Suojakaasuksi

Suojakaasuksi, often translated as "shielding gas" or "protective gas" in English, refers to a gas or mixture of gases used to protect a molten metal from atmospheric contamination during welding or other high-temperature processes. The primary purpose of a suojakaasuksi is to displace air, which contains oxygen and nitrogen, from the weld zone. Oxygen can cause oxidation, leading to brittle welds and defects, while nitrogen can dissolve into the molten metal and cause porosity.

Commonly used suojakaasuksi include inert gases such as argon and helium, or active gases like carbon dioxide and oxygen, or mixtures of these. The choice of suojakaasuksi depends on the type of metal being welded, the welding process, and the desired weld properties. For instance, argon is widely used for aluminum and stainless steel due to its inert nature. Carbon dioxide, being more reactive, is often used for welding carbon steel as it provides good penetration and is cost-effective. Mixtures, such as argon-CO2 blends, offer a balance of properties and are frequently employed for various steel applications. The proper selection and application of suojakaasuksi are crucial for achieving high-quality, defect-free welds.