| 摘要 |
A preheating device intended for use in aluminothermic welding operations consists of a housing (12), which receives a nozzle (8) and is provided with a liquid gas feed (9), and a vaporizer (10), which is arranged downstream of the nozzle in the direction of flow, wherein the housing (12) has on its end facing a casting mould a combustion space, which ends in an outflow opening (11) for combustion gases and receives the nozzle, and a portion (22), which encloses the outflow opening (11) and can be inserted into an opening formed in the upper side of the casting mould, and wherein the vaporizer (10) is located between the outflow opening (11) and the nozzle (8), thereby being in heat exchange with the combustion gases. |
