What is 5052 Aluminum Sheet Welding Performance
As a typical Al-Mg rust-proof aluminum, 5052 aluminum sheet has shown excellent adaptability in the field of ships with its unique composition design (magnesium content 2.2-2.8%, chromium 0.15-0.35%). Its core advantages are:
Resistant to seawater corrosion: magnesium forms a dense oxide film, chromium inhibits intergranular corrosion, and can withstand 6-18 days of rigorous testing in a salt spray environment (5% sodium chloride solution, 35°C).
Lightweight characteristics: The density is only 2.72g/cm³, which is 60% lighter than steel, significantly improving the fuel efficiency of ships.
Medium strength and high toughness: tensile strength 170-305MPa, yield strength ≥65MPa, elastic modulus 69.3-70.7GPa, suitable for medium load scenarios such as hull structure, deck, cabin bulkhead, etc.
Mechanical properties
The mechanical performance of 5052 marine grade aluminium takes into account both rigidity and toughness:
Tensile strength: 170MPa in annealed state (O), 230MPa in cold work hardened state (H34), meeting the strength requirements of hull structural parts.
Fatigue resistance: better than 6061 aluminum alloy, suitable for ship parts that are frequently subjected to wave impact.
Formability: 5052-O aluminum sheet can be processed by deep drawing, bending and other complex processing, 5052-H32/H34 maintains shape stability.
Corrosion resistance
The corrosion resistance of 5052 comes from its alloy composition and microstructure:
Passivation film protection: high magnesium content, Al₂O₃-MgO composite oxide film naturally formed on the surface, and salt spray resistance is better than 3003, 6061 and other alloys.
The role of chromium: inhibits intergranular corrosion, and maintains resistance to stress corrosion cracking (SCC) after welding.
Comparative test: In the salt spray test, the corrosion rate of 5052 is about 0.05mm/year, which is better than 6061's 0.12mm/year and close to 5083's 0.03mm/year.
Application suggestions:
Anodizing or anti-corrosion coating is recommended for long-term exposed parts (such as hull plates).
Insulating gaskets should be used when it is in contact with steel to prevent galvanic corrosion.
Welding properties
5052 aluminum welding performance is good, but the following points should be noted:
Welding method
TIG welding: recommended for thin plates (≤6mm), current 80-150A, argon gas flow 10-15L/min. The welding zone is beautiful weld and small.
MIG welding: suitable for medium and thick plates (≥6mm), current 150-250A, mixed gas (75% Ar+25% He) to increase penetration.
Laser welding: high efficiency and small deformation. It needs to need to control power (2-4kW) and welding speed (2-5m/min).
Welding wire selection
ER5356 (Mg 5%): strong versatility, weld strength close to the base material, excellent corrosion resistance.
ER5183 (Mg 4.5%): suitable for high-stress parts, weld tensile strength can reach 250MPa.
Post-welding treatment
The weld needs to be pickled (10% HNO₃+3% HF) to remove the oxide scale, and then anodized (sulfuric acid concentration 150g/L, voltage 18V) to restore corrosion resistance.
Avoid painting directly on the weld area, it is recommended to apply chromate conversion film first.
Haomei Aluminum offers not only marine grade aluminum sheets, but also aluminum welding wire. Welcome to inquire what you need from us.
Original Source:https://www.marinealu.com/a/what-is-5052-aluminum-sheet-welding-performance.html
Tags: 5052 marine grade aluminium ,
Prev:Aluminum Pipe and Groove for Boat Building
Next:What Is The Role of Aluminum Clad Steel in Shipbuilding