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5356 Aluminum Welding Wire

5356 Aluminum Welding Wire

Should I use 4043 or 5356 filler alloy? As a basic description we can say that 4043 is an aluminum filler alloy with 5% silicon added and that 5356 is an aluminum filler alloy with 5% magnesium added. There are some misconceptions within the industry that you can successfully weld any aluminum...

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Should I use 4043 or 5356 filler alloy?

As a basic description we can say that 4043 is an aluminum filler alloy with 5% silicon added and that 5356 is an aluminum filler alloy with 5% magnesium added.

There are some misconceptions within the industry that you can successfully weld any aluminum base alloy with either 4043 or 5356 filler alloy. I must start by saying that this is not the case. However, there are many common structural aluminum base alloys that can be welded with either 4043 or 5356. One such alloy is 6061.

The question here is when should we choose one of these filler alloys over the other?

When the filler alloy selection chart allows the use of either 4043 or 5356 as filler for a specific base alloy, as a guide, we may wish to consider the following facts about each of these filler alloys.


  • 4043 should not be used if you are considering the best color match after post weld anodizing, as this filler alloy will typically turn dark gray in color after the anodizing process. 5356 will provide a much closer color match after anodizing.

  • 4043 is suitable for service temperatures above 150 Deg. F, however, 5356, because of its 5% magnesium content is not suitable for these elevated temperature applications.


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