Fibre Laser Welding of HY-80 Steel: Procedure Development and Testing

摘要

The metallurgical and mechanical properties of a series of autogeous fibre laser welded joints were carried out. These welds were made between two butt joined slices of 5 mm thick HY-80 material over a range of heat inputs extending from 75 to 240 J/mm. Apart from the increasing width of the fusion and heat affected zones with increased heat input, the metallurgical structures of the welds were similar. In all cases, the fusion zone of the weld was found to have the consistent hardness of an untempered martensite. Mechanical characterization of the welds showed that while the tensile strength exceeded the base metal requirements, under impact loading conditions the fusion zone failed in a brittle manner.