ABT52_2016_+Welding+Execrsises - ABT52(2017 Students Name WELDING I SMAW EXERCISES II Ox-Ac W III GMAW IV GTAW 1 ABT 52(2016 WELDING EXERCISES I SMAW 2

ABT52_2016_+Welding+Execrsises - ABT52(2017 Students Name...

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EXERCISE #1 EFFECT OF CURRENT CHANGES ON THE WELD OBJECTIVE: TO SEE THE EFFECTS OF CURRENT (AMP) CHANGES ON THE ELECTRODE AND WELD BEAD FOR FLAT POSITION . SETUP: Using proper safety equipment, observe the changes in the weld bead when the current settings are changed. Perform these practices in flat position with two different types of 1/8” electrode ( E6013, and E6011) and 3.5 ”x2”x ¼” flat bar. 3
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PROCEDURE: FOR EACH TYPE OF ELECTRODE (E6013 and E6011) : 1. Set the machine at the LOWER RANGE of electrode manufactures recommendation (Table1) strike an arc and run A BEAD of 3“ long . o Raise the current setting by 10 amps (or one “click”) and make another bead of 3” long on the same bar. o Repeat raising the current and making a bead 4 times. 2. With the same type of electrode, reset the machine to the HIGHER RANGE and run a bead of 3” long on a second bar. o Lower the current settings by 10 amps and make another bead of 3” long. o Repeat the procedure 4 times or until the welder no longer functions. 4
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OBSERVATION: After cooling and chipping the slag off, inspect the beads for: WIDTH, BUILDUP, MOLTEN WELD POOL SIZE, SPATTER, PENETRATION, and GENERAL SHAPE AND QUALITY Record your observations. Your observations should include changes you noticed when the amps were turned up or down for each size of electrode. 5
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Table 1. Suggested Metal Thickness and Amperage Ranges for Electrodes 6
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EXERCISE # 2 HORIZONTAL POSITION WELDING OBJECTIVE: To make WELD BEADS in the Horizontal position using 1/8" diameter E6013 , and E7018 electrodes on 3.5”x2”x1/4" steel bar. SETUP: Using a properly set up and adjusted SMAW machine (for the assigned type of electrode), proper safety equipment, 1/8" E6013, and E7018 electrodes, and a piece of 3.5”x2”x1/4" mild steel bar, you will weld stringer beads in the Horizontal Position . 7
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PROCEDURE: The electrode should be pointed upward at an angle of about 20 degrees (see the image on the next slide). This is to counteract the sag of the molten metal in the weld pool. The electrode is also inclined 20 degrees in the direction of travel of the weld. A short arc gap should be used to ensure the filler metal will travel across the horizontally positioned arc. To eliminate undercutting at the edge of the bead stop momentarily at the upper end of each swing of the electrode. This will deposit additional metal and will help to eliminate undercutting. Do the E6013 bead on one side and the E7018 on the other side. 8
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EXERCISE # 3 VERTICAL UP POSITION SMAW OBJECTIVE: Stringer Beads in the Vertical Up position using 1/8" diameter E6013 , and E7018 electrodes on 3.5”x2”x1/4" mild steel.
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  • Fall '08
  • Staff
  • Welding, Weld, gma, proper safety

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