Gasless stainless steel MIG wire is a type of welding wire that is used in a MIG (metal inert gas) welding process. It is called "gasless" because it does not require the use of an external shielding gas to protect the weld pool from atmospheric contamination. This makes it a convenient option for welding in outdoor or windy environments, or for applications where it is difficult to use a shielding gas.

Gasless stainless steel MIG wire is typically made from a solid, stainless steel core wire that is coated with flux. The flux helps to protect the weld pool from atmospheric contamination and also provides some deoxidizing action to improve the quality of the weld. Gasless MIG wire is generally easier to use than wire that requires a shielding gas, but it may not produce welds that are as strong or corrosion-resistant as those made with a shielding gas. It is important to carefully follow the manufacturer's instructions for using gasless MIG wire to ensure the best results.