Heat treatment process after welding for a bain splice welding connection

摘要

The invention relates to a heat treatment method after welding for a bainstitch welding connection, comprising the following steps: A. performing a first cooling for the weld joint obtained by welding at 1500-1600 ° C to 150-250 ° C, the first cooling process being a natural cooling in the air; B. heating the weld joint to 880-960 ° C by means of a medium frequency induction profile electric heating coil and / or an oxygen-acetylene flame profile heating; C. carrying out a second cooling for the welding connection, stopping with the second cooling when cooling to 180-250 ° C, then performing a third cooling to the room temperature of 5-40 ° C; wherein the method of the second cooling is a rapid cooling with a cooling medium while the cooling start temperature of the second cooling is more than 800 ° C; and wherein the method of the third cooling is a natural cooling in the air.