6 Steps to Weld Plastic Like a Pro

  1. Identify the type of plastic you’re going to weld. Some plastics like polypropylene (used in car bumpers) can be welded only with a polypropylene rod. This is why you need to know what type of plastic you’re dealing with. Usually, they’re labeled with identification codes. If they aren’t, however, you’ll need to perform a welding test. The easiest and fastest method is to use the Techspan Rod Test Kit.

  2. Once you’ve identified the plastic, prepare the tools you’ll need; that includes a piece of metal. It should include a handle which won’t conduct heat. You’ll need to heat up the metal in the flame so be sure you’re wearing gloves that are thick enough to protect your hand and prevent it from becoming too hot.

  3. Heat the metal for more or less 10 seconds. Doing this will make the metal adequately hot for welding. This will make the welding easier.

  4. Now, it’s time to make a few welds. To perform this step, make sure the edges of the plastic are held together. A few tack welds will ensure that both sides of the split are kept together. Next, get the hot metal and drag it from the side of the split to another. You’ll now observe that the plastic will melt as the hot blade touches it. This time it will be possible to pull it across the split. Remember not to go deep into the metal, just allow the plastic’s surface to melt. The metal will cool after a while, so you will need to heat it in a flame again for 10 seconds or so.

  5. Now that the tack welds are done, it’s high time to close the split using broader strokes up and down the split. It’s a huge mistake to allow the metal to sink into the plastic. It will only make it weak and thin. Just combine the surfaces of the two sides and that’s it. Move on.

  6. Do the previous step again for the other side to make sure the weld is strong enough. And voila! You’ve welded plastic like a pro.