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1. Sheet metal parts processing (flange, flange cover, foot parts, bracket): feeding---blanking---punching--forming---(flange tapping)- ---(flange cover riveting); 2. Tank head processing: feeding---blanking---stretch forming---trimming---shrinking---pipe connection, flange welding ---Girth seam welding of upper and lower heads---Accessory welding---Leak detection---Surface shot peening---Spraying---Skin assembly.