请您提供焊前预热和焊后预热处理的规范。
Please give the standards of the preheat before welding and those of the heat-treatment after welding.
通过焊前预热、层间温度控制及焊后热处理等手段获得了满足质量要求的焊缝。
With the methods of the pre-heating before welding, controlling the interlaminar temperature and the heat treatment after welding, the welds that satisfy the quality specifications can be available.
但由于室外温度比较低，要求预热到室温后再进行焊接操作的焊前预热可不作记录。
However, if outdoor temperature is comparatively low, the records preheating aren't required for the welding operation preheating to room temperature.
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