Which of the following can result from poor welding technique?

The choice highlighting decreased weld integrity is accurate because poor welding technique can lead to a variety of defects that compromise the strength and durability of the weld. When welders do not adhere to proper practices, it can result in incomplete fusion, porosity, or excessive spatter, among other issues. These defects can create weak points in the weld, making it more susceptible to failure under stress, which directly affects the overall structural integrity of the welded joint.

In contrast, improved tensile strength and enhanced aesthetics would be outcomes of skilled welding techniques that ensure a high-quality weld. Additionally, while increased production speed is a goal in many manufacturing processes, it is generally not an indication of quality and can often lead to neglecting crucial steps needed for a strong weld. Thus, the most direct consequence of poor welding practices is a reduction in the weld's integrity, making this the correct answer.