WEL 1035 - Gas Metal Arc Welding

• Identify the modes of GMAW transfer, including short-circuiting transfer, axial-spray transfer and globular transfer 

• Describe the advantages of pulse-arc waveforms for controlled heat and penetration applications 

• Identify the common shielding gases and gas mixtures and the reasons for the matching gas mixtures to the transfer mode being performed 

• Identify and select the proper size and class of GMAW filler wire for a given application 

• Explain how wire-feed rates are measured and the effects of wire-feed rates on weld deposition rates and how Voltage/Wire-feed rates determine welding amperage of CV power sources 

• Describe the term stringer-bead and weave-bead and the defining characteristics of both 

• Demonstrate how to perform a stringer bead on plate steel using short-circuiting transfer 

• Describe the term “dig and fill”, and the variations of dig and fill weld puddle 

• Describe how manipulating the molten weld puddle can affect penetration, heat control and weld bead aesthetics 

• Demonstrate how to perform a “dig and fill” manipulated weld bead on plate steel using short circuiting transfer 

• Demonstrate how to perform single pass fillet welds on lap-joints and Tee-joints in the 1F and 2F positions using short-circuiting transfer 

• Demonstrate how to perform multi-pass fillet welds on Tee-joints on the 2F position using short-circuiting transfer 

• Demonstrate how to perform open-root, square groove butt joints in the 1G and 2G positions using short-circuiting transfer 

• 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 

• Demonstrate how to perform single pass fillet welds on lap-joints and Tee-joints in the 3F and 4F positions using GMAW-S (Short-Circuit transfer MIG) 

• Demonstrate how to perform open-root, square groove butt joint welds in the 3G and 4G positions using GMAW-S (Short-Circuit transfer MIG) 

• 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 using FCAW-G (Dual Shield Flux core) in the 1G position 

• Demonstrate how to perform a multi-pass weld on a single Vee, butt-joint coupon with backing using Axial-Spray transfer GMAW (Spray arc MIG) in the 1G position 

• Demonstrate how to lay-out and saw welded coupon straps for guided bend tests 

• Demonstrate how to remove backing from coupon straps with oxy-fuel torch prior to guided bend testing 

• Demonstrate how to perform ASME Section IX style mock-flange welds on a welding positioner in the 5F position using Axial-Spray transfer GMAW 

• Demonstrate how to perform fillet welds on lap-joints and Tee-joints in the 2F position using Aluminum GMAW 

• Explain the differences between a spool-gun and a push-pull gun for Aluminum GMAW 

• Explain the differences in cost and application selection for FCAW processes and GMAW processes 

• Explain the thickness limitations for GMAW-S and Axial-Spray Transfer GMAW 

Print Reading: 

• List the various common lines found in welding blueprint and technical drawings 

• Define the terms “Point of Origin” and “Centerline” 

• Explain the use of solid lines and hidden lines to display references on technical drawings 

• Explain why multiple views of the same weldment are often shown on technical drawing, describe how it is beneficial to have several reference views on a complex technical drawing 

• Discuss why isometric views usually do not have measurements 

• Discuss multiple pages are needed to show the full range of details/measurements of a complex weldment  

• Explain why technical drawings often have revisions and where to locate revision numbers on a drawing 

• Explain how to convert a fraction to a decimal equivalent  

• Explain the formula to convert a standard measurement into a metric value 

• List the various welding symbols found in welding blueprint and technical drawings 

• Define the most common welding symbols for fillet and groove welds 

• Explain and identify the parts of a welding symbol  

• Define the terms “arrow side” and “other side” 

• Discuss the use of a symbol tail and how welder-specific instructions are listed using the tail feature