作为冰箱和空调器心脏的压缩机产量越来越大，但大制冷量的空调器，如7000大卡／时以上制冷量的压缩机国内尚不能生产，均需从美。日、法等国家进口。做为压缩机生产关键工艺的环形封装焊缝是一道重要工序，焊缝质量有严格的要求。大制冷量（7000大卡／时、12000大卡／时、2400 As the heart of the refrigerators and air conditioners compressor production more and more large air conditioner, such as refrigeration capacity of 7000 kcal / h above the compressor can not be produced domestically, are required from the United States. Japan, France and other countries import. As a key manufacturing process compressor compressor ring seal is an important process, the quality of the weld has strict requirements. Large cooling capacity (7000 kcal / hour, 12,000 kcal / hour, 2400