What filler to use on build up on aluminum?

When it comes to repairing aluminum components, using a filler is often necessary to restore the strength and stability of the item.

Selecting the right filler can make a world of difference in terms of performance and durability. In this article, we will discuss what type of filler is best for buildup on aluminum surfaces.

What filler to use on build up on aluminum?

When it comes to repairing build-up on aluminum, choosing the right filler is crucial. Not all fillers are created equal and using the wrong one can lead to a subpar repair job that won’t last.

The selection of right filler to use for aluminum buildup depends on the:

  1. Types of Aluminum grade,
  2. Service requirements,
  3. Availability of filler wire in market.

Related Reading: Aluminum filler metal selection chart

The two most commonly used Aluminum filler wire for build-up on aluminum are:

  1. ER4043
  2. ER5356

    ER4043 Filler wire for Aluminum weld buildup

    ER4043 is a popular choice for welding aluminum alloys. It is an aluminum-silicon base filler wire that offers excellent performance in both TIG and MIG welding applications. The addition of silicon to the alloy provides increased fluidity, making it easier to work with and reducing the likelihood of weld defects.

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    This type of filler wire is especially well-suited for welding 6XXX, 4XXX, and 3XXX series aluminum alloys. These alloys are commonly used in the aerospace, automotive, and marine industries due to their high strength-to-weight ratios and corrosion resistance properties.

    ER5356 Filler wire for Aluminum weld buildup

    ER5356 filler wire is the go-to choice for aluminum weld buildup due to its superior strength and durability.

    This wire is particularly useful when you need to join or repair cast aluminum, as it has excellent fluidity and crack resistance. ER5356 is an alloy that contains magnesium, which provides additional strength and corrosion resistance.

    5356 filler wire is useful for welding 5XXX, 6XXX and 7XXX aluminum alloys.


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