Automation System 
Energy Engineeing 
Instrumentation System 
Mechanical Engineeing 
Piping Technologies 
Transportations 
Manufacturing 
Training Material 
American Welding Society Welding Symbol Chart
Contents
The American Welding Society (AWS) provides a comprehensive set of symbols for representing welds on engineering drawings. Below is a chart summarizing these symbols based on AWS standards:
| Welding Symbol | Description |
|---|---|
| Fillet Weld | A triangular weld that joins two surfaces at right angles. |
| Square Groove Weld | A weld with a square groove. |
| V-Groove Weld | A weld with a V-shaped groove. |
| Bevel Groove Weld | A weld with a bevel-shaped groove on one piece. |
| U-Groove Weld | A weld with a U-shaped groove. |
| J-Groove Weld | A weld with a J-shaped groove on one piece. |
| Flare-V Groove Weld | A weld with a flare V-groove, typically on curved surfaces. |
| Flare-Bevel Groove Weld | A weld with a flare bevel groove, typically on curved surfaces. |
| Plug Weld | A weld in a circular hole to join overlapping members. |
| Slot Weld | A weld in an elongated hole to join overlapping members. |
| Spot Weld | A weld made by electrical resistance at a single spot. |
| Seam Weld | A continuous weld made along a seam. |
| Backing (or Back) Weld | A weld applied to the reverse side of a joint. |
| Surfacing Weld | A weld used to apply a layer of metal on a surface. |
Additional Symbols and Modifiers
- Arrow Line: Points to the location of the weld.
- Reference Line: The baseline to which all symbols are attached.
- Tail: May include supplementary information about the weld process, filler material, etc.
- Weld All Around: A circle around the intersection of the reference line and arrow line, indicating that the weld is to be made all around the joint.
- Field Weld: A flag at the junction of the reference line and arrow line indicates that the weld is to be made in the field.
Basic Weld Symbols
Weld symbols are used on engineering drawings to indicate the type of weld, its size, and other pertinent information. Here are some of the basic weld symbols:
- Fillet Weld: A triangular weld symbol used to join two surfaces at approximately right angles to each other.
- Groove Weld: These welds are used to fill in the space between two members that are to be joined. Examples include square, bevel, V, U, and J-groove welds.
- Plug or Slot Weld: These are circular or elongated holes in one member of a joint that are filled with weld metal.
- Spot Weld: A weld made by the heat obtained from resistance to electric current flow through the workpieces held together under pressure.
- Seam Weld: A continuous weld made by moving the welding electrode along a seam to produce a continuous joint.
- Backing (or Back) Weld: Used to provide support to ensure complete penetration and prevent weld metal from seeping through the joint.
- Surfacing Weld: Used to apply a layer of metal to the surface of a workpiece, often for wear resistance.
ISO Standard for Welding Symbols
The ISO standard for welding symbols is ISO 2553. This standard provides guidelines for the representation of welded joints on drawings, ensuring uniformity in the presentation of welding symbols across different countries and industries.
AWS Code for Welding Symbols
The American Welding Society (AWS) code for welding symbols is found in AWS A2.4, “Standard Symbols for Welding, Brazing, and Nondestructive Examination.” This standard outlines the use of symbols to indicate welding requirements and is widely used in the United States and other countries.
Please Log in to download
Contents1 I. What is pipe dimension?2 II. Basic Terminology in Pipe Dimensions2.0.1 1. Nominal Pipe Size (NPS)2.0.2 2. Outer Diameter (OD)2.0.3 3. Inner Diameter (ID)2.0.4 4. Wall Thickness2.0.5 5. Pipe Schedule2.0.6 6. Pipe Length2.0.7 7. Diameter Nominal (DN)2.0.8 8. Schedule Number2.0.9 9. Fluid Flow Capacity2.0.10 10. Pipe End Types2.0.11 11. Pressure Rating2.0.12 12. Burst Pressure2.1 […]
Contents0.0.1 0.1 What is an API Standard?0.2 Key Features of API Standards:0.3 Examples of API Standards:0.3.1 The History of API Standards0.3.2 The Global Impact of API Standards0.3.3 Compliance and Certification0.3.4 Challenges and Criticisms0.3.5 The Future of API Standards1 Key API Standards in the Industry1.0.1 1. Drilling and Well Servicing Standards1.0.2 2. Pipeline and Piping Systems […]
Contents1 I. What is the ASME Standard?1.1 The History and Evolution of ASME2 II. ASME Standards: Scope and Application2.0.1 2.1 1. Boiler and Pressure Vessel Code (BPVC)2.1.1 Key Applications:2.2 2. ASME B31 Piping Codes2.2.1 Key Sections:2.2.2 Key Applications:2.3 3. ASME Y14 Engineering Drawing Standards2.3.1 Key Applications:2.4 4. ASME Codes for Materials and Fasteners2.4.1 Key Applications:2.5 […]
Contents1 I . Definition of Basis of Design (BOD)1.1 1. Project Overview1.2 2. Design Criteria1.3 3. System Descriptions1.4 4. Assumptions and Constraints1.5 5. Materials and Equipment1.6 6. Risk Management1.7 7. Documentation and Reporting1.8 8. Coordination and Integration2 II. The Role of Basis of Design in Project Development2.0.1 Foundation for Design Decisions2.0.2 Guiding the Project’s Direction2.0.3 […]
Contents1 I. Introduction1.0.1 Brief Overview of ASTM B1171.0.2 Importance of Corrosion Testing1.0.3 Applications in Various Industries2 II. History and Development2.0.1 Origin of ASTM B1172.0.2 Evolution of the Standard Over Time2.0.3 Contributions to Industry Practices2.1 III. Purpose and Scope2.1.1 Objective of ASTM B1172.1.2 Scope of the Standard2.1.3 Importance in Quality Control and Product Development3 IV. Test […]
Contents1 Introduction ASTM C392 Background ASTM C392.0.1 Explanation of Compressive Strength and Its Significance in Concrete Structures2.0.2 Historical Context and Development of ASTM C393 Purpose of ASTM C393.0.1 To Assess the Quality and Strength of Concrete3.0.2 To Ensure Compliance with Construction Specifications and Safety Standards4 Specimens4.1 Description of the Cylindrical Concrete Specimens Used4.1.1 Standard Dimensions4.1.2 […]
Contents1 I. Definition of Plumbing Standards2 II. Understanding Plumbing Standards2.1 1. Key Components of Plumbing Standards2.2 2. Organizations Setting Plumbing Standards2.3 3. Importance of Adhering to Plumbing Standards3 III. The List of Plumbing Standards3.0.1 1. Uniform Plumbing Code (UPC)3.0.2 2. International Plumbing Code (IPC)3.0.3 3. National Standard Plumbing Code (NSPC)3.0.4 4. ASME A112 Series3.0.5 5. […]
Contents1 I. What is a Piping & Instrumentation Diagram (P&ID)?1.0.1 Explanation of Piping & Instrumentation Diagram (P&ID) and Their Importance in the Process Industry1.1 Functions and Importance of Piping & Instrumentation Diagram1.1.1 Importance in Design, Operation, and Maintenance1.2 Piping & Instrumentation Diagram (P&ID) Standardization2 II. Components of Piping & Instrumentation Diagram (P&ID)2.0.1 1. Piping2.0.2 2. […]
Contents0.1 I. Introduction0.2 What is ASTM C33 Standard?0.2.1 Definition and Purpose0.2.2 Key Components of ASTM C330.2.3 Importance in Concrete Construction1 II. Overview of Aggregates1.1 A. Definition of Fine and Coarse Aggregates1.2 B. Common Types of Aggregates Used in Concrete1.2.1 C. Role of Aggregates in Concrete Performance2 III. Grading Requirements2.0.1 A. Fine Aggregate Grading2.0.2 B. Coarse […]
Contents1 I .What are ISO Standards?1.1 1. Definition1.2 2. Development Process1.3 3. Benefits1.4 4. Importance of Standards2 II. Categories of ISO Standards2.1 1. Industry-Specific Standards2.2 2. Management System Standards2.3 3. Product Standards3 III. Comprehensive List of ISO Standards3.1 1. Introduction to the List3.2 2. Numerical List of ISO Standards3.2.1 Quality Management3.2.2 Environmental Management3.2.3 Information Security […]