CO2 Laser Welding Characteristics of 800 MPa Class TRIP Steel

摘要: Basic characteristics of CO2 laser welded 800 MPa class TRIP steel such as defects, microstructure, mechanical properties and formability was investigated. Bead-on-plate welding carried out under various power, speed shield gas. Porosity fraction reduced with increasing the using Ar-He mixed gas compared to Ar The maximum hardness obtained at weld metal well HAZ near metal. value same regardless nearly equal that water quenched raw In perpendicular tensile test axis, joints produced optimum condition were fractured base property a parallel test, strength higher than metal, but elongation found be lower because crack initiated in bead levels corresponding propagated direction. Elongation further improved low power or Ar+He high