Particle size: 2.5 - 0.45mm (adjustable according to actual needs)

Loose packing density: 1.4 - 1.8g/cm³

Melting point: 1150 - 1250℃

Product Detail | Technical Information

Product Detail

HJ431 is a high-quality welding flux widely used in the submerged arc welding process. It plays a crucial role in the welding process and can effectively ensure the welding quality and improve the welding efficiency. This welding flux is suitable for the welding of a variety of metallic materials and is particularly popular in industries such as steel structure manufacturing, pressure vessel production, and mechanical processing.

Principle of welding 1. Slag formation and protection During the welding process, HJ431 melts rapidly to form a slag that covers the surface of the welding pool, effectively isolating it from the air and preventing harmful gases such as oxygen and nitrogen in the air from invading the pool. This prevents defects such as oxidation and nitriding in the weld metal, ensuring the metallurgical quality of the weld. 2. Alloy transfer The welding flux contains a certain amount of alloying elements. During welding, these alloying elements are transferred to the weld metal, supplementing the alloy elements and improving the properties of the weld metal. For example, it can improve the mechanical properties such as the strength, hardness, and toughness of the weld, making it meet the usage requirements of different engineering structures and components. 3. Arc stabilization HJ431 enables the arc to burn stably, reducing arc spatter and instability. A stable arc helps control the welding process, ensures the beautiful formation of the weld, and improves the consistency and reliability of the welding quality.

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Particle size：2.5 - 0.45mm (adjustable according to actual needs)
Loose packing density：1.4 - 1.8g/cm³
Melting point：1150 - 1250℃

1. Good welding process performance(Good slag detachability)
2. Reliable welding quality assurance
3. Wide applicability-Applicable to a variety of base metals:
4. Cost-effective

1. Steel structure manufacturing
2. Pressure vessel manufacturing
3. Machinery manufacturing
4. Pipeline welding

1. Ingredient content

SiO₂	MnO	CaF₂	Sulfur	Phosphorus
40-44%	34-38%	3-7%	<0.06%	<0.08%

2.Precautions for Welding with HJ431 Flux:

(1).Pre - welding Preparation

Drying Treatment: The HJ431 flux must be dried before use.

Workpiece Cleaning: Impurities such as oil, rust, and oxide scale on the surface of the workpiece must be thoroughly cleaned.

(2).During Welding

Welding Parameter Control: The welding current, voltage, and welding speed should be reasonably matched. If the current is too high, the penetration will be too large, and the weld metal is likely to overheat, resulting in coarse grains and a decline in mechanical properties. If the current is too low, the penetration will be insufficient, and incomplete penetration may occur. If the voltage is too high, the arc will become longer, the weld width will increase, and defects such as undercut are likely to occur. If the welding speed is too fast, the weld will cool too quickly, and cracks may occur. If it is too slow, the heat input will be too large, affecting the performance of the weld.

Flux Coverage: During the welding process, ensure that the flux can completely cover the welding pool.

Prevention of Slag Inclusion: Pay attention to the operation techniques during welding to avoid the flux being drawn into the weld and forming slag inclusions.

(3).Post - welding Treatment

Weld Slag Cleaning: After welding is completed, promptly clean the weld slag on the surface of the weld.

Quality Inspection: Conduct quality inspections on the weld, including visual inspection and non - destructive testing, etc.

(4).Safety Precautions

Good Ventilation: Harmful gases and fumes are generated during the welding process, so the welding site should be well - ventilated.

Personal Protection: Operators should wear protective equipment such as welding gloves, welding masks, and protective work clothes.

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Submerged Arc Welding Flux HJ431

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