Apparatus for the automatic inducement of a magnetic field in an

Details Apparatus for the automatic inducement of a magnetic field in an Apparatus for the automatic inducement of a magnetic field in an

1982-06-04

1984-11-13

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Current through test material forms test magnetic field

324216, 324262, G01N 2784, G01R 3312

Patent

active

044828659

ABSTRACT:
An automatic overhead trolley-driven magnetizing system for inducing a residual magnetic field in seamless steel pipe in order to detect non-visual defects therein by the magnetic particle inspection method is described. The magnetizing system consists of a trolley-driven magnetizing unit which moves on an overhead runway until a retractable limit switch causes the unit to stop upon reaching the trailing end of the pipe, an electrical contact pad then lowers onto the surface of the pipe, and introduces a magnetizing current to the pipe sufficient to cause magnetic particles deposited on the pipe surface to indicate the location of defects in the pipe. The magnetizing system is arranged to remain remote from the manufacturing flow path of the workpiece until the magnetization thereof is required.

REFERENCES:
patent: Re19611 (1935-06-01), DeForest
patent: 2990512 (1961-07-01), Gewartowski et al.
patent: 3271663 (1966-09-01), Gewartowski et al.
patent: 3311819 (1967-03-01), Miller
patent: 3939404 (1976-02-01), Tait
patent: 4041379 (1977-08-01), Karlsson
patent: 4314203 (1982-02-01), Haberlein
patent: 4339714 (1982-07-01), Ellis

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