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#1
04-16-2014, 12:50 PM
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Has anyone here ever used a plastic welder?
I have a very heavy plastic pressurized overflow tank+ rad cap on the 1986 G30 6.2L diesel. It cracked and I bought a new one. I would like to save the old one by repairing it along the seam where it cracked.
Anyone have any experience with a plastic welder? A guy on another forum said it worked for him but gave no details. Thanks!
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Strelnik Invest in America: Buy a Congressman! 1950 170SD 1951 Citroen 11BN 1953 Citroen 11BNF limo 1953 220a project 1959 180D 1960 190D 1960 Borgward Isabella TS 2dr 1983 240D daily driver 1983 380SL 1990 350SDL daily driver alt 3 x Citroen DS21M, down from 5 3 x Citroen 2CV, down from 6 
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#2
04-16-2014, 01:04 PM
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I've watched a local auto body shop repair bumper covers and side moldings with a pro plastic welder. We talked about the home garage kits and the opinion was that they are "okay" for small cracks but you have to be patient since they don't get very hot and have the right sticks to match the material being welded.
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#3
04-16-2014, 01:08 PM
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I have used a HF unit on occasion. It works. Practice on scraps. Use scraps from the part you are repairing if you can't positively match a rod. Get one from a junkyard to practice on and use for scraps.
DON'T breath the fumes. Three puddles make one puddle for a good weld. If you don't know why it cracked it might never be trustworthy.
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#4
04-16-2014, 01:19 PM
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Yes I have plastic welded. I've never had success with my HF version. However, years ago I bought a plastic welder at a garage sale specifically sold for welding radiators, tanks etc. It looks like an electric soldering iron with a foot. The foot has a vertical tube attached about and inch high. You feed rods of plastic thru the tube where it gets heated, liquifies and flows out the bottom. I've welded quite a few things with it over the years. You have to match the plastics. The welding 'rod' is sold in rolls of different formulations. I mainly used it for welding plastic nubs on plastic barrels so I could install handles for carrying them when canoeing. I also repaired a few broked things over the years.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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