Hot air welding machine for PVC flexible sprial duct tube welding

Before you weld the steel wire to make the sprial PVC fexible duct,you need use hot air welding machine to make a PVC tube as the video.Hot air welding machine make the tube welding continuously like sewing machine due to its rollers design.Also it doesnt need any customzied welding moulds.More solutions,welcome to conatct us.sumdawelder.com/24-Hot-air-we...