• Add filler metal to the pool and begin welding using small semicircular movements. • Keep the weld pool in the corner of the joint as welding rod is added. • Direct the flame toward the surface of the bottom piece. • Keep the bead on the top workpiece straight and uniform . 32
EXERCISE # 4 TEE JOINT FLAT POSITION Setup: • Use a properly set up and adjusted oxyacetylene cutting torch , proper safety equipment, two clean pieces of 1/16" thick, 1.25” wide X 3" long mild steel, and proper size of filler rod. 33
TEE JOINT FLAT POSITION 34
Procedure: • Position the work pieces on the firebricks. • Use a magnet or another firebrick to hold the vertical piece in place. • Tackweld each end. • If using a magnet remove it at this time. • Light the torch and hold it at a 45 degree work angle and a 60 degree travel angle. • Form a molten weld pool at one end and add welding rod. • Keep tip of flame 3/32" away from the surface. • Heating the vertical piece too much will cause undercutting. • This can be stopped by adding rod to the top of the weld pool. • As you weld, add enough welding rod to produce a 1/8” to 3/16" bead width. • Practice making fillet joint welds until you can consistently make uniform beads. • When you are finished with this exercise , perform the equipment shutting down procedure, and thn, clean up your work area. 35
EXERCISE # 5 OUTSIDE CORNER JOINT, FLAT POSITION Setup: • Use a properly set up and adjusted oxyacetylene welding torch , proper safety equipment, two clean pieces of 1/16" thick, 1.25” wide X 3" long mild steel, and proper size of filler rod. You will make a flat position outside corner joint. Place one of the pieces of metal in a jig or on a fire brick and hold or brace the other piece of metal vertically on it. 36
Ox-AcW Outside Corner Joint, Flat Position 37
Procedure: • Tack the ends together and one or two tacks on the middle. • Hold the torch as shown and make a uniform weld along the joint. • This weld could also be done satisfactorily, without rod • When you have finished this exercise , perform the equipment shutting down procedure, and then, clean up your work area. • Check for complete penetration. 38
III. MMAW ABT 52 (2017)
MIG Welding Exercise #1 HORIZONTAL AT 45 DEGREE ANGLE BEADS SETUP: • Using a properly set up and adjusted MIG welding machine, proper safety equipment, .035 diameter wire , and provided welding coupon(1/8”x 2”x 3.5” strip ), make a few stringer beads, on both sides; one side with forehand motion and the other side with backhand motion.
PROCEDURE: 1. Follow the manufacturer’s recommendations to set the welding machine. 2.Hold the welding coupon on a 45 degree angle plane 3. Start horizontally , at one end of the work piece and maintain 1/4 to 3/8" stick out from gun nozzle tip to work piece.
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- Fall '08
- Welding, Weld, gma, proper safety