The digit(s) following the letter ''E'' represent the tensile strength of the electrode in ksi (6 means 60 ksi, 10 means 100 ksi, etc.)

Finished welds should be inspected to ensure their quality. Inspection should be performed by qualified welding inspectors. A number of inspection methods are available for weld inspections, including visual inspection, the use of liquid penetrants, magnetic particles, ultrasonic equipment, and radiographic methods. Discussion of these and other welding inspection techniques can be found in the Welding Handbook (AWS 1987).

4.1.8 Weldability of Steel

Weldability is the capacity of a material to be welded under a specific set of fabrication and design conditions and to perform as expected during its service life. Generally, weldability is considered very good for low-carbon steel (carbon level < 0.15% by weight), good for mild steel (carbon levels 0.15 to 0.30%), fair for medium-carbon steel (carbon levels 0.30 to 0.50%), and questionable for high-carbon steel (carbon levels 0.50 to 1.00%). Because weldability normally decreases with increasing carbon content, special precautions such as preheating, controlling heat input, and post-weld heat treating are normally required for steel with carbon content reaching 0.30%. In addition to carbon content, the presence of other alloying elements will have an effect on weldability. Instead of more accurate data, the table below can be used as a guide to determine the weldability of steel (Blodgett, undated).


Range for satisfactory weldability

Level requiring special care (%)



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