... for aluminium welding joint one-side welding."Yuan Hang"JN series welding backing is widely used in shipbuilding, chemical industry, bridge ... , pressurecontainer , stainless steel and so on. Yuang Hang JN series welding backing has been subjected to the approval of CCS ... , ABS, GL ,LR, BV, DNV and so on. Ceramic welding back up tape JN-1401