Which cutting process cannot be used with stainless steel?

Oxy-acetylene cutting is not suitable for stainless steel primarily due to the oxidation that occurs during the process. This method relies on a chemical reaction between oxygen and the metal to achieve cutting. However, stainless steel contains chromium, and when it's subjected to high temperatures from the oxy-acetylene flame, it can oxidize and lose its corrosion-resistant properties, resulting in a poor quality cut and contamination of the material. Additionally, this process can also lead to warping or distortion of the stainless steel component due to the intense heat.

Conversely, other cutting methods such as plasma, laser, and water jet cutting are more effective for stainless steel. Plasma cutting uses an ionized gas that can cut through various materials, including stainless steel, without losing its structural integrity. Laser cutting offers precision and can be used with various thicknesses of stainless steel, while water jet cutting avoids heat altogether, preventing any oxidation or warping. This makes those methods suitable and effective for working with stainless steel materials.