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molar
Actually the weilder that the factory guy used on my boat was kinda like that, but larger.
it had a metal tip about 2 inches long rounded on the end that heated up to melt the existing plastic that you touch it agains. the compressor pushed the plastic rod through the weilder and it melted as it came through the tip so that it was forcing melted plastic into the melted existing plastic where you wanted to weild. it was pretty neat and fairly straight forward.
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