A method for forming heat exchanger plates comprises formation of a fluid
flow channel along the edges of a sheet metal strip or blank, and
formation of a pair of raised end bosses. The raised end bosses are
elongated in the longitudinal dimension and are formed within the final
width dimension of the plate so as to avoid the need for trimming of
excess material along the edges of the plate. The method generates less
scrap than prior art processes using progressive stamping, and also
permits variation of the plate lengths.
