Folding steel, when done properly, does not inherently make it weaker. In fact, folding steel can potentially enhance its strength and improve certain characteristics, depending on the specific steel and the folding technique used.

Historically, folding steel was a technique employed in the production of traditional Japanese swords, such as the katana. The process involved repeatedly heating, hammering, and folding the steel to create layers and remove impurities, resulting in a more homogenous and refined material.

The primary purpose of folding steel was to achieve a desired grain structure and distribution of carbon content within the steel. This process allowed the bladesmith to create a balance between hardness and toughness, resulting in a blade with good cutting performance and resilience.

However, it is essential to note that folding steel alone is not the sole determinant of a blade's quality or performance. Other factors such as the choice of steel, heat treatment, and the skill of the bladesmith are equally critical.

Improper folding techniques, excessive folding, or inadequate heat treatment can potentially introduce weaknesses or compromise the steel's integrity. Therefore, it is crucial that folding is performed correctly, taking into consideration the specific properties of the steel and the intended application.

In modern times, with advancements in steel manufacturing and the availability of high-quality steels, the folding process is less commonly used. Many modern steels are already produced to high standards and do not require folding to achieve the desired properties.