Objective 03: Welding Type Symbols Flashcards
What is the purpose of Weld Symbols?
They are tagged unto welding symbols to tell the welder what type of weld to perform
What is additional information that some weld symbols also provide?
The preparation required of the surfaces before welding can begin.
What does this Weld Symbol represent?
V weld
What does this Weld Symbol represent?
Bevel Weld
What does this Weld Symbol represent?
Straight Weld
What does this Weld Symbol represent?
U Weld
What does this Weld Symbol represent?
J Weld
What does this Weld Symbol represent?
Flare V Weld
What does this Weld Symbol represent?
Flare Bevel Weld
What does this Weld Symbol represent?
Scarf Weld
What does this Weld Symbol represent?
Fillet Weld
What does this Weld Symbol represent?
Plug or Slot Weld
What does this Weld Symbol represent?
Stud
What does this Weld Symbol represent?
Spot or Projection Weld
What does this Weld Symbol represent?
Seam Weld
What does this Weld Symbol represent?
Back or Backing Weld
What does this Weld Symbol represent?
Surfacing Weld
What does this Weld Symbol represent?
Edge Weld
Stud Weld
Small stud attached via welding to a surface either perpendicular or at an angle
How is a Stud Weld produced?
The welding current flows directly through the stud, rather than a welding rod, causing the stud to fuse directly to the surface
Spot Weld
When 2 relatively thin surfaces are forced tightly together and electrodes, directly across from each other and on opposite sides of the surface, send enough current through the materials to melt and fuse the metals at the spot.
How does a Projection Weld differ from a Spot Weld?
One of the surfaces has small raised projections, which slightly separate the surfaces, but concentrate the welding heat and fusion at the projection points
Seam Weld
Continuous weld applied to relatively thin materials where the materials butt or overlap to form a long seam
How are Seam Welds produced?
Electrodes, usually in the form of wheels, press the pieces together from opposite sides and travel along the seam, applying current between them to melt and fuse the pieces together
Back Weld
Weld applied to the back side (root side) of a single-groove weld after the main weld has been completed.
What is the purpose of a Back Weld?
To reinforce the weld and fill in where the main weld did not fully penetrate the groove.
Backing Weld
A weld applied to the back side (root side) of a single-groove weld before the main weld is started
What is the purpose of a Backing Weld?
To fill the root opening and prevent melt through of the main weld
Surfacing Weld
A weld simply laid down on a single surface for the purpose of strengthening or increasing the thickness of the surface, with no joining of pieces
What are 2 common applications of Surfacing Welds?
- Replace metal that was lost due to corrosion
- Intentionally thicken a surface in anticipation of corrosion
Edge Weld
Weld used to join 2 pieces along their adjacent, exposed edge, with or without bevelling
