Final answer:
In engineering, when a weld defect needs to be repaired, it must be removed. Various methods can be used to remove different types of weld defects. By removing weld defects, engineers ensure the structural integrity of the welded joint.
Step-by-step explanation:
In engineering, when a weld defect needs to be repaired, it must be removed. This is done to ensure the structural integrity of the welded joint and prevent any potential failures. To remove a weld defect, various methods can be used depending on the type and severity of the defect.
For example, if the defect is a undercut (a groove-like irregularity), it can be removed by grinding the excess material down to the level of the base metal. If the defect is a porosity (air pockets trapped in the weld), the affected area can be preheated and rewelded to eliminate the porosity.
By removing weld defects, engineers can ensure that the welded joints meet the desired standards and specifications, resulting in strong and reliable structures.