Quality Assurance

Quality Assurance

The highest level of quality management, suitable for nuclear power plants


Takenaka products are playing vital roles in supporting social infrastructure such as bridges and highways, as well as petroleum plants and wind power stations where high degrees of durability and safety are required. We have earned the trust of our customers in Japan, of course, for our thorough quality management, and also from customers overseas. Our products are used in all nuclear power plants in Japan, meeting their high safety standards.Takenaka has established the ISO9001 quality assurance program, according the international quality assurance system; received JIS certification for nuts and bolts; and certification from the Minister for Land, Infrastructure and Transport for bolt sets for wind generated power equipment support. Takenaka’s Monozukuri ensures traceability through consistent in-house material procurement, heat treatment, machining, testing and inspection, and quality assurance. Steel stock information is stored with mill certificates, which record the manufacturing history, and is managed with proper identification. Mill certificates specify the steel stock supplier, manufacture date, chemical composition, mechanical properties, applicable standards, etc. To prove ourselves worthy of the trust in our products, we maintain a range of inspection and testing equipment. We also provide calibration records for all our testing and inspection equipment on request. The "Octagon-T mark" engraved on our products signifies that they have past all our tests, symbolizing Takenaka's uncompromisingly high quality standard.


Facilities of Inspection and Test

Main Facilities of Inspection and Test For Quality Assurance of Takenaka Products

ねじアイコンUniversal Tension Testing Apparatus

Universal Tension Testing Apparatus
  1. Yield point, tensile strength, elongation, area reduction, and other tensile properties are evaluated with the sample piece tested through fracture.
  2. Tests at high temperatures possible (up to 1000℃)
  3. Maximum load 2000kN

ねじアイコンCharpy Impact Tester

Charpy Impact Tester
  1. Absorbed impact energy and toughness are evaluated with the sample piece tested through impact fracture.
  2. JIS and ASTM types of testers available.
  3. Tests at low temperatures possible (such as -101℃)

ねじアイコンBolt Testing Apparatus (Torque Tester)

Bolt Testing Apparatus (Torque Tester)
  1. The torque coefficient of a set of nut and bolt is evaluated by measuring the torque vs. axial force relation. Testable range of nominal diameter M12-M64.

ねじアイコンTriaxial Creep Testing Machine

Triaxial Creep Testing Machine
  1. Creep properties and time at break are evaluated with the sample piece tested under a constant load applied for a long time at a high temperature.
  2. A simultaneous test of 3 samples possible.
  3. Maximum temperature 1100℃
  4. Maximum load 25kN

ねじアイコンOptical Emission Spectrometer

Optical Emission Spectrometer
  1. The mixture of lights emitted from a spark-discharged sample piece is analyzed with their wave lengths and intensities to determine the chemical composition.

ねじアイコンUltrasobic Flaw Detector

Ultrasobic Flaw Detector
  1. Internal defects and flaws are detected by analyzing the echo of an ultrasonic wave irradiated on the sample.

ねじアイコンMagnetic Particle Flaw Detector

Magnetic Particle Flaw Detector
  1. Flaws on or near the surface are inspected by magnetizing the sample and pouring inspecting liquid mixed fine magnetic particles on it so as to give some detectable pattern.

ねじアイコンWater-Washable Penetrant Flaw Detector

Water-Washable Penetrant Flaw Detector
  1. Flaws on the sample surface are detected via the marker penetrant in aqueous solution permeating into the flaws.

ねじアイコンSurface Roughness / Contour Shape Analyzer

Surface Roughness / Contour Shape Analyzer
  1. Surface roughness, dimension, angle, diameter, etc. are evaluated by analyzing the information from the stylus made in contact with the sample.

ねじアイコンMeasuring Microscope

Measuring Microscope
  1. Dimension, angle, diameter, etc. are evaluated by analyzing the optical image of the test object.

ねじアイコンCombined Cyclic Test Apparatus (CCT)

Combined Cyclic Test Apparatus (CCT)
  1. Salt-sprayed, dry, and humid environments can be set up in a cyclic or an arbitrary mode to examine the corrosion-resisting properties of the sample.

ねじアイコンScanning Electron Microscope/Energy Dispersive X-ray Spectrometer (SEM/EDS)

Scanning Electron Microscope/Energy Dispersive X-ray Spectrometer (SEM/EDS)
  1. Checking component distribution, surface unevenness, and coating thickness by exposing coating and metal material cross sections to electron beam
    Can be observed at magnifications up to 300,000 times

ねじアイコンTransmission Electron Microscope (TEM)

Transmission Electron Microscope (TEM)
  1. The structure of a thin film specimen is visualized by the transmitted electron beam to show, e.g., the distribution of differing components in a polymer coating.
  2. Maximum magnification 850,000.