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18.为什么有的产品在焊接后要立即进行加热(即后热)?一般后热的规范是什么? 有些材料及产品要求焊后立即进行加热,后热的目的主要是为了使焊缝中的氢气尽快扩散出去,避免产生延迟裂纹,同时可减少些焊接应力。一般后热的规范为加热到300～400℃左右,保温0.5～8小时。根据材料的不同,产品结构的不同及产品的要求不同等等,加热温度及保温时间有所不同。
18. Why do some products should be heated immediately after welding (ie, after the heat)? What is the general post-heating specification? Some materials and products require heating immediately after welding, the purpose of post-heating is mainly to make the weld Hydrogen as soon as possible to spread out to avoid delayed cracks, while reducing some of the welding stress. General post-heating specifications for heating to about 300 ~ 400 ℃, holding 0.5 to 8 hours. According to the different materials, different product structure and product requirements, etc., the heating temperature and holding time are different.