Manufacturing & Design Today

Hot Gas Convection Welding — Another New Innovative Technology that Bielomatik Offers!

Article Courtesy of bielomatik

Along with the Turn2Weld LasIr two-step laser process on the show floor and live at our Booth #3743, you will be able to view all the current welding technologies we offer with our Touchscreen Monitor Display.  

Hot Gas Welding

A particle-free welding of geometrically complex components. When geometrically complex components are made of heavy-duty thermoplastics, such as PA66, PPA, or PPS, need to be welded particle-free, hot gas convection welding is an interesting alternative to the established infrared welding.

By contactless heating and by means of a hot flow of air or compressed gas that allows technical plastics to be heated cleanly. In contrast to IR welding, the color of the material plays no role.  The absorption properties of the plastic is irrelevant for the convection. Hot gas welding is based on a tool concept in which process gas gets warm through a heat exchanger and is led along the contours to the welding rib. The use of process gas benefits this welding technique by allowing a minimal effect of thermal oxidative damage to the plastic during heating. The finely adjustable zone and nozzle concept of the hot gas tools allow for individual customization to the component that is to be welded.

The main advantage over infrared welding is that areas such as component walls or screw bosses, that are hard to reach, and which IR radiators cannot be passed over, can be reliably heated. Even T-joints, internal ribs, and narrow angles can be handled better than with the established infrared welding technologies using glass tube or metal foil radiators. This technology can be combined with the IR camera monitoring developed by bielomatik which offers inline monitoring of the heating result in order to enhance process reliability.

Features of the Hot Gas Welding System

  • The tooling can be divided into individual zones based on welding ribs to enable better heat coordination.
  • Separately adjustable preparation of flow zones on each side of the component (top/bottom).
  • Inline-Process Control by bielomatik Thermovision Software.

Potential Applications

  • Engine compartment components made of PA66-GF, PPA, PPS, PEEK, and other technical and heavy-duty thermoplastics.
  • Components for fluid technology applications, e.g., hot water.
  • Components with highest cleanliness requirements, e.g., rear lamps.

For more information on this technology or all that we have to offer, see us at our Booth #3743. Get in touch with bielomatik online at www.bielomatik.us, calling 248-446-9910, or contacting 55397 Lyon Industrial Drive, New Hudson, MI, 48165.

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