Welding - Joining thermoplastic
pieces by one of several heat-softening processes. In
hot-gas welding, the material is heated by a jet of
hot air or inert gas directed from a welding "torch"
onto the area of contact of the surfaces which are being
welded. Welding operations to which this method is applied
normally require the use of a filler rod. In Spin-Welding
the heat is generated by friction. Welding also includes
heat sealing and the terms are synonymous in some foreign
countries including Britain.
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