The invention relates in particular to a mold (M) for aluminum thermit welding of metal rails (1), the mold comprising the head (10), the vertical (11) and the legs (12) of this rail (1). Comprising at least two essentially identical parts or shells (4) adapted to be temporarily assembled opposite one another on both sides of the rail (1) for enclosing, each part or shell (4) Open into an internal cavity (44) bounded by walls (45, 46, 48) configured to surround the head (10), vertical (11) and legs (12) of the rail (1) , With an upper opening (43), the internal cavity (44), with the exception of the remainder of the head (10) and the underside of the legs (12), the vertical (11), the legs (12) and the head A wall (451) configured to surround the lower surface of (10) 46, 48) with respect to only, characterized in that it comprises a compressible sealing film (5).
展开▼
