Hot gas welding uses a hot dry gas to simultaneously melt the surfaces of the
parts to be joined and a plastic welding rod. The melt from the welding rod
fills a groove or corner between the two parts and forms a bond after
solidification.
The process is extensively used for assembling large parts produced from
thermoplastic plates, tubes or profiles. Hot gas welding is specially suited
to field assembly and repair, and for prototyping. Injection molded parts are
normally not hot gas welded, as many other more automated and more economic
welding processes are available, mostly with a better controlled weld quality.
Hot gas welding is a slow process.
Hot gas welding
The weld quality is operator dependent and the weld strength is often limited,
due to - residual stresses in the weld zone caused by shrinkage,
- notch effects at the bottom of the groove, - incompatibility of the
welding rod material with the part's material, - dirt particles,
grease, oil or moisture in the weld and - gas inclusions.
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