What Is Flux Cored Arc Welding?

The basic working principle of flux-cored wire gas shielded welding is the same as that of ordinary molten electrode gas shielded welding. A fusible flux-cored wire is used as one electrode (usually connected to the positive electrode, that is, DC reverse connection), and the base material is used as the other electrode. Generally, pure CO ₂ or CO ₂ + Ar gas is used as the protective gas. The main difference from ordinary molten electrode gas shielded welding is that the welding wire is filled with a flux mixture. During welding, the flux material, wire metal, parent metal metal and shielding gas in the molten state under the effect of arc heat metallurgically interact with each other, and a thin layer of liquid slag is formed to cover the molten droplets and cover the molten pool. Molten metal forms another layer of protection. In essence, this welding method is a method of joint protection of slag, as shown in the figure.

Flux-cored arc welding

The basic working principle of flux-cored wire gas shielded welding is the same as that of ordinary molten electrode gas shielded welding. It uses a fusible flux-cored wire as one electrode (usually connected to the positive electrode, that is, DC reverse connection), and the base material as the other electrode. Generally, pure CO ₂ or CO ₂ + Ar gas is used as the protective gas. The main difference from ordinary molten electrode gas shielded welding is that the welding wire is filled with a flux mixture. During welding, the flux material, wire metal, parent metal metal and shielding gas in the molten state under the effect of arc heat metallurgically interact with each other, and a thin layer of liquid slag is formed to cover the molten droplets and cover the molten pool. Molten metal forms another layer of protection. In essence, this welding method is a method of joint protection of slag, as shown in the figure.

Chinese name

Flux-cored arc welding

Foreign name

Flux Cored Arc Welding (FCAW)

Flux-cored wire arc welding can be used for both semi-automatic and automatic welding, but is usually used for semi-automatic welding. Different welding wires and shielding gas can be used to perform flat welding, overhead welding and all-position welding. Compared with ordinary molten electrode gas shielded welding, shorter wire extension length and larger welding current can be used. Compared with manual arc welding, when welding fillet welds, welds with larger fillet sizes can be obtained. This welding method is usually used to weld carbon steel, low-parameter alloy steel, stainless steel and cast iron. Due to the above characteristics, this method is the most promising welding heat for the automatic and semi-automatic welding of ordinary hand arc welding in the era of welding steel. "The core of the flux-cored wire is made of low-carbon steel or low-alloy steel steel. The welding process of the welding wire is to first roll the steel sheet (usually 08A) into a U-shaped cross section, and then limit the U-shaped steel strip of the powder material to a different shape, and smell two. The flux material is compacted and finally chanted Fu Fan Zhuang Du Fan Shi started.

Flux-cored wire gas shielded welding commonly used as shielding gas. The corresponding protective gas should be used in use.

Safe operation technology of flux-cored arc welding

[1] When flux-cored wire arc welding, the arc temperature is about & 000-I 0000 `C, and the arc light radiation is stronger than manual arc welding, so the protection should be strengthened.

(2) When welding with flux-cored wire arc welding, there are many spatters, especially thick wire welding (diameter larger than 1.6mm), and large particle splashes are generated. Welders should have perfect protective equipment to prevent human body burns.

(3) The carbon monoxide gas is lined with carbon monoxide in the fierce ficus from the arc high to the bottom of the warehouse, and it is the best choice to protect the ficus when you are in full swing. , There should be someone outside the container.

(4) The voltage used by the carbon dioxide gas preheater must not be higher than 36V, and the casing is grounded reliably. At the end of the work, immediately cut off the power and air supply.

(5) Cylinders filled with liquid carbon dioxide, the full bottle pressure is about 0. 5MPa, but when subject to additional enforcement. Hit elevated. Therefore, safety measures comply with the provisions of the "Cylinder Safety Supervision Regulations".