Method of friction welding of a piston having a cooling duct
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United States of America Patent
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Oct 16, 2012
Issued Date -
N/A
app pub date -
Jan 28, 2011
filing date -
Feb 29, 2008
priority date (Note) -
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Abstract
A method of friction welding a head part to a skirt part of a piston having a hollow cooling duct in which the internal connection surface of the first part to be welded is reciprocally arranged with an internal connection surface of the second part to be friction welded, so that they form a unsymmetrical contact area, so that the resulting weld of the first and the second parts produces a weld bead that is located predominantly outside of the hollow cooling duct. The unsymmetrical contact area can be formed by chamfered, angled edge surfaces that produce, for example, a wedge-shaped space, or partially matched, inter-fitting surfaces that remain out of contact and produce a gap at sides facing the hollow space.
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