NANTONG TIANJI WELDING BACKING CO.,LTD. has nearly twenty years' manufacture experience. At present it has produced four kinds various specifications welding backing, including hand electric arc welding; Co 　gas protective welding; vertical gas & electric welding and automatic submerged arc welding etc series; single-sided welding use backing. JN series welding backing is widely applied in shipbuilding, chemical engineering bridge and steel structure manufacture industry. Domestic large-scale shipyards such as Jiangnan Ship Building (Group) Co., Ltd., Dalian New Shipbuilding & Heavy Industry Co., Ltd., Nantong COSCO KHI Ship Engineering Co., ltd., Hudong Ship Building (Group) Co., Ltd., Shanghai Waigaoqiao Ship Building Co., Ltd., Shanghai Shipyard and so on dozens of shipyard adopt our products which are also sold far to Japan, Spain, Singapore, Korea, India, Italy, Hongkong etc countries and regions. They are well-received by vast customers. The quality and technical performance of JN series welding backing conform with shipbuilding standard and P.R. China Shipping industry standard. Approved by Ch- ina Classification Society （CCS）and U.S.A Classifica- tion Society （Amercian Burean of Shippin- g）and tran- sferably approved by world's major classification socie- ties (LR, DNV, GL , BV), JN series welding backing wins sci-tech progress No. 3 prize by China Shipping Industry (CSSC). It also wins ISO9002 quality system assurance certificate only at present in this profession.