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众所周知,按照我国和一些国外压力容器没计规范规定,无论是碳素钢或低合金钢制压力容器筒体,当壁厚超过一定厚度后,要求对筒体拼装的环焊缝必须进行焊后热处理,以消除焊接应力、软化组织。这种焊后热处理给制造厂带来了一定的困难。设备整体热处理需要大型热处理炉;在环焊缝处进行局部热处理也需要相应的工频热处理装置或红外热处理装
As we all know, in accordance with our country and some foreign pressure vessels did not regulate the norms, whether it is carbon steel or low alloy steel pressure vessel cylinder, when the wall thickness exceeds a certain thickness, the requirements of the cylinder assembly of the girth weld must be after welding Heat treatment to eliminate welding stress and soften tissue. This post-weld heat treatment to the manufacturer has brought some difficulties. The overall heat treatment equipment requires large-scale heat treatment furnace; in the girth weld local heat treatment also requires the corresponding power frequency heat treatment equipment or infrared heat treatment equipment