Stainless Welding Wire

1. Excellent corrosion resistance

• Intergranular corrosion resistance: High-Performance ER309LSi Welding Wire is an ultra-low carbon stainless steel welding wire with low carbon content, which can effectively avoid intergranular corrosion and is suitable for industries with high corrosion resistance requirements such as chemical industry and food processing.

• Heat and corrosion resistance: This welding wire can still maintain good corrosion resistance in high temperature environment, and is suitable for high temperature environments such as power station construction and petrochemical equipment.

2. Good welding processability

• Arc stability:High-Performance ER309LSi Stainless Steel Welding Wire has stable arc, less spatter, beautiful weld formation during welding, and is suitable for all-position welding.

• Good deposited metal fluidity:Due to the addition of silicon element, the deposited metal of the welding wire has good fluidity, smooth weld surface, and good weld pool control.

3. Excellent mechanical properties

• High strength and toughness:The weld metal has high tensile strength and good elongation, ensuring the long-term stability and safety of the welded structure.

• Crack resistance:The weld metal contains an appropriate amount of ferrite, with low crack sensitivity, and is suitable for welding martensitic and ferritic stainless steels with poor toughness.

4. Wide range of applications

• Welding of dissimilar materials: ER309LSi is suitable for welding dissimilar materials such as carbon steel and stainless steel, such as railway freight car bodies, TCS materials for transport trucks, or welding of dissimilar steels such as stainless steel and low carbon steel.

• Various industrial fields: widely used in petrochemical equipment, pressure vessels, food machinery, shipbuilding and other industries.

1.ER309LSi welding wire contains a higher silicon (Si) content, usually between 0.65% and 1.00%, which makes it have better fluidity during welding,more beautiful weld formation, stable arc and less spatter.

2.Contains higher chromium (Cr) and nickel (Ni) content, usually 22%Cr-12%Ni, which makes it excellent in corrosion resistance and high temperature strength.

3.With good fluidity and stable arc characteristics, it has good welding formation and less spatter.

Application

 

 

 Industrial equipment manufacturing 

1. Petrochemical equipment: ER309LSi stainless steel welding wire is widely used in the manufacture and maintenance of petrochemical equipment, such as reaction vessels, heat exchangers, pipelines, etc. These equipment usually work in high temperature, high pressure, and corrosive environments, and require welding materials with excellent corrosion resistance and mechanical properties.
2. Pressure vessels: used for the manufacture and maintenance of pressure vessels, such as storage tanks, boilers, gas cylinders, etc. These containers are usually subjected to high pressure and temperature and need to have good crack resistance and corrosion resistance.
3. Synthetic fiber equipment: In the manufacture of synthetic fiber equipment, ER309LSi stainless steel welding wire is used to weld the transition metal layer of the inner wall of the reaction vessel and the internal components of the tower. These equipment work in a corrosive environment and require welding materials with excellent corrosion resistance.

Energy field

1. Power station construction: In power station construction, ER309LSi stainless welding wire is used to weld various stainless steel structures, such as turbine blades, generator stators, etc. These parts work under high temperature and high pressure environment and need to have good heat resistance and corrosion resistance.
2. Nuclear power plant: ER309LSi stainless steel welding wire is also used in the construction of nuclear power plants, such as the manufacture and maintenance of nuclear reactors. These equipments have extremely high requirements for the corrosion resistance and safety of materials, and ER309LSi welding wire can meet these requirements.

3.Offshore wind power: As an important part of the new energy field, offshore wind power has extremely high requirements for the corrosion resistance and heat resistance of materials. ER309LSi welding wire is widely used in the welding of offshore wind power towers, foundation structures, cable sheaths and other components due to its excellent corrosion resistance and good heat resistance.

Transportation field

1. Railway locomotives and freight cars: ER309LSi welding wire can be used for welding atmospheric corrosion resistant materials such as railway locomotives and freight car bodies, such as TCS materials for freight cars or welding of dissimilar steels such as stainless steel and low carbon steel. These applications require good welding processability and corrosion resistance.
2. High-speed trains: Especially suitable for welding of high-speed trains, such as the manufacture of stainless steel carriages. These applications require good welding processability and corrosion resistance to ensure the long-term stable operation of trains.
3. Container manufacturing: High-performance ER309LSi stainless steel welding wire is also widely used in the manufacture of stainless steel containers. These containers need to have excellent corrosion resistance and good welding processability to adapt to complex working conditions such as marine environmental corrosion and climate change during transportation.

During welding, the welding wire is connected to the negative pole of the power source, and the workpiece is connected to the positive pole of the power source, that is, the DC reverse connection method is adopted. This connection method can provide a higher deposition rate and good arc stability, and is suitable for the welding operation of ER309LSi welding wire.

1. Pay attention to temperature and humidity. It is recommended that the indoor temperature be above 5°C and the relative humidity not exceed 60%. Keep a certain distance from the ground and walls (about 30cm).

2. Use 100% argon or Ar+ (1%~3%) O2 as the protective gas, and the protective gas flow rate is 20-25L/min.

ER309LSi welding wire

ER309LSi welding wire made in China

Preparation before welding

• Cleaning the welding area: Before welding, the surface impurities such as oil, rust, and moisture at the welding site must be thoroughly removed. You can use appropriate cleaning agents or mechanical methods to clean it to ensure that the groove surface and the surrounding area are ground with a metallic luster to prevent pores and cracks during welding.
• Wire preparation: Before welding, the oil, dirt, rust and other dirt on the surface of the wire should be removed to ensure the cleanliness of the wire to ensure the welding quality.

Welding parameter setting

• Shielding gas: When TIG welding, it is recommended to use pure argon as the shielding gas, the purity should be above 99.99%, and the shielding gas flow rate should be 8-15L/min.
• Tungsten electrode extension length and arc length: The tungsten electrode extension length is about 3-5mm, and the arc length is controlled at 1-3mm to ensure the stability of the arc and the welding quality.
• Welding current and voltage: Select the appropriate welding current and voltage according to the wire diameter and welding position. For example, when using Φ1.6mm welding wire, the welding current is generally between 50-100A and the welding voltage is between 14-18V.
• Welding speed: The welding speed should be determined according to the size and thickness of the welded parts, and generally maintained at a moderate speed to ensure the formation and quality of the weld.

Welding operation skills

• Arc striking: When striking the arc, the arc striking point should be kept clean, and appropriate arc striking methods, such as scratching or touch method, should be used to ensure the stable ignition of the arc.
• Rod movement: During welding, the movement of the welding rod should be uniform and stable, and the appropriate welding speed and arc length should be maintained to ensure the uniformity and formation of the weld.
• Control heat input: During welding, the welding line energy should be strictly controlled to avoid excessive heat input that causes the mechanical properties of the weld metal to deteriorate or cracks to form.

Precautions

• Wind speed limit: When the wind speed is greater than 1.5m/s, windproof measures should be taken to prevent moisture and impurities in the air from entering the welding area and affecting the welding quality.
• Back protection: It is recommended to pass argon gas protection on the back of the welding area to prevent oxidation and contamination and improve the protection effect of the weld.
• Preheating and interpass temperature: According to the material and thickness of the parent material, the preheating and interpass temperature should be properly controlled to prevent cracks and other defects during welding.

Preparation before welding

• Cleaning the welding area: Before welding, the surface impurities such as oil, rust, and moisture at the welding point must be thoroughly removed to prevent pores and cracks during welding. You can use appropriate cleaning agents or mechanical methods to clean it to ensure that the groove surface and the surrounding area are polished with metallic luster.
• Wire preparation: Before welding, the oil, dirt, rust and other dirt on the surface of the welding wire should be removed to ensure the cleanliness of the welding wire.

Welding parameter setting

• Shielding gas: Ar+1-3%O₂ is recommended for MIG welding, and the shielding gas flow rate is preferably 20-25L/min.
• Wire diameter and current:

⇒Φ0.8mm: welding current 70-150A

⇒Φ1.0mm: welding current 100-200A

⇒Φ1.2mm: welding current 140-220A.

• Voltage: Select the appropriate voltage according to the wire diameter and welding position. Generally, the voltage is 14-18V for Φ0.8mm, and 26-32V for Φ1.0mm and Φ1.2mm.
• Dry extension length: It is recommended to keep it at 15-25mm.

Welding operation skills

• Arc striking: When striking the arc, ensure that the arc striking point is clean, and use appropriate arc striking methods, such as scratching or touch method, to ensure stable ignition of the arc.
• Wire feeding: During welding, the feeding speed of the welding wire should be coordinated with the welding speed, and the appropriate welding speed and arc length should be maintained to ensure the uniformity and forming of the weld.
• Control heat input: During welding, the welding line energy should be strictly controlled to avoid excessive heat input that leads to a decrease in the mechanical properties of the weld metal or cracks.

Precautions

• Wind speed limit: When welding outdoors, when the wind speed is greater than 1.5m/s, windproof measures should be taken to prevent pores.
• Back protection: It is recommended to pass argon gas protection on the back of the welding area to prevent oxidation and pollution and improve the protection effect of the weld.
• Preheating and interpass temperature: According to the material and thickness of the parent material, the preheating and interpass temperature should be properly controlled to prevent cracks and other defects during welding.
• Welding quality inspection: After welding is completed, necessary quality inspections should be carried out, such as appearance inspection, non-destructive testing, etc., to ensure the quality and performance of the weld.