I just did some plastic welding to put my car back on the road. I do not know what Istanbul has, but hopefully it is better than the $75 Harbor Freight plastic welder?
I do not care how much skill you have, my welder stopped blowing hot air. A plastic welder like a soldering iron (or just a soldering iron) would work, but melting it onto stainless steel mesh is supposedly the correct method, laying down another layer of plastic on top.
My bumper is polypropylene and I found a cheap plastic folder to use for material, but it depends on what the material is.