How to Flux Core Weld?

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Flux core weld is a technique designed by MIG welding procedures. Flux welding involves a combination of silicate and carbonate materials used in shielding a weld from atmospheric gases. The model also contains a metal arc between the workpiece and the electrode tubular that provide heat used in the welding operations. Now we will explain, How flux core weld?

What are the steps for flux core weld?

You have to follow the 11 Different steps to create a perfect flux core weld.

Step-01: Metal Preparation
Step-02: flux core welding machine Preparation
Step-03: Wire Selection
Step-04: flux core welding settings
Step-05: Wire Stick-Out
Step-06: Push Or Drag
Step-07: Travel Angle
Step-08: Work Angle
Step-10: Horizontal Position
Step-11: Vertical Positions

Step-01: Metal preparation

Metal preparation is the first step showing how to flux core weld. The procedure involves cleaning the metal to remove any surface contamination. Therefore, the base metal requires regular cleaning to prevent the final weld from being contaminated by a rusty or scaly. Generally, the ordinary flux welding prefers using the grinder in the process of cleaning the metals base. Alternatively, a metal brush can apply in the absence of the grinder. Cleaning the welding meals is essential in removing dust from the material and other oxidations, thus enhancing effectiveness in operation.

steel weld cleaning(Metal Preparation)

Accordingly, cleaning the base metal with the clamp attachment is essential in preparing the metal for welding. Careful fixing of the clamp helps in ensuring the perfect contact with the clamp to avoid resistance into the welding circuit, which may reduce the quality of the weld. The technique involves placing material above ¼ inch at the base of the edge to ensure complete joint of the two parts, especially butt joints.

Step-02: flux core welding machine preparation

The preparation involves checking the cables, selecting the electrode polarity, using the correct drive rolls, checking the wire extension, and inspecting consumables. The cable inspection involves surveying the welding equipment to ensure that all connected cables are tight and free from any damages. Selecting electrode polarity is crucial since flux core welding uses direct current.

The polarity connection within the machine close to the drive roll helps in balancing the electric charges in the welding process. Correct drive rolls are necessary since the flux core wire is very soft compared with the solid wire. The rolls made of knurled drive gives a better bite on the material wire without physical compression or changing its appearance, unlike when utilizing standard rolls. Regular checkup of the wire tension ensures proper adjustment of the wire.

Step-03: Wire selection

Wire selection is another step during flux core weld. A cored flux wire designated consists of E71T-11 used in any welding position. Additionally, the wire is readily available in wide range sizes and provides useful welding features for both thicker and thinner materials. A metal filler made of Hobart is essential since it contains Fabshield21B (E71T-11 unique material used in the welding process.

Flux core wire size

The wire of the diameter .030-inch is necessary when flux core welding as it provides the required thickness that facilitates the efficiency in the welding process.  The thick material welding requires a large amount of heat contains a wire with a diameter ranging from 0.035 to 0.045 inches. The given range of diameter help in efficiency operation, thus enhancing the high production of the weld.

Step-04: flux core welding settings

 The choice for the voltage and the amperage used in the flux core welding depends on the metal thickness, Joint configuration, the welding position, and the diameter of the wire. The thicker the metal used, the more voltage and amperage the metal requires, likewise larger diameters consume high voltage and amperage.

flux core welding settings chart

The presence of the flux core welding settings chart/reference charts on the power source helps in setting the correct voltage. The charts also help in developing the speed of the wire. The aspect depends on the thickness and diameter of the wire. The Flux-core calculator is a crucial component to be used in improving the performance of the flux core welding devices. The tools used serve as guidelines in tuning final parameters on the weld test.

Step-05: Wire stick-out

Wire stick-out is the distance of the unmelted electrode that comes out of the contact tip of gun welding. It Usually affects the amount of voltage and amperage drawn by the wire and outcome of the welding. Generally, flux core welding requires around 3/4 inch of stick out, which is almost twice the recommended for MIG welding stickoff.

The stick-out wire is vital since it transmits current from the tip of the welding. The alignment of the welding tip provides accurate control of the stick out of the wire. The longer the length of the stick-out, the lower the current of its output. Consequently, the shorter the stick-out, the higher the current levels. Therefore the stick-out of consistent length is essential in improving the appearance of the flux core weld.

Step-06: Push or drag

Push Angle And Drag Angle

Push or drag technique applies where the tip of the flux core welding nozzle points back the weld pool and immediately pulled away upon the completion of the weld. The mechanism involves a simple thumb to remember whether to use a push or a drag. Similarly, the welders should drag the wire when welding using a flux- core or a stick wire welder.

Step-07: Travel angle

Travel Angle

The positioning of the travel angle is relative to the perpendicular gun and flux core welding pattern within a plane of the joint weld. Usually, all flux core welding conditions require a travel angle ranging between 5 and 15 degrees. Other travel angles past 20 to 25 degrees lead to stiffer spatter, low penetration, and general instability.

Step-08: Work angle

The angle flux core weld involves setting the gun position relative to the workpiece joint plane. Under normal circumstances, the working angle varies with every joint configuration and welding position. Accordingly, the operating angle helps the welders to in performing the flux activities effectively without difficulties. There are various ways of positioning the gun during the welding process, including flat, horizontal, and vertical positioning.

Step-09: Flat position

Weld Position - Flat

Flat positioning consists of the But weld that helps in holding the gun at a work angle of 900 that directs the metal filler straight to the joint, ranging from a travel angle of 5-15 degrees. Notably, the small sideways motion of the gun helps in filing a large gap when making several passes.

Step-10: Horizontal position

Weld Position - Horizontal

Horizontal positioning involves dropping the angle gun work in a slight range between 0-15 degrees due to the gravitational effects. In the process, the welding angle should point upward towards the top part of the metal. The change of the working angle helps in preventing sagging of the filler metal on the bottom part of a flux core welding joint.

Step-11: Vertical positions

Weld Position - Verticle

Vertical welding is essential in making a pre-flux core weld setup used in the productivity of high –quality welds. To attain the required operational gravity, flux-core welders should decrease the amperage and voltage by 10-5 percent, from the setup of the same weld given in the flat position. The down mechanism involving vertical welding is imperative in welding thin metals due to less penetration of the arc caused by the faster traveling rate.


If you are at the beginning stage in the welding field and you need more experience, do not hesitate to get elegant information from the best website. You are at the right place, giving you perfect guidelines on how to flux core weld and make the desired model that leaves your clients with great memories.Therefore,welders from all over the globe must visit the flux welding site and acquire the best experience to take you notch.


How does flux core welding work?

The welding rod uses a tubular wire filled with flux which evaporates under electrical arc that heats the rod and work until metal flows combining them into one progressive piece of metal

Is flux core welding easy?

Yes, it is the simplest and cheapest way to start the welding process.

How thick can you weld with flux core?

By use of a wire material of 0.045 inches.

Can you weld Aluminum flux core?

Yes, Aluminum requires the use of an Alternating Current (AC).

Can I use flux core wire in a MIG welder?

Yes because MIG prefers flux core even in the presence of a gas,

What is better MIG or flux core?

Flux core welding good in some welding situations than MIG.

Last Updated on January 6, 2022 by weldinghubs

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