Hi Aaron – sorry I didn’t see this until now. There’s a bug in the forum software that was holding posts with multiple pictures in a hidden section, waiting for moderation, but it wasn’t notifying me about them. Hopefully I’ve fixed it now… we shall see. Don’t be afraid to email me if you don’t get a response within a day or so.
Anyway, your welds look pretty good to me. Ideally there would be equal amounts stuck to each of the 250 GSM fabrics, but what I see isn’t so bad – clearly the TPU layers are welding together. Try heating it for a shorter amount of time and that might help, but even if it doesn’t change, you’re certainly getting solid welds.
For the tube-to-floor welds with the 450 GSM fabric, this unequal peeling is to be expected (see my response to Jason below). The 450 GSM fabric is new and I hadn’t posted about this in the heat sealing technique page until recently, so you probably didn’t see it. Thanks for asking.