How to make an inflatable PVC tube by hot air welding machine

How to make an inflatable tube?Some friends will choose the high frequency welding machine to finish it.But it needs more welding moulds and working efficiency is not satisfying.Here you will find another solution to use the hot air welding machine,which uses no welding moulds and faster welding speed.
sumdawelder.co...

[@shyamalpatel627]

But how did you weld last open gap ?

[@jimyang1754]

I'll show you on Whatsapp.My number is 008615851998391