LaserTherm
Lasers for Industrial
Applications
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Laser hardening

Laser hardening

No or minimum need
for refinishing work

Laser hardening

Laser hardening

On-line control of processing temperature

Laser hardening

Laser hardening

High reproducibility
for mass production

Laser hardening

Laser hardening

Processing only where desired

Laser welding

Laser welding

Small heat-affected zones

Laser welding

Laser welding

Smooth, symmetrical welded
joint free of porosities

Laser welding

Laser welding

High processing stability and speed

Hardness measurement

Hardness measurement

by the UCI method measurement
in hard-to reach spots

Hardness measurement

Hardness measurement

by the UCI method measurements
of the welds and thermally processed parts

Laser systems

Laser systems

Design of technological processes
and optimization of process parameters

Laser systems

Laser systems

Delivery and implementation
of customized laser systems

Hardness measurement

Ultrasonic Contact Impedance (UCI)

Like other standard hardness measuring methods by Vickers or Brinell, the size of an indentation, caused by the indenter in the material in question, corresponds with the hardness number on the UCI method scale. However, the hardness number is not determined by the measurement of the sizes of diagonals within the indentation, but instead the area of indentation is determined by the electronic measurement of ultrasound frequency. The UCI probe features Vickers diamond pyramid attached to the lower end of a metal rod. The rod is set vibrating through the use of piezoelectric converters. The ensuing longitudinal oscillation has a frequency of about 70 kHz.

The tested material, hit by a diamond pyramid, alters the frequency of the oscillations. The frequency change is proportional to the depth of the indentation and thus constitutes the hardness of the tested material. The softer the material, the greater the indentation and frequency change.

The frequency change also depends on the material's modulus of elasticity, so this factor must always be always taken into consideration when using the UCI method. When measuring the hardness of materials with different moduli of elasticity, the UCI hardness tester must be calibrated. Then it can be used for measuring the hardness of all materials with the same moduli of elasticity. Present-day testers can be calibrated quickly and precisely on the spot.

UCI method is suitable for:

  • Small castings
  • Weld testing
  • Common workpieces
  • Measurements in grooves and bores
  • Measurements of cogs
  • Measurements of blades, sheets and pipes
  • Finally machined parts
  • Thermally processed parts
  • Coatings and layers
  • Measurements in hard-to-reach spots

Besides metal hardness measurement we offer some other services in the field of laser technologies:
laser welding, laser hardening, laser cladding and equipment solutions.

Contact

LaserTherm spol. s r.o.
Tylova 1/57
316 00 Plzeň

Phone: +420 373 700 270
Fax: +420 373 700 273
E-mail: info@lasertherm.cz

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