PIPE WELDER (TIG & MMAW)
Name of Sector Fabrication Name of Module Pipe Welder (TIG & MMAW)
Minimum Age 18 Years Duration of Course 3 Months
ADU Code FAB 708

Degree in Mechanical Engineering with one year Experience

(OR)

Diploma in Mechanical Engineering with two year Experience

(OR)

NTC/ NAC in Welder Trade Group with three years of Experience



Weld high pressure pipes in 5G and 6G positions by MMAW

Weld high pressure pipes in 5G and 6G positions by TIG root pass and cover pass by MMAW



Practical Competencies Underpinning Knowledge (Theory)
  • Use of protective safety devices on shop floor.
  • Safe working practice to be observed during welding.
  • Introduction to safety equipment and their uses.
  • Setting up of Arc Welding plants
  • Striking and making straight and weaving beads in all position by MMAW.
  • Produce arc welded joints:
  • a. Filler "T" joint on M.S. flat by MMAW in 1F, 2F, 3F and 4F positions

    b. Fillet lap joint on M.S. by MMAW in flat position

    c. Outside corner joint on MS by MMAW in flat position

    d. Single "V" but joint on MS by MMAW in 1G, 2G, 3G and 4G positions

  • Preparation of pipe joint for pipe welding
  • Produce Single "V" butt joint on 6"schedule 60 mild steel pipe in down hand position (1G) by MMAW.
  • Produce Single "V" butt joint on 6" schedule 60 mild steel pipe in horizontal position (2G) by MMAW (pipe axis vertical).
  • Produce Single "V" butt joint on 6" schedule 60 mild steel pipe in 5G position (uphill) by MMAW (pipe axis horizontally fixed)
  • Produce Single "V" butt joint on 6"schedule 60 mild steel pipe in 6G position (uphill) by MMAW (pipe axis 45degree inclined) – fixed
  • Setting up of Arc Welding and TIG Welding plants
  • Striking and making straight g beads in all position by TIG.
  • Root welding of pipes in 5G position by TIG Welding
  • Intermediate and cover pass welding in 5G position by SMAW
  • Root welding of pipes in 6G position by TIG
  • Intermediate and cover pass welding in 6G position by MMAW
  • Identification of defects by Visual inspection & correction of defects
  • Introduction of MES scheme
  • Job /employment opportunity
  • Introduction to welding.
  • Types of welding processes and application
  • Nomenclature of Fillet and groove welds
  • Welding terms and definitions.
  • Introduction to pipe welding.
  • Principles of Manual Metal Arc Welding (MMAW).
  • Types of power source, Polarity and its effects.
  • Types of Arc length and application
  • Welding positions and importance
  • Types of Electrodes and specification as per BIS, AWS, etc.
  • Selection of electrodes
  • Electrode storage and backing temperature
  • Preheating requirement for alloy steel pipe welding
  • Types of pipes and pipe schedule
  • Edge preparation and fit up for thick wall and thin wall pipes.
  • Basic pipe welding procedure – uphill welding and downhill welding.
  • Pipe welding position 1G, 2G, 5G & 6G
  • Procedure for welding thin wall pipes
  • Procedure for welding thick wall pipes in 1G position
  • Procedure for welding thick wall pipes in 2G position
  • Procedure for welding thick wall pipes in 5G position
  • Procedure for welding thick wall pipes in 6G position
  • Welding Symbols and reading of pipe fabrication drawings
  • Introduction to TIG welding
  • Advantages of TIG welding process
  • Power source – Types, polarity and application
  • Accessories - HF unit and DC suppressor.
  • Tungsten electrode, Types, sizes, and uses.
  • Type of shielding gases
  • Advantages of root pass welding of pipes by TIG welding
  • Types of pipes and pipe schedule
  • Inspection & testing of weldments