Abstract
Abstract:
P91 and 10CrMo9-10 creep resistant steels are critical to the performance of boiler tubes and power generating plants in general.
Components made from these materials are mainly joined by welding. This paper reports on the comparative study of the effect
of TIG and SMAW welding on the mechanical performance of P91 and 10CrMo9-10. TIG was used for root welding while
SMAW was used for weld filling of V-butt joints. Specimens of the two alloys prepared using recommended welding procedures
are evaluated using optical microscopy and Vickers micro hardness assessment. Some specimens were post weld heat treated
while others were not. Post weld heat treated (PWHT) specimens exhibited similar properties as the corresponding base materials
for both steels. TIG welding resulted in significant grain size reduction in both steels. PWHT produced more consistent grain
structure, which is favorable.