#molecular fusion

• Self-welding — The act of self-welding and its result; an autonomous physical, chemical, or metallurgical process through which two identical or compatible metallic or polymeric surfaces join tightly, achieving a continuous structural bond under the action of heat, high pressure, or internal molecular reactions without the addition of external filler material or manual welding intervention.
• Self-weld — A continuous structural joint obtained automatically or spontaneously between two parts or materials through the self-welding process; the bead or zone of molecular fusion resulting from an autonomous thermal or mechanical assembly, characterized by high mechanical strength and the absence of traces of external filler material.