Deposition Rate: The weight of material deposited in a unit of time. Direct Current Electrode Negative (DCEN): The arrangement of direct current arc welding leads in which the electrode is the negative pole and work piece is the positive pole of the welding arc. Direct Current Electrode Positive (DCEP): The arrangement of direct current arc welding leads in which the electrode is the positive pole and the work piece is the negative pole of the welding arc. Discontinuity: An interruption of the typical structure of a material, such as a lack of homogeneity in its mechanical, metallurgical or physical characteristics. A discontinuity is not necessarily a defect. DOT: Abbreviation for “Department of Transportation”. Downslope Time: The time during which the current is changed continuously from final taper current or welding current to final current. Drag Angle: The travel angle when the electrode is pointing in a direction opposite to the progression of welding. This angle can also be used to partially define the position of guns, torches, rods, and beams. Dross: The remaining solidified oxidized metallic material adhering to the work piece adjacent to the cut surface. Duty Cycle: The percentage of time during a specified test period that a power source or its accessories can be operated at rated output without overheating.