Causes: Joint too rigid; welds too small for size of parts joined; poor welds; improper joint preparation; unsuitable electrode.
Corrections: Design the structure and develop a welding procedure to eliminate rigid joints; increase weld size to handle the load; make a full size weld in short sections; develop a welding sequence that leaves the ends of the joint free to move as long as possible; proper fusion; preheating; prepare uniform. joints.