Apparatus and method for manufacturing a composite part to provide smooth join surfaces of the composite part

A composite-part manufacturing method comprising:

• placing a bladder against a tool comprising a first tool radius portion elongating between a first trough surface and a first major surface of the tool and a second tool radius portion elongating between a second trough surface and a second major surface of the tool;
• placing a first radius filler in vicinity of the first tool radius portion;
• placing a second radius filler in vicinity of the second tool radius portion;
• applying a peel-away ply over at least a portion of the bladder, the first radius filler, the second radius filler, the first major surface, and the second major surface;
• applying at least one material layer on the peel-away ply;
• and
• after the at least one material layer has been applied on the peel-away ply, moving the peel-away ply away from the bladder, the first major surface and the second major surface, thereby moving the first radius filler along with the peel-away ply away from the first tool radius portion and the second radius filler along with the peel-away ply away from the second tool radius portion to form a composite part having a smooth join surface in vicinity of the first tool radius portion and the second tool radius portion.