Continuing on our series from before Christmas, we have added a few more weld defects.

Weld Crater is the unfilled end of a weld. The full cross section of weld is not filled and is considered a weld defect.

Weld Crater
Weld Crater


  • stopping the arc too soon, not waiting to fill the weld end – crater

 Why is a crater a defect

  • can lead to cracking of weld, by leaving a “weak” spot in the end of the weld

 How to Prevent the Problem

  • when stopping welds allow the weld puddle to fill before stopping the arc.

 How to Repair

  • Lightly grind the area where the crater has formed
  • Backfill the area with a crater to repair


For information on previous topics, select below.

Lack of Fusion

Incomplete Penetration

Slag inclusion


Until next week,

Bonnie Pankratz