Welded intake device for an internal combustion engine

An intake device for an internal combustion engine, comprising an inlet, cylinder-side outlets for combustion air, and duct structures which form communicating connections between said inlet and said outlets, wherein the duct structures are formed at least partially by at least two shells welded together along a partition line under application of a welding pressure force;

• said partition line being defined by mating joint surfaces on the shells which at least in partial regions are oriented at an angle of less than 90° relative to said welding pressure force;
• wherein the application of the welding pressure force on the sum of said partial regions generates a first transverse force Q1 relative to said welding pressure force during welding of the intake device, and wherein additional mating surfaces are arranged within the shells which during application of the welding pressure force create a second transverse force Q2 relative to said welding pressure force, said second transverse force Q2 at least partially offsetting said first transverse force.