When selecting best aluminum welding wire, in addition to considering good welding process performance, the performance requirements of the container and the tensile strength, plasticity (tested through bending) of the welded joint should also be considered. For aluminum-magnesium alloys with magnesium content exceeding 3%, impact toughness requirements should also be met. For containers with corrosion resistance requirements, the corrosion resistance of the welded joint should reach or approach the level of the base material.

Therefore, the selection of best aluminum welding wire mainly considers the following principles:

(1) Pure aluminum welding wire should have a purity generally not lower than that of the base material;

(2) The chemical composition of aluminum welding wire is generally equal to or similar to that of the base material;

(3) The content of corrosion-resistant elements (such as magnesium, manganese, silicon, etc.) in aluminum alloy welding wire used for corrosion resistance is generally not lower than that of the base material;

(4) When welding dissimilar aluminum materials, welding wire should generally be selected according to the base material with higher corrosion resistance and strength;

(5) High-strength aluminum alloys (heat-treated strengthening aluminum alloys) that do not require corrosion resistance can use welding wires with different compositions.

When select best aluminum welding wire, there are other issues that we can pay attention to:

1. Aluminum alloys can be welded using manual MIG welding (metal inert gas welding) and automatic MIG welding as the main welding processes. For the selection of welding wire: a) For materials 6005A, 6082, and 5083, the recommended welding wire grade is 5087/AlMg4.5MnZr. 5087 welding wire not only has good crack resistance and superior porosity resistance, but also has good strength performance.

2. When selecting the specification of the aluminum welding wire, it is preferable to choose a larger diameter.

3. With the same welding fill volume, a welding wire with a larger diameter has a much smaller surface area than a welding wire with a smaller diameter, so the larger diameter welding wire has less surface contamination, i.e. a smaller oxide region, and is easier to achieve the required welding quality.

4. In addition, it is easier to handle the wire feeding process for larger diameter aluminum welding wire.

5. For base materials with a thickness below 8 mm, an aluminum welding wire with a diameter of 1.2 mm is generally used, while for base materials with a thickness of 8 mm and above, a welding wire with a diameter of 1.6 mm is used.

6. Automatic welding machines use welding wire with a diameter of 1.6 mm.