4043 aluminum block

May 30, 2023

4043 aluminum block has the characteristics of low melting point, good fluidity and good corrosion resistance, which is very beneficial to avoid welding cracks, and is specially used as welding material.
Features and applications:

4000 series aluminum alloys (Al-Si series) are typically represented by 4043 and 4343 aluminum alloys, which are specially used as welding materials. 4043 aluminum block has the characteristics of low melting point, good fluidity and good corrosion resistance, which is very beneficial to avoid welding cracks. 4343 aluminum block has higher Si content than 4043 aluminum block, and has the characteristics of low melting point, narrow solidification range, good fluidity, etc., which is beneficial to the shrinkage of the welding seam during solidification and reduces cracks. It is used as a cladding layer for composite brazing plates.

Standard comparison: American Aluminum Association (AA) 4043, UNS A94043, ISO R209 AlSi5; China GB 4A01 (LT1); Japan JIS A4043; Canada CSA S5; France NF A-S5; UK BS 4043A (N21); Russia ГOCT ( AK); International ISO 4043 (AlSi5); German DIN AlSi5
Chemical composition:

Aluminum Al (minimum): Allowance
Silicon Si: 4.5~6.0
Iron Fe: ≤0.8
Copper Cu: ≤0.30
Manganese Mn: ≤0.05
Magnesium Mg: ≤0.05
Zinc Zn: ≤0.10
Other elements specified:
Titanium Ti: ≤0.20
Other elements not specified: each: ≤0.05; total: ≤0.15