Mar 28, 2024  
Course/Program Inventory 
    
Course/Program Inventory

WEL 2025 - Basic Gas Tungsten Arc Welding



Clock Hours: 100

Delivery Mode
on-ground

Course Description:
The goal of this course is the introduction of Gas Tungsten Arc Welding related theory and practices for the joining of carbon steel plate. Fillet and groove welds are performed in the Flat and Horizontal positions, using various electrodes and graded by AWS D1.1 criteria for visual testing

Student Learning Outcomes:
Students will be able to demonstrate knowledge of:

  • Describe the gas GTAW process and equipment
  • Explain the characteristics of Tungsten that allow it to be used as an electrode in GTAW
  • Explain why the Tungsten must be shaped on the end by grinding, and how the point preparation is important to the GTAW process
  • Discuss the various types of Tungsten alloy electrodes available for GTAW
  • Demonstrate how to properly grind a point on the end of a new Tungsten electrod
  • Explain the difference between air-cooled and water-cooled GTAW/TIG torches and the advantages/disadvantages of both
  • Explain the reason there is a coolant circulating hose and a coolant-recirculating, return hose on a water cooled GTAW torch
  • Discuss the need for various available sizes of GTAW gas nozzle
  • Define the term Gas-lens and the advantages of using one for GTAW torches 
  • Discuss gas flow rates, gas flow turbulence, and the Venturi effect
  • Demonstrate how to properly identify recommended regulator gas flow rates from a chart to a corresponding nozzle opening size
  • Demonstrate how to set the flow rate at the shielding gas regulator 
  • Explain what type of welding current is needed for GTAW of carbon and stainless steels
  • Explain what type of welding current is needed for GTAW of Aluminum and Bronze/Brass
  • Define “Dabbing”, “Lay-Wire”, “Freehand Weave” and “Walking the Cup” techniques
  • Demonstrate performing a single pass bead on steel plate using a Dabbing technique in the Flat positon
  • Demonstrate performing a single pass bead on steel plate using a Laywire technique in the Flat position 
  • Demonstrate how to perform single pass Fillet weld on Lap-joints and Tee-joints in the 1F and 2F positions
  • Demonstrate how to perform multi-pass Fillet weld on Tee-joints in the 2F positions
  • Demonstrate how to perform open-root, square groove butt joint welds in the 1G and 2G positions
  • Demonstrate how to prepare a beveled surface on plate steel coupons
  • Demonstrate how to properly set-up and tack weld a single Vee, butt-joint coupon with backing
  • Demonstrate how to perform a multi-pass weld on a single Vee, butt-joint coupon with backing