203 After completing Unit 16, you will be able to: Differentiate a groove weld from other types of welds. Interpret dimensions for preparing groove welds, including the depth of preparation, groove angle, bevel angle, and root opening size. Determine the preparation size and effective throat of groove welds. Apply groove weld dimensioning standards. Interpret surface finish and contour symbols. Interpret melt-through, back, and backing weld symbols. Explain uses for backing, joint spacers, and runoff weld tabs. Key Words backing bevel angle effective throat flare-groove welds groove angle groove face groove radii joint root joint spacers root faces root opening runoff weld tabs Groove welds are made in the space between two sections of metal, Figure 16-1. With the exception of the square-groove and flare-groove joints, one or more of the members being joined is prepared by removing metal to form a V-, J-, or U-shaped trough. This joint preparation provides for deeper or full penetration of Figure 16-1. Single-groove and double-groove weld joints are shown. Square-groove welds Single-bevel-groove weld Double-bevel-groove weld Single-V-groove weld Double-V-groove weld Single-J-groove weld Double-J-groove weld Unit 16 Groove Welds
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