高温合金/不锈钢异种材料T型接头激光穿透焊工艺研究

针对飞行器发动机水冷壁结构,进行了GH3128/06Cr19Ni10异种材料T型接头激光穿透焊试验,主要研究了焊接参数对焊缝成形和焊接裂纹的影响规律,分析了焊接裂纹形成原因,得到了较合理的焊接工艺区间。结果表明,对于GH3128/06Cr19Ni10异种材料T型接头激光穿透焊,连续焊比脉冲焊更易实现稳定焊接,获得良好焊缝成形。焊接裂纹是接头主要缺陷裂纹都在高温合金一侧产生,控制激光功率、保证对中可降低裂纹产生概率。焊接接头的另一种缺陷是表面下塌,保证间隙小于0.2mm可抑制下塌缺陷的产生。对由41条焊缝组成的模拟件进行了10MPa,5min水压测试,每条焊缝都满足要求。

Dissimilar Metals Combination of Superalloy/Stainless Steel in T-Shape by Laser Penetration Welding

GH3128 and 06Cr19Ni10 which are mainly used in water wall of flight vehicle engine are joined together by laser penetration welding. The relationships between welding parameters and welding appearance and cracks are mainly researched. The reason of weld cracks is analyzed. A appropriate welding craft is summarized. The following conclusions are obtained. The continuous laser welding is better than pulse laser welding in terms of welding appearance and welding process stability. If the gap between the two metals is too big, the surface of the welding seam will collapse. The GH3128 plate may crack if the laser power is too high, or if the laser beam deviate from the centre. The welded specimen which contains 41 weld seams preform well at the hydrostatic test (10 MPa, 5 min).