What effect does improper welding have on material integrity?

Improper welding can significantly compromise the integrity of materials, leading to structural failures in the join. When the welding process is not conducted correctly, several issues may arise, including insufficient fusion, the presence of defects such as cracks or porosity, and incorrect heat treatment. These factors can weaken the joint and make it susceptible to stresses, fatigue, and environmental factors, ultimately resulting in a failure of the structure that relies on that weld.

In contrast, the other options suggest that improper welding either has no impact or guarantees a strong bond, which is misleading. Proper welding techniques are essential to achieve the desired strength and reliability in welded joints, and any deviation from established procedures can undermine that goal.