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本文阐述了低合金高强钢厚壁压力容器的焊接特点。在确定焊接预热、层间和后热温度的时候,必须综合考虑焊工的操作条件、接头性能和防止裂纹的产生。厚壁容器焊接时的层间保温对氢的逸出造成了有利的条件。试验表明,在预热温度下的层间保温可以使预热温度降低50℃,通过试验,确定了最低的预热和层间保温温度。除了预热和层间保温外,后热(去氢处理)是防止焊接接头开裂的重要措施。后热300～350℃,保温1小时,足以获得完好的焊接接头,降低后热温度必须延长后热时间,如果在预热温度下延长保温时间,则至少保温在8～10小时以上,文中还列出了后热温度与后热保温时间之间关系的试验结果。最后,模拟筒节的焊接试验证实了试验结果的可靠性。
This article describes the welding characteristics of low alloy high strength steel thick wall pressure vessels. In determining the welding preheating, interlayer and post-heating temperature, we must consider the welder’s operating conditions, joint performance and prevent the generation of cracks. The interlayer insulation during thick-walled vessel welding creates advantageous conditions for the escape of hydrogen. Experiments show that the preheating temperature of the interlayer insulation can make the preheating temperature is reduced by 50 ℃, through the test to determine the minimum preheating and the temperature of the interlayer insulation. In addition to preheating and interlayer insulation, post-heating (dehydrogenation) is an important measure to prevent cracking of welded joints. After the heat 300 ~ 350 ℃, heat 1 hour, enough to get a good welded joints, reduce the post-heat temperature must be extended after the heat time, if the preheat temperature to extend the holding time, then at least insulation in 8 to 10 hours or more The experimental results of the relationship between the post-heating temperature and the post-thermal holding time are listed. Finally, the simulation of the welding of the tubular section confirmed the reliability of the test results.