... S ASME Pressure Vessel Certificate 3) ISO9001:2008 ABS,DNV Welding Frame Structure1) Material : carbon steel ,stainless steel 304,sus 316L ... ,sus 316Ti,aluminium alloy2) Processing: hand welding,laser welding, SAW,TIG,surfacing welding,etc.3) Surface finish: zinc plating ,hot dip ... design, trial-produce ,mass production,assemble,commissioning,after service. frame welding parts