Fibreglass Weld Backing Tape  is typically used for welding thin wall stainless steel from one side.
The most popular Weld Backing Tape is 3" wide aluminum tape with adhesive strips on each side of a 1" wide woven tape strip in the middle.can offer huge benefits:
1. Less back purging
2. Less post weld dressing
3. Less fettling
4. Smoother flatter welds
5. One sided welding