Posted by Janicholson on June 07, 2020 at 09:01:19 from (24.240.46.228):
In Reply to: Plastic Welding posted by JimS on June 07, 2020 at 08:35:21:
90% of the bulk tanks are polyethylene. It is probably the easiest material to weld there is. The process is heat dependent. Too much, and the plastic changes structure, blackens and oxidizes, loosing strength. too little and the material really is not joined. Deep root welding it important in this case to prevent weld failure. Cutting a groove with a sharp utility knife if the material is 1/4" thick, or thicker. is needed to assure depth of weld penetration. The filler rod is used to both stir and fill at the same time. The plastic stays hot a long time, and will burn, and stick to your skin making a real serious 3rd degree burn, don't go there. Practice on similar material if you can, and be patient. It is no harder than working with a oxy acetylene setup welding steel. The tool is almost always plunged into the depth of the weld . Watch some YouTube on it before starting. Make sure the stress that caused the cracking is eliminated, the weld will not likely be stronger than the original. Once you develop some heat control, and fill stability go at it. Jim
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