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US 4,365,134 AGranted
Method of resistance welding
AssigneeMassachusetts Institute of Technology
InventorsThomas W. Eagar, Joseph G. Kaiser, Gregory J. Dunn
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Abstract
After measuring the bulk resistance the surface of high strength low alloy steel material is treated to form a high resistance coating on its surface. When resistance welding the material the coating permits weld formation without significant expulsion or excessive electrode force over a wide range of operating conditions.
Claims4
An improved method of resistance welding high strength low alloyed steel materials along a faying interface, the method comprising:
- (a) measuring the bulk resistance of said materials;
- (b) determining the optimal surface resistance for said materials so that when said materials are welded sufficient heat is generated at the faying interface while bulk heating of materials is minimized;
- (c) treating the surface of said materials to produce a coating which increases the surface resistance to obtain said optimal surface resistance and
- (d) resistance welding said treated materials.
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Dependencies are inferred from the claim text.