Casement Tubular Seals
Hello! Thanks so much for submitting your inquiry. Sounds like you need new weatherstripping.
We sell an absolute ton of different styles, but it's unfortunately not possible to identify what you have based on these photos. This service requires a clear photo of the seal out of the window and shown from an angle that displays the end profile. The video below will clarify what I mean.
You did mention that the edges are welded, which is going to make this task difficult. Basically whoever made the window didn't expect anyone would need to repair it. As such you need to make your own openings in the frame to remove the seal. We have another video on that, which I'll also share. This happens quite often and is an unfortunate necessity for this kind of job.
These are going to be a necessary steps. I know it's a hassle, but there's not an easier way to identify the seal on this kind of window. An end profile view is necessary at minimum.
Once we see the seal, we can give you some options that will match its profile and size, and furthermore look into whether there's anything a little bigger. Sometimes there, is sometimes there isn't. In all likelihood the old seal is just old and over compressed from age and use.
Great, please let us know whenever you can get those photos to us and we can work from there. I'm optimistic we'll have something.
They do make adhesive-backed wool pile. We did sell a type like that some years ago, but it was discontinued by the manufacturer and that's not currently something we can carry. It is a possible option though, but let's cross that bridge if we get there.