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人气:299 评论:0 日期:2018-05-15 10:56:33


The condenser is first welded, and the bevel is easy to clean before welding. The air at the gap between tube and tube can be removed from both sides. It is very beneficial to prevent weld holes and ensure the quality of welding joint. At the same time, after expansion, the residual stress after expanding will not relax, avoiding the relaxation due to the influence of welding temperature. However, for welded joints of tube and tubesheet with poor weldability, micro cracks are easy to occur when welded joints are expanded and even weld cracks are expanded. In this case, the depth expansion should be adopted to avoid the welds, thus reducing the influence of expansion on the weld, which is also the biggest shortage of the condenser first welding and expansion process.

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