哈氏合金激光焊接技术及其焊接性研究

Hastelloy is one kind of alloys which has many advantages, such as better corrosion resistance, resistance to high temperature and high pressure, etc. Because of high strength and toughness of this series of alloys, the defects such as thermal cracks, porosity, intergranular corrosion will occur through the analysis of the welding performance in the welding process. In order to overcome these defects, we should adopt reasonable welding technology to ensure a good welding quality. In this paper, orthogonal test design method will be used to design the orthogonal table which according to the influence factors in the welding process and the level of each influence factor, find out each combination level of the welding process, and according to this combination level a robot laser welding system will be usde we research on Hastelloy C-276 alloy thin-walled tube which just has 0.8 mm, use robot laser welding system to perform a great deal of experiment. By observing the surface topography of the welding seam joint, thus verify the feasibility of the welding method that use robot laser welding system to weld this material, then do the tensile test about the specimen which has better weld morphology, and finally optimize the influence factors in the welding process to find the most reasonable welding plan, providing certain technical support to the application of hastelloy alloy.