Types of Welds & Joints - Weld Guru
Slot weld symbols will have the number of slots, the width and length of the slot, and the center-to-center spacing between welds.
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The slot weld symbol is the same that is used for plug welds. The symbol will not show a diameter symbol before the size however.
Welding Symbols: Types, Meaning, Welding Codes - OnestopNDT
Weld symbols are shorthand for describing weld type, size & other processing information. These symbols indicate processes used in metal joining operations.