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Runnach Much of the Pre heating I do is to help prevent Heat destortion in flat plate 1">, Most would say this is is not nessary etc etc, however Iv generally found that "takeing the chill" off a plate ie no hotter than 150C will help stop quite a large amount of heat destortion....
When I asked the question on the problems I had regarding cracking hardox bucket edges I was supprised at the importance for pre heat, there was some debate on UKW, but all the guys who reguarly replaced them for large machines, pre warmed the plate, I am convinced that many dont and thats why cracking ocours across from the heat input on the adaptors..... Time will tell in 6 months from now If we have it right..
Finaly post heat, well this is very new to me, and recently happend on some EN8 (actually I think it was BS something but I cant remmber the grade without looking it up), I had to weld then machine, the problem was welding turned it to granite and imposible to work, head scratching etc, after quizing the usual suspects I found the solution to be, Pre Heat, again only to 150C or so, weld, Heat to cherry then burry in lime for a few hours, problem solved no work hardening...
Ohh and interpass stands to reason that one T fillet 2" plate,J prep, No Interpass observations, and you end up with something around 20 degress out...bugger
Just things Iv observed through work not sure if its all Rule followers
When I asked the question on the problems I had regarding cracking hardox bucket edges I was supprised at the importance for pre heat, there was some debate on UKW, but all the guys who reguarly replaced them for large machines, pre warmed the plate, I am convinced that many dont and thats why cracking ocours across from the heat input on the adaptors..... Time will tell in 6 months from now If we have it right..
Finaly post heat, well this is very new to me, and recently happend on some EN8 (actually I think it was BS something but I cant remmber the grade without looking it up), I had to weld then machine, the problem was welding turned it to granite and imposible to work, head scratching etc, after quizing the usual suspects I found the solution to be, Pre Heat, again only to 150C or so, weld, Heat to cherry then burry in lime for a few hours, problem solved no work hardening...
Ohh and interpass stands to reason that one T fillet 2" plate,J prep, No Interpass observations, and you end up with something around 20 degress out...bugger
Just things Iv observed through work not sure if its all Rule followers