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.
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。
For overhead pipeline, welding with basic-compound coated electrodes and pre-welding heating of the joint will reduce the joint thermal -stress.
采用碱性药皮焊条和焊前接头预热的施焊方法，焊接的空间管道接头热应力小。
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