Aluminum Welding for Energy & Storage Equipment

Common base metals and welds

Aluminum structures in energy and storage equipment are largely welded from large plates and extrusions, demanding both joint strength and long-term corrosion resistance; in addition, some tanks must serve long-term at elevated temperature, which places extra demands on filler selection. The base metals and service conditions most commonly encountered are as follows:

• 5xxx-series plate (e.g. 5083, 5052): widely used for storage enclosures, tank bodies and load-bearing parts — good strength retention after welding and excellent corrosion resistance, the most common base metal for such structures.
• 6xxx-series extrusions (e.g. 6061, 6082): used for frames, supports and structural members — adequate strength, heat-treatable, and often combined with 5xxx plate to form the overall structure.
• Tanks in elevated-temperature service: 5xxx aluminum alloys with higher magnesium content (above about 3% Mg) are prone to sensitization in continuous service above roughly 65°C, which can lead to stress-corrosion cracking (SCC). For such hot-service conditions, 5454 base metal with ER5554 filler is preferred, avoiding the sensitization and SCC risk of high-magnesium welds.
• These structures have long seams, thick sections and multi-pass joints, with pronounced heat input and distortion build-up, so the wire's payoff smoothness, feeding stability and batch-to-batch consistency are especially critical — stable feeding directly affects production continuity and weld quality.

Practical welding notes

• Distortion and weld-sequence control: large enclosures and tanks have long seams and thick sections, and thermal distortion accumulates readily. Plan the welding sequence sensibly, apply symmetrical and back-step welding, control heat input and interpass temperature, and use rigid fixturing to maintain structural straightness and assembly dimensions.
• For hot service, choose 5454/5554: for tanks in continuous service above roughly 65°C, avoid high-magnesium 5xxx welds; adopt 5454 base metal with ER5554 filler to eliminate sensitization and stress-corrosion cracking (SCC) risk at the material level.
• Corrosion resistance and proper cleaning: before welding, thoroughly remove the oxide film, oil and moisture, and shield with pure argon or an argon-helium mixture to reduce porosity and improve weld density and corrosion resistance; clean off spatter and residue promptly after welding to support corrosion performance over the service life.
• Smooth feeding, stable payoff: TGM wire has a clean surface and uniform diameter, giving low feed resistance and a stable arc; layer-wound for smooth payoff without knotting or jumping, it suits continuous welding of long seams from large spools, with stable de-reeling and fewer stoppages in high-volume repeat welding.