Portable hardness testing is used when a test object is too large to be examined in a testing lab. It is useful on-site, for example, for checking that the correct heat treatment has been carried out on welded items or that welded joints comply with the hardness limits specified in the norms or by respected industry bodies. Portable hardness testing techniques are quick and economical.
Hardness testing of metals is conducted so that one may correlate the results with another material property of interest, such as tensile strength or resistance to abrasion. Too soft, and a material may not be strong enough for its intended purpose. Too hard, and it may be brittle and subject to cracking.
Many codes and specifications specify hardness testing of materials in the field after such activities as oxyacetylene cutting, cold bending, post weld heat treatment etc. The hardness of a material, a weld or a heat-affected zone is a decisive parameter that can determine the remaining lifetime of a material and its deterioration due to overheating.
Our personnel has the required experience level and expertise to professionally perform any field hardness testing. They use the latest GE Portable Hardness Testing Technology to provide the most accurate field hardness readings. All hardness tests are performed according to the verified and approved written procedure which takes into account special considerations for equipment calibration, surface preparation, removal of unrepresentative material (paint, oxides, decarburized layer) and the methodology of taking the readings, which are very important in demanding applications like hardness testing of the P91 material grade. The use of modern technology, according to our procedure guarantees reliable measurements.
NICKEL provides field hardness testing services by Ultrasonic Contact Impedance (UCI) method and rebound method. We utilize portable hardness techniques to inspect ferrous and non-ferrous metals, and their alloys, welds, weld heat affected zones (HAZ), castings and forgings, machined parts, stress relieved material, and in-service components like piping, pressure vessels, or structural steel.
We hold the following HT equipment: