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6XXX Aluminum Welding Solutions

-- Steady & Reliable Manufacturer --

Product Description

The 6XXX aluminum alloys (primarily Al-Mg-Si, like 6061 and 6063) are non-heat-treatable in the weld zone, which dictates the need for specialized filler metals to manage solidification cracking and optimize mechanical properties. Our welding solutions for 6XXX utilize Al-Si fillers (ER4043, ER4047) and specialized Al-Mg-Si fillers (ER4943, ER5356) to ensure crack-free, high-integrity joints. The solution focuses on minimizing localized solidification shrinkage stress during welding, a common challenge with the 6XXX series.

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20+ Years Experience

Over two decades of aluminum alloy wire production expertise

International Certifications

DB, CE, ABS, DNV, CCS and other authoritative certifications

200MT Monthly Capacity

Large-scale production with consistent quality

Global Export

Exporting to over 30 countries worldwide

Introduction

The 6XXX series represents the most popular structural aluminum alloy group globally, used widely in architecture, rail, and general fabrication due to its excellent formability and resistance to atmospheric corrosion. While the base metal is strong, the weld area presents a challenge due to localized softening. We provide a complete range of certified consumables and technical guidance specifically addressing the challenges of 6XXX welding, enabling fabricators to achieve consistent aesthetic appeal and structural performance, whether using low-dilution TIG or high-speed robotic MIG processes.

Specification

Base Metal Focus6061, 6063, 6082, 6005 (Al-Mg-Si)
Primary Filler OptionsER4043 (5% Si), ER4047 (12% Si), ER4943 (High strength, heat-treatable)
Weld Zone PropertyDesigned to bridge the solidification freezing range, mitigating cracking
Color Contrast (ER4043)Weld zone will show a dark grey/black contrast after standard anodizing
Heat Treatment FocusMaterials selected to manage the loss of strength in the heat-affected zone (HAZ)

Applications and Solutions

  • Architectural and Construction: Welding 6063 extrusions for window frames, curtain walls, and decorative structural elements where aesthetics are important.

  • General Fabrication: Joining 6061-T6 plate and tube for walkways, railings, jigs, and fixtures in industrial environments.

  • Automotive and Bicycle Frames: Utilizing heat-treatable fillers (ER4943) to regain strength after post-weld solutionizing and aging of 6061 components.

  • Bus and Rail Frames: Providing crack-resistant fillers for long, continuous welds on 6082 structural profiles.

FAQ

  • Q: Can I use a 5XXX series filler (like ER5356) to weld 6061?A: It is technically possible but discouraged. The weld deposit may experience severe solidification cracking (hot cracking) due to the incompatible chemistry. Only use 5XXX fillers on 6XXX if the joint is highly constrained or if the weld is extremely small.
  • Q: Does the 6061 base metal lose strength after welding?A: Yes. The 6061-T6 base metal relies on precipitate hardening. The heat from welding dissolves these precipitates in the Heat-Affected Zone (HAZ), resulting in a strength reduction to the T4 condition (around 50% of the original T6 strength).
  • Q: What is the purpose of the newer ER4943 filler metal?A: ER4943 is a specialized Al-Si-Mg alloy designed to be a near-perfect match to 6061 and 6063 base metal, offering a weld deposit that is also heat-treatable, allowing the finished component to regain substantial strength after aging (T6).

Advantages and Core Features

  • Excellent Crack Mitigation: High silicon content in 4XXX fillers dramatically lowers the susceptibility to hot tearing during solidification of 6XXX alloys.

  • Versatility Across Base Metals: ER4043 is the most common solution, providing wide compatibility with almost all 6XXX variants, simplifying inventory management.

  • High-Strength Heat-Treatable Option: The specialized ER4943 filler allows fabricators to recover significant strength via post-weld aging treatments, crucial for load-bearing components.

  • Superior Weld Fluidity: Al-Si fillers offer the best flow characteristics, essential for good penetration and for bridging poorly fitted joints common in large assemblies.

Material Selection Guide

For simple, non-structural, or non-anodized 6XXX welds, ER4043 is the standard, reliable, and cost-effective choice. If the component requires full anodizing (and a color match is not critical), or if maximum deposition speed is needed, stay with 4XXX. For high-stress applications where the final assembly will undergo Post-Weld Heat Treatment (PWHT) to achieve maximum strength, ER4943 must be selected to allow the weld metal itself to benefit from the aging process.

About Us

Coming From China, Marketing To The World.

Hangzhou Kunli welding materials Co., Ltd. is China 6XXX Aluminum Welding Solutions Manufacturers and Wholesale 6XXX Aluminum Welding Solutions OEM/ODM Suppliers. We are located in the industrial zone of Puyang Town, Xiaoshan District, Hangzhou, Zhejiang Province. It is a high-technology enterprise specializing in the research, development and manufacturing of high-performance. The company has more than 20 years of aluminum alloy wire production experience, with international advanced manufacturing equipment, complete testing equipment,stable production process and strict quality control system.
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