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