Coated Steel Production. Resistance Welding Lesson Objectives When you finish this lesson you will understand: Learning Activities 1.View Slides; 2.Read.

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Presentation transcript:

Coated Steel Production

Resistance Welding Lesson Objectives When you finish this lesson you will understand: Learning Activities 1.View Slides; 2.Read Notes, 3.Listen to lecture 4.Do on-line workbook Keywords

Types of Coated Steels Hot Dipped Zinc Coated –Regular & Minimized Spangle –Fully Alloyed Iron Coated –Differentially Coated Electrolytic Zinc Coated Hot Dipped Zinc Coated One Side Electrolytic Zinc Coated One Side Electro-Alloyed Aluminum Coated Long Terne Tin Coated Zincrometal

Hot-Dipped Galvanizing Process Clean Rinse Preheat Heat Zinc Pot F Cooling Tower Leveler Chemical Treatment (opt) Welder Air Knives

steel Aluminum Oxide Passive Layer Zinc Hot-Dipped Galvanized Increased Coating Adherence, Passive Layer Aids in Wetting Frosted Spangle Zinc Layer Thickness 0.13 to 1.2 oz/sq ft to in.

Spangle Control in Hot-Dipped Galvanizing micro-inches Air Spray Fine Zn Dust Nucleii

Zeta Delta Gamma AlphaSteel

Steel Gamma Delta Zeta Time Thickness Annealing Furnace In Line Furnace Hot Dipped Galvannealed

Electro-Galvanizing Process Zinc Anode Steel Cathode Surface Clean Zinc Sulfate Bath micro-inch Cold Process, no alloying, no change in substrate Very Smooth Surface Can Also Tin Plate Using Tin Anode and Sodium Stannate Bath

Electro-Alloy 9%Fe - Zn 23%Fe - Zn 30%Fe - Zn 20%Ni - Zn 27%Ni - Zn Electro-Duplex Multiple Layers Zn, Zn Alloys, Sn Electro-Coating Variations

Making & Shaping of Steel, USS, 1964

Making & Shaping of Steel, USS, 1964

Zinc Steel Zinc Alloy Layer Steel Gamma Delta Zeta GALVANIZEDSTEELMETALLURGYCOMPARISON Time Thickness

Typical Applications of Coated Steels Hot Dipped Zinc Coated –Rocker panels –B posts –Wheelhouse outer panels –Cowl top panels –Luggage compartment floor pans Electrolytic Zinc Coated –Window guides –Wiper blade frames –Radio speaker baskets –Head rest supports Zincrometal Doors Front fenders Quarter panels

Typical Applications of Coated Steels (CONT.) Hot Dipped Zinc Coated One Side –Fenders –Door outer panels –Rear quarter panels –Deck opening lower panels Electrolytic Zinc Coated One Side –Door outer panel –Rear quarter panels –Fenders –Deck lids –Lower back panels