Application / Continuous drawing line


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About Continuous drawing line

  • Input control: Identification of bad quality rolled wire (drawing lines for thick wire)
  • Process control: Monitoring of production lines to avoid scrap (medium and fine drawing blocks)
  • Final inspection: Assurance of crack-free material after last drawing operation or in rewinding plants
  • Typical defects: Laps, holes, longitudinal cracks, tension cracks from annealing, damage from transport devices, damage through defective drawing dies
  • Production line: Single and multiple drawing lines, rewinding lines, all materials
The surface of drawn wire and tubing must be free of cracks, holes and other material defects as even small surface defects can lead to defective end products, critical in items such as surgical instruments. Eddy current testing is extremely successful in detecting surface defects at various stages during the production process. For the best test results, encircling testing is used together with rotational testing.

Eddy current probe types


  • Encircling inspection. A robust, simple encircling coil surrounds the test piece and detects a multitude of defects in ferrous (with magnetization) and nonferrous materials.
  • Rotational testing. The eddy current probes of the rotating system spin around the test piece as it moves through the equipment. The rotating system is particularly sensitive to longitudinal defects and excellent for large tube diameters (up to 130 mm (5 1/8 in). PRÜFTECHNIKs series of rotating systems (RS35HS, RS65, RS130) was designed for easy operation and maintenance, and with the raw industrial environment in mind.

Reated Projects

Hot rolled ferritic rod

  • Quality control: Detection of defective areas in test material and assignment of test piece to a quality category 
  • Process control: Identification of defective rolling element

Hot rolled bar and rod

  • Quality control: Detection of defective areas in test material and assignment of test piece to a quality category 
  • Process control: Identification of defective rolling e

Sheathed products

Eddy current technology can be used to detect splices, connecting wedges or joint inside coated material such as steel tubes with PVC insulation. In this example, an EDDYSENSOR and an e

Multivoid tubing

Air conditioner tubing is inspected inline after extrusion. An encircling coil tests for outer surface defects and checks that the walls of the interior chambers are intact. It is spec