Q. Describe the Selection of elctrodes?
The selection of a proper electrode for electric arc welding is very important to obtain a sound welded joint of proper strength. The various factors affecting the selection of electrodes are:
• Power source: A.C. or D.C.
• Composition of base metal.
• Thickness of base metal.
• Welding position.
• Welding current conditions recommended by the manufacturer of the electrodes.
• Mechanical properties desired in the joint.
• Extent of penetration required in welding.
• Economic considerations.