As a leading supplier, Chengdu Shushengtai Steel Co., Ltd. provides high-quality Galvanized Steel Pipes and offers guidance on optimizing the welding process to ensure structural integrity and corrosion protection. Proper welding techniques are critical due to the zinc coating, which requires special handling compared to ordinary low-carbon steel.
Key Considerations for Welding Galvanized Steel Pipes:
① Pre-Welding Preparation
Before welding, the preparation process is similar to that of low-carbon steel, but attention must be given to groove dimensions and adjacent galvanized surfaces. Typical groove angles are 60–65°, with a gap of 1.5–2.5 mm. To prevent zinc contamination in the weld, it is recommended to remove the zinc coating from the groove area prior to welding.
② Welding Method and Groove Control
Concentrated beveling and no-blunt-edge control help achieve consistent weld penetration. A double-layer welding technique is preferred to reduce the risk of incomplete fusion and ensure uniform strength across the weld seam.
③ Electrode Selection
Electrode choice depends on the base material. For low-carbon steel pipes, commonly used welding rods offer excellent operability and compatibility with galvanized surfaces.
④ Managing Zinc During Welding
During multi-pass welding, it is important to allow the zinc layer to melt and evaporate, reducing its retention in the weld seam. For fillet welding, moving the electrode forward 5–7 mm as the zinc melts, then returning to the initial position, helps release vaporized zinc effectively, resulting in a clean, defect-free weld.
⑤ Advanced Techniques for High-Quality Welds
Using short-arc welding rods for cross and vertical welding minimizes edge burning. Additionally, employing forward-and-back steel feeding techniques ensures consistent weld penetration and reduces the likelihood of defects.
By following these best practices, Chengdu Shushengtai Steel Co., Ltd. guarantees that its Galvanized Steel Pipes maintain both mechanical strength and long-term corrosion resistance, providing reliable performance for construction, plumbing, and industrial applications.