AWS FILLER METAL SPECIFICATION A5.1 MILD STEEL COVERED ELECTRODES EXAMPLE:   E 60 1 0 (1) (2) (3) ---- (4) 1.E — Stands for electrode. 2.Two digits indicate tensile strength x 1000 PSI. 3.Third digit refers to welding position. EXX1X All position (flat, horizontal, vertical, overhead). EXX2X Horizontal and flat only. EXX3X Flat position only. EXX4X Flat, overhead, horizontal, vertical down. 4.Last digit indicates usability of the electrode, i.e. type of current and the type of covering. In some cases, both the third and fourth digits are significant. Classification Current Arc Penetration Covering & Slag Iron Powder EXX10 DCEP Digging Deep Cellulose - sodium 0- 10% EXXX1 AC or DCEP Digging Deep Cellulose - potassium 0 EXXX2 AC or DCEN Medium Medium Titania - sodium 0-10% EXXX3 AC or DCEN or DCEP Soft Light Titania - potassium 0- 10% EXXX4 AC or DCEN or DCEP Soft Light Titania - iron powder 25-40% EXXX5 DCEP Medium Medium Low hyd. - sodium 0 EXXX6 AC or DCEP Medium Medium Low hyd. - potassium 0 EXXX8 AC or DCEP Medium Medium Low hyd. - iron powder 25-40% EXX20 AC or DCEN Medium Medium Iron oxide - sodium 0 EXX22 AC or DCEN or DCEP Medium Medium Iron oxide - sodium 0 EXX24 AC or DCEN or DCEP Soft Light Titania - iron powder 50% EXX27 AC or DCEN or DCEP Medium Medium Iron oxide- iron powder 50% EXX28 AC or DCEP Medium Medium Low hyd. - iron powder 50% EXX48 AC or DCEP Medium Medium Low hyd. - iron powder 25-40% DCEP — Direct Current Electrode Positive      DCEN — Direct Current Electrode Negative      Note: Iron powder percentage based on weight of the covering.     
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