Having said that, it's important to keep in mind that A flux is formed over the weld which must be chipped off.It typically creates more spatter and fumes.Gasless welding wire has a couple of disadvantages over gas-shielded wire What are the disadvantages of Gasless MIG welding ? This formula is not easy to perfect, and that’s why many welders prefer the tried and tested Weldclass Platinum GL-11 gasless welding wire over other brands.

The secret to the performance and user appeal of any gasless welding wire is the formula of the flux. The flux contained in the wire also acts as a cleaning agent and allows it to be more forgiving of rusty, dirty or contaminated base metals. Gasless welding offers relatively high welding speeds and generally has good penetration into the base metal. It is also ideal for outdoor environments where windy conditions would typically cause porosity when using standard MIG wire and gas. Self-shielded wire is also used to reduce costs in non-production work where the cost of gas (and / or the cost of rental) is a significant portion of the overall cost. Gasless welding wire is widely used in field and construction work, due to its simplicity and portability – no gas means no more lugging around gas cylinders. (Strictly speaking, the term 'MIG' is not correct since 'MIG' stands for metal inert gas). The flux contained within the hollow wire reacts with the welding arc to form a slag and also create a gas shield to protect the weld pool from the atmosphere until it has solidified. More correctly, gasless wire is a self-shielded FCAW wire (flux cored arc wire).

Gasless 'MIG' wire is a flux-cored, self-shielded welding wire for use in MIG welding machines.

Gasless flux core welding wire