Craftsman 113.201392 Owner's Manual

Figure 11Figure 8Figure 9Figure tO _UTTINGFigure 12_ _ EXCESS WELD_Figure 13LAPWELDS LAPWELDSFigure 14 Figure 15Figure+ 16INTERMITTENTWELOSSTAGGEREOiNTER+WELDSFigure 17WELD_'\OHBOTHSIRESATENDOF JOINTshould be nearly flat with a slight radius at the sides ortoes. Avoid excessive concave or convex surfaces of thefillet (fig. 7). Undercuts and cold-laps are caused by notholding the rod in the center of the seam (fig. 8). If thedesired fillet weld cannot be made with a single pass,several passes are usedto build it up to required size (fig. 9).Slag must be cleaned from each pass before depositingthe next. Fillet welds over 1/2-inch in size are rarely usedbecause ioints requiring more strength can be made moreeconomically by beveling and groove+welding, followedby a small concave fillet weld to provide a radius in thecorner,Horizontal fillet welding is used when the side or edge ofone member of the joint is in the vertical position particularlyfor small single-pass welds where the work cannot be tilted.For practice, tack+weld two pieces of scrap together toform a tee-jolnt (fig. 10). Use a 5/32-inch rod held atangles indicated, and direct the arc into the corner ot thejoint. The arc length should be somewhat shorter than forflat fillet welding. To assure penetration at the root, use thehighest welding current that ca_ be handled (fig. 11).Good penetration is of prime importance and appearancewill come with experience. If the arc is advanced too fast,or held too close to the vertical plate, undercutting mayresult (fig. 12). Too slow travel will cause overlapping andan extremely close arc or low current will produce a beadwith a convex surface (fig. 13). To check the penetration andsoundnessof the bead, break some of the welds for inspec-tion, as shown in figure 4+When making a lap weld, care should be taken not to metttoo much of the upper corner on the top plate (fig. 14).Some melting will take place, but proper advance of therod will cause the weld metal to build up and blend into thetop surface. On sheet metal, hold the 3/32-inch rod almoslperpendicular and move the arc rapidly. Welds of thistype should be wider than they are high, somewhat like aflat beacJ (fig. 15). A sfight discoloration on the undersideof the lower sheet indicates good penetration. On heavymetal, a 3/8+inch fillet weld can be laid in one pass with a1/4-inch rod using a 295-ampere machine. However, withsmaller machines, the same weld or larger can be made bybuilding up with a number of passes (fig. 16). Whenwelding long narrow pieces, stagger the welds in shortintermittent beads, first on one side then on the other side,to minimize distortion (fig. 17).t-)O