Metal wire braid

Provided is a metal weir braid. A braid is a belt-shaped object formed by squeezing a hollow cylinder-shaped metal net. The belt-shaped object is in a square column shape. The cross section of the braid is in a rectangular shape. One side wall of the square column shape concaves inwards. The braid winds on an inner pipe of an exhaust pipe so as to form a crash pad. The braid is fixedly connected with the inner pipe of the exhaust pipe by welding. The welding is spot welding. The metal wire braid is formed by squeezing and molding heat-resisting thin metal wires which are knitted into a cylinder shape through plain stitch to a thin and long shape so as to enable the metal weir braid to form a lightly concave continuous cross section along the length direction of the metal wire braid, and possesses good elasticity. When the metal wire braid is welded in a spot welding mode, the welding spots are distributed along a groove and easy to locate. When assembled with the inner pipe of the exhaust pipe in a spot weldi