METHOD FOR WELDING FIXED TUBE

PURPOSE:To provide a method for welding a fixed tube at high speed and high efficiency. CONSTITUTION:In welding fixed tubes which are butted in a horizontal or inclined position, the welding is started from the top of the circumference of the fixed tubes, and the automatic downward welding is consta...

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Bibliographische Detailangaben
1. Verfasser:	YOSHINO FUMITO
Format:	Patent
Sprache:	eng
Schlagworte:	CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS SOLDERING OR UNSOLDERING TRANSPORTING WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	PURPOSE:To provide a method for welding a fixed tube at high speed and high efficiency. CONSTITUTION:In welding fixed tubes which are butted in a horizontal or inclined position, the welding is started from the top of the circumference of the fixed tubes, and the automatic downward welding is constantly executed. It is preferable from the viewpoint of the welding efficiency to execute the key-hole welding of the first pass with the plasma as the heat source. In the welding, a backing made of Cu or ceramics (which is preferably provided with a clearance slit (0.3-3mm in width) of the plasma jet) can be used. After executing the first pass, the automatic downward welding is constantly executed from the top to the bottom. In the case of the plasma arc welding it is preferable to provide a lap part in the first and second beads. This welding method is especially suitable for the welding of the horizontal fixed tubes of medium to large diameter.