Impact test and hardness test in the same PQR?
Impact test and hardness test in the same PQR?
(OP)
Hi all.
Last week I came across a PQR which has both impact test and hardness test conducted in one PQR. I find that rather odd. Impact tests are for cold service, and thus you'd think that the weldment or material itself will need to be ductile (thus no point in taking hardness test). Hardness tests are for brittle material, in that you want to control the hardness post-weld.
Was the PQR "odd" (read: WRONG), or do I need to tweak my understanding a little bit?
Knowledge-enhancing replies, tips, pointers, sarcastic information, are much appreciated, :)
Last week I came across a PQR which has both impact test and hardness test conducted in one PQR. I find that rather odd. Impact tests are for cold service, and thus you'd think that the weldment or material itself will need to be ductile (thus no point in taking hardness test). Hardness tests are for brittle material, in that you want to control the hardness post-weld.
Was the PQR "odd" (read: WRONG), or do I need to tweak my understanding a little bit?
Knowledge-enhancing replies, tips, pointers, sarcastic information, are much appreciated, :)





RE: Impact test and hardness test in the same PQR?
RE: Impact test and hardness test in the same PQR?
RE: Impact test and hardness test in the same PQR?
Your first misconception is confusing 'ductility' with 'low-temperature toughness'. They are related but not the same.
The second is thinking 'Hardness tests are for brittle material'. Most often with ferritic steels hardness tests are used to measure the weld and heat-affected zone hardness. There are various reasons to limit hardness, although it is a rather crude indicator of some other properties.
RE: Impact test and hardness test in the same PQR?