Welding Wire Used for Gas Protection Welding
Welding is a process by which two or more pieces of metal are joined together by heating them to their melting points and then allowing them to cool in such a way that the pieces are permanently fused together. Gas protection welding is a form of welding which uses a shield of inert gas in order to protect the weld from contaminants such as oxygen, nitrogen, and moisture. Gas protection welding is commonly used for stainless steel and nickel alloys, and requires specific types of welding wire in order to achieve optimal results.
In China, the welding wire used for gas protection welding is regulated by the national standard GB/T14958-1994. This standard sets the requirements for gas protection welding wire, including chemical composition and size, physical and mechanical properties as well as testing methods. The standard also specifies the general purpose welding wire for gas protection welding, as well as the special purpose alloys for welding stainless steel and nickel alloys.
The general purpose weld wire for gas protection welding is typically made from low-alloy steels, copper-coated, copper-cladded, or stainless steels. These wires are designed to provide the best mix of weldability, ductility, strength and corrosion resistance for general purpose welding applications. The low-alloy steel wires have higher tensile strength, higher yield strength, and higher resistances against rust and scaling than other alloys, while maintaining good ductility and weldability.
Special purpose weld wires are made of higher alloyed materials such as stainless steel, nickel, and cobalt. These alloys are used for welding stainless steel and nickel alloys because they have higher resistances against corrosion and corrosion fatigue. They also have increased strength, toughness and ductility. The different alloys are designed to provide specific weld properties depending on the particular application.
All welding wire used for gas protection welding must meet the requirements of the GB/T14958-1994 standards. However, it is important to note that the choice of welding wire for any particular application should be based on the type and condition of the materials being welded, the thickness and design of the joint, as well as the requirements of the environment in which the welding is taking place. In order to determine the optimal welding wire choice for any given application, the operator should consult a qualified welding engineer for advice.
Gas protected welding is a valuable process for joining metals together, and is often used for stainless steels and nickel alloys. The welding wire used must meet the requirements of the GB/T14958-1994 standard in order to achieve optimal results. The operator must however also take into consideration the particular application and environment if they wish to find the right welding wire for any given situation.
