the invention relates to a thermoplastic panel or piece having a resilient welded portion . the panel or piece of the present invention may be used in a variety of applications such as to provide sealing ends on thermoplastic panels or to create resiliently closable passages in thermoplastic panels through which wires and other objects may be passed while maintaining an even surface appearance of the baseboard panel . other uses include attaching one or more thermoplastic pieces together . the invention also includes a method for making the subject thermoplastic panel or piece .