双钨极堆焊技术在核反应堆压力容器制造中的应用与研究

按照核反应堆压力容器不锈钢堆焊工艺评定,分别堆焊了单钨极与双钨极不锈钢堆焊层,通过对比分析两者的焊缝成形、金相组织、硬度分布、化学成分、冲击性能、晶间腐蚀等,说明双钨极与单钨极的主要区别。结果表明,双钨极与单钨极堆焊均能获得良好的焊缝成形,但双钨极焊接效率较单钨极有大幅提升。双钨极与单钨极焊缝其金相组织、硬度分布、冲击性能和晶间腐蚀性能等较为接近。该技术已开始应用于反应堆压力容器的制造。

Application and research of twin-electrode TIG cladding process on reactor pressure vessels manufacturing

According to reactor pressure vessel stainless steel cladding qualification,this paper conducted stainless steel cladding by single TIG and twin-electrode TIG,respectively. The main difference between double tungsten and single tungsten is illustrated by investigating and comparing the weld formation,metallographic structure,hardness distribution,chemical composition,impact properties and intergranular corrosion. Results show that both twin-electrode TIG and single TIG can produce excellent weld bead formation,but the efficiency of twin-electrode TIG cladding is much higher. And the weld bead properties produced by the two methods are similar. Twin-electrode TIG cladding process has been applied to the manufacture of reactor pressure vessels.