Aluminum alloy has good corrosion resistance, high specific strength and thermal conductivity, and can maintain good mechanical properties at low temperatures. It is widely used in aerospace, automotive, electrical, chemical, transportation, national defense and other industrial sectors .
To master the weldability characteristics of aluminum alloy, welding operation technology and defect preventive measures, etc., is very important for correctly formulating aluminum alloy welding process, obtaining good joint performance and expanding the application range of aluminum alloys.
1. Aluminum and oxygen have a great affinity, so there is always a layer of refractory aluminum oxide film on the surface of aluminum that far exceeds the melting point of aluminum. This oxide film is insoluble in metal. The oxide film should be removed or destroyed during welding or brazing.
2. During fusion welding, the weldability of aluminum alloy is first reflected in the crack resistance. Adding copper, manganese, silicon, magnesium, zinc and other alloying elements to aluminum can obtain alloys with different properties. Various alloying elements have different effects on aluminum alloy welding cracks.
3. The solid and liquid colors of aluminum alloys are not easy to distinguish, and it is difficult to control the temperature of the molten pool during welding.
4. After welding, the weld is prone to porosity, and the welded joint area is prone to softening
Welding method | Welding performance and Applicable thickness | ||||
Al-Mn 3xxx | Al-Mg 5xxx | Applicable Thickness | |||
3004 aluminum | 5083 5086 | 5052 5454 | Best scope | Available | |
TIG | Excellent | Excellent | Excellent | 1-10 | 0.9-25 |
MIG | Excellent | Excellent | Excellent | >8 | >4 |
Pulse MIG welding | Excellent | Excellent | Excellent | >2 | 1.6-8 |
Gas welding | Excellent | Very poor | Relatively poor | 0.5-10 | 0.3-25 |
Electrode arc welding | Good | Very poor | Relatively poor | 3-8 | - |
Resistance welding | Good |
Excellent | Excellent | 0.7-3 | 0.1-4 |
Plasma arc welding | Excellent | Excellent | Excellent | 1-10 | - |
Electron beam welding | Excellent | Excellent | Excellent | 3-75 | >3 |
Haomei Aluminum has different aluminum alloys like the popular 5083 aluminum plate, 5052 aluminum sheet, 3003 aluminum plate, 5086 aluminum alloy. Welcome to leave message below to inquire what you need.