Pulsed Nd:YAG laser beam welding of UNS S32205 duplex stainless steel

• Grant number: 12/12838-6
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): September 01, 2012
• Effective date (End): August 31, 2013
• Field of knowledge: Engineering - Mechanical Engineering - Manufacturing Processes
• Principal Investigator: Vicente Afonso Ventrella
• Grantee: Bruno Crepaldi Alves
• Host Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil

Abstract

This work of undergraduate research involves the study of the influence of welding pulse energy Nd: YAG laser on the balance of phase ferrite/austenite duplex stainless steel UNS S32205. The laser weld beads are obtained with varying intensity of the laser beam 10-60 W/cm2, maintaining the pulse energy equal to 6.0 Joules, the temporal width of 4, 6, 8, and 10 ms, and depths of focus 1.0, 1.5, and 2.0 mm below the workpiece surface. The results obtained from this study suggested will therefore be compared with experimental results available in the literature, which are generated by other welding processes. Thus, the role of laser control of austenite and ferrite phases will be investigated, where it is shown the feasibility of using the welding process by pulsed laser Nd: YAG laser in this control phase in the weld metal and thus guaranteeing a good toughness and good resistance to corrosion of the weld. The contribution required by this project should be Undergraduate Research in order to achieve greater dissemination of information about the application of a solid-state laser source, pulsed Nd: YAG laser welding of duplex stainless steel UNS S32205. The project has great potential for innovation in the field of lasers, through the application of pulsed solid-state laser (Nd: YAG) in a duplex stainless union, an important constituent of the metallic components of the industries of Petroleum and Natural Gas. The results could help in reducing losses caused by premature failure of components, but mainly to reduce the risk of environmental accidents and operations which may be caused by these failures. (AU)