Q. Explain the procedure of Rockwell hardness tests?

Rockwell hardness tests per ASTM of the deposited weld, and heat affected zone shall be required for procedure qualifications of every welding process used. On production welds, hardness tests shall be obtained from the weld metal and heat affected zone of 5% of welds made by each separate weld procedure.

Report all hardness readings in excess of values shown above to OWNER. Review any corrective action with OWNER before proceeding.

Non-ferrous materials and austenitic stainless steel welds shall not require hardness testing.

If post-weld heat treatment (PWHT) is applied, perform the hardness tests after PWHT.

Ultrasonic Examination (UT):

Where full radiography of nozzle attachment welds is specified on vessel data sheet and radiographic interpretation is questionable owing to weld configuration, then such areas shall be UT examined.

When nozzles require ultrasonic examination, weldment shall be examined prior to fitting the reinforcement pad.

Magnetic Particle and Liquid Penetrant Examination (MT) & (PT)

Magnetic particle examination procedure shall be in accordance.

The elevation of indications and acceptance criteria for magnetic particle examination shall be in accordance.

Where magnetic particle examination is called for and material is not magnetic, liquid penetrant examination shall be substituted.