I have a 45 x45 wall hanging I am completing and do not want to go into town to purchase batting when I have pieces at home. How do you make it one piece? Or do you leave it alone till you sandwich it?

Set your machine on the biggest zig zag stitch you have and put them together that way.

Or buy the "batting tape" from Nancy's Notions/JoAnn's, etc. and tape them together.

i love the batting joining tape

You can put it together by using the batting tape, use your widest zig zag stitch on your machine or you can whip stitch it by hand.

butt 2 pieces together (you might have to trim them to get a straight edge) and zigzag. I don't use the widest zigzag, though because it's really wide on my machine.

I whip stitch but just ordered the tape from Eleanor Burns' site. It was on sale. Can't wait to try it.

What's whip stitch?
David

A whip stitch is an overcast stitch - in on one side of the seam, out on the other, pull through.

I don't sew or use the joining tape when I spray baste or when I'm using fusible batt. If you get the pieces butted well without any overlaps, then spray, the fabric you put over it will hold the joins together.

I have done all three I prefer to hand sew mine not to fond of the tape.

On my quilt as you go blocks we learned to join batting by hand using small x down seam.