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US 4,396,821 AGranted
Method of spot arc welding
AssigneeSpetsialnoe Proektnokonstruktorskoe I Tekhnologicheskoe Bjuro "Energostalproekt"
InventorsGenrikh N. Strekalov, Anatoly S. Shtyrin, Viktor I. Matveev, Mikhail A. Maryanchik, Genrikh S. Garibov, Valery G. Chumachenko, Fedor I. Sloevsky, deceased
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Abstract
To spot weld overlapping work pieces contact electrodes are used with concave portions. The workpiece is preheated by the contact electrodes then spot arc welded by a consumable wire fed through one of the contact electrodes. The spot arc weldment takes the final shape of the concave portions.
Claims9
A spot arc welding method comprising:
- applying pressure during substantially the entire welding operation on workpieces to be welded in a closed welding zone under a protective atmosphere;
- resistance preheating, by means of contact electrodes having flat contact portions and central concave portions, of the workpieces by passing the electric current therethrough;
- feeding a consumable electrode to said zone through one of said contact electrodes;
- striking an arc between said consumable electrode and said workpieces to form a welded joint between the thus preheated workpieces by fusing metal thereof and continuing such fusing until reinforcements having a shape corresponding to said concave portions form on both sides of said welded joint whereby heat released by said arc is used substantially completely for said fusing and the quality of the resulting weld may be visually inspected.
1 more element
Dependencies are inferred from the claim text.