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Name:Aluminum 4043 Alloy (UNS A94043)
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Brief introduction: Aluminum 4043 Alloy (UNS A94043)
Alloy 4043 is one of the oldest and most widely used welding and brazing alloys. AL4043 can be classed as a general purpose type filler alloy.
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What is aluminium 4043 alloy?

Aluminium / aluminum 4043 alloy is a wrought alloy type with good corrosion resistance. The following datasheet will provide more details about aluminium / aluminum 4043 alloy.

Alloy 4043 is one of the oldest and most widely used welding and brazing alloys. AL4043 can be classed as a general purpose type filler alloy. Due to the addition to silicon alloy 4043 results in improved fluidity (wetting action) to make alloy 4043 the preferred choice by welders. Alloy 4043 is less sensitive to weld cracking and brighter and almost smut free welds.



Chemical Composition

The following table shows the chemical composition of aluminium / aluminum 4043 alloy.

Element Content (%)
Aluminum, Al 94.8
Silicon, Si 5.20

Physical Properties

The physical properties of aluminium / aluminum 4043 alloy are outlined in the following table.

Properties Metric Imperial
Density 2.69 g/cm3 0.0972 lb/in3

Mechanical Properties

The mechanical properties of aluminium / aluminum 4043 alloy are tabulated below.

Properties Metric Imperial
Tensile strength 145 MPa 21000 psi
Yield strength (@diameter 12.7 mm/0.500 in) 70 MPa 10200 psi
Poisson’s ratio 0.34 0.34
Elongation at break (@diameter 12.7 mm/0.500 in) 22% 22%
Shear strength 90 MPa 13100 psi
Hardness, Brinell (@load 500 kg; thickness 10.0 mm/1100 lb) 39 39

Other Designations

Equivalent materials to the aluminium / aluminum 4043 alloy are listed below:

  • BS N21
  • MIL-W-6712
  • Alcan GB-33S
  • Duricilium-FD
  • Star-Si-050
  • AWCO-45






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