User manual LINCOLN ELECTRIC AC-225-S

[. . . ] 7 Includes safety, installation, operating instructions and parts lists. For additional safety information, it is strongly recommended that you purchase a copy of "Safety in Welding & Cutting ANSI Standard Z49. A Free copy of "Arc Welding Safety" booklet E205 is available from the Lincoln Electric Company, 22801 St. Turn off input power using the disconnect switch at the fuse box before working on the equipment. [. . . ] Point the electrode down in the crack between the two plates, keeping the electrode slightly tilted in the direction of travel. Watch the molten metal to be sure it distributes itself evenly on both edges and in between the plates. Penetration Unless a weld penetrates close to 100%, a butt weld will be weaker than the material welded together. 5mm) the thickness of the material; thus the weld is only approximately half as strong as the metal. In this example, the joint has been flame beveled or ground prior to welding so that 100% penetration could be achieved. The weld, if properly made, is as strong or stronger than the original metal. Fillet Welds When welding fillet welds, it is very important to hold the electrode at a 45° angle between the two sides, or the metal will not distribute itself evenly. To make it easy to get the 45° angle, it is best to put the electrode in the holder at a 45° angle, as shown: Put the first bead in the corner with fairly high current. Hold the electrode angle needed to deposit the filler beads as shown putting the final bead against the vertical plate. Welding in the vertical position can be done either vertical-up or vertical-down. Vertical-down is used primarily on sheet metal for fast, low penetrating welds. Vertical-Up Welding The problem, when welding vertical-up, is to put the molten metal where it is wanted and make it stay there. If too much molten metal is deposited, gravity will pull it downwards and make it "drip. When welding, the electrode should be kept horizontal or pointing slightly upwards. The arc is struck and metal deposited at the bottom of the two pieces to be welded together. Before too much molten metal is deposited, the arc is SLOWLY moved 1/2-3/4" (12. (If the arc is not taken away soon enough, too much metal will be deposited, and it will "drip. Most definitely, the arm must not move in and out, as this makes the entire process very complicated and difficult to learn. If the upward motion of the arc is done correctly with a wrist motion, the arc will automatically become a long arc that deposits little or no metal. During this entire process the ONLY thing to watch is the molten metal. As soon as it has solidified, the arc is SLOWLY brought back, and another few drops of metal are deposited. When the arc is brought back to the now solidified puddle, IT MUST BE SHORT, otherwise no metal will be deposited, the puddle will melt again, and it will "drip. [. . . ] They are primarily general purpose production electrodes especially for downhill fillets and laps or short and irregular welds that change direction or position. also widely used in maintenance and recommended for sheet metal fillet and lap welds. Motion "D (below) is generally used for vertical-up welding, but motions "A" and "B" are also suitable. Low Hydrogen Group (E7018, E7028) These electrodes are generally called "low hydrogen. [. . . ]