AWS C5.7 : 2000

RECOMMENDED PRACTICES FOR ELECTROGAS WELDING

American Welding Society

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Personnel (Reaffirmation)
Personnel (Original)
Foreword
List of Tables
List of Figures
1. General
    1.1 Scope
    1.2 Introduction
2. Referenced Standards
3. Definitions
4. Fundamentals
    4.1 Process Description
    4.2 Principles of Operation
    4.3 Electrode Variations
    4.4 Consumable Guide Variations
5. Equipment
    5.1 Welding Power Source
    5.2 Wire (Electrode) Feeder
    5.3 Electrode Guide Oscillators
    5.4 Electrode Guide
    5.5 Backing Shoes (Dams)
    5.6 Controls
6. Electrodes and Shielding Gas
    6.1 Electrodes
    6.2 Shielding
    6.3 AWS Specification for Electrogas Filler Metal
7. Applications
    7.1 Base Metals
    7.2 Joint Design
    7.3 Assembly and Alignment
    7.4 Typical Applications
8. Metallurgical Advantages and Limitations
    8.1 Electrogas Welding Thermal Cycle
    8.2 Weld Macrostructure
    8.3 Preheat
    8.4 Postweld Heat Treatment
    8.5 Residual Stresses and Distortion
    8.6 Mechanical Properties
9. Selection of Process Variables and Other Welding
    Conditions
    9.1 Welding Voltage
    9.2 Welding Current-Wire Feed Speed
    9.3 Form Factor
    9.4 Electrode Extension
    9.5 Electrode Oscillation
    9.6 Joint Opening
    9.7 Work Lead
    9.8 EGW Procedures
10. Inspection of Welds and Rework
    10.1 Methods of Inspection
    10.2 Acceptance
    10.3 Quality Control
    10.4 Rework
11. Training
    11.1 Process Variables
    11.2 Equipment Familiarization
12. Qualifications
    12.1 Process and Equipment
    12.2 Welding Procedure
    12.3 Welding Operator
13. Troubleshooting Guide
    13.1 Weld Start Porosity
    13.2 Weld Porosity
    13.3 Weld Termination Porosity
    13.4 Centerline Weld Cracking
    13.5 Incomplete Fusion at Weld Toes
    13.6 Incomplete Fusion to One Groove Face
    13.7 Overlap and Poor Fusion
    13.8 Underfill
    13.9 Starting Tab Melt-Through
    13.10 Copper Pickup
    13.11 Metal Spillage
    13.12 Electrode Wander
    13.13 Arcing to Groove Faces
    13.14 Hourglass Nugget Shape
14. Safety Recommendations
    14.1 Radiant Energy
    14.2 Burn Protection
    14.3 Electrical Hazards
    14.4 Fumes and Gases
    14.5 Noise and Hearing Protection
    14.6 Safety and Health Information Sources
Annex A (Informative) - Safety and Health References
Annex B (Informative) - Supplementary Reading List
Annex C (Informative) - Guidelines for the Preparation of
                        Technical Inquiries
List of AWS Documents on Arc Welding and Cutting

Abstract

Specifies recommended practices for electrogas welding low carbon pressure vessel, and structural steels. Aluminum and stainless steel are excluded because of a lack of general commercial use of electrogas welding for these materials.