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OEM/ODM ER4047 Aluminum Mig Welding Wire Manufacturers

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ER4047 Aluminum Mig Welding Wire
  • ER4047 Aluminum Mig Welding Wire
  • ER4047 Aluminum Mig Welding Wire
  • ER4047 Aluminum Mig Welding Wire
  • ER4047 Aluminum Mig Welding Wire
Aluminum Welding Wire

ER4047 Aluminum Mig Welding Wire

4047 is a 12% Silicon Aluminum filler metal which has excellent corrosion resistance and low melting point ensuring a very low number of deformations in the parent metal, recommended for welding alloys as 1060, 1350, 3003, 3004, 5052, 6060,6061,6063,etc. and casting Al alloys, such as 710.0,711.0.

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Al-Si12 Eutectic Alloy

ER4047 Aluminum Welding Wire

High Silicon Content | Brazing & Fusion Applications
11-13%
Silicon Range
577-582°C
Eutectic Melt
0.35-0.45 S/cm
Conductivity
ER4047 is a near-eutectic aluminum-silicon filler metal containing 11.0% to 13.0% silicon. This composition provides the lowest melting point among aluminum alloy welding wires, making it suitable for brazing applications and welding of thin-gauge materials. The high silicon concentration produces a fluid weld pool with reduced solidification shrinkage. Silicon also minimizes the formation of brittle intermetallic compounds when joining aluminum to coated steels or dissimilar metals.
Density (solid) 2.65 g/cm³
Electrical Resistivity 46 nΩ·m
Thermal Conductivity 155 W/m·K
Coefficient of Expansion 21.5 µm/m·K
Core Performance Attributes
Eutectic Fluidity
The 11-13% silicon composition produces a narrow freezing range of only 5°C, allowing the weld pool to flow readily into tight gaps and complex joint geometries. This characteristic supports brazing of lapped joints and repair of cast aluminum components.
Hot Crack Mitigation
High silicon content increases the volume fraction of eutectic phase at grain boundaries, accommodating thermal contraction strains during solidification. This reduces cracking susceptibility when welding high-magnesium 5xxx alloys or when dilution levels vary.
Brazing Compatibility
The low liquidus temperature (582°C) enables dip brazing and torch brazing of aluminum assemblies without melting the base material. Joint strength reaches 120-150 MPa in properly configured lap joints.
Porosity Control
Silicon acts as a deoxidizer, reducing hydrogen solubility in the molten weld pool. This results in lower porosity levels compared to pure aluminum fillers, particularly when welding anodized or oxidized surfaces.
TECHNICAL DATA SHEET
Wire Diameters
0.8mm · 1.0mm · 1.2mm · 1.6mm · 2.4mm
Precision ground, ±0.007mm tolerance
Surface Treatment
Shaved + Degreased + Oxide Controlled
Surface oxygen content below 80 ppm
Spooling Configuration
D200 / D300 / K300 / Pay-off drums
Layer wound with traverse pitch 0.85-1.1mm
Conformity Standards
AWS A5.10 (ER4047) · ISO 18273 (S Al 4047A)
CE certified for pressure equipment
⸬

Industrial Application Matrix

HVAC & Refrigeration
Brazed aluminum heat exchangers, condenser coils, evaporator cores, liquid line assemblies
Automotive Heat Transfer
Radiator tanks, heater cores, charge air coolers, oil coolers, battery cooling plates
Electrical Engineering
Bus bar joints, transformer windings, capacitor casings, aluminum to copper transitions
Additive Repair
Restoration of aluminum die castings, repair of porosity in cast components, build-up of worn surfaces
Lightweight Structures
Thin-wall tubing assemblies, honeycomb panel bonding, aerospace non-structural brackets
Power Generation
Generator housing repairs, cooling system components for transformers, bus duct fabrication
Process Optimization Guide
Incomplete fusion in brazed joints
Increase base metal preheat temperature to 250-300°C. Verify that filler metal is applied to the entire joint length. Maintain joint clearance between 0.05mm and 0.15mm for capillary flow action.
Base metal erosion or melting
Reduce torch dwell time and control heat input. For thin materials (below 1.5mm), use lower wire feed speed and travel speed above 40 cm/min. Consider pulsed GTAW parameters with peak current below 140A.
Grey or black residue on weld
Excessive silicon segregation or oxidation. Check shielding gas purity (argon 99.996% minimum). Increase gas flow to 18-22 L/min and verify absence of air drafts near welding zone.
Wire buckling at drive rolls
Switch to U-groove rolls with contact pressure set to lowest effective setting. Use extended Teflon liner with 0.1mm larger internal diameter than wire. Reduce tension on wire spool hub.
Reception & Storage Protocol
  • Inspect packaging integrity upon receipt. Any damage to vacuum seal requires immediate wire inspection or rejection.
  • Store spools in original packaging in areas free from airborne dust, oil mist, or chemical vapors.
  • Maintain storage temperature between 10°C and 35°C. Relative humidity not to exceed 55%.
  • Rotate stock using FIFO method. Maximum shelf life in unopened packaging is 36 months.
Pre-Use Conditioning
  • Allow wire to acclimate to ambient welding temperature for 12 hours before opening the sealed package.
  • For spools stored below 10°C, condition at 20-25°C for 24 hours to eliminate condensation risk.
  • After opening, use wire within 72 hours. Partially used spools may be stored in dry cabinet at 30-40°C.
  • Do not transfer wire between spools as layer winding pattern will be disrupted.
Welding Parameter Baseline
  • GMAW (1.2mm): 18-22V, 100-160A, 100% Argon 18-22 L/min, stickout 15-20mm.
  • GTAW (2.4mm): 80-140A, AC balance 65-75%, 100% Argon 10-15 L/min.
  • Brazing (torch): Neutral flame, flux type FB3-S, base metal temperature 580-610°C.
Alloy chemistry and mechanical data represent typical values. Final properties depend on welding procedure, base material condition, and joint design.

  • DIN EN ISO 18273

    S AL 4047(AlSi 12 (A) )

    Werkstoff-Nr.

    3.2585

    AWS/ASME A 5.10

    ER 4047

    CHEMICAL COMPOSITION（wt）/%

    Si

    Fe

    Cu

    Mn

    Mg

    Cr

    Zn

    Ti

    Zr

    Be

    other

    Al

    single

    total

    11~13

    ≤0.8

    ≤0.3

    ≤0.15

    ≤0.10

    --

    ≤0.2

    ≤0.15

    --

    ≤0.0003

    ≤0.05

    ≤0.15

    Rem.

    TYPICAL CHARACTERISTICS  

    melting range

    1070 - 1080°F

    conductivity

    41%IACS（O）

    density

    2.66g/mm3

    corrosion resistance

    B(Gen) A(SCC)

    coefficient of thermal expansion（20℃~300℃）

    20×10-6/K

    heat conductivity（20℃）

    150~170W/m·K

    The mechanical properties of typical welded joint

    Starting Sheet

    Starting Sheet Performance

    Joint Performance

    Rm (MPa)

    RP0.2 (MPa)

    A/%

    Rm (MPa)

    RP0.2 (MPa)

    A/%

    2014-T6

    480

    410

    13

    230

    190

    4

    6061-T4

    240

    140

    22

    185

    120

    8

    6061-T6

    300

    270

    12

    185

    120

    8

    6063-T4

    170

    150

    22

    135

    70

    12

    Size and Packet 

    Class

    Typical Diameter/mm

    Reference Packet/Kg

    MIG

    0.8、0.9、1.0、1.2、1.6、2.4

    0.5、2、5、6、7、9

    TIG

    1.6、2.0、2.4、3.0、3.2、4.0、5.0/1000

    5、10

    DRUM

    0.8、0.9、1.0、1.2、1.6

    40、80

    COIL

    2.4、3.0、3.2、4.0

    8-15

     

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ER4047 Aluminum Mig Welding Wire

Coming From China，
Marketing To The World.

Hangzhou Kunli welding materials Co., Ltd. is located in the industrial zone of Puyang Town, Xiaoshan District, Hangzhou, Zhejiang Province. It is a high-technology and high-performance China Aluminum Welding Wire Manufacturers and wholesale ER4047 Aluminum Mig Welding Wire factory. The company has more than 20 years of aluminum alloy wire production experience, with international advanced aluminum alloy welding wire manufacturing equipment, complete testing equipment, stable production process and strict quality control system. The high-performance OEM/ODM ER4047 Aluminum Mig Welding Wire produced by the company has successfully passed a number of international authoritative certification, such as DB, CE, ABS, DNV, CCS, etc. We have more than 200MT production capacity per month and 50% was exported to over 30 countries such as USA, Mexico, Southeast Asia, Japan, Korea, Australia, New Zealand and etc.

  • 30+

    USED IN HEAVY INDUSTRY TECHNOLOGY SECTOR

  • 35

    YEARS OF RESEARCH AND DEVELOPMENT EXPERIENCE

  • 200+

    COOPERATIVE LARGE-SCALE R & D INSTITUTIONS

  • 20+

    GLOBAL TRADE COUNTRIES AND REGIONS

Coming From China,
Marketing To The World.

More than 90% of our field operators have professional and technical education background, and have many years of experience in equipment processing and assembly. It is precisely because of this united, dedicated, pioneering, skilled and experienced team that the company's technology and products can be continuously updated and improved.

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Industry Information Extension

Melting Range and Fluidity: Comparing 12% Silicon ER4047 vs. ER4043

The primary mechanical difference between ER4043 and ER4047 lies in their silicon concentration, which fundamentally alters their thermal behavior. Hangzhou Kunli Welding Materials Co., Ltd., a high-technology enterprise with over 20 years of expertise, produces high-performance ER4047 aluminum mig welding wire with a precise 12% Silicon content. This specific formulation is engineered to reach the eutectic point, providing distinct advantages in brazing and specialized welding applications compared to the 5% Silicon found in ER4043.

The Impact of Silicon on Thermal Properties

Silicon acts as a powerful alloying agent that lowers the melting point and increases the fluidity of aluminum. The jump from 5% (ER4043) to 12% (ER4047) silicon results in a shift from a hypoeutectic to a near-eutectic alloy:

  • Narrower Melting Range: ER4047 has a much narrower melting range (approx. 577°C to 582°C) than ER4043. This rapid transition from solid to liquid prevents "mushy" states, allowing for cleaner, faster-solidifying joints that reduce the heat-affected zone (HAZ).
  • Enhanced Fluidity and Wetting: The 12% silicon content significantly reduces surface tension. Hangzhou Kunli Welding Materials Co., Ltd. ensures that its ER4047 wire exhibits superior wetting action, allowing the molten metal to flow effortlessly into tight tolerances and capillary gaps—a critical requirement for leak-tight brazing in HVAC and automotive heat exchangers.
  • Reduced Shrinkage: Higher silicon levels further minimize solidification shrinkage, which, combined with the eutectic cooling profile, provides excellent resistance to hot cracking.

Technical Parameter Comparison: ER4043 vs. ER4047

Parameter ER4043 (AlSi5) ER4047 (AlSi12)
Silicon Content 4.5% - 6.0% 11.0% - 13.0%
Melting Range 573°C - 632°C (Wide) 577°C - 582°C (Narrow/Eutectic)
Fluidity Good Excellent / Superior
Typical Process General Welding Brazing & Precision Sealing
Joint Clearance Suitability Standard V-Grooves Tight Capillary Gaps

Certified Quality and Global Reach

Equipped with internationally advanced manufacturing facilities in Zhejiang, Hangzhou Kunli Welding Materials Co., Ltd. maintains a strict quality control system to ensure consistent silicon distribution. Their wires have successfully replaced imported materials for major clients like China CRRC and Maersk. Holding certifications such as DB, CE, ABS, DNV, and CCS, the company exports over 100 MT monthly to 30+ countries, including the USA, Japan, and New Zealand.

FAQ

  • How does Hangzhou Kunli Welding Materials Co., Ltd. ensure the reliability of ER4047 for export markets?

    Hangzhou Kunli Welding Materials Co., Ltd. utilizes 20 years of experience and advanced testing equipment to ensure every batch meets rigorous international standards. With certifications like DB, CE, and ABS, 50% of the company's products are exported to more than 30 regions, ensuring that customers in the USA, Korea, and Southeast Asia receive welding wire with consistent and reliable performance.

  • What is the benefit of Hangzhou Kunli Welding Materials Co., Ltd.’s cooperation with research institutions?

    By maintaining close ties with the Beijing Nonferrous Metals Research Institute and Central South University, Hangzhou Kunli Welding Materials Co., Ltd. stays at the forefront of aluminum alloy R&D. This collaborative approach has allowed the company to break the reliance on imported high-performance materials, making it a qualified supplier for high-end industrial leaders like China CRRC and Maersk.

  • Can Hangzhou Kunli Welding Materials Co., Ltd. support large-scale industrial demand?

    Yes. Hangzhou Kunli Welding Materials Co., Ltd. has a production capacity exceeding 200 MT per month. This high-volume capability, supported by a stable production process and internationally advanced facilities, allows the company to supply large quantities of aluminum alloy welding wire to major domestic and international representative enterprises across various industries.