No matter which plastic assembly operation you choose, proper selection and design of component materials (i.e. stakes, joints, etc.) are critical to achieve strong fit-for-purpose welds. We welcome you to CONTACT US for additional guidance on the design best for you.
Whether used as a standalone, or with other automated technologies to meet aggressive part volume quotas, PAS heat staking equipment offers the highest machine control levels in the industry. This includes sophisticated systems with Z-axis servo control for precise, rapid and repeatable execution. The results are cosmetically exceptional bonds that are indistinguishable from the original mold.
Pictured: Hollow Stake: A hollow boss produces a large, strong head without having to melt a large amount of material.
Perhaps the most critical facet of ultrasonic welding is joint design (the configuration of two mating surfaces). It should be considered when the parts to be welded are still in the design stage, and incorporated into the molded parts. There are a variety of joint designs, each with specific features and advantages. Their selection is determined by such factors as type of plastic, part geometry, weld requirements, machining and molding capabilities, and cosmetic appearance.
Pictured: Scarf Joint – High-Strength hermetic seals on parts with circular or oval designs, especially with crystalline resins.
Spin Welding Joint Design is critical for a proper spin weld. Spin welding is used to join two plastic parts which are spherical or cylindrical in shape. Frictional heat is generated at the mating surface (joint) by spinning one part (upper) against a fixtured (lower) part, thus welding the assembly together. Spin welding is a fast process that works well with large and small diameter parts as well as a broad range of thermoplastic resins.
Pictured: Flanged Shear Joint Design / Sheat Joint Design – Both offer a clearance of – 0.005 and a – 0.050 radius.