Weld%20Joints

1
Weld Joints
2
Butt Joint
3
Corner Joint
Outside
Inside
4
Edge Joint
5
T Joint
6
Lap Joint
7
Electrode Classification
8
Electrode s
Tensile Strength 60 60,000 psi 70 70,000
psi 80 80,000 psi 90 90,000 psi
Welding Position 1 All Positions 2
Flat/Horizontal 3 Flat Only
Special Characteristics 0 Deep/DC / Fast
Freeze 1 Deep/AC/DC / Fast Freeze 3 Shallow
/AC/DC/DC- 8 Medium / AC/DC/Low Hydro
9
X 1000 lbs sq inch Tensile Strength

• Special Characteristics
• Current Type
• Flux Characteristics
• Metal Type
• Penetration

Electrode
E 60 1 1
Position
10
E 60 11

• Special Characteristics
• Deep Penetration
• Cellulose Potassium flux
• Fast Freeze
• AC/DC (current)

60,000 psi
Electrode
E 60 1 1
All Position
11
E 60 1 0

• Special Characteristics
• Deep Penetration
• Cellulose sodium flux
• Fast Freeze
• DC (current)

60,000 psi
Electrode
E 60 1 0
All Position
12
E 70 1 8

• Special Characteristics
• Medium Penetration
• Iron Powder Low Hydrogen flux
• AC/ DC (current)

70,000 psi
Electrode
E 70 1 8
All Position
13
E 60 1 3

• Special Characteristics
• Shallow Penetration
• Titania Potassium flux
• AC / DC / DC - (current)

60,000 psi
Electrode
E 60 1 3
All Position
14
Electrode s Quiz Slide
E
80
80,000 psi tensile strength
2
Flat/Horizontal Position
1
Fast Freeze Deep Penetration AC/DC
Electrode
Tensile Strength 60 60,000 psi 70 70,000
psi 80 80,000 psi 90 90,000 psi
Welding Position 1 All Positions 2
Flat/Horizontal 3 Flat Only
Special Characteristics 0 Deep/DC / Fast
Freeze 1 Deep/AC/DC / Fast Freeze 3 Shallow
/AC/DC/DC- 8 Medium / AC/DC/Low Hydro
Low Hydrogen Flux Medium Penetration AC/DC
E
60
60,000 psi tensile strength
3
Flat Position Only
8
Electrode
15
Welding Terminology
16
Arc Length

• Distance between the tip of the electrode and the
  base metal. Also known as Arc Gap.
• Long Arc large Gap
• Short Arc Small Gap
• Shorter the Gap Cooler the Arc
• Longer the Gap Hotter the Arc

17
Shielding Gases

• Carbon Dioxide (C02)
• Co2/Argon Mix (Mixed Gas)
• 75/25
• 85/15
• 90/10

18
Wire Speed

• Speed in Inches Per Minute (IPM) that the wire
  spools through lead cable out the nozzle.
• Changes the Amp in the Circuit (Current)

19
Wire Stick-out

• Distance the wire protrudes past electrode
  tip/nozzle
• Can
• Increase spatter (Too long or short)
• Burn tip/wire together (create too much
  resistance)
• Be adjusted to get smooth current (Volts/Amps)

20
Gun Angle

• Angle the Gun/Tip is held from the base metal
• 1)Base Angle (BA)
• 2)Direction of Travel Angle (DOTA)

21
Forehand/backhand

• Forehand Pushing the puddle
• 80 Degree Push
• Backhand Dragging puddle
• 80 Degrees DOT.

22
Porosity

• Gas Pocket in/on the weld that is a defect in the
  weld.
• Causes
• Long arc
• Dirty base metal
• Shielding Gas Off (needs to be 20 CF)
• Gas Off
• To Low of Pressure
• To High of Pressure (causes Turbulence)
• Wind/Weather

23
Fusion

• Combining or joining of two materials

24
Non Ferrous

• Metal that does not contain Iron
• Example Aluminum/Copper, brass, lead, nickel,
  tin, titanium

25
Ferrous Metal

• Metal containing Iron
• Example mild steel Metal/Stainless, carbon
  steel/AR plate

26
Welding Electrical Terms
27
Electrical Terms

• 12. The arc is extinguished every half-cycle as
  the current passes through zero, usually at the
  rate of 120 times per second.

28
Alternating Current

• Current (electrons) is traveling in both
  directions back and forth.
• Current is changing from positive-Negative
• Hertz sign wave electrical current

29
DC Current

• DC Direct Current
• Current is traveling in one direction
• Polarity Changing direction current flows
• Ground to Electrode or Electrode to ground

30
DC Polarity

• DC electrode is Positive and electrons will
  flow from neg to pos therefore will go from neg
  Ground to positive electrode. Reverse
  polarity/DCEP/DC
• DC - Electrode is negative and electrons will
  flow from Neg to positive therefore go to the
  positive ground clamp. Straight
  polarity/DCEN/DC-

31
Amps

• The measure of Electrical Flow
• 1) electrons traveling
• 2) Water running out of a garden hose would be
  compared to Amps
• 3) Water Flow/Electrical Flow

32
Volts

• Measure of Electrical Pressure
• 1) Force of electrons
• 2) Compared to your finger over a running garden
  hose to generate more pressure.
• 3) water pressure/Electrical pressure

33
CC

• Constant Current
• Amps (Current) stays constant (Vary Slightly)
  and there are change in voltage during welding
  process.
• ?? What changes Voltage?
• Typical processes SMAW/GTAW

34
CV

• Constant Voltage
• Voltage stays constant (Varies slightly) and
  there are changes in Current (Amps) during
  welding process.
• ?? What changes Amperage?
• Typical processes GMAW

35
(No Transcript)
36
Weld Pattern/Movement
37
(No Transcript)
38
(No Transcript)
39
Out of position Welding
40
D. There are four positions used when welding

• Overhead

41
D. There are four positions used when welding

• Horizontal

42
D. There are four positions used when welding

• Vertical

43
D. There are four positions used when welding

• Flat
• The flat position produces welds that are
  stronger than in any other position.

44
Base metal Prep
45
9. The double V butt joint is excellent for all
load conditions and is often used on metal
sections over ¾ inch in thickness.
46
7. The single V butt joint is often used on plate
steel 3 /8 inch to ¾ inch in thickness. This
joint is strong in loads with tension forces but
weak in loads that bend at the weld root. The
weld root is the bottom of the weld groove
opposite the weld face.
47
8. The single-bevel butt joint is used on metals
from 1/8 inch to ½ inch in thickness and the
bevel is 45 degrees.
48
4. The plug and slot welds are used to join
pieces that overlap. The welds are placed in plug
or slot holes. These types of welds commonly take
the place of rivets in welded structures.
49
GMAW Gas Metal Arc Welding
50
GMAW Spool Roller GuidesTensioner
51
Wire irregularly fed (rat or bird nest)
52
GMAW Machine/equipment
53
GMAW Torch Parts
54
GMAW Shielding Action
55
GMAW Nozzle/Gun parts
56
GMAW welding
57
Flow meter
58
PAC Plasma Arc Cutting
59
(No Transcript)
60
(No Transcript)
61
(No Transcript)
62
Brands Of plasma Cutters
63
(No Transcript)