How to Plastic Weld | Eastwood Blog

Welding plastic is similar to steel welding in that one should know what sort of plastic is concerned, its melting level, and easy methods to make a correct weld joint. Keep in mind to that plastic welds will seem comparable steel welds and {that a} grinding and ending course of should be completed earlier than the weld shall be full. That is solely a quick overview of plastic welding and accommodates solely fundamental info that could be wanted to do all sorts of plastic welding and ending.


Plastics that may be welded are known as “thermoplastics” that means that when heated to a sufficiently excessive temperature, they are going to soften and due to this fact may be welded. The commonest sorts of thermoplastics are Polyethylene, Polypropylene, Polyvinyl Chloride (PVC), Polyurethane and Acrylonitrile Butadiene Styrene (ABS).

Scorching air welding is handiest if the fabric is greater than 1/16” thick. An excellent weld will produce a joint that’s about as sturdy or stronger than the unique materials.

It’s obligatory that you simply apply on scrap materials to get the “really feel” of plastic welding earlier than beginning on an precise mission. Plastic welding takes apply similar to steel welding.


The welding rod should be the identical materials as the fabric you are trying to weld.

In some circumstances you might be able to decide the fabric you’re working with from info supplied by the producer of the product; in different circumstances you’ll not.

One methodology of figuring out the kind of plastic is by utilizing the “Burn Take a look at”. That is achieved by observing the way it burns, the colour of the flame, and the odor of the smoke. It might be essential to take away a small sliver of the fabric to carry out the burn check.

The next chart supplied the descriptive traits of the thermoplastics when subjected to the “burn check.”

No smoke, blue flame, candle wax odor Polyethylene (PE)
No smoke, orange flame, and odor Polypropylene (PP)
Black sooty smoke hanging within the air, candy odor Acrylonitrile Butanadiene Styrene (ABS)
Self-extinguishing, received’t flame Polyvinyl Chloride (PVC)
Black smoke, sputtering impact Polyurethane (TPUR)

Upon getting recognized the fabric you need to weld, you may choose the proper matching materials welding rod.


The right temperature of the airflow from the warmth gun may be very vital to producing weld. An excessive amount of warmth or not sufficient warmth will end in weak welds.

The next exhibits the proper welding temperatures for the varied sorts of thermoplastics:

Kind of Plastic Materials Welding Temperature
Polypropylene (PP) 575°F
Polyethylene (PE) 550°F
Acrylonitrile Butanadiene Styrene (ABS) 500°F
Polyvinyl Chloride (PVC) 525°F
Polyurethane (TPUR) 575°F

To check the temperature output, apply warmth to the welding rod you will have chosen. If the temperature is right, the rod ought to get cheesy after which very smooth. If the rod begins to liquefy, the temperature is simply too sizzling.


Plastic welds are very comparable in look to steel welds and most of the similar welding methods are used. Word that the perimeters of the elements to be welded are beveled. That is essential to make a easy weld. The next drawings present the varied sorts of widespread welds.


07062 – is positioned on the warmth gun as a base for 07201 and 07091
07201 – is used in case you are utilizing a inflexible welding rod
07091 – is used if the rod materials is versatile or inflexible

The temperature management dial must be set between 7 and eight on Fashions HL 1802 E and HL 2002 LE. The temperature management on the HL 1800 E must be set between 2 and three and on the HG 2000 E thumb wheel it must be set between the two and three notches.


1. Apply on scrap materials earlier than making an attempt to work in your mission.
2. Set up the welding tip on the warmth gun.
3. Reduce the tip of the plastic welding rod at a 60° angle. It is strongly recommended that the welding rod be so long as the joint being welded. This can forestall a weak spot within the weld the place the rods could also be joined.
4. Clear the elements you will weld with a moist fabric, after which dry with a dry fabric. Subsequent, align the elements within the place you need to weld them. It might be essential to clamp them in place.
5. Flip the warmth gun on and let it heat up for about 30 seconds and set it to the right welding temperature.
6. Maintain the weld rod near the place to begin and apply warmth to the rod and the bottom materials till each are cheesy. (The rod will begin to soften). Press the welding rod right down to the place to begin on the joint to be welded at a 90° angle.
7. Proceed transferring the warmth gun and the rod alongside the joint, making use of some stress on the rod because it melts into the joint, and transfer the warmth gun in a slight half-moon movement. Preserve making use of the warmth instantly over the joint. Transfer at a fair velocity and with a relentless stress throughout the joint. Don’t stretch the rod, as this can create a weak part within the weld.
8. On the finish of the weld, lower the rod off with a knife or facet cutter. Be sure you let the welding materials cool to room temperature earlier than testing the energy of the weld.

Warning: Plastic welding requires apply. Apply offers you the “really feel” for the proper stress to use on the rod, how briskly to maneuver throughout the weld, and what to search for to find out the energy of the weld.

The next drawings point out what correct and improper welds could seem like:

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