Chapter 12 57 Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website. Name ________________________________________________________________ Date ________________________ Class ________________ Assigned Job 12-3 Welding a T-Joint in the Flat Welding Position OBJECTIVE: In this job, you will learn to make an acceptable fillet weld on a T-joint in the flat welding position. Do not attempt this job until: • •• You have read all safety precautions. •• You have satisfactorily completed the Shielded Metal Arc Welding (SMAW) Safety Test. • You have received permission from your instructor. NOTE 1. Obtain four pieces of low-carbon steel that measure 1/4″ × 1 1/2″ × 6″ (6 mm × 40 mm × 150 mm) and two pieces that measure 1/4″ × 3″ × 6″ (6 mm × 75 mm × 150 mm). You will also need six 1/8″ diameter E6012 electrodes. 2. Answer the following questions: A. What amperage range is suggested for the E6012 electrode? Refer to Figure 11-9 in the text. _ ________________________________________ amperes B. What is the correct polarity for this electrode? Refer to Figure 11-6 in the text. _ ________________________________________________ 3. Set the machine amperage for the middle of the recommended range. Set the polarity also. 4. Make a few practice welds to adjust the machine for the best weld beads. 5. Arrange one of the large pieces and one of the small pieces as shown in the following illustration. Tack the weldment in three places about 3″ (75 mm) apart. The tack welds may be made with the welds in the horizontal welding position. 1 1/4 1/4 in. mm 1/4 1 6 25 6. After cleaning the tack welds, arrange the pieces so that the welding can be done in the flat welding position. 7. See Figure 12-17 in the text for the correct electrode angles to use when welding a fillet weld on a lap joint in the flat welding position. 8. Make the fillet welds indicated in the drawing for step 5. Weld in the flat position. 9. Clean each weld bead by chipping and wire brushing.