Distortion (Weld)

Distortion arises from the rapid, localized heating and cooling inherent to the welding arc, causing the metal to expand and contract unevenly across the component footprint. In large fabrications, uncontrolled distortion can exceed tolerance limits, necessitating expensive straightening operations or scrapping of otherwise sound material; therefore, prevention through proper fixture design and restraint is far more economical than post-weld correction.

Welding sequence plays a critical role in managing distortion, as deliberate weld placement can balance shrinkage forces and minimize overall part movement. Reducing heat input through optimized parameters, employing laser-cutting for tight fit-ups, and considering multi-pass strategies all contribute to holding dimensional accuracy while producing the required joint strength.