Choose the right electrode. Stick electrodes with an AWS classification of 7018 are optimal, since they have a low iron powder content: The molten metal that 7018 electrodes produce results in a welding puddle that can freeze quickly, limiting the danger of it dripping off the work. A 6010 electrode can be used for similar reasons; however, it will require a whipping technique, in which the electrode is intermittently pulled out of the puddle. Avoid choosing a 7024, which would produce uncontrollable dripping.
Use filler metal with properties similar to those of the base metal. As in most forms of welding, similar base and filler metals are necessary to obtain the strongest possible weld.
Weld at the lower end of an electrode's amperage rating. A low amperage will help you maintain control over the welding puddles at each stair step by allowing them to freeze quickly and in place.
Create a weld shelf for all metal thicker than sheet metal. When vertical welding sheet metal, you can do vertical-down welding and move very quickly through the metal; with all thicker metals, you must create a weld base from the bottom up. Create one continuous weld at a time and continuously work above each previously laid weld. Zigzag back and forth when welding vertically up, allowing each puddle section to freeze before welding up to the next stair step. Each stair step should be 1.5 to 2 times the diameter of the electrode.
Add filler metal at a rate that allows you to maintain control over the growth of the welding puddle while filling the gouges created by your welding tool. Avoid undercutting, or gouging the work with insufficient filler metal. The slag should drip off the shelf, while the puddle should be large enough to fill the gouge and stay in place. If necessary, slow the process and limit the current to reduce the extent of gouging.