... 36*27 20*20...3.surface treatment:weld,sintering ,polishing,sand blast4.bottom case:silver-alloy brazing ... nickel alloyProduction process:Stamping,Forming,Cutting,Punching,Positioning,Sintering,Welding,Plating,etc. Surface Treatment:polishing,electroplate,electroless ... Major Equipment:Stamping machines,Punching machine,Cutting machine,Sintering machine,Seam welding machine,Spot welding machine, Milling ...