Effect of post weld heat treatment on the microstructure and properties of Laser-TIG hybrid welded joints for CLAM steel

•The welded joints of CLAM steel had been prepared by Laser-TIG hybrid welding.•The properties were investigated for both conditions of as-welded and PWHT.•The transient heat loads by laser beam were tested for joints of as-welded and PWHT.•PWHT at 760 °C for 0.5 h exhibited better performance of resistance to oxidation.