The surface of 1Cr5Mo heat-resistant steel welded joint was treated with CO2 laser. the microstructure and grain size grades of welded joints before and after laser heat treatment (LHT) were analyzed with 4XC type optical microscope (OM). and the distribution of residual stress and retained austenite content in the surface of the welded joints were measured with X-ray diffraction (XRD... https://www.ngetikin.com/