Zinc Aluminum Alloy Coated Steel

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

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

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

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

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

AWS Welding Handbook

Weld Time (cycles) Hot Dipped Galvanized AWS Welding Handbook

Seam Welding Slightly Higher Currents Lower Electrode Forces AWS Welding Handbook

Term Paper: Research Proposal