• The conventional quality control of spot welding,
  – Guarantee of quality => Breaking test
  – Quality identification => Driver check (DC)The inspection method replaced with this Driver check (DC) is proposed.
  Practical application of non-destructive inspectionusing magnetism.
  A nugget can be quantified.
• Applicable cases – shipping inspection
• The nugget profiler can be used at parts companies.
  (1) All parts in a production lot are quantified: Variations in the lot can be confirmed.
  (2) Then, a single piece can be sampled out of the lot and subjected to breaking test to assure
  the quality.

Note: The outflow of defective parts can be prevented.
(Parts other than those subjected to breaking test can also be checked for quality.)

• Inspection theory outline and sensor structure.
• A magnetization coil is used as an electromagnet by sending current through a magnetization coil.
• The magnetic field which occurred with the electromagnet is made to permeate the inside of spot welding.
• The magnetic flux which occurred by the magnetic field is interrupted rapidly.
• It makes a detection arrangement coil generate induced electromotive force. I acquire this induced electromotive force as a detection signal.
• Distribution of the amplitude permeability which the detection array coil acquired is made into a graph. This judges quantification of a nugget, and the existence of nugget.