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Airless Fusion Welding -
Tear in the Face of a Bumper Cover
Standard Operating Procedure
Bumper covers are damaged in accidents every single day. A tear in the face of a bumper cover is one of the most common types of damage. Polyvance’s airless plastic welder can be used to repair this kind of damage.
This SOP references an airless welder with a tube tip, like the 5700HT Mini-Weld Model 7 or the 5211 PolyPro Welder.
Click here to open this SOP as a PDF.
Watch the video of this repair:
- PPE (medium-duty gloves, safety glasses, respirator)
- Plastic cleaner
- Aluminum tape
- Die grinder or Dremel® tool with a round or pointed tip
- Stainless steel wire mesh
- Metal tool (like a flathead screwdriver)
- Airless plastic welder with tube tip
- Plastic filler rod
- Sander or sanding block
- Sandpaper (80 grit)
Clean the bumper cover with soap and water. Rinse and allow to dry. Spray 1001-4 EcoPrep or 1000 Super Prep Plastic Cleaner and wipe dry with a clean, lint-free towel. Make sure the surface is completely dry before continuing.
Align the tear. If there are any dents or deformations in the area, remove them now. Once the tear is properly aligned, apply 6482 aluminum tape over the tear on the cosmetic side. Aluminum tape will secure the tear and prevent melted welding rod from pushing through.
On the backside, use a die grinder or Dremel® tool to expose the raw plastic around the tear, about half an inch on all sides.
Select the welding rod that matches your bumper cover plastic. (Use R02 welding rod for polypropylene bumper covers).
Use the sharp edge of the welder tip to melt a 1-to-2-inch groove in the plastic along the tear, and then push the displaced plastic back into the groove.
Note: The key to this type of repair is to only work in small 1-to-2 inch sections at a time. Don't try to prepare and weld too large of an area at one time, because you won't be able to maintain heat to the substrate.
Feed the welding rod through the tube in the tip and onto the melted plastic.
Once enough filler rod has been applied, use the welder tip to mix the rod and base material together and smooth the weld.
Repeat the grooving and welding process all the way down the tear.
The backside weld is complete. Allow the weld to cool completely before continuing.
Remove the aluminum tape from the cosmetic side and apply it over the weld on the backside.
Clean the cosmetic side with plastic cleaner to remove any adhesive residue.
Sand the repair area with 80 grit sandpaper to expose the raw plastic.
Weld the cosmetic side along the tear. Melt an indentation into the plastic along the tear, push the melted plastic back into in the indentation, feed the welding rod through the welder tip, and push the filler rod onto the melted plastic. Once enough filler rod is applied, mix the welding rod and base material together and smooth the weld.
Work in 1-to-2-inch sections at a time until the tear has been welded completely.
Allow the weld to cool completely and then remove the tape from the backside.
Sand the weld with 80 grit sandpaper.
The welding is complete. At this point, you can begin the refinishing process.