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Adjusting And Setup of Welding

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Penetration Extent to which weld metal combines with base metal as measured ... Porosity Condition caused by a trapped gas pocket in a weld as it solidifies. ... – PowerPoint PPT presentation

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Title: Adjusting And Setup of Welding


1
Adjusting And Setup of Welding Cutting
Equipment Jerry Taylor
August 2009
2
Terms And Definitions
  • Arc Welding Process of using an electric arc as
    the source of heat to join two or more pieces of
    metal by the fusion process.

3
Terms and Definitions
  • Arc flow of electric current across a narrow
    gap.

4
Terms and Definitions
  • Base metal metal to be welded.

5
Terms and Definitions
  • Flux Chemical coating on electrodes used to
    promote fusion of metals during welding.

6
Terms and Definitions
  • Bead Weld Weld made by one pass of the
    electrode.

7
Terms and Definitions
  • Pad piece of practice metal on which parallel
    beads are deposited side by side.

8
Terms and Definitions
  • Tack Weld Small weld used to hold base metals
    together temporarily.

9
Terms and Definitions
  • Penetration Extent to which weld metal combines
    with base metal as measured from surface of base
    metal.

10
Terms and Definitions
  • Crater Depression in face of a weld, usually at
    point where weld stopped.

11
Terms and Definitions
  • Slag Nonmetallic by-product of welding process
    made of flux and nonmetallic impurities.

12
Terms and Definitions
  • Tensile Strength Maximum pull stress in pounds
    per square inch that a weld specimen can
    withstand.

13
Terms and Definitions
  • American Welding Society (AWS) One of many
    associations and societies that establish codes
    and / or standards for the welding industry.

14
Terms and Definitions
  • Weld Face Exposed surface of a fusion weld.

15
Terms and Definitions
  • Root Bottom surface of a weld the opposite
    side from which the welding was done.

16
Terms and Definitions
  • Undercutting Portion of the crater left
    unfilled due to excessive current and the
    improper movement of the electrode.

17
Terms and Definitions
  • Spatter Deposit of small spots or particles of
    metal on the base metal long side of the bead.

18
Terms and Definitions
  • Porosity Condition caused by a trapped gas
    pocket in a weld as it solidifies.

19
Terms and Definitions
  • Slag Inclusion Nonmetallic porous material
    entrapped in weld metal or between the weld metal
    and base metal.

20
Terms and Definitions
  • Cold lap Piling up of weld metal due to
    improper starts and current adjustments causing a
    defect usually at the start of a weld.

21
Terms and Definitions
  • Arc Blow Concentration of magnetic force acting
    on the welding arch causing it to deflect, move,
    or blow from its normal path.

22
Kinds of shielded metal Arc Welding Machines
  • Alternating Current (AC) Machine that
    alternates direction of flow of electric current
    120 times per second.

23
Kinds of shielded metal Arc Welding Machines
  • Direct Current (DC) machine in which the electric
    current flows in one direction.

24
Kinds of shielded metal Arc Welding Machines
  • Alternating / direct current (AC/DC) Machine
    that is capable of supplying AC or DC current for
    welding.

25
Common Arc Welding Equipment
  • Welding Machine
  • Electrode holder with lead

26
Common Arc Welding Equipment
  • Ground clamp with lead
  • Welding Helmet

27
Common Arc Welding Equipment
  • Leather Gloves
  • Chipping Hammer

28
Common Arc Welding Equipment
  • Eye Protection
  • Wire Brush

29
Common Arc Welding Equipment
  • Electrodes

30
Meanings of Characters in the AWS Electrode
Classification System
  • Tensile
  • Strength
  • (Thousands Welding
  • of pounds Position
  • Electrode Welding
    Current

  • And / Or Depth Of

  • Penetration
  • E 6012
  • 1. Letter E denotes that electrode is for arc
    welding.
  • 2. First two numerals indicates tensile
    strength in thousands of pounds per square inch.
  • 3. Third numeral indicates position to be used.
  • 4. Fourth numeral gives code for special
    characteristics of electrode.

31
Purposes Of Flux
  • 1. Stabilizes arc
  • 2. Shielding molten puddle from air.
  • 3. Floating impurities out of puddle.
  • 4. Forming slag, which slows cooling.
  • 5. Increasing speed.

32
Methods of establishing arc
  • 1. Scratching (similar to striking a match)
  • 2. Tapping

33
Characteristics of proper arc length
  • 1. End of electrode is same distance from base
    metal as diameter of electrode.
  • 2. Steady hum from welding machine and frying
    sound at the arc.

34
Kinds of Welds
  • Fillet Weld

35
Kinds of Welds
  • Groove Welds

36
Kinds of Welds
  • Bead Weld

37
Types of Weld Joints
Butt joint- a joint between two members aligned
approximately in the same plane.
Edge joint- a joint between the edges of two or
more parallel or nearly parallel members.
38
Types of Weld Joints
T- joint - a joint between two members located
approximately at right angles to each other in
the form of a T.
Corner joint - a joint between two members
located at right angles to each other.
39
Types of Weld Joints
Lap Joint- a joint between two overlapping
members.
40
Arc Welding Safety
  • 1. Always weld in a well ventilated area. If
    proper ventilation is not available, go outside.
  • 2. Always use a helmet or hand shield that is in
    good condition when welding. If the lens is bad,
    cracked, or broken replace it before welding. Use
    at least a 10 shade lens for electric arc
    welding.

41
Arc Welding Safety
  • 3. Never look at a welding arc with the naked
    eye.
  • 4. Do not strike an arc until you are sure those
    in the vicinity have protective equipment or have
    turned their eyes away from the arc.

42
Arc Welding Safety
  • 5. use eye protection when chipping slag from a
    weld.
  • 6. Always wear suitable clothing (long sleeves,
    gloves, heavy pants, heavy boots) to protect the
    body from arc burns and spatter of hot metal.

43
Arc Welding Safety
  • 7. Don not weld around combustible materials.
  • 8. Do not weld on containers that may contain
    combustible substances.
  • 9. Do not change welding amperage when the
    circuit is closed.

44
Arc Welding Safety
  • 10. Do not leave electrode holder on the table or
    in contact with a grounded metal surface.
  • 11. Never leave the machine when the circuit is
    closed.
  • 12. Do not use the welder on or around wet
    surfaces.

45
Arc Welding Safety
  • 13. Place hot electrode stubs in a metal
    container for disposal. Never throw them on the
    floor.
  • 14. Make sure all connections are tight before
    welding.
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