1. Zinc Aluminum Alloy Coated Steel

2. 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

3. Zinc Aluminum Alloy Coatings Applied by Hot Dipping Al = Durability in Industrial Atmospheres Zn = Formability and galvanic protection Galvalume 55% Aluminum, 1.5% Silicon, 43.5% Zinc A250 = 0.50 oz/sq ft (0.8 mil thickness) A255 = 0.55 oz/sq ft A260 = 0.60 oz/sq ft Galfan Type I: 5% Aluminum, 95% Zinc, misch metal Type II: 5% Aluminum, 95% Zinc, 0.1%Mg 12 coating weights GF235 = 2.35 oz/sq ft, through GF30 = 0.30 oz/sq ft

4. Typical Applications of Coated Steels Galvalume & Galfan -- Roofing & Siding -- Underbody Parts -- Exhaust Systems --Agricultural Equipment

5. Aluminum/ Aluminum Zinc Coating Need to brush oxide off surface Higher currents needed Reduced Electrode life

6. Zinc Aluminum Alloy Conventional Galvanized Galfan Galvalume Wider Face 4 to 5 times base metal thickness Dispersion Strengthened Electrode preferred

7. AWS Welding Handbook

8. Weld Time (cycles) Hot Dipped Galvanized AWS Welding Handbook

9. Seam Welding Slightly Higher Currents Lower Electrode Forces AWS Welding Handbook

11. Term Paper: Research Proposal