Caustic embrittlement cracking can be effectively prevented by means of PWHT at a temperature of _______.
Caustic embrittlement cracking can be effectively prevented by means of PWHT at a temperature of _______.
Caustic embrittlement cracking can be effectively prevented by means of a Post Weld Heat Treatment (PWHT) at a temperature of 1150º F. This temperature is considered effective for stress-relieving treatments in carbon steel, which is necessary to prevent such types of embrittlement. Therefore, the correct answer is 1150º F.
Cracking can be effectively prevented by means of a stress-relieving heat treatment (e.g. PWHT). A heat treatment at 1150 °F (620 °C) minimum with a minimum holding time of 1 hr is considered an effective stress relieving heat treatment for carbon steel. The same requirement applies to repair welds and to internal and external attachment welds.