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一、概述众所周知,大型部件的焊缝热处理一直是一项难以解决的问题。这是由于因为焊缝热处理往往是低于Ac_1温度以下的低温退
I. Overview As we all know, large parts of the weld heat treatment has been an unsolved problem. This is due to the fact that weld heat treatments tend to retreat below Ac_1 temperatures