Detection of stainless steel cap

　　When the direction of weld stainless steel cap splicing requirements only is radial and circumferential. After the large stainless steel cap may cancel this request. The distance of the splicing should be required to be greater than 3 Delta, and not less than 100mm (the heat affected zone of the welding is a high stress zone, and the chemical composition in this area will be burned. " So we should avoid the high stress zone, which is related to the thickness. According to practical experience, the stress attenuation length is greater than 3 Delta, and not less than 100mm). But it is very difficult to meet the requirements of the refrigeration equipment, and it has its particularity.

　　ASME B16.9 316 Seamless Butt Welding Stainless Steel Cap molding after stitching, welds should be 100% radiographic or ultrasonic testing, qualified level with the equipment shell to go. Finally, the test grade and proportion of the weld seam are the same as that of the equipment shell, which is high waste.

　　For example: if the equipment shell is 20% detection, III is qualified. The bulkhead welds and final weld III welding joint is qualified, coefficient of 0.85;

　　If the equipment shell is 100% test, II is qualified. The bulkhead welds and final weld II welding joint is qualified, coefficient of 1.So although the 100% bulkhead splicing detection, but the qualified level is not the same, go with the equipment shell.