hello,
we (at work) have some problems... we must write for a customer a procedure that describes how to and what precautions are to be taken when welding SAE 1045 steel to API K55 grade casing pipe in the field... more precisely, a 13-5/8" socket weld casing head to pipe... we know we must preheat to 500 ºC (aprox.) and let it cool slowly, by means of a thermic "blanket" or similar... are there any other critical steps to take into consideration? were can we find more information? any help will be greatly appreciated...

thank you very much,

Matías