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FAB3170 Gas Metal Arc Welding 2

Advanced · 1 credit · TMT - Trades, Manufacturing and Transportation

Description
Students develop skills to evaluate and improve the quality of gas metal arc weldings, and they extend their Gas Metal Arc Welding (GMAW) skills by performing horizontal and vertical groove welds.
Prerequisite
FAB2070: Gas Metal Arc Welding 1
Parameters
Access to a fabrication work centre, complete with GMAW equipment and supplies, and to instruction from an individual with welding trade qualifications.

Outcomes The student will:

  • 1 identify variables that affect the quality of gas metal arc welds and identify strategies to evaluate and improve weld quality

    • 1.1 identify the variables that can directly affect weld quality; e.g., the welding current and voltage, type of shielding gas/flux, diameter and type of filler metal, type and condition of equipment, welding technique

    • 1.2 select the appropriate shielding gas mixture based on:

      • 1.2.1 mode of metal transfer

      • 1.2.2 base metal type and thickness

      • 1.2.3 joint design

      • 1.2.4 filler material

      • 1.2.5 desired weld quality

    • 1.3 describe how to select the type and size of filler metal

    • 1.4 explain how to avoid contamination of filler materials

    • 1.5 identify the relationship between:

      • 1.5.1 wire speed and amperage

      • 1.5.2 welding voltage and arc length

    • 1.6 describe the effects of:

      • 1.6.1 backhand or pull welding

      • 1.6.2 forehand or push welding

    • 1.7 describe the effects of torch angle on:

      • 1.7.1 weld penetration

      • 1.7.2 weld appearance

    • 1.8 complete a visual inspection, i.e., non-destructive test, by observing and assessing:

      • 1.8.1 overall size, shape and appearance of beads

      • 1.8.2 plate penetration

      • 1.8.3 fusion

      • 1.8.4 degree of undercutting and overlapping

    • 1.9 perform a destructive test, where appropriate

  • 2 perform safe set-up, maintenance and troubleshooting procedures with GMAW equipment

    • 2.1 apply safe work practices and procedures to:

      • 2.1.1 select and use appropriate personal protective equipment

      • 2.1.2 maintain a clean and tidy work station

      • 2.1.3 demonstrate safe tool/material handling and storage techniques

    • 2.2 for a given type of weld and/or weldment, select the appropriate:

      • 2.2.1 wire type, size and feed rate

      • 2.2.2 current

      • 2.2.3 shielding gas type and flow rate

    • 2.3 select the proper fit-up for a given weld

    • 2.4 describe corrective actions that can be taken to avoid:

      • 2.4.1 surface porosity

      • 2.4.2 subsurface porosity

      • 2.4.3 lack of fusion

      • 2.4.4 burn-through

      • 2.4.5 lack of penetration

      • 2.4.6 cold lapping

    • 2.5 identify problems common to out-of-position welding

    • 2.6 perform maintenance required for wire drive systems and gun assemblies

    • 2.7 diagnose and demonstrate corrective measures for malfunctioning GMAW equipment

  • 3 demonstrate safe GMAW practices to perform groove welds on mild steel plate in the horizontal and vertical positions

    • 3.1 describe safety issues related to:

      • 3.1.1 using personal protective equipment

      • 3.1.2 handling and storing consumables

      • 3.1.3 keeping the welding area free of hazards

      • 3.1.4 ensuring adequate ventilation

    • 3.2 describe a safety plan in case of an accident

    • 3.3 prepare and clean all surfaces to be welded

    • 3.4 properly position metal for welding

    • 3.5 demonstrate safe GMAW techniques and perform groove welds in the horizontal and vertical positions on mild steel plate

  • 4 demonstrate basic competencies

    • 4.1 demonstrate fundamental skills to:

      • 4.1.1 communicate

      • 4.1.2 manage information

      • 4.1.3 use numbers

      • 4.1.4 think and solve problems

    • 4.2 demonstrate personal management skills to:

      • 4.2.1 demonstrate positive attitudes and behaviours

      • 4.2.2 be responsible

      • 4.2.3 be adaptable

      • 4.2.4 learn continuously

      • 4.2.5 work safely

    • 4.3 demonstrate teamwork skills to:

      • 4.3.1 work with others

      • 4.3.2 participate in projects and tasks

  • 5 create a transitional strategy to accommodate personal changes and build personal values

    • 5.1 identify short-term and long-term goals

    • 5.2 identify steps to achieve goals

Program of Studies 2009. Source document, © Alberta Education.