WEL 249 - Adv Arc II GMAW Alum Unlimite

1. Incorporate the safety rules for using shielded metal arc welding equipment.
   1. Describe safety rules when setting up SMAW equipment.
   2. State what personal safety gear is worn when using SMAW equipment.
   3. Explain how to prevent electrical shock when using equipment.
   4. Practice safety in all work situations. // Level 3 Apply

2. Differentiate the function of AC and DC current as it relates to different polarities.
   1. Identify the difference between AC and DC current.
   2. Select the electrodes used with AC and DC polarity.
3. Demonstrate the proper set up, start up and shut down procedures of arc welding equipment.
   1. Illustrate proper set up of equipment.
   2. Explain the two types of welding machines.
   3. Show how to set current and polarity.
4. Consider electrodes and how they are used with different polarities.
   1. Study video #3 and complete workbook assignment.
   2. Relate how electrode size is determined. 
   3. Explain the numbers on the electrodes as to what they mean.
   4. Identify the characteristics for each electrode.
5. Weld in GMAW process in the flat and vertical position with a 6” backing strip.
   1. Prepare 3/8” x 5” x 5” plate with 45 degree included angle bevel with line cutter.
   2. Set up 3/8” x 5” x 5” plate with 1/4” root opening and 1/4” x 1” x 6” backup strip.
   3. Position 3/8” x 5” x 5” plate in the flat and vertical up positions and weld groove complete.
   4. Cut 1” off each end of plate after welded, grind each end to smooth finish.
   5. Remove back up strip with Oxy-Acetylene rivet cutting tip and grind root and face of plate flush.
   6. Measure and mark remaining 3” piece in half and cut with band saw and grind 1/8” chamfer on corners.
6. Operate guided bend tester, bend 3/8” x 1 1/2” x 10”, one face bend and the other root bend
   1. Review each piece to see that there is no defect over 1/8” in any direction
   2. Complete lab test over flat and horizontal for final grade