The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 09, 2004
Filed:
Jul. 10, 2002
Klaus Gisbert Schmitt, Giessen, DE;
Michael Krengel, Giessen, DE;
Newfrey LLC, Newark, DE (US);
Abstract
The invention relates to a multiple stage method for arc-welding a bolt ( ) to a metal structure ( ), said bolt ( ) having a flange ( ) at the end that is to be welded on. The actual welding process is preceded by a cleaning method that is carried out by means of an arc. Said cleaning method consists of two or more stages. It is crucial to control the arc and the distance between the bolt ( ) and the structure surface ( ) in such a way that only cleaning takes place, without causing premature welding. While during the first cleaning state, only a small surface is cleaned intensively, in the second stage, a larger surface is cleaned due to a greater distance between the bolt ( ) and the structure surface ( ). Separation through interruption of the arc and maintenance of the bolt ( ) in a stationary position at a distance from the structure surface ( ) must take place between the first and second cleaning stages. The second cleaning stage can lead into the actual welding process continuously however, without interrupting the arc, the bolt ( ) then being permanently connected to the structure ( ). The invention method is particularly suitable for welding bolts to aluminum structures, even where a surface coating is present, e.g. an oxide and/or a zinc layer and/or an oil film and/or a wax layer.