Asme Standard Patched _best_ -

ASME Standard for Patched Components: A Guide to Repair by Welding and Bonding

The patch material must match the original base metal specifications or be an ASME-approved equivalent to ensure chemical and mechanical consistency. Welding Standards:

Step 3: Material Procurement

• Shape: Typically circular or elliptical (to avoid stress concentration corners). Rectangular patches require corner radii.
• Thickness: Must be sufficient to provide the required reinforcement area, but not less than the original vessel thickness unless properly calculated.
• Integration: Full penetration welds are required for patches over holes or cutouts. Partial penetration allowed only for very small, non-structural repairs.

Key Requirements Under ASME PCC-2 Article 202 (Full-Overlay Repair)

• Weld Type: Usually full penetration groove weld around the entire patch periphery.
• Post-Weld Heat Treatment (PWHT) : Required if base material thickness or service conditions mandate it (e.g., P-No. 3, 4, 5 materials above certain thicknesses).
• NDT Requirements:

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  Step 4: Welding Procedure Specification (WPS)