How To Choose Flux Core Wire?



The flux-cored wire is a type of wire which is used in welding machine for welding purposes. These wires are very useful and effective for various kinds of weldings. Flux-cored wires are optimized to obtain performance that is not possible with solid wires.

The flux-cored wire includes high disposition which gives many advantages during welding something. It has some useful chemical properties which give smoothness and stronger welding in construction applications.

But for the good result, you must have the right type of flux-cored wires. This article might help in that case.

Flux Core Materials:

These wires are designed in a tube shape and the outer layer of the wire is mainly metal. The inner section is actually compound with various materials which are called “flux”.

Flux is designed in a way that when the wire is melted in the arc then the compound makes a shielding gas that protects the welding.

Type Of Flux Core:

Mainly flux-cored wires are divided into two categories, Self-shielded flux core wire (FCAW-S) and Gas shielded flux core (FCAW-G) (double shielded).

How To Choose A Flux Core Wire?

Well, there are various types of popular flux-cored wires. And like I already said, they are individually good and effective for different cases. So, you must choose flux wires on the basis of how and where you want to apply the wielding.

Here are some most used wires which might help you to choose the right flux wire for your work-

  • E71T-1: E71T-1 is the most popular and widely used flux-cored wire in the world. It is the top choice of many workers for shipbuilding, general structural welding, and steel fabrication wildings.

It provides fast cooling rutile slags which are very useful and important for vertical-up position welding. It also gives the smoothest welding arc.

  • E70T-4: E70T-4 gives the highest semi-automatic deposition rates. It gives slightly lower deposition rates than E70T-1, but it offers a smoother welding arc. 

These types of wires are widely used in structural steel fabrication industries. It is the fastest flux-cored wire to join a thick steel plate in the flat position (semi-automatic welding).

  • E70T-5: This flux-cored wire offers excellent crack resistance on hard-to-weld steels. E70T-5 is a shielded wire and has a basic slag system, which removes phosphorus and sulfur (sometimes which can cause cracking) from the welding metals.
  • E70T-5 also has the lowest disposable hydrogen levels among the flux-cored wires which give excellent resistance to hydrogen cracking.
  • E71T-8: For semi-automatic welding without shielding gas, these wires give the highest deposition rates. This wire is self-shielded, allowing it to be used outdoors easily. For that reason, E71T-8 is widely used in outdoors and field erection welding. These wires are widely used to join thick steels where there is no impact of toughness require.
  • E71T-14:E71T-14 is a good choice and widely used for welding for coated and galvanized steel sheets. E71T-14 is a self-shielded wire and it has some core materials which allow exploding in the arc which minimizes the possibility of cracking. E71T-14 is widely used in the automobile industries for fabricating galvanized steels.


Most type of flux-cored wires are available in 030, 0.035, 0.045 0.068, 11/4,5/64, 3/32 etc. diameters. Try to look at your welder machine. There should be a minimum and maximum thickness number which can be used on the welder.


Flux-cored wire welding is a very easy and effective welding wire. But it is more effective if you choose your flux to wield wires according to your needs. I hope this article might help you to choose your wire wisely because the wise choice of flux wire might affect a lot on welding.

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