Hardness requirements for welds shall be as per the Welding Specification Chart/Non Destructive Examination Specification included in welding contract. Hardness testing shall be carried out by Vickers Hardness Tester during welding procedure qualification and shall be cross sectional.

For production welds, hardness testing shall be carried out by portable digital hardness testers. Poldi hardness tester shall not be permitted. Contractor shall produce documentary evidence/calibration certificate to the Owner’s Inspector and obtain approval of the hardness testing equipment.