Hybrid Laser-arc Welding of 17-4 PH Martensitic Stainless Steel

摘要: PH stainless steel has wide applications in severe working conditions due to its combination of good corrosion resistance and high strength. The weldability 17-4 is challenging. In this work, hybrid laser-arc welding was developed weld steel. This method chosen based on advantages, such as deep penetration, less filler materials, speed. plates with a thickness 19 mm were successfully welded single pass. During the welding, immensely susceptible porosity solidification cracking. avoided by using nitrogen shielding gas. stabilized keyhole inhibited formation bubbles during welding. Solidification cracking easily occurred along centerline at root welds. microstructural evolution susceptibility investigated remove these cracks. results showed that mode material changed cooling rate weld. rapid caused transformation from ferrite austenite stage. likely formed result cracking-susceptible microstructure depth/width ratio led tensile stress concentration. Furthermore, prevented preheating base metal. It found slowed weld, ferrite-to-austenite stage suppressed. Delta observed bead well no optimizing temperature.