Investigation on Laser Beam Weldability of AISI 304L Plates Based on Thermal Field Simulation by Experimentally-Fitted Analytical Modeling

Abstract The objective of the work is to present a new approach simulation thermal field in laser beam welding, based on an experimentally-fitted analytical model, applied investigate weldability AISI 304L austenitic steel. Reference made welding trial single pass two 10 mm thick butt-positioned plates. Welding was performed under keyhole full penetration mode, which characteristic high-power beam, and simulated by model multipoint-line source system fitted experimental fusion zone profile. simulate effects speed changes fields cooling rates, order determine how they can affect weld composition, solidification mode possible formation sensitized heat affected zone. A limit value speed, allows without lack fusion, identified. For all speeds considered, be excluded. contribution rate, not significant near axis, results determinant at boundary fused with base metal. combined choice filler material cases gives rise primary ferrite modes, affects content residual ferrite, must balanced enhance resistance cracking, avoiding adverse due too high contents. As conclusion, proves valid support investigating effects, result from setup parameters, metal-filler system. Graphic