核主泵屏蔽套近无缺陷激光焊接技术

发布时间：2018-05-28 11:57

本文选题：核主泵屏蔽套 + 激光焊接　；参考：《机械工程学报》2015年15期

【摘要】：针对我国AP1000核主泵屏蔽套焊接过程存在的问题,提出一种近无缺陷激光焊接技术,实现屏蔽套材料Hastelloy C-276的优良焊接成形。分析激光焊接过程对材料微观组织的影响规律,评价核主泵温度条件下焊接接头拉伸性能;研究焊缝在酸碱盐中的电化学腐蚀行为,评价焊缝耐腐蚀性能。通过有限元法计算屏蔽套焊接变形特征,揭示横向收缩变形对制造精度的影响。结果表明,所提出的脉冲激光焊接技术可以实现核主泵屏蔽套材料的优良焊接成形,焊缝处无明显焊接缺陷;在核主泵温度条件下,焊接接头力学性能与母材基本相当,可以保证长使役可靠性;焊缝在中性及酸性环境下,腐蚀性能均优于母材,提升了焊缝的可靠性。通过模拟计算发现激光焊接会导致焊接样件发生横向收缩变形,但该变形大小仅为屏蔽套制造精度的1/10,焊接精度完全满足屏蔽套制造要求。
[Abstract]:In view of the problems existing in the welding process of shield sleeve of AP1000 nuclear main pump in China, a kind of near defect free laser welding technology is proposed to realize the excellent welding forming of shielding sleeve material Hastelloy C-276. The effect of laser welding process on the microstructure of materials was analyzed, and the tensile properties of welded joints were evaluated under the conditions of nuclear pump temperature, the electrochemical corrosion behavior of weld in acid and alkali salt was studied, and the corrosion resistance of weld was evaluated. The deformation characteristics of shield sleeve welding are calculated by finite element method, and the influence of transverse shrinkage deformation on manufacturing accuracy is revealed. The results show that the proposed pulsed laser welding technology can realize the excellent welding forming of the shielding sleeve material of the nuclear main pump, and there is no obvious welding defect in the weld seam, and the mechanical properties of the welded joint are basically equivalent to that of the base metal under the condition of the nuclear main pump temperature. The corrosion resistance of the weld is superior to that of the base metal in neutral and acidic environment, which improves the reliability of the weld. The simulation results show that laser welding will cause transverse shrinkage deformation of the welding sample, but the deformation is only 1 / 10 of the manufacturing accuracy of the shield sleeve, and the welding precision fully meets the manufacturing requirements of the shield sleeve.
【作者单位】：大连理工大学精密与特种加工教育部重点实验室;
【基金】：国家重点基础研究发展计划(973计划,2009CB724307,2015CB057305) 创新研究群体科学基金(51321004) 国家自然科学基金(51175061)资助项目
【分类号】：TG456.7

【共引文献】