Qingdao Haiqing Machinery Co.,Ltd.is a subsidiary of China National Machinery Industry Corporation, China Ocean Aviation Group Limited,is an excellent supplier of the international refrigeration industry, the company has passed the ISO9001:2008 quality management system certification, the production of copper and aluminum connecting pipes, copper and aluminum pipe joints, aluminum refrigeration pipe group is the best quality aluminum copper system group in the refrigeration industry, products in Haier, Hisense, Gree, LG and other enterprises to have been longterm batch application. Qingdao Haiqing Machinery Co.,Ltd.with the Department of Materials from Ocean University of China jointly built an enterprise R&D center, jointly compiled JB/T 11525-2013 "Copper Aluminum Connecting Tube for Air Conditioning and Refrigeration Equipment" standard, has 49 authorized patents at home and abroad, and has mastered the world-class copper and aluminum tube welding technology and aluminum tube brazing technology, and has won the 10th China Patent Gold Award, the 6th China International Invention Exhibition Gold Award, and the Paris International Invention Fair Silver Award,It can complete the welding of copper and aluminum tubes of Ф3~Ф35, 1 series and 3 series aluminum alloys.