Electric heating – Metal heating – By arc
Patent
1995-04-12
1997-01-07
Walberg, Teresa J.
Electric heating
Metal heating
By arc
21912178, B23K 2602
Patent
active
055913601
ABSTRACT:
A method of welding using a high energy density radiation beam for butt welding a pair of sheets while minimizing and preferably eliminating edge preparation required before welding and the use of filler metal during welding. In preparation for welding, the sheets are placed with edges facing each other in a butt-joint arrangement. To minimize and preferably eliminate edge preparation, surface mismatch is introduced between the sheets with a portion of the edge of the mismatched sheet being above the weld interface of the sheets and preferably exposed to the beam during welding. To further assist flow of molten metal from the mismatched sheet into the weld interface region, the sheets are preferably angled from the horizontal such that the weld interface plane is acutely angled relative to the direction of gravity so that flow of molten sheet material is influenced by gravity. Preferably, the sheets can also be inclined relative to the horizontal plane such that the weld line between the sheets is at least slightly downwardly sloped in the direction of welding so that the molten weld nugget in the weld interface region is influenced by the direction of gravity for suitably minimizing concavities and other weld defects in the resultant butt weld. If desired, the sheets can be angled both in a direction transverse and tangent to the welding direction. After welding is completed, the sheets preferably form a blank that can be shaped, formed, or otherwise three dimensionally contoured.
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Pelham J.
The Twentyfirst Century Corporation
Walberg Teresa J.
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