Welding process for thermal strength steel 15CrMo

The invention provides a thermal strength steel 15CrMo welding process, and belongs to the technical field of welding. The method comprises the following steps: polishing the metal surface of the welding groove to remove oxidation color, and cleaning with ethanol or propyl alcohol to remove grease and moisture; preheating to 150 DEG C; argon arc welding backing welding is carried out, GTAW is adopted as a welding method, TIG-1CM with the diameter phi being 2.0 mm is adopted as a welding material, and one-time forming is carried out as much as possible in the welding process; the argon arc welding bottoming is subjected to dye penetrant inspection, and whether cracks exist or not is checked; filling cover surface welding is conducted on the second layer and other layers, SMAW is adopted in the welding method, TR-307 with the diameter phi being 4.0 mm is adopted as a welding material, and welding is conducted in a multi-layer and multi-pass mode during welding; and carrying out post-heat treatment, heating to 6