Stainless steel:. 304 304L 316 316L 321 2520 310,317, and other materials Diameter: DN15-DN1200 wall thickness: SCH5-SCH160 standard: ASME DIN JIS BS GB / T JB SH HG, as follows: GB / T12459-2005, GB / T13401-2005, ASME B16.9, SH3408, SH3409, HG / T21635, DL / T695, SY / T0510, DIN2617 uses: water, soft drinks, beer, food, petrochemical, nuclear power, machinery, medical equipment, fertilizer, shipbuilding, water treatment, pipeline and other packaging: wooden, cardboard disc cap of r at avoiding stitching, will thinned, high stress. When splicing requires only allows the weld direction is radial and circumferential. After the large caps may cancel this requirement. The distance should require stitching, for more than 3δ, and not less than 100mm (HAZ is a high stress area, and in the chemical composition of the area will be burning. So to avoid high stress area, the region and the thickness of the relevant According to experience, the stress decay length greater than 3δ, and not less than 100mm). But refrigeration equipment is difficult to meet this requirement, has its particularity. After forming the head stitching, seam stitching should be 100% ray or ultrasonic inspection, qualified level with the equipment housing go. Finally formed weld detection level, the same proportion of the housing and equipment, high waste. Hemispherical head Example: If the housing is 20% detection equipment, III qualified. That bulkhead and final weld seam stitching III also qualified weld joint coefficient is 0.85; if the case is 100% detection equipment, II qualified. That bulkhead and final weld seam stitching II also qualified weld joint factor of 1 100%, although it bulkhead splice detection, but the quality level is not the same case with the device away. But pay attention to the process of manufacturing process: The correct approach is: cutting (dash) - small plates makes up a large plate - forming - NDT before molding do not detect if it is wrong, can not guarantee the quality of after molding products. That means the final NDT NDT.