A metal truss system comprising a pair of chord members of generally U-shaped cross-sectional configuration is joined together by a web formed of a single continuous piece having a wave shape. The apexes of the web are adapted to be received in each chord. The legs of the chords have inwardly recessed portions to form a narrowed throat portion, which provides a stop against which the apex of the web abuts. The resulting positioning of the web apex presents a maximum surface area for welding the web to the chord member. This enables an optimum amount of welding, while minimizing the weakening of the metal being welded. The configuration of the chords and web permits rapid fabrication of the truss.