Section bar for heat dissipator, heat dissipator and section bar assembling method for heat dissipator

The invention provides a section bar for a heating heat dissipator, a seamless steel and aluminum corrosion-resistant heat dissipator and a section bar assembling method for the heating heat dissipator, relates to the technical field of heating heat dissipators, and solves the technical problem the heat dissipating efficiency is affected as an inner water pipe of an existing heat dissipator is inserted into an outer section bar and a gap exists between the inner water pipe and the outer section bar. The section bar for the heating heat dissipator comprises a water pipe mounting hole and a heatdissipating fin arranged on the outer side of the wall of the water pipe mounting hole, wherein at least part of section of the inner water pipe can penetrate into and can be inserted into the waterpipe mounting hole, a convex part exists on the wall of the water pipe mounting hole, and the inner side of the convex part is concave to form a cissing process seam, so that the size of the cissing process seam can be reduced