Which weld type is formed by filling a circular hole through one member to join to another?

Which weld type is formed by filling a circular hole through one member to join to another?

• A. Plug weld
• B. Slot weld
• C. Fillet weld
• D. Groove weld

Answer: (A)

A plug weld forms when you fill a circular hole in one plate to join it to another. You punch or drill a round hole in the first member, place the second member against it, and then deposit weld metal to fill that hole so the weld fuses both pieces together. The weld sits around the hole’s edge and fills the interior, creating a through-weld that bonds the two plates. This is different from a slot weld, which uses an elongated opening along a seam; a fillet weld, which joins two members at a corner or T-joint without going through a hole; and a groove weld, which fills a groove between members.

A plug weld forms when you fill a circular hole in one plate to join it to another. You punch or drill a round hole in the first member, place the second member against it, and then deposit weld metal to fill that hole so the weld fuses both pieces together. The weld sits around the hole’s edge and fills the interior, creating a through-weld that bonds the two plates.

This is different from a slot weld, which uses an elongated opening along a seam; a fillet weld, which joins two members at a corner or T-joint without going through a hole; and a groove weld, which fills a groove between members.