4xxx Series
Aluminum-Silicon Alloys
Overview
Low melting point, good flow characteristics, welding filler
Applications
Common Alloys
Properties
Manufacturing Process
Step 1
Material Preparation
Aluminium ingots and silicon (4–14 %) plus minor alloying elements are weighed and charged into the furnace.
Step 2
Melting & Alloying
Silicon dissolves into the melt at 650–720 °C, lowering the liquidus to 577–600 °C range and improving fluidity.
Step 3
Continuous Casting
Melt is continuously cast or DC cast into rod or slab form; rapid solidification refines the Si eutectic structure.
Step 4
Extrusion / Rolling
Cast billets are extruded or hot-rolled at 350–450 °C using precision tooling to achieve the required rod or wire blank diameter.
Step 5
Wire Drawing
Multiple cold-drawing passes through tungsten-carbide dies progressively reduce the diameter to final welding wire or brazing rod size.
Step 6
Inspection & Packaging
Chemical composition verified by OES; tensile and bend tests performed. Wire spooled or rods cut to length and labelled.
Step 1
Material Preparation
Aluminium ingots and silicon (4–14 %) plus minor alloying elements are weighed and charged into the furnace.
Step 2
Melting & Alloying
Silicon dissolves into the melt at 650–720 °C, lowering the liquidus to 577–600 °C range and improving fluidity.
Step 3
Continuous Casting
Melt is continuously cast or DC cast into rod or slab form; rapid solidification refines the Si eutectic structure.
Step 4
Extrusion / Rolling
Cast billets are extruded or hot-rolled at 350–450 °C using precision tooling to achieve the required rod or wire blank diameter.
Step 5
Wire Drawing
Multiple cold-drawing passes through tungsten-carbide dies progressively reduce the diameter to final welding wire or brazing rod size.
Step 6
Inspection & Packaging
Chemical composition verified by OES; tensile and bend tests performed. Wire spooled or rods cut to length and labelled.
Chemical Composition
EN 573-3 / AA
Max % unless range shown. Balance: Al.
| Alloy | Chem. Symbol | Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti |
|---|---|---|---|---|---|---|---|---|---|
| 4032 | AlSi12.5MgCuNi | 11.0–13.5 | 1.0 | 0.50–1.3 | — | 0.8–1.3 | — | 0.25 | — |
| 4043 | AlSi5 | 4.5–6.0 | 0.80 | 0.30 | 0.05 | 0.05 | — | 0.10 | 0.20 |
| 4047 | AlSi12 | 11.0–13.0 | 0.80 | 0.30 | 0.15 | 0.10 | — | 0.20 | — |