Yes it is .. Are they wood or steel?
Either needs a sleeve of steel over the diameter. It needs to be a tight fit and is best pushed together on the floor and glued with araldite or polyurethane foaming adhesive.
Measure the diameter with a caliper or make a hole in something rigid to match the pole size (so the pole just pushes through)
Look here .. They do 28mm and 35mm (standard pole sizes) joiners
http://shop.ebay.co.u...d=p3286.c0.m270.l1313
Failing that, go to a local steel fabricator or engineering shop and ask for a piece of tube to join it. (About 4" long should be ok if a tight fit)