Zinc Aluminum Alloy Coated Steel. Resistance Welding Lesson Objectives When you finish this lesson...
Transcript of Zinc Aluminum Alloy Coated Steel. Resistance Welding Lesson Objectives When you finish this lesson...
Resistance Welding
Lesson ObjectivesWhen you finish this lesson you will understand:•
Learning Activities1. View Slides; 2. Read Notes, 3. Listen to lecture4. Do on-line workbook
Keywords
Zinc Aluminum Alloy CoatingsApplied by Hot Dipping
Al = Durability in Industrial AtmospheresZn = Formability and galvanic protection
Galvalume 55% Aluminum, 1.5% Silicon, 43.5% ZincA250 = 0.50 oz/sq ft (0.8 mil thickness)A255 = 0.55 oz/sq ftA260 = 0.60 oz/sq ft
Galfan Type I: 5% Aluminum, 95% Zinc, misch metalType II: 5% Aluminum, 95% Zinc, 0.1%Mg
12 coating weights GF235 = 2.35 oz/sq ft, throughGF30 = 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 AlloyConventional Galvanized
Galfan Galvalume
Wider Face4 to 5 times base metal thickness
Dispersion Strengthened Electrode preferred