Hi I'm looking into the fabrication

[Bill1114]

Hi I'm looking into the fabrication of suspension uprights made from 6082 T6 aluminium welded with 4943 tig rod then heat treating the weldment back to T6. Has anyone experience of this.

 

[GregLocock]

What is the ductility of 6082 T6? Is this for a circuit car or road use?

Cheers

Greg Locock


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[Bill1114]

They will be for a road car, mid engined RWD layout. The use of 6082 has not been popular due to the fact that the recommend tig rod was 4043 which produces a weak haz, but the use of a new tig rod only made buy one American company 4943 can as I have read be heat treated and obtain pre weld strengths. This has been used to great effect on the new James Webb Space Telescope.
6082 spec's :-
Chemical Composition
Spec: BS EN 573-3:2009
Alloy 6082
Chemical Element % Present
Manganese (Mn) 0.40 - 1.00
Iron (Fe) 0.0 - 0.50
Magnesium (Mg) 0.60 - 1.20
Silicon (Si) 0.70 - 1.30
Copper (Cu) 0.0 - 0.10
Zinc (Zn) 0.0 - 0.20
Titanium (Ti) 0.0 - 0.10
Chromium (Cr) 0.0 - 0.25
Other (Each) 0.0 - 0.05
Others (Total) 0.0 - 0.15
Aluminium (Al) Balance
Properties
Physical Property Value
Density 2.70 g/cm³
Melting Point 555 °C
Thermal Expansion 24 x10^-6 /K
Modulus of Elasticity 70 GPa
Thermal Conductivity 180 W/m.K
Electrical Resistivity 0.038 x10^-6 Ω .m
Spec: BS EN 485-2:2008
Plate - 6.00m to 12.5mm
Mechanical Property Value
Proof Stress 255 Min MPa
Tensile Strength 300 Min MPa
Elongation A50 mm 9 Min %
Hardness Brinell 91 HB
Spec: BS EN 485-2:2008
Plate - 12.5mm to 100.00mm
Mechanical Property Value
Proof Stress 240 Min MPa
Tensile Strength 295 Min MPa
Hardness Brinell 89 HB
Spec: BS EN 485-2:2008
Plate - 100.00mm to 150.00mm
Mechanical Property Value
Proof Stress 240 Min MPa
Tensile Strength 275 Min MPa
Hardness Brinell 84 HB
Elongation A 6 Min %
Alloy Designations
Aluminium alloy 6082 also corresponds to the following standard designations and specifications but may not be a direct equivalent:

AA6082

HE30

DIN 3.2315

EN AW-6082

ISO: Al Si1MgMn

A96082

Temper Types
The most common tempers for 6082 aluminium are:

T6 - Solution heat treated and artificially aged
O - Soft
T4 - Solution heat treated and naturally aged to a substantially stable condition
T651 - Solution heat treated, stress relieved by stretching then artificially aged
Supplied Forms
Alloy 6082 T6 & T651 is typically supplied as Plate and Shate.

Plate
Sheet
Weldability
6082 has very good weldability but strength is lowered in the weld zone. When welded to itself, alloy 4043 wire is recommended. If welding 6082 to 7005, then the wire used should be alloy 5356.



Weldability – Gas: Good

Weldability – Arc: Good

Weldability – Resistance: Good

Brazability: Good

Solderability: Good

Fabrication
Workability - Cold: Good

Machinability: Good

 

[Bill1114]

Details of 4943 tig rod
Description
Alloy 4943 filler metal was formulated to be welded with the same weld procedure specifications as 4043 and 4643, and does not depend upon dilution from the base metal during welding to increase the strength of the weld deposit, while maintaining the same weld characteristics and benefits of 4043 and 4643. Features/Benefits: - 25% higher UTS & 50% higher yield strength than 4043 in the as welded condition (typical) - Moderate/high strength (35 ksi typical) - Low melting temperature/high fluidity - Low welding smut and discoloration - Low ductility, formability, and lower toughness (similar to 4043) - Moderate electrical conductivity and thermal conductivity - Post weld fully heat treatable requiring no base metal dilution - Excellent corrosion resistance - Low shrinkage rate/reduced distortion - Low hot cracking sensitivity in most applications

 

[GregLocock]

9% ductility is too fragile for road cars, your suspension will break rather than bend. You want at least 12%.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

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[Bill1114]

Hi if we change from aluminium to a steel completely boxed upright what would be the best grade to start our design with?

 

[GregLocock]

4130 would be my choice. Strong, ductile, weldable without too much faff.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

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