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The document discusses welding symbols and their components. It defines key elements such as the reference line, arrow, and tail. The reference line must always be horizontal and the arrow points to the proposed weld area. The tail indicates welding processes and specifications. Basic components include the reference line, arrow connecting it to the joint, and a circle or flag. The document provides examples of different weld symbols like fillet welds, groove welds, and intermittent welds showing size, depth, and other details. It defines terminology used in welding symbols.
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Welding is a method of permanently joining metal parts. There are different types of welded joints and standardized welding symbols are used on drawings to indicate how parts should be welded together. The symbols provide information on the type of weld, location of the weld, size of the weld, whether welding is required on one or both sides of the joint, and other details. Proper interpretation and application of welding symbols is important for ensuring parts are welded correctly.
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Types
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There are many types of butt welds, but all fall within one of these categories: single-welded butt joints, double-welded butt joint, and open or closed butt joints. A single welded butt joint is the name for a joint that has only been welded from one side. A double-welded butt joint is created when the weld has been welded from both sides. With double welding, the depths of each weld can vary slightly. A closed weld is a type of joint in which the two pieces that will be joined are touching during the welding process. An open weld is the joint type where the two pieces have a small gap in between them during the welding process.
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The square groove is a butt welding joint with the two pieces being flat and parallel to each other. This joint is simple to prepare, economical to use, and provides satisfactory strength but is limited by joint thickness. The closed square butt weld is a type of square-groove joint with no spacing in between the pieces. This joint type is common with gas and arc welding. For thicker joints, the edge of each member of the joint must be prepared to a particular geometry to provide accessibility for welding and to ensure the desired weld soundness and strength. The opening or gap at the root of the joint and the included angle of the groove should be selected to require the least weld metal necessary to give needed access and meet strength requirements. Only metal up to 4.5mm thick is usually used for square butt joints.
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Describe type of welding joint design and welding symbols that usually used in welding design
After completing this chapter, the student should be able to
understand the basics of joint design.
list the five major types of joints.
list seven types of weld grooves.
identify the major parts of a welding symbol.
explain the parts of a groove preparation.
describe how nondestructive test symbols are used.
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The document discusses welding symbols and weld joint design according to ISO standards. It covers elementary weld symbols, supplementary symbols, dimensioning of welds, examples of weld joint applications, and factors to consider for different joint types including butt, tee, lap, corner and edge joints. Guidelines are provided for edge preparation, weld types, joint penetration, reinforcement, and welding positions.
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This document discusses advanced welding symbols used in welding specifications. It describes various supplemental welding symbols such as weld all around, field weld, weld length, intermittent weld, contour, finish, fillet weld, groove weld, melt-through, consumable insert, backing, spacer, edge weld, surfacing weld, and spot/projection welds. For each symbol, it provides the definition, examples of how it is depicted in a welding symbol, and any additional information that may be included. The document is intended to teach how to interpret complex welding symbols containing multiple elements of information.
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000194
- 1. Welding Symbols Understanding Welding Symbols Terms and Definitions
- 2. Created By Jeffrey Rodenbarger Drake-Williams Steel Omaha, Nebraska
- 3. Reference Line (Required element) •Reference Line Always Horizontal
- 4. Reference Line (Required element) Arrow Arrow Line
- 5. Reference Line (Required element) Arrow Tail Tail
- 6. Reference Line (Required element) Arrow Tail Reference Line must always be horizontal, Arrow points to the line or lines on drawing which clearly identify the proposed joint or weld area. The tail of the welding symbol is used to indicate the welding or cutting processes, as well as the welding specification, procedures, or the supplementary information to be used in making the weld.
- 7. Reference Line (Required element) Arrow Tail Reference Line must always be horizontal, Arrow points to the line or lines on drawing which clearly identify the proposed joint or weld area. The tail of the welding symbol is used to indicate the welding or cutting processes, as well as the welding specification, procedures, or the supplementary information to be used in making the weld. Basic components of a WELDING SYMBOL Tail omitted when reference not used Arrow connects reference line to arrow side member of joint or arrow side of joint
- 8. A circle at the tangent of the arrow and the reference line means welding to be all around. All the way Around
- 9. A flag at the tangent of the reference line and arrow means Field Weld. Field Weld Symbol
- 10. ARROW SIDE OTHER SIDE Weld Symbol Terminology
- 11. Break in arrow means arrow side must be side that beveling or other preparation required.
- 12. Fillet Weld (Arrow Side Only)
- 13. Fillet Weld (Other Side)
- 14. 1/4 1/4 Size of Fillet Weld Noted
- 15. 1/4 1/4 (5/16) (5/16) Depth of preparation or groove Depth of penetration Example of Double Bevel Groove weld
- 16. Plug or Slot Weld Symbol Arrow Side
- 17. 5/16 5/16 What does this symbol Represent?
- 18. 5/16 5/16 Single-Bevel-Groove and Double Fillet Weld Symbol
- 19. Single-Bevel-Groove and Double Fillet weld Symbols
- 20. Chain Intermittent Fillet Weld Weld both sides each end and 10 inches center to center in between 1/4 1/4 2-10 2-10 10 in
- 21. Staggered Intermittent Fillet Weld Weld ends than 10 inch centers staggered each side 10 in 10 in 2-10 2-101/4 1/4
- 22. S(E) L-P F A R (N) Depth of bevel Groove weld size Finish Symbol Groove Angle included angle of countersink for plug welds Root opening; Depth of filling for plug and slot welds. Pitch(Center-to- center spacing) of welds Number of spot, seam, stud, plug, slot, or projection welds ARROW SIDE OTHER SIDE FIELD WELD Length of weld
- 23. The End