Patent ID: 8712226

Claim:
A welding tip for welding plastic material, the welding tip comprising: a base that includes an attachment portion and an output end, the attachment portion being adapted to engage a heat gun and the output end being configured to direct a flow of hot air; a welding rod feed section secured to the base and having an opening that guides a plastic welding rod through the opening so that the plastic welding rod intersects the flow of hot air when the heat gun is heated, the welding rod feed section having a generally triangularly-shaped cross-section throughout its extent, and the opening having a v-shaped cross section; and a flange secured to the welding rod feed section and extending at an angle relative to the welding rod feed section, the flange having a convex surface facing the opening in the welding rod feed section and configured to apply pressure to the plastic welding rod as the plastic welding rod is heated and positioned in and along a joint between surfaces to be welded, the plastic welding rod having a generally triangular cross-sectional profile that is complementary to the generally triangularly-shaped cross-section of the welding rod feed section, wherein the generally triangular cross-sectional profile of the plastic welding rod includes an intersection from which a first and a second side wall extend to a hypotenuse wall opposite the intersection, the hypotenuse wall having opposed first and second generally planar end portions adjacent the first and second side walls and having an incurvature portion between the first and second end portions, and wherein the incurvature portion presents a concave surface that generally complements the flange's convex surface in order to facilitate a pressing action between the surfaces during a welding event.