AWS D1-Series References to WPS for Plug and

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This document defines plug and slot welds and discusses how they are represented in welding symbols Plug welds use a round hole while slot

plug weld vs slot weld Slot and Plug Symbol Slot and plug welds are made when holes are created in one material and then welded to another by filling the holes with weld metal

plug and slot welds To enable thicker plate to be joined by 'spot welding' a circular or elongated hole may be machined through the top plate, enabling either a plug or a slot weld