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ABS or Plastic welding.


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#1 Texas Deere and Horse OFFLINE  

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Posted January 26, 2011 - 03:40 PM

Has anyone done this type of repair before? Where do you get your tools and supplies?
What does the equipment cost and it is very hard to do?
I have several pieces that I want to repair, but don't know anything about it.

Thanks in Advance, Brian

#2 mjodrey OFFLINE  

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Posted January 26, 2011 - 04:24 PM

I have done a little plastic welding.Now what I use is a plastic welding attachment on my Weller soldering gun.It is far from the "proper" plastic welding gear,but it does get the job done IF you don't care what it looks like.

#3 FirefyterEmt OFFLINE  

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Posted January 26, 2011 - 05:28 PM

You can get a set up at Harbor Freight that might be perfect for the work you want to do.

Plastic Welding Kit with Adjustable Temperature
Plastic Welding Kit with Air Motor and Temperature Adjustment

Here are the parts I had a friend weld up with ABS rods using the same basic set up that Harbor Freight sells.
http://gardentractor...ic-repair-3134/

#4 Texas Deere and Horse OFFLINE  

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Posted January 26, 2011 - 05:48 PM

Nice job on you cowl. I'm goin to start playing with my iron on some jd top grill pieces.

Thanks !!

#5 FirefyterEmt OFFLINE  

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Posted January 26, 2011 - 07:54 PM

Oh also, the guy doing the repairs used this thick foil backed tape with some heavy glue. I have seen this stuff before, but can't remember its real use. It's about the thickness of a nickle and maybe 2" wide. He used this to "tape" the break or broken chunk into place. From there he used the top flat edge like a soldering iron to "melt" the plastic in "stitches" to keep it in place before he melted the rod into the crack. This seemed to work nice for him. You can see the "stitches" in my photos after I sanded them down.

#6 Texas Deere and Horse OFFLINE  

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Posted January 26, 2011 - 08:06 PM

You can get a set up at Harbor Freight that might be perfect for the work you want to do.

Plastic Welding Kit with Adjustable Temperature
Plastic Welding Kit with Air Motor and Temperature Adjustment

Here are the parts I had a friend weld up with ABS rods using the same basic set up that Harbor Freight sells.
http://gardentractor...ic-repair-3134/


What does the air motor do for you, is it important?

#7 Alc ONLINE  

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Posted January 26, 2011 - 08:09 PM

I've used the 2 part plastic epoxy and it works pretty well. Can be sanded ,primed & painted . I bought the HF welder that doesn't have a temp.control and it didn't work well at all , It was too hot and how it works is it uses heated compressed air to melt the plastic but it just blew through what I was trying to repair. I then got the HF plastic welder that looks like a soldering iron , that worked better . First time it got used was a plastic radiator tank , been 2 months now and still holding.
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#8 FirefyterEmt OFFLINE  

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Posted January 26, 2011 - 08:24 PM

Again, I have never used one, but I did watch the guy weld mine. It seems to be a knack to getting it just right. Kinda like welding, if you are in thin metal, and you try to run a long bead, it will drop out and leave a hole. Like Alc said, the hot air is directed to a small area to melt the plastic and you feed the rod into the crack. The rod melts into the crack, melts into the plastic part, and hardens to become "one" when you are done. So you need to balance the heat, distance, and speed to what you are working with.
I am not sure how the soldering iron style works, but I would guess that the bond is not as good as the hot air guns because it does not melt the rod in the same. But you may need more "practice" with the hot air one. The cowl repair that was done in my photos was done by a guy who trains people across the entire east coast on plastic welding. You can see that even with his skills, it looks "rough" when done. Although, after it was sanded out it was vastly better looking.

I just remembered another tip he told me when we were trying to figure out what plastic they used. If you weld a rod into the plastic (not at the crack) and then let it cool with the rod sticking out. The one that stays bonded and does not pull off is the correct rod.

Edited by FirefyterEmt, January 26, 2011 - 08:36 PM.

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#9 FirefyterEmt OFFLINE  

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Posted January 26, 2011 - 08:44 PM

YouTube - Bumper Repair with Hot Air Plastic Welder

Here is a really good video about repair. :thumbs:


OR.... here is a rather impressive soldering repair technique. Watch the video and look for the cotter pin!



Edited by FirefyterEmt, January 26, 2011 - 09:01 PM.

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#10 Alc ONLINE  

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Posted January 26, 2011 - 08:48 PM

It would be nice if you could try out a welder before buying it , I wouldn't recommend the HF non adjustable welder at all . The other ones they sell might be better.
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#11 Texas Deere and Horse OFFLINE  

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Posted January 26, 2011 - 09:27 PM

Those are great video's, thanks for the info. Now all I have to do is figure out which welder to buy, LOL

#12 jollygreen OFFLINE  

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Posted March 14, 2011 - 05:02 AM

Brain I will find out today on welding plastic my boss knows about it, buy the way did you come up with a price on my 140 parts that I need Thanks Joe

#13 JoshBrown OFFLINE  

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Posted March 14, 2011 - 04:09 PM

I love the videos!!! I need to add a plastic welder to my tool box!!!

#14 Texas Deere and Horse OFFLINE  

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Posted March 14, 2011 - 04:37 PM

I did a little welding yesterday morning on the girls plastic little red wagon, they overloaded it and almost completely broke the front wheel off. I went under the little seat that covers the storage compartment, and borrowed some plastic for the repair. I just used a soiding iron to make the repair, it went very well, and quite easy to do, I thought. I am feeling good enough about it that I'm going to work on a JD. headlight Assembly tonight or tomorrow. I will post a couple of pictures tonight of wagon repair.




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Edited by Texas Deere and Horse, March 14, 2011 - 09:47 PM.
Added pictures


#15 jhn9840 OFFLINE  

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Posted March 14, 2011 - 09:25 PM

I did a little welding yesterday morning on the girls plastic little red wagon, they overloaded it and almost completely broke the front wheel off. I went under the little seat that covers the storage compartment, and borrowed some plastic for the repair. I just used a soiding iron to make the repair, it went very well, and quite easy to do, I thought. I am feeling good enough about it that I'm going to work on a JD. headlight Assembly tonight or tomorrow. I will post a couple of pictures tonight of wagon repair.


Used the same method to repair a crack to an airbox on a old Mccolloch chain saw. Still working to this day.

jhn9840
John




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