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US 3,940,624 AGranted
Apparatus and a method for testing the integrity of a weld
AssigneeP. R. Mallory & Co. Inc.
InventorEugene C. Simmons
Life of this patent
Estimating the term…
Abstract
A beam of spectral energy is directed onto a weld spot and the integrity of the weld is measured by the strength of the reflected beam or of the transmitted beam, which may also involve a function of the refractive characteristic effect of the weld spot on the incident beam.
Claims6
The method of testing the structural integrity of a composite weld between two metal plates used as a terminal element and closure for a battery which comprises the steps of:
- 1. placing a material adjacent to and in contact with a first side of the weld spot area of the test specimen, the refractive index of said material measurably varying in response to varying temperatures transmitted thereto from the test specimen, the temperature transmitted being a function of the density of the weld between the two metal plates;
- 2. directing an incident beam of monochromatic light on a first side of said material of step (1), said beam of light emitted from a source positioned adjacent said material of step (1);
- 3. heating the test specimen by subjecting the second side thereof to a beam of infrared energy;
- 4. determining the integrity of the weld by measuring the degree of refraction of the reflected, refracted beam of monochromatic light by means of a detector device, the degree of refraction of said incident light beam being a function of the temperature of the material of step (1), which in turn is a function of the output temperature of the spot weld.
1 more element
Apparatus for testing a spot weld between two metal discs used as a terminal element and closure for a battery comprising:
- 1. means for heating the specimen to be tested for the integrity of the weld, said means comprising a source of infrared energy disposed on a first side of said test specimen;
- 2. a material placed adjacent to and in contact with the second side of the weld spot area of the test specimen, said material characterized by a refractive index which measurably varies in response to varying temperatures transmitted thereto;
- 3. a source of monochromatic light disposed adjacent said material whose index of refraction is being varied such that an incident beam of light may be directed on said material;
- 4. a detector for measuring the degree of refraction of the incident beam of monochromatic light directed on said material disposed adjacent to the weld spot area of the test specimen;
- 5. and an indicator to be energized from said detector.
2 more elements
Dependencies are inferred from the claim text.