Objective 03: Welding Type Symbols

Question 1

What is the purpose of Weld Symbols?

Answer 1

They are tagged unto welding symbols to tell the welder what type of weld to perform

Question 2

What is additional information that some weld symbols also provide?

Answer 2

The preparation required of the surfaces before welding can begin.

Question 3

What does this Weld Symbol represent?

Answer 3

V weld

Question 4

What does this Weld Symbol represent?

Answer 4

Bevel Weld

Question 5

What does this Weld Symbol represent?

Answer 5

Straight Weld

Question 6

What does this Weld Symbol represent?

Answer 6

U Weld

Question 7

What does this Weld Symbol represent?

Answer 7

J Weld

Question 8

What does this Weld Symbol represent?

Answer 8

Flare V Weld

Question 9

What does this Weld Symbol represent?

Answer 9

Flare Bevel Weld

Question 10

What does this Weld Symbol represent?

Answer 10

Scarf Weld

Question 11

What does this Weld Symbol represent?

Answer 11

Fillet Weld

Question 12

What does this Weld Symbol represent?

Answer 12

Plug or Slot Weld

Question 13

What does this Weld Symbol represent?

Answer 13

Stud

Question 14

What does this Weld Symbol represent?

Answer 14

Spot or Projection Weld

Question 15

What does this Weld Symbol represent?

Answer 15

Seam Weld

Question 16

What does this Weld Symbol represent?

Answer 16

Back or Backing Weld

Question 17

What does this Weld Symbol represent?

Answer 17

Surfacing Weld

Question 18

What does this Weld Symbol represent?

Answer 18

Edge Weld

Question 19

Stud Weld

Answer 19

Small stud attached via welding to a surface either perpendicular or at an angle

Question 20

How is a Stud Weld produced?

Answer 20

The welding current flows directly through the stud, rather than a welding rod, causing the stud to fuse directly to the surface

Question 21

Spot Weld

Answer 21

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.

Question 22

How does a Projection Weld differ from a Spot Weld?

Answer 22

One of the surfaces has small raised projections, which slightly separate the surfaces, but concentrate the welding heat and fusion at the projection points

Question 23

Seam Weld

Answer 23

Continuous weld applied to relatively thin materials where the materials butt or overlap to form a long seam

Question 24

How are Seam Welds produced?

Answer 24

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

Question 25

Back Weld

Answer 25

Weld applied to the back side (root side) of a single-groove weld after the main weld has been completed.

Question 26

What is the purpose of a Back Weld?

Answer 26

To reinforce the weld and fill in where the main weld did not fully penetrate the groove.

Question 27

Backing Weld

Answer 27

A weld applied to the back side (root side) of a single-groove weld before the main weld is started

Question 28

What is the purpose of a Backing Weld?

Answer 28

To fill the root opening and prevent melt through of the main weld

Question 29

Surfacing Weld

Answer 29

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

Question 30

What are 2 common applications of Surfacing Welds?

Answer 30

1. Replace metal that was lost due to corrosion
2. Intentionally thicken a surface in anticipation of corrosion

Question 31

Edge Weld

Answer 31

Weld used to join 2 pieces along their adjacent, exposed edge, with or without bevelling