Method for producing an aluminum piston
AssigneeMahle International GmbH
InventorsKarlheinz Bing, Thomas Hackh, Frank Schnaiter
Life of this patent
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Abstract
A method for producing an aluminum piston for an internal combustion engine may including providing a piston bowl having a bowl edge and a bowl base; subjecting an area of at least one of the bowl edge and the bowl base to a welding treatment to introduce at least one additional element into a base material of the piston bowl and to produce intermetallic phases in the base material; the welding treatment may introduce at least one of the following additional elements at the specified concentrations, 1-7 wt. percentage of Ni, 1-15 wt. percentage of Cu and 1-5 wt. percentage of Fe.
Claims20
A method for producing an aluminium piston for an internal combustion engine, comprising:
- providing a piston bowl having a bowl edge and a bowl base, subjecting an area of at least one of the bowl edge and the bowl base to a welding treatment to introduce at least one additional element into a base material of the piston bowl and to produce intermetallic phases in the base material, wherein the welding treatment introduces at least one of the following additional elements at the specified concentration, 1-7 wt. percentage of Ni, 1-15 wt. percentage of Cu and 1-5 wt. percentage of Fe.
An aluminium piston for an internal combustion engine, comprising:
- a piston bowl composed of a base material, the bowl having a bowl edge and a bowl base, wherein at least one of the bowl edge and the bowl base includes an intermetallic phase having a longitudinal extension of less than 50 microns, the intermetallic phase including at least one of the following elements at the specified concentrations:
- 1-7 percentage by weight of Ni, 1-15 percentage by weight of Cu, and 1-5 percentage by weight of Fe.
A method for producing a piston for an internal combustion engine, comprising:
- forming a piston bowl having a bowl edge and a bowl base from a base material, the base material including, with the following compositions:
- 75 to 85 percentage by weight of Al, 10 to 13 percentage by weight of Si, 3.5 to 5 percentage by weight of Cu, 1.5 to 2.5 percentage by weight of Ni, and 0.5 to 1.5 percentage by weight of Mg;
- and
- introducing at least one additional element into the base material via welding to produce intermetallic phases having a longitudinal extension of less than 50 microns, the at least one additional element including at least one of the following:
- 2 to 7 percentage by weight of Ni, 3 to 15 percentage by weight of Cu and 1 to 5 percentage by weight of Fe;
- wherein the welding includes at least one of the following with the specified ratio of arc energy/weld penetration area ratio (E/A):
- tungsten inert gas welding with an E/A of 7 to 17 J/mm3, plasma welding with an E/A of 6 to 16 J/mm3, laser beam welding with an E/A of 80 to 90 J/mm3, and electron beam welding with an E/A of 5 to 15 J/mm3.
Dependencies are inferred from the claim text.