Craftsman 113.201392 Owner's Manual

MOVI[ ROe Lip AND -_, .__. STARTCUTHEREF_gure 2To make a trial cut, place a bar of steel approximately1/4-1nch thick on the table so that ene end projects overthe edge. Use a 3/32-inch rod and a current setting ofaround 140 amperes. Hold the rod as shown in figure 1 andstrike an arc on the top corner at the edge of the bar wherethe cut is to be made. Feed the rod into the molten puddleand keep the crater burning through as the rod is movedacross the bar. To catch the molten metal, place a metalcontainer an the floor directly under the cut.When cutting metal heavier than 1/4-inch, the arc is startedat the bottom corner and worked up and down verticallyas shown in figure 2, advancing the bottom of the cutslightly ahead of the top of the cut to permit molten metalto run out more easily. If a smooth edge is desired, thepieces can be ground on an abrasive wheel. Electrodesdesigned especially for cutting may cllsobe used.REMOVING SEAMSIn addition to cutting, the electric welding arc can be usedfor beveling the edges of material to be welded, gougingout cracked welds for rewelding or removing tack-welds.The surface of the metal being worked upon should be ap-proximately in the vertical position, or tipped slightly towardthe arc (fig. 3). Start at the bottom of the seam to be gougedout and work upward. The rate of speed will depend uponthe depth of the groove and the amount of metal removed.BOLT AND RIVET CUTTINGRemoving rusty bolts or rivets is an easy job with an electricarc welder. The arc is struck on the head or nut of the boltand worked around in a slight circular movement until thehead is completely melted off (fig. 4). A punch is thenused to drive out the remaining part. The boff or rivet canbe removed by heating the head almost to the melting point,then quickly shearing it off with a cold chisel Care must betaken not to cause the bolt to become welded to the metalHOLE PIERCINGAnother useful appllcahon of the welding arc is piercingholes in metal. Coated metallic electrodes are best forthis purpose because of their small size and insulationafforded by the coating. The process is extremely fast anda surprisinglycleon circular hole can be made. Far practice,place a piece of scrap iron I/4-inch thick (or less) on thetable and allow it to project over the edge as for arccutting. Use a 3/32-inch rod and the same current as forcutting. At the place where the hole is to be pierced, strikean arc and hold it until a molten puddle is formed. Thenpush the electrode down against the molten puddle andforce it through the plate. It ispossible to hold the e4ectrodeagainst the melted plate because the metal core melts offfaster than the coating The coating (not the rod) touchesthe molten metal (fig. 5). The gap malntamed by the pro-truding coahng prevents the metal core of the electrodefrom sticking or freezing to the plate.If a larger diameter hole is desired, first pierce a hole asdescribed. Then, holding a fairly long arc, melt the edgesof the hole away by moving the rod around it (fig. 6). Holesof almost any diameter can be made. To pierce a holethrough material thicker than 1/4-inch, work from theunderside.HEATINGThe carbon arc prowdes a convenient method for localizedheating of all metals. Simply strike an arc on the part to beheated and "play" it across the surface unfit the requiredtemperat_ureis reachedGOUGINeFigure 3MOL1TNFigure 4 FJgure 5 Figure 61-1E