Abstract: This paper mainly uses digital radiographic testing technology to test the welding parts of air conditioners. The test results show that the DR detection technology can effectively detect the various components of the air conditioner, especially for the welded parts of brass and copper dissimilar materials with large cross-section changes, which can achieve clear and accurate judgment of weld quality; Compared to the destructive detection method of artificial dissection, the nondestructive testing technology not only reduces the labor intensity of employees, but also avoids cost waste. At the same time, the introduction of this technology greatly improves the production efficiency and ensures the product quality.