After the suggestion of a Hot air welder I just had to look it up. Here are some videos on their use. Plastic ‘welding’ videos
In a sense, it looks like a focused miniature heat gun using HDPE strips to bond two pieces or for repairs. this looks quite useful in addition to using adhesives.
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There’s a similar process in certain sewing applications where a piece of plastic tape is run between two similar fabrics, heated, then rolled together. Any waterproof bag or zodiac boat uses this process.
Check out plastic pressure Welding - it uses the friction of two pieces moving against each other to weld together.
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