: 1725)
Electric heating
Metal heating
For bonding with pressure
C324S451000
Reexamination Certificate
active
06563073
ABSTRACT:
This invention relates to the welding of metals, and particularly the welding of metals using the thermo-electricity output of the metals being welded to control and evaluate the welding process.
BACKGROUND OF THE INVENTION
It is commonplace, in the manufacture of a wide variety of electronic and/or fabricated metal parts require spot welds to weld together two metals, and frequently metals which are dissimilar to each other. One of the difficulties that has been incurred by the prior art in welding such metals is the inability to accurately control the power used in the welding operation and hence the quality of the weld itself. It has been proposed, as described in U.S. Pat. Nos. 4,019,364, 4,392,044 and 5,298,711, to either evaluate the quality of a weld or to control the welding operation using the welded part as a thermocouple.
The techniques as described in the afore-mentioned patents suffer from the disadvantage of not being suitable to both control and evaluate in the same operation the welding process.
It is accordingly an object of the present invention to provide a new and improved method for the welding of metals using the thermoelectricity output of the metals being welded to both control and evaluate the welding process.
It is a related object of the present invention to provide a method for the welding of metals in which the weld current is optimized using the resistance of the metals being welded and the rate of cooling of the metals being welded as a measure of the mass of the metals.
It is a more specific object of the invention to provide a method for the welding of metals in which an initial pulse of current is applied to the metals being welded to enable the resistance of the metals to be calculated and to enable the mass of the metals to be determined by the rate of cooling of the metals for use in the determination of the necessary welding energy required to effectively weld the metals.
It is yet another object of the invention to provide a method for the control and evaluation of the welding of metals in which the rate of cooling of the welded metals is used to evaluate the quality of the weld.
REFERENCES:
patent: 4019364 (1977-04-01), Maddox
patent: 4392044 (1983-07-01), Wang et al.
patent: 5298711 (1994-03-01), Leon
patent: 5721415 (1998-02-01), Fortmann et al.
patent: 5726409 (1998-03-01), Fortmann et al.
patent: 6265688 (2001-07-01), Lyshkow
Bell Boyd & Lloyd LLC
Hamamatsu Corporation
Shaw Clifford C.
LandOfFree
Method of welding metals and apparatus for use therefor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of welding metals and apparatus for use therefor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of welding metals and apparatus for use therefor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3009442