《Liccoln WPHB - Section 09 (Welding Aluminum and Aluminum Alloys)》.pdf

Section 9 WELDING ALUMINUM AND ALUMINUM ALLOYS SECTION 9.1 WELDABILITY OF ALUMINUM AND ALUMINUM ALLOYS Page Alloy Types 9.1-1 Heat Effects of Welding 9.1-1 Hot Cracking of Weld Metal 9.1-2 Filler Metals for Welding Aluminum Alloys. 9.1-3 Surface Preparation for Welding 9.1-5 Need for Cleaning 9.1-5 Examples of Cleaning Procedures 9.1-6 SECTION 9.2 WELDING ALUMINUM AND ALUMINUM ALLOYS WITH THE SHIELDED METAL-ARC PROCESS Electrode Selection 9.2-1 Preheating 9.2-1 Welding Techniques 9.2-2 SECTION 9.3 WELDING ALUMINUM AND ALUMINUM ALLOYS WITH THE GAS METAL-ARC PROCESS Process and Equipment 9.3-1 Maintaining GMA Weld Quality 9.3-1 Inert Gases for GMA Welding 9.3-6 Procedures for GMA Welding 9.3-7 SECTION 9.4 WELDING ALUMINUM AND ALUMINUM ALLOYS WITH THE GAS TUNGSTEN-ARC PROCESS GTA Welding Arcs 9.4-1 Alternating-Current GTA Welding 9.4-2 Direct-Current Electrode Negative GTA Welding 9.4-9 Direct-Current Electrode Positive GTA Welding 9.4-10 9.1-1 Weldability of Aluminum and Aluminum Alloys* ALLOY TYPES Wrought aluminum alloys are generally produced yield strengths after 15 to 30 days of aging at room in five basic categories: a) flat plate or s