Which is better? Solid Wire or Flux Cored Wire

As all welding professionals know Gas metal arc welding (GMAW) and flux cored arc welding (FCAW) have different characteristics and it is the responsibility of the welding operators to evaluate when selecting for welding applications. The qualifying factors to be considered for arriving at a proper decision are - thickness of the material, proper shielding gas, wire feed speed and voltage settings, location of the work site and weld appearance.

Please bear in mind there is no single uniform solution for all types of welding and many variables will have to be considered before opting for either solid or flux cored wire. It is worthwhile discussing this issue in greater detail to benefit less experienced welders as also occasional welders like farmers, ranchers, motor sports people and other hobbyists. It is good to understand the basics of solid and flux cored wire and how to optimize the advantages of each type.

It is known that MIG power sources opt for a continuous solid wire electrode for filler metal and require a shielding gas delivered from a pressurized gas bottle. It is seen that mild steel solid wires are usually copper-coated to prevent oxidation, support electrical conductivity and help increase the life of the welding contact tip. The shielding gas protects the molten weld pool from impurities contained in the surrounding atmosphere.

The most common shielding gas contains 75 percent Argon and 25 percent CO2. While using solid wire in open areas, the operator must exercise caution as winds can blow the shielding gas coverage away from the welding arc. The operator may be required to use windshields.

As regards flux cored wires, please know there are two types - gas shielded and self shielded. Gas shielded flux cored wires require external shielding gas and the slag is easily removable. The operator can opt for gas shielded flux cored wires when welding on thicker metals or in out-of-position applications. It is seen that gas shielded flux cored wires have a flux coating that solidifies more quickly than the molten weld material.

Thus, it creates a "shelf" to hold the molten pool when welding overhead or vertically up. Self shielding flux cored wire does not require external shielding gas as the weld pool is protected by gas generated when flux from the wire is burnt. Self shielding flux cored wire is more portable because it is not dependent on an external gas tank.

People naively ask the question - which is better, solid wire or flux cored wire? To be frank, no one type is superior over the other and each type has its own properties and which type to use depends on the applications. As regards performance, both types of wire produce excellent welds with little to choose - if applied correctly and used within the proper parameter settings.

It may be said that solid wire provides deep penetration in the root and has little spatter. Flux cored wire has a larger ball type transfer and produces low spatter levels. Some operators are happy with solid wire for thinner applications because there is no slag to remove and it is ready to paint and the weld beads provide an aesthetic look.

Some operators are happy with solid wire for thinner applications because there is no slag to remove and it is ready to paint and the weld beads provide an aesthetic look. Finally, one word of advice - in order to obtain the best possible results, the operator must be willing to make suitable adjustments based on the worksite variables and consider having both solid and flux cored wire available.