Although deformation increased, the high reheating interpass temperature
resulted in the easy mobility of the high angle grain boundaries of the recrystallized grains, and the grain growth was rapid according to the Arrhenius relationship.
To produce the optimum mechanical properties and corrosion resistance, heat input and interpass temperature
should be carefully controlled.
1/16-1/8 Preheat Temperature, [degrees]F 200-600 Interpass Temperature
, [degrees]F 150 (a) 100 amps per 0.10-inch of material thickness Table 2.
Preheating and interpass temperatures
were strictly controlled in the range of 100[degrees]C~150[degrees]C.
However, to keep interpass temperatures
from getting too high, the shell needs time to cool, so actual welding time is longer.
Remember that preheating, interpass temperatures
, cooling rate, and post heat treatment are critical to all forms of wearsurfacing, including PTA.