WELD 2650 Gas Tungsten Arc Welding Pipe

This course provides training in Gas Tungsten Arc Welding (GTAW) to produce quality welds on carbon steel pipe. The student will weld on 8-inch, schedule 40 pipe in the 1G, 5G, and 6G positions. The student will weld the pipe coupons with ER 70S-2 welding rod. The student will also weld a combination weld using ER 70S-2 and E 7018. For this welded coupon both GTAW and Shielded Metal Arc Welding (SMAW) welding process will be used. All submitted welded coupons will be destructive tested to The American Welding Society pipe standards using the bending machine in the lab. (2 lect., 4 lab)

Credits

4 credits

Major Topics

• Safety in the welding shop while arc welding
• Awareness of the dangers using compressed argon gas cylinders
• Introduction to Gas Tungsten Arc Welding (GTAW) and Shielded Metal Arc Welding (SMAW) on pipe
• Gas Tungsten Arc Welding and Shielded Metal Arc Welding processes
• Equipment set-up and break down

Outcomes

In order to successfully complete this course, the student will:

1. Demonstrate safe working habits in the welding shop using the Gas Tungsten Arc Welding (GTAW) and Shielded Metal Arc Welding (SMAW) processes.

2. Prepare pipe coupons for GTAW welding using a feathered edge.

3. Perform GTAW pipe welding using the lay wire and back feeding techniques to establish a root bead.

4. Evaluate welds for common root bead defects.

5. Repair root bead defects using the GTAW process.

6. Demonstrate welding the hot pass and filler passes using the "Walking the Cup " technique.

7. Demonstrate welding the hot pass and filler passes with the SMAW process.

8. Evaluate welds for common defects that may occur in GTAW and SMAW processes.

9. Repair defects associated with GTAW and SMAW processes.

10. Evaluate pipe coupons for heat distortion and mitigation options using metallurgical principles.