Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Miscellaneous and Off Topic Forums > Off Topic Discussions


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Nice guy eddie
 
speeder's Avatar
 
Join Date: Jul 2001
Location: los angeles, CA.
Posts: 33,696
Garage
Plastic welding:

Anyone here have any experience welding plastic? Maybe I'm just imagining this but I could swear that I've seen thick plastic welded just like metal(?)

Here is the deal; the fresh water tank in my RV has a broken off tube where the water fill hose connects. It's a clean break. I was thinking about cutting an access panel in the top of tank, fitting a new tube fitting from inside w gaskets and then closing back up the panel. Since it would be on top, leakage from the access panel is not a big concern but it still needs to be tight to keep contaminants out, etc.

I suppose that I could just epoxy it back together but if it can be welded, it seems like that would be better. I'll get photos tomorrow to better illustrate it, rig is in the shop right now getting windshield sealed, (again).

Thanks!

__________________
Denis
"It was either Voltaire or Charlie Sheen who said, 'We are born alone. We live alone. We die alone. And anything in between that can give us the illusion that we're not, we cling to.'" -
-- Gabriel byrne
Old 10-13-2020, 02:04 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Used User
 
Zeke's Avatar
 
Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 32,715
Some plastics weld and some don't. Your water tank is likely on the list of weldable plastics. But first you must determine the nature of the tank so you can use the correct filler rod.
__________________
My FB page: www.facebook.com/oddjobfix
Antique and Collectibles Repair and Restoration
On YouTube at "oddjobfix"
Old 10-13-2020, 02:10 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Nice guy eddie
 
speeder's Avatar
 
Join Date: Jul 2001
Location: los angeles, CA.
Posts: 33,696
Garage
Thanks. Picture that thick white, semi-transparent stuff. That plastic.
__________________
Denis
"It was either Voltaire or Charlie Sheen who said, 'We are born alone. We live alone. We die alone. And anything in between that can give us the illusion that we're not, we cling to.'" -
-- Gabriel byrne
Old 10-13-2020, 02:15 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered
 
Join Date: Mar 2003
Location: SW Cheese Country
Posts: 10,828
Garage
Call a local body shop. Good ones have a welder.
__________________
Brent
The X15 was the only aircraft I flew where I was glad the engine quit. - Milt Thompson.

"Don't get so caught up in your right to dissent that you forget your obligation to contribute." Mrs. James to her son Chappie.
Old 10-13-2020, 02:15 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered
 
908/930's Avatar
 
Join Date: May 2012
Location: BC, Canada
Posts: 512
Garage
As Zeke said, need to know material, probably made from polypropylene or polyethylene? I have used a hot air welder on acrylics, getting the temp right to not get bubbles in the weld area was hard part if I remember, that was some time ago, the polypropylene or polyethylene should not have that problem. How thick is the tank?

I do not think that epoxy will work.
__________________
87 930, 17 BMW 320, 04 BMW 530i, 87 BMW 535i, 11 2500HD

Past/ BMW's, 71 2002, 81 320i, 77 630csi, 81 528i, 84 533i, 89 535I. 81 Toy Hilux 4wd, 77 Toy FJ40, 72 Kawa H1 500, 85 Yam V-max, 95 Kawa ZX-11.
Old 10-13-2020, 02:21 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
New kid in town
 
71T Targa's Avatar
 
Join Date: Nov 2001
Posts: 2,232
I used this process to repair a huge crack in my HDPE canoe. It's not pretty, but it's solid and water tight. I used the HF plastic welder and a mini torch to help keep things at temp.

__________________
I wish I still had 9111113443...
Old 10-13-2020, 02:26 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
Brew Master
 
cabmando's Avatar
 
Join Date: Jul 2013
Location: right behind you... don't look
Posts: 19,909
Garage
Just hit it with JB and call it a day. Bout the only thing JB won't stick to is that stuff made with soybean oil. Nothing sticks to that.
__________________
Nick

Last edited by cabmando; 10-13-2020 at 02:28 PM..
Old 10-13-2020, 02:26 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Get off my lawn!
 
GH85Carrera's Avatar
 
Join Date: Nov 2007
Location: Oklahoma
Posts: 62,709
Garage
Yep, I have had it done.

The film processors at we used for years were made of a grey plastic that had a soapy feel, and no glue of any sort would stick to it. We had to hire a guy to come plastic weld one tank back up after a former employee managed to burn the building down when he left a 1,000 watt heater unattended.

It was much like metal welding, just different material.
__________________
Glen
44 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
Old 10-13-2020, 02:33 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Registered
 
Join Date: Feb 2002
Location: West
Posts: 6,381
Garage
I had a leak in the fresh tank on my travel trailer. Really odd sized tank that I could not find a replacement for.

Look up "spin welding", I found a local place that could put a patch in. Most RV tanks come without the hoses points attached as they vary by model. If you have the tank measurements I can send you the name of the place my tank was made, they sell a TON of replacements just not one for mine.
Old 10-13-2020, 02:36 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
Brew Master
 
cabmando's Avatar
 
Join Date: Jul 2013
Location: right behind you... don't look
Posts: 19,909
Garage
Just get in and drive it down here. I'll take it to my nephew. He'll fix it. They weld that thickness on a regular basis. But I'm not givin ya any of my beer!
__________________
Nick
Old 10-13-2020, 02:46 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Nice guy eddie
 
speeder's Avatar
 
Join Date: Jul 2001
Location: los angeles, CA.
Posts: 33,696
Garage
Thanks, guys. I'll get pictures up tomorrow and it will all make more sense, including to me.
__________________
Denis
"It was either Voltaire or Charlie Sheen who said, 'We are born alone. We live alone. We die alone. And anything in between that can give us the illusion that we're not, we cling to.'" -
-- Gabriel byrne
Old 10-13-2020, 02:53 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #11 (permalink)
Registered
 
petrolhead611's Avatar
 
Join Date: Jun 2008
Location: LEEDS ,UK
Posts: 2,091
Send a message via AIM to petrolhead611
I have welded loads of PVC as a cover maker an polypropelene, to repair plastic Wheely bins(dumpsters) There are two methods that I have used. For PVC you have a choice of using PVC cement on a lap joint using a pressure roller thereafter ( usually used for joining plumbing fittings and requires no real skill: or 2 KW hot air lap welding using a hot air gun( make sure it has a variable temperature control) blowing the hot air between the two sheets and rolling the seam with a polyurethane pressure roller. For polypropolene use the hot air gun and some polypropelene scrap as a filler rod ( get everything up to temperature and do a few tack welds to hold the patch in place the seam weld.
__________________
1986 924S bought new. Now used for AutoX and street.
Chipped, throttle cam, highflow filter in original airbox/snorkel, 14mm rear sway
Hyundai Ioniq hybrid daily driver
Vindicator Vulcan V8 spyder, street legal sports racing car
(300hp,1400 lbs kerb weight) used for sprints on circuits, and hillclimbs
Old 10-13-2020, 03:17 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #12 (permalink)
weekend wOrrier
 
Join Date: May 2011
Posts: 3,563
Your truly washed a pair of pants once with some sharp screws in them, which promptly fell out of my pants, got caught in the small holes in the bottom of the machine, and cut through the washing machine tub while it spun.

This tub was the "non bondable" plastic. I disassembled the plastic tub to gain access, and used a simple soldering iron like a hot knife to weld it. It's held for about 6-8 years so far. The trick was to treat the plastic like welding a bead, meaning both sides had to melt into one another to get a good bond. Once cold, it was still flexible. Ithink I even added in some extra plastic like a welding stick.

(I'm guessing it's like the video posted above- I didn't watch it yet..)

Last edited by LEAKYSEALS951; 10-13-2020 at 03:44 PM..
Old 10-13-2020, 03:36 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #13 (permalink)
Registered
 
Bill Douglas's Avatar
 
Join Date: Jun 2000
Location: bottom left corner of the world
Posts: 15,166
Denis I've had some luck recently with a plastic fix a bit like yours.

I used a soldering iron - not too hot, and carefully melted the plastic from left to right etc over the break. It worked quite well. So it's hot enough to melt it, but not so hot as to burn it. then maybe some araldite over the join to water proof it.
__________________
see www.lyallbaybeach.co.nz
Old 10-13-2020, 03:42 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #14 (permalink)
83 911 Production Cab #10
 
JJ 911SC's Avatar
 
Join Date: Jun 2009
Location: Ottawa, Ontario, Canada
Posts: 11,043
Garage
Sadly it's still in the original wrapper, circa 2015...



__________________
Who Will Live... Will See

83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats, Going SOK Super Charger
Old 10-13-2020, 04:00 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #15 (permalink)
Platinum Member
 
dad911's Avatar
 
Join Date: Jul 2001
Location: Leave the gun. Take the cannoli.
Posts: 15,121
I fixed a polypropylene water tank with scraps and a propane torch. Pure rube-Goldberg luck.

Also patched one with a square of aluminum, gasket, and stainless bolts.

Quote:
Originally Posted by speeder View Post
.......
Here is the deal; the fresh water tank in my RV has a broken off tube where the water fill hose connects. It's a clean break. .......
If it is a clean break, can you use a bulkhead fitting and adapt the fitting to your filler hose?



Or a gasket and a flange fitting:

__________________
For Sale: 964 parts- rollcage, Fiske wheels
Old 10-13-2020, 04:03 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #16 (permalink)
You do not have permissi
 
john70t's Avatar
 
Join Date: Aug 2001
Location: midwest
Posts: 28,489
As corny as it seems, this infomercial product looks like it works. Not sure about the penetration.
(Dental type UV-cured bond glue.)

Bondic Review #2: Bondic plastic weld review

(skip to about 12:00 where he fixes a plastic tank full of water in only seconds)
__________________
Meanwhile other things are still happening.

Last edited by john70t; 10-13-2020 at 04:17 PM..
Old 10-13-2020, 04:08 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #17 (permalink)
Registered
 
Join Date: Apr 2005
Location: In the wind...
Posts: 28,149
You gotta identify the plastic first. Some don't play nice with either welding or epoxies.
Old 10-13-2020, 04:13 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #18 (permalink)
The Mighty Pieholio
 
Bob Kontak's Avatar
 
Join Date: Nov 2007
Location: North Canton, Ohio
Posts: 17,279
Garage
Quote:
Originally Posted by 71T Targa View Post
I used the HF plastic welder and a mini torch to help keep things at temp.
I've had very good luck with the HF plastic welder.

The mini-torch is a great idea as the neck of the heat pad eventually bends backwards when you try to put pressure on it to drive more heat into the work.
__________________
1981 911SC Targa
Old 10-13-2020, 04:32 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #19 (permalink)
Registered
 
MBAtarga's Avatar
 
Join Date: Jul 2001
Location: Lawrenceville GA 30045
Posts: 5,781
I've seen video (very likely youtube) of folks using the cheapo horrible freight tarp fabrics as the "raw" material to weld broken plastic objects.

__________________
Mark

'83 SC Targa - since 5/5/2001
'06 911 S Aerokit - from 5/2/2016 to 11/14/2018
Old 10-13-2020, 05:44 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #20 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 03:25 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2020 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.